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Panasonic U-72MF1U9E Service Manual

1. System diagram Outdoor unit maintenance remote controller Special service checker wiring Outdoor unit Kee nter unit control wiring Servicing No CV6231785082 Outdoor unit control PCB ED Remote controller Ass y L an a im Eder X Operation manual included in package Remote Remote controller controller amp The special service checker wiring is required in order to connect the outdoor unit maintenance remote controller to the outdoor unit PCB amp Ordinary remote controllers or other controller are still required for the indoor units even when the outdoor unit maintenance remote controller is connected 3 WAY VRF SYSTEM 2 Functions Outdoor Unit Maintenance Remote Controller M Functions on the ordinary display 1 Functions Button operations can be used to perform the following functions e Start stop of all indoor units e Switching between cooling and heating e Test run of all indoor units e Double speed operation of indoor units Do not use for actual operation Doing so may damage the devices 2 Display The following can be displayed e Alarm details display e No of indoor outdoor units e Unit Nos of connected indoor outdoor units e Indoor outdoor unit operating status blinks when an alarm occurs e Indoor unit thermostat ON e Di
2. 3 WAY VRF SYSTEM 8 Charging Compressor Oil Outdoor Unit Repair Procedures Next follow the instructions in 5 2 1 Cooling operation for all units at the outdoor unit where oil will be charged and start cooling operation at all units When the operating conditions have stabilized perform steps 1 2 and 3 in sequence and open the valves When this is done the refrigerant pressure from operation forces the oil out of the oil charge tank and oil is charged into the outdoor unit from the low pressure outlet port From time to time close the upper valve on the top of the oil charge tank only this valve and shake the tank to check the amount of remaining oil L o j 4 p i High pressure outlet port Nag For 5 16 7 94mm dia VW connector DPR p Sa T i L m a WZ o N V Set i rn Ta Z E a S GC kl l Sai 7 i Ne j D E S IA psi ga Mn bena H SEN LJ Fj Tr gt APER SES De e Ge L i pelt at aa OR LS HE Bea pa ro ve Kr CH OH H D den Low pressure Manifold gauge Hev Lo Hi d 7 94mm dia Dec connector Procedure 1 Q Open the Hi side e manifold gauge valve alle n Lower valve st si EES Procedure 3 Open Suction tube service port Connect from he
3. 1 2 Prevent impurities including water dust and oxide from entering the tubing Impurities can cause R410A refrigerant deterioration and compressor defects Due to the features of the refrigerant and refrigerating machine oil the prevention of water and other impurities becomes more important than ever 2 Be sure to recharge the refrigerant only in liquid form 2 1 Since R410A is a non azeotrope recharging the refrigerant in gas form can lower performance and cause defects in the unit 2 2 Since refrigerant composition changes and performa nce decreases when gas leaks collect the remaining refrigerant and recharge the required total amount of new refrigerant after fixing the leak 3 Different tools required 3 1 Tool specifications have been changed due to the characteristics of R410A Some tools for R22 and R407C type refrigerant systems cannot be used D R407C tools Manifold gauge Item tool compatible Remarks with R410A Manifold gauge Yes No Types of refrigerant refrigerating machine oil and pressure gauge are different Charge hose Yes No To resist higher pressure material must be changed Vacuum pump Yes Yes Use a conventional vacuum pump if it is equipped with a check valve If it has no check valve purchase and attach a vacuum pump adapter Leak detector Yes No Leak detectors for CFC and HCFC that react to chlorine do not function because Vacuum pump R410A contains no chlori
4. Check Continued 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis 3 Leakage from the discharge tube check valve Trouble Although the other compressor is operating and this compressor is stopped the discharge temperature of this compressor rises together with the temperature of the other compressor 4 The ambient temperature around the outdoor unit when it is stopped is 109 F or higher 5 If the cause is still unknown after checking the above then it is possible that electrical noise is the cause of the trouble It is necessary to provide a line filter or carry out other noise countermeasures Correction 1 Replace the sensor 2 Replace the outdoor unit PCB 3 Carry out noise countermeasures 4 Repair the refrigerant tubing 5 Adjust the amount of refrigerant 6 Correct the trouble 1 Sensor wiring is partially cut Notes This alarm does not indicate that the sensor is disconnected In order to prevent overheating during operation the outdoor units in this system will not allow a compressor to start if the discharge temperature does not decrease while the compressor is stopped If a sensor malfunction results in continuous detection of a high discharge temperature then the compressor may stop for no apparent reason The purpose of this alarm is to facilitate identification of the problem in this case F06 F23 Alarm Alarm code pose O Alarm meaning Gas temperature sensor trouble a
5. Display of unit Nos 1 2 and 3 We Gs Display of unit Nos 1 2 3 and 4 The colon display Unit Nos 1 20 21 40 changes automatically every 10 seconds The display does not change if higher unit numbers do not exist Pressing the button switches the display immediately to the next higher level even if 10 seconds have not passed E The total compressor operating time is displayed in 1 hour units using 8 digits e When the first 4 digits are displayed the bottom dot of the colon is lit Figure A e When the last 4 digits are displayed the colon points are not lit Figure B e The display of the first 4 and last 4 digits changes automatically every 10 seconds It can also be changed by pressing the button 10 lt Total compressor operating time gt NOTE A and B are displayed alternately The example here 0000 0062 indicates 62 hours With the outdoor unit maintenance remote controller when connected to the outdoor unit the unit remote controller check functions will not operate 3 8 4 Monitoring Operations Display the indoor unit and outdoor unit sensor temperatures lt Operating procedure gt Press and hold the CHECK button and buttons simultaneously for 4 seconds or longer to switch to temperature monitor mode Durin
6. A OI kammer ai er t Wi Ge ke Ka TGN S GR e art fr A8 A 3 X T EN Leen Ha E Le d k NM I d e 3 WAY VRF SYSTEM 3 Discharging Compressor Oil Outdoor Unit Repair Procedures Discharged oil can be used for checking the condition of the system Based on the appearance and color of the discharged oil a judgment can be made on whether the system is operating normally or not 3 1 Discharging Oil from Oil Separator Recover the refrigerant from the outdoor unit following the procedure given in 5 Recovering Refrigerant Install hoses as indicated on the equipment and feed nitrogen gas gradually to provide pressure to the system from the low pressure outlet and collect oil in a pan or container Fig 2 8 e The low pressure outlet port is at the Lo side of the right side emer e A faulty outdoor unit may remain pressurized The oil delivery port employs a Schrader type push to release valve Be careful to avoid accidental oil release when using the port Packless valve or the like Es i Karlie d Container i mi NNN i In SO vr Oil delivery port De ii S i d A H rd He i For 1 4 6 35mm dia GES connector HI Hie EI re a SST H SE d Manifold gauge Lo a Hi Li e BAF Nitrogen gas PN I Low pressure outlet port For 5 16 7 94mm dia Fig 2 8
7. A Jor 4 Ca o 5 1 Cros 500900 BCEE SS SR GE OA and subsequent items are outdoor unit data OA 22 are for unit No 1 2A 42 are for unit No 2 3 WAY VRF SYSTEM 5 Outdoor Unit Alarm History Monitor Outdoor Unit Maintenance Remote Controller Displays outdoor unit alarms only Does not display indoor unit alarms Check the indoor unit alarm histories separately using the indoor unit remote controllers or other control device lt Operating procedure gt Press and hold the CHECK button and button simultaneously for 4 seconds or longer to change to outdoor unit alarm history mode During temperature monitoring displays The display and operations are the same as the monitoring of the alarm device history that is performed using the unit remote controller However the outdoor unit address appears instead of the unit No Press the UNIT button and select the outdoor unit for alarm history monitoring Use the temperature setting and buttons to select the item code for the alarm history The display shows the address of the selected outdoor unit the item code and the alarm history alarm data The outdoor unit address is displayed as R C XX YY System XX Outdoor unit system address R C XX Outdoor unit system address YY Outdoor unit sub bus address always 1 for 3 WAY VRF units Unit code is displayed as 01 08 01 indicates the most recent
8. Section 1 Section 2 Section 3 CONTENTS CONTROL FUNCTIONS 24 sc cteces caveat cane Cab NEE ERR ee 1 1 te MOUNT 1 2 2 Selecting Outdoor Unit for Operation 1 3 3 Compressor COMIC EE ogee oe oe eter oe on cena eee oo 1 4 de ST OMNI ONS eee TE 1 11 5 NT CONICS EE beds sass kanan Ge ER ee He RE RE CR 1 16 6 Operation of Solenoid Valves 1 17 7 Outdoor Unit Electronic Control Valves MOV1 MOV2 MOV4 1 19 8 Outdoor Fan Control EEE ee eo ae 1 21 So DTM erroreren E ewe ee feu see ee S 1 22 10 Indoor Unit Control of the Electronic Control Valve 0 0 ee 1 23 11 Solenoid Valve Kit COMWO EEN 1 25 12 Indoor Special Control ose serie e EIER Sp aces e hw eS He odd am Sele bk ark Swe 1 26 13 Discharge Temperature 1 27 14 Current Protection a okt ere dS we eee eee Siew eau betes Be eee dene 1 28 15 LOW MAA 222 e545 oes coe tees ed 1 29 16 Pressure Sensor Failure 0 ccc ee ee eee eens 1 30 17 BackUp OPA rb con sae Beate EE EE EE EEN SE 1 31 18 Service Maintenance Functions 1 33 19 Omer FUNCIONS Lae Ee eg ee en 1 36 OUTDOOR UNIT REPAIR PROCEDURES 00020 00s 2 1 Ii ROMOVING FaRo 24 die cues ae asec e ees oe ee he eo ea eine 2 2 2 Removing Electrical Component Box and Duc 2 3 3 Discharging Compressor OU 2 5 4 Backup Operation 2x irer tensen de wae ee ou eee ste be gee bowed ak ne 2 6 5 Recovering Refrigerant aana aa
9. 5 30 vi 3 WAY VRF SYSTEM Contents Control Functions 1 CONTROL FUNCTIONS T Ta de e e de EE 1 2 2 Selecting Outdoor Unit for Operation 0 002 ees 1 3 3 Compressor Control 42h ce nc e e e E ee eee ade eh Ee nevn 1 4 4 Special Controls 00 cc es 1 11 5 Other Controls 2 Gud KREE ANE CH RK E ewe eee deed ed sweet eee ew eee es 1 16 6 Operation of Solenoid Valves 0 0 cee ees 1 17 7 Outdoor Unit Electronic Control Valves MOV1 MOV2 MOV4 1 19 8 CUIGOOr Fan COMMU sce ee EE EE EE 1 21 9 Demand Control EE 1 22 10 Indoor Unit Control of the Electronic Control Valve 1 23 11 Solenoid Valve Kit Control ee 1 25 12 Indoor Special Control MEET 1 26 13 Discharge Temperature 1 27 14 Current e ET de MEET 1 28 15 Low ON Al rm 226 cave EE EE serken EERI Sra 1 29 16 Pressure Sensor Failure ee 1 30 IT E Ee ee d EE 1 31 18 Service Maintenance Functions 000 cee ee 1 33 19 Olh r FUNCUONS 2424 054 ERC E ENER EE eee EE Ee 1 36 3 WAY VRF SYSTEM 1 Introduction Control Functions The 3 WAY VRF is a system that allows multiple outdoor units to be connected The outdoor units all contain inverter compressors and the system does not utilize the sub units that were used in earlier systems The outdoor unit where the unit No is set to 1 includes the CCU command controller unit functions that are used to control the entire system As a result the
10. Alarm conditions This alarm occurs when the microcomputer identifies a trouble signal indicating abnormal HIC temperature or other trouble from the HIC The HIC judges the current and temperature and outputs the trouble signal In general this indicates trouble with the HIC itself Probable cause Overcurrent in HIC circuit and the resultant abnormal heating caused by HIC failure Check Check the power wiring and connector wiring If the wiring and connectors are normal use a tester to measure the resistance between the compressor HIC power HIC and ground HIC If there is a short circuit there is an HIC malfunction S i ae Ze 6 HOK DIESO mi dre re seer ON T TOUCH A me ae e GK u RIC E A AT ons ga oe WR d b soe Smee mW ZH ks DI 52 049 Tam gt DI e d oe ms p mm E oke rm S 1 ery RO PCS pogi CC oe eres BR A e ef 4 D 0 1FA4B18100700 e AETA ll Pce assy HIC PCB If an HIC failure is found replace the PCB Turn OFF the power and check the continuity of HIC and HIC on the HIC PCB 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis L04 Alarm Outdoor system address duplication Alarm conditions Communication by inter unit control wiring was received that contained the same address as that unit 5 times or more within 3 minutes Probable cause Incorrect outdoor system address settings Check the system address s
11. Check When the liquid valve is operating and the liquid valve is ON check that the secondary side of the liquid capillaries is cold 2 Insufficient refrigerant Trouble Liquid effectiveness is poor Check Check whether or not the superheating temperature is declining if the evaporator mechanical valve is opened to 300 pulses or more after checking for foreign object intrusion 3 Foreign object intrusion Trouble Liquid valve effectiveness is poor Check Check that there is no difference in the condensation or frost conditions between the strainer primary side and secondary side tubing 4 Crossed thermistor Trouble The discharge temperature of the other compressor is high although only this compressor is operating When the liquid valve turns ON the discharge temperature of the other compressor decreases 5 Accumulation of refrigerant in stopped outdoor units Trouble e System is OK when all outdoor units are operating however symptoms of insufficient gas occur when a certain outdoor unit is stopped e Condensation or frost is visible up to the top of the accumulator of the stopped outdoor unit e After an outdoor unit stops there is the sound of refrigerant flowing into an outdoor unit that was stopped for a long time e When an outdoor unit starts after being stopped for a long time the start is accompanied by much vibration e Representative parts include the liquid capillaries secondary side of capillaries will be cool du
12. Connect the manifold gauge valves at the Lo side to the low pressure outlet port of the outdoor unit to be repaired Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid line service port Schrader type push to release valve Perform the connection work quickly so that no air is allowed to enter Fig 2 20 Connecting the refrigerant recovery cylinder is done to prevent pressure from rising excessively during backup operation by recovering the refrigerant from the outdoor unit to be repaired Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures such as installing a high pressure cutout in the circuit The hoses may be subject to internal pressure from the refrigerant inside the eer outdoor unit Check that the manifold gauge valves are fully closed beforehand A Schrader type push to release valve is provided at each connection port 3 Connect the outdoor unit maintenance remote controller to the RC connector CN006 3P BLU on the outdoor unit control PCB of the outdoor unit to be repaired Then start a test run of all units Press and hold the A CHECK button for 4 seconds 4 Press the CB _ MODE button and change to heating operation Even if the mode that is originally displayed is Heat be sure to press the J MODE button once or more to change to heating operation Pressing the MODE button ensure
13. enters the tubing at this time 12 Open both Hi and Lo side valves on the manifold gauge valves and recover the refrigerant remaining in the outdoor unit After that measure the amount of recovered refrigerant NOTE To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 3 WAY VRF SYSTEM 9 Pumping Out Refrigerant from Outdoor Unit Oper Vi gen tere Faulty outdoor unit Other outdoor unit High pressure outlet port Low pressure outlet port Liquid tube service port For 5 16 7 94mm dia For 5 16 7 94mm dia For 5 16 7 94mm dia Manifold gauge connector connector connector ES 2i Refrigerant recovery cylinder Measuring scale HE HHT me BEDT il mr Connect from here to refrigerant recovery unit Be Fig 2 20 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures 10 1 Compressor Trouble Diagnosis and Check Methods Generally compressor failures can be classified into the following categories 1 Mechanical trouble gt A Locking intrusion of foreign objects galling etc B Pressure rise failure damaged valve seal bearing or other component C Noise damaged stator rotor valve or other component A Coil burning B Open circuit C Insulation failure D Short circuit Trouble diagnosis is based on the following remote controller displays H03 Compressor 1 INV compre
14. s ao 1 tm ss ma ra 07 Discharge temp setting Position of indoor unit electronic control valve 3 WAY VRF SYSTEM Contents Trouble Diagnosis OON eae MeN 5 TROUBLE DIAGNOSIS Contents of Remote Controller Switch Alarm Display 5 2 Outdoor Unit Control Panel LED Display 5 4 Remote Controller Servicing Functions 000 cece eee 5 5 3 WAY VRF Alarm Codes 02 ccc ees 5 7 Blinking Inspection Display on the Remote Controller 05 5 27 INRSDECHON OL PariS ee e Woes edad eee es hehe kee eee Be d eee oe 5 28 TOSTPIN 224 eset meee errn ee EE 5 29 Thermister Characteristics Curve 0 00 cece ees 5 30 3 WAY VRF SYSTEM 1 Contents of Remote Controller Switch Alarm Display Trouble Diagnosis ON Blinking XX OFF Wired Wireless remote controller remote control i receiver display l display Possible cause of malfunction T Si 183 0 I amp amp if 183 Serial Remote controller is detecting Error in receiving serial communication signal Signal from communication error signal from indoor unit main indoor unit in case of group control Outdoor system i i errors address indoor unit address or indoor unit address lt E01 gt Operating lamp Mis setting independent main sub unit setting has not been made SC Auto address is not completed xx D D Error in transmitting serial communica
15. the above information is used to control operation of the outdoor fan 3 At systems where control is not performed is set the snowfall sensor input and above information ignored and the outdoor fan does not operate 4 In the case of a W Multi system control can be performed when snowfall sensor input is connected to any outdoor unit lt Caution gt Snowfall sensor input information is detected once every 10 minutes Therefore the outdoor fan may continue operating for up to 10 minutes even when there is no snowfall sensor input In addition the outdoor fan may remain stopped for up to 10 minutes when snowfall sensor input is present 19 2 Function for Automatic Judgment of Insufficient Refrigerant Gas and Overcharge This system includes a simple function for judging the level of refrigerant However be aware that false judgments may occur if the control elements of the outdoor unit or indoor unit fail 1 Starting refrigerant level judgment mode Short circuit the CHECK pin on the No 1 outdoor for 4 seconds or longer to engage this mode The LED on the outdoor unit PCB begins blinking 2 Conditions for refrigerant level judgment After judgment mode starts judgment occurs when all outdoor units in the system have been operating continuously for 30 minutes or longer Refrigerant level judgment requires that all outdoor units operate continuously for 30 minutes or longer This is in order to prevent incor
16. this control is activated after defrost control is completed turning the thermostat OFF for 3 minutes 12 2 Indoor Unit Thermostat ON OFF Delay Timer 1 After the thermostat turns ON at an indoor unit the thermostat will not be turned OFF by the room temperature thermostat or discharge temperature thermostat for a period of 3 minutes However if the condensation temperature reaches or exceeds the PX temperature the thermostat turns off in order to prevent overload 2 After the thermostat turns OFF at an indoor unit the thermostat will not turn ON again for a minimum of 3 minutes 12 3 Indoor Unit Refrigerant Oil Self Recovery Control This control is performed periodically only during cooling operation 1 At indoor units which are stopped operating in fan mode or where the thermostat is OFF the electronic control valve is opened for 1 2 minutes 2 At indoor units where the thermostat is ON the electronic control valve position is opened by 10 pulses from the current position 3 WAY VRF SYSTEM 13 Discharge Temperature Conirol Functions lt Alarm Information gt 1 Discharge temperature protection alarm This device sets an upper limit discharge temperature of 222 F for all compressors When the discharge tem perature reaches 222 F that compressor is stopped and restarted If the same high discharge condition occurs 4 times then an alarm occurs After a compressor has stopped that compressor will not operate
17. where thermostats are ON 2 Control when outdoor unit heat exchanger is acting as a condenser when all units are in Cooling mode or at start of mixed operation when cooling load is high Control time Minimum 1 min Maximum 10 min until max pressure sensor temp E1 gt 95 F Outdoor units All outdoor units operate at maximum horsepower Electronic control valve Valves at all indoor units operate at 480 pulses Indoor RAP valve kit Valve kits at all indoor units operate in heating mode ON status units Fan Fan operates at the set fan speed stops or operates at L speed depending on the indoor unit operation mode When the above operation is finished normal operation starts at the horsepower determined by the indoor units where thermostats are ON 4 2 System Refrigerant Oil Recovery Control 4 2 1 System refrigerant oil recovery cycle This control is performed using the cooling cycle during cooling operation and using the heating cycle during heating operation 4 2 2 Start of system refrigerant oil recovery control When the oil level in an operating compressor changes to 0 the compressor stops after 120 seconds If this compressor repeats this operation 3 times and the oil level does not reach 2 system refrigerant oil recovery control is started When the compressor has stopped because the oil level is 0 a count is added to the alarm counter The counter for this compressor is not cleared unless the oi
18. 2 compressor is not located near to the check valves therefore no protection is necessary 12 1 When the replacement is available from the right side of the unit 1 Remove the front panel of the outdoor unit then remove the right side panel of the unit 2 Follow the instructions in 9 Pumping Out Refrigerant from Outdoor Unit recover the refrigerant of the outdoor unit where the 4 way valve is located 3 Connect the manifold gauge to the high and low pressure outlet ports at the outdoor unit where the 4 way valve will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement 4 Prepare the brazing kit to disconnect the brazed parts 4 locations exer Protect the check valves as shown in the figure 2 30 CTO RS gt A A ch ed IK a vi E H Y tt ARLE BOF rar e Ge Ca H ed SE V AN Al Ard CG p vA E ANS A at S ae i Ki lt N K SI PERH F aker GE EI X KF Check valve R HIAR aech DE RN Va ei S LU Ki E En D i SSS Jl A ES CS Zo mt 4 way valve Brazed parts Fig 2 30 4 locations 5 After replacing the 4 way valve follow the instructions in 6 Checking for Leakage After Repair and 7 Evacuating System The outdoor unit after replaced 4 way valve shall be checked for gas leakage and perform system evacuation 6 Fully open service valves on the o
19. 3 compressor legs using the bolts washers and rubber washers C v Insert the pre shaped tube assembly at the 3 brazing locations indicated Connect the manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compressor was replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement 10 Perform copper brazing at the 3 brazing locations N eron In the same way as during removal pay particular attention to protection of the oil equalizing tube connector parts shown in the figure 2 28 An O ring is mounted inside the oil equalizer tube connector parts It must be protected and do not lose it 11 Follow the instructions in 6 Checking for Leakage After Repair and check for leaks at the outdoor unit where the compressor was replaced 12 Re install all components that were removed Re install the electrical component box in the same position as it was before Jemen Be sure to check for looseness of the power terminal connection at the compress or terminal plate and to check by pulling vertically on the connections If the terminals become disconnected easily replace the wiring Assy 13 Follow the instructions in 7 Evacuating System and apply vacuum to the outdoor unit where the compressor was replaced 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures C Replacing multiple compressors E Removal 1 F
20. 4 3 4 Outdoor units where defrost occurs Even if the total time has not reached 35 minutes if there is 1 or more outdoor units that fulfills the defrost detection conditions all operating outdoor units perform defrost control at the same time Defrost control is also performed at outdoor units where the outdoor unit heat exchanger is not functioning as an evaporator such as stopped outdoor units 4 3 5 Reverse cycle defrost Reverse cycle defrost is performed in systems where only 1 outdoor unit is connected to the refrigerant system e Defrost flow E Evaporator operation C Condenser operation ESC Switching from evaporator operation to condenser operation C gt E Switching from condenser operation to evaporator operation SSS es Cooling mode SE indoor units E CC HE Heating mode indoor units Stopped 1 min With type E1 E gt C occurs for 3 minutes after defrost ends Therefore the thermostat remains OFF for 3 minutes i 3 WAY VRF SYSTEM 4 Special Controls Control Functions 4 3 6 Outdoor unit cycle defrost Outdoor unit cycle defrost is performed in systems where 2 outdoor units are connected to the refrigerant system 1 Description of outdoor unit cycle defrost With this defrost method when 1 outdoor unit operates in defrost mode heat exchanger operating as a condenser another outdoor unit operates as an evaporator in the same way as in ordinary heating mode In this way the other outdoor
21. Assy 13 Follow the instructions in 7 Evacuating System and apply vacuum to the outdoor unit where the compressor was replaced Tube with flare nut Braze d locations 2 NE SH d TAA Te aR KS NS d Me part DE rv PE pa mE CA zeg yu B sa TE JRe A k RS Le Ane am Cushioning rubber as JE e Q a Front view Bolt Temporary fastening DEE E SS Washer 1 I heater Rubber washer 1 Cushioning rubber Inner 1 leg Fig 2 23 Fig 2 24 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures B Replacing the constant speed compressor Compressor 2 on remote controller alarm display E Removal 1 Connect the manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compres sor will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replace ment 2 Follow the instructions in 1 Removing Panels and 2 Removing Electrical Component Box and Duct and remove the corresponding parts from the outdoor unit where the compressor will be replaced 3 Remove the cap at the compressor terminal plate Disconnect the power terminal 4 Remove the crankcase heater 5 Remove the bolts 3 locations washers and spacers 1 each at the 3 locations shown in the figure The compressor rear leg is not anchored 6 Prepare to disconnect the 3 brazed locations shown
22. C 8 2 Indoor heat exch coil sensor E1 E3 Indoor Heat Exchanger temperature sensor E1 E3 E e e e e eee ee ee ee ee ee Resistance kQ Resistance kQ oo R Temperature C Temperature C 3 WAY VRF SYSTEM 8 Thermister Characteristics Curve Trouble Diagnosis 8 3 Outdoor temp sensor Compressor suction gas temp sensor Outdoor heat exch coil sensor Oil temp sensor Outdoor temperature Suction gas temperature sensor Heat exchanger temperature Oil temperature sensor NJ TT TITT N III NITTI IT TG ERNE SIN e ON III pt titi td 20 15 10 5 10 15 20 60 Ti t C Temperature C emperature C Resistance kQ Resistance kQ 8 4 Compressor discharge gas temp sensor Discharge gas temp sensor TR TT TT TT TT Resistance KQ QD D 80 90 100 110 125 130 Temperature C 201201
23. Control 4 3 1 Defrost control method This system uses the following 2 defrost methods 1 If there is 1 outdoor unit in the refrigerant system Reverse cycle defrost 2 If there are 2 or more outdoor units in the refrigerant system Outdoor unit cycle defrost 4 3 2 Constraint conditions 1 Frost detection does not occur for 5 minutes after operation starts 2 Defrost does not begin again for 35 minutes of A C operation after defrost was once completed 3 If all indoor units are stopped while defrost control is in effect or if the outdoor unit is stopped due to protection control or another reason then defrost control will not start for a minimum of 10 minutes after restart occurs 1 12 3 WAY VRF SYSTEM 4 Special Controls Control Functions 4 3 3 Frost detection A Frost detection does not occur for 5 minutes after operation starts B Frost is detected when either condition 1 or 2 below is met Condition 1 L2 line or below is detected twice each time continuously for 4 minutes when the compressor is operating Condition 2 L1 line or below is detected for a total of 60 minutes when the compressor is operating Heat exchange liquid temperature F A Defrosting operation lt The end temperature is different from 42 8 end temperature the above detection temperature 0265 D External temperature F OQ Per L1 Ji L2 The frost detection area is located under the thick lines EE EE 13
24. Cooling mode indoor units and raising the evaporation temperature Te Outdoor Unit Heat Exchanger Control Table when the outdoor unit heat exchanger is functioning as a condenser Low lt Condensation Temp Tc gt High A B CG D STAY A LB Compressor stop STAY Low lt Evaporation Temp Te High 3 WAY VRF SYSTEM 3 Compressor Control Control Functions 3 Increasing decreasing the heat exchanger capacity when the outdoor unit heat exchanger is functioning as an evaporator e Primarily when both the evaporation temperature Te and condensation temperature Tc are low This occurs when the cooling capacity heat intake is high and the heating capacity heat discharge is low The outdoor heat exchanger capacity Is increased increasing the system evaporation capacity and raising the evaporation temperature Te The amount of heat intake at the outdoor unit heat exchanger increases increasing the heat discharge at the Heating mode indoor units and raising the condensation temperature Tc e Primarily when both the evaporation temperature Te and condensation temperature Tc are high This occurs when the cooling capacity heat intake is low and the heating capacity heat discharge is high The outdoor heat exchanger capacity is decreased decreasing the system evaporation capacity and lowering the evaporation temperature Te The amount of heat intake at the outdoor unit heat exchanger decrease
25. Electrical Component Box and Duct 000 eee 2 3 3 Discharging Compressor Oil 0 00 cee es 2 5 4 Backup Operation 000 ees 2 6 5 Recovering Refrigerant 000 c cee ee 2 9 6 Checking for Leakage After Repair 0000 eee es 2 14 7 Evacuating System NEE 2 15 8 Charging Compressor OW EE 2 16 9 Pumping Out Refrigerant from Outdoor Un cee 2 20 10 COMPIESSO ee NEE EE EE NEE eee ecu de dae eg 2 23 11 High and Low Pressure Gensors cee es 2 35 12 Replacing 4 way valve 0 ce es 2 36 3 WAY VRF SYSTEM 1 Removing Panels Outdoor Unit Repair Procedures Procedures 1 Removing Panels Removing Electrical Component Box and Duct Discharging Compressor Oil Backup Operation Recovering Refrigerant Checking for Leakage After Repair Evacuating System CON DO OO fF W bh Charging Compressor Oil 9 Pumping Out Refrigerant from Outdoor Unit when repairing parts other than compressor 10 Compressor 11 High and Low Pressure Sensors 12 Replacing 4 way valve 1 Front panel removal Fig 2 1 e Remove the front panel remove 11 screws 2 Power outlet panel amp valve cover removal Fig 2 2 e Remove the power outlet panel remove 2 screws e Remove the valve cover remove 2 screws wwen z GA D eder A 202 LUH Power outlet panel Valve cover Fig 2 2 3 WAY VRF SYSTEM 2 Removing Electrical Component Box and Duct Outdoor Unit Repair P
26. F12 Alarm am see m2 ompressor intake temperature sensor trouble 2 A D step is 1014 steps or more open circuit 2 PCB malfunction 1 2 Check Measure the sensor resistance Check that the sensor is operating normally Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis F16 Alarm Marmeode Im Alarm meaning High pressure sensor trouble abnormal rise in high pressure In some cases this may not be the result of a high pressure sensor malfunction Alarm conditions e High pressure SW activated although the detected pressure was lower 439 4 psi or below than the high pressure SW activation pressure Undershift e High pressure SW failed to activate although the detected pressure was higher 497 5 psi or above than the high pressure SW activation pressure Overshift e The saturation temperature at the detected pressure is 10 F or more below the highest indoor unit E1 temperature continuously for 30 minutes e High pressure sensor disconnected or open circuit Probable cause High pressure sensor malfunction Failure to connect the connector to the outdoor unit PCB Failure to open the service valve Clogged tubing Valve leakage Over charging Outdoor unit PCB failure Electrical noise High pressure sensor failure e Check the sensor resistance value Use a tester and measure the resista
27. Operation Outdoor Unit Repair Procedures e After adjusting the amount of refrigerant turn OFF the power at the failed outdoor unit release the short circuit at the vacuum application pin and close the liquid tube valve at the failed outdoor unit Refrigerant recovery is not affected by the power status of the failed outdoor unit However collecting refrigerant in the failed outdoor unit is affected by whether the power at that outdoor unit can be turned ON If the power cannot be turned ON use a refrigerant recovery device and recover the refrigerant into a recovery cylinder in order to adjust the amount of refrigerant in the system 4 2 2 Backup operation by setting the failed compressor not to operate Backup operation settings for each compressor INV compressor AC1 compressor Setting for backup operation OK Failed DIP switch S010 Turn BACK UP and AC1 ON Failed OK DIP switch S010 Turn BACK UP and INV ON 3 WAY VRF SYSTEM 5 Recovering Refrigerant Outdoor Unit Repair Procedures The following equipment and tools are required Jumper wire with clips adjustable wrench set of manifold gauge valves specially designed for refrigerant R410A only vacuum pump refrigerant recovery unit pre purged refrigerant cylinder for recovery flathead screwdriver and outdoor unit maintenance remote controller 5 1 Refrigerant Recovery Procedures from outdoor unit 1 2 3 Turn off the power of the outdoor unit befor
28. The connecting port employs a Schrader type push to release valve When Follow the instructions in 10 2 4 Dry core cleaning and perform dry core cleaning of the outdoor unit that failed 3 WAY VRF SYSTEM 10 Compressor Outdoor Unit Repair Procedures 10 2 3 Replacing all compressors in a system 1 Follow the instructions in 3 Discharging Compressor Oil and drain the oil from the oil separators in all outdoor units Measure the amount of drained oil 2 Follow the instructions in 10 3 Removing and Installing Compressors and replace all compressors in the system 3 Follow the instructions in 6 Checking for Leakage After Repair and check for leaks at all outdoor units and in the tubing 4 Follow the instructions in 7 Evacuating System and apply vacuum to all outdoor units and tubing Fully close the high and low pressure gauge valves on the manifold gauge then stop the vacuum pump Disconnect the manifold gauge from vacuum pump Connect the manifold gauge to the refrigerant cylinder Be especially careful that air does not enter the tubing Bo een Do not reuse the recovered refrigerant Use a refrigerant cylinder that contains unused refrigerant 7 Open the valve on the refrigerant cylinder and open the high pressure gauge valve on the manifold gauge When charging has been completed with an amount of new refrigerant equal to the amount of recovered refrigerant or when charging with
29. a new alarm However it is believed that this occurs for a comparatively short time only In these cases a mode automatic backup mode that limits operation may be engaged e Control is not possible when a communications system alarm has occurred Automatic backup mode is not engaged in order to avoid causing secondary damage 3 WAY VRF SYSTEM 5 Blinking Inspection Display on the Remote Controller Trouble Diagnosis Blinking inspection display 2 compressor magnet SW seizing detection Blinking inspection display Alarm meaning Compressor magnet SW seizing detected Status Although an outdoor unit exists where the outdoor unit fan is running no compressors in the system are operating yr Because the fan is running only at the outdoor unit where seizing was detected check the corresponding outdoor unit The fan may also run on its own when fan cracking prevention control is in effect or when snowfall sensor input is present Therefore monitor for approximately 10 minutes if the outdoor unit fans are operating at multiple units Alarm conditions Current is detected in the CT circuit when the compressor is stopped 1 This control is not engaged for the first 30 seconds after the compressor turns ON gt OFF 2 For 1 minute following the first 30 seconds after the compressor turned ON OFF the threshold for the detected current is 10 or more continuing for 2 seconds 3 All times other than the above e If the low pressu
30. connector 3 2 Discharging Oil in Compressor Recover the refrigerant in the outdoor unit following the procedures in 5 Recovering Refrigerant Remove the compressor and discharge the oil in it Refer to 10 Compressor for detailed procedures 3 3 Checking the Oil Acceptance rejection criteria for the oil Condition of Condition of oil Judgment criteria for changing oil refrigeration cycle Color Odor Totalacidvalue Hue Abnormal TE Smells somewhat Tee ze overheat operation not as strong as below NN with dry cores are necessary seer Brownish Pungent burnt odor Changing the oil and system cleaning blackish with dry cores are necessary It is difficult to measure the total acid value in the field therefore oil hue and odor are the rule of thumb Checking for carbon deposits and abrasive metal powder can additionally be used to assess the system condition 3 WAY VRF SYSTEM 4 Backup Operation Outdoor Unit Repair Procedures This system includes an emergency automatic backup function that allows the A C to operate during the period after trouble occurs until repairs are made However during repair and at other times use manual backup operation 4 1 Automatic Backup For details refer to the control functions section After the alarm details are sent to the control device control for automatic backup operation begins when the ON OFF button of the wired remote controller is press
31. in the figure EN pr Al CSL E Ber d A BN CT ee ae ag SEN N ANLA Med RA e RUN e Fa SN 1 d ES S BS H AIN i Ciji lak Zia CH Constant speed SH LIG compressor ly x WH me gt Brazed locations 3 left side A I SCH e Remove discharge sensor Protect the oil equalizer tube connectors Bolt Washer 1 Rubber washer 1 1 each at the 3 locations II SECH D KK GR re N NILLE Ir I ei L i eh JD DM De CH d L KM gt gt Ve 5 ee eee Crankcase heater Fig 2 25 e Protect the sensors and surrounding plates rubber lead wires clamps and J N other items Pay particular attention to protection of the oil equalizer tube connector parts and removal of the discharge sensor An O ring is mounted inside the oil equalizer tube connector parts It must be protected and do not lose it Disconnect the 3 brazed locations shown in the figure 2 25 First disconnect the 1 4 96 35 mm tube then disconnect the 1 2 12 7 mm and 7 8 822 22 mm tubes Pull the compressor toward you 3 WAY VRF SYSTEM Outdoor Unit Repair Procedures 10 Compressor E Installation 1 Remove the 2 brazed tube caps 2 pieces from the compressor 2 Remove hexagonal caps from the compressor When removing the hexagonal caps hold the fixing nut at the main unit side so as not to loose it witha wrench or spanner And then loosen and remove the hexagonal cap H
32. leaked into stopped sub units it is likely that valve leakage has occurred The valve must be replaced Example 19 O Notes 19 O 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis H07 Alarm Alarm meaning No oil alarm Alarm conditions This alarm occurs when oil does not flow for a specified amount of time in tubing where oil flow constantly The presence of oil is detected by a temperature sensor Judgment method Tcal calculated by the formula below from the oil temperature is compared with the discharge temperature If Tcal is higher than the discharge temperature then oil is judged to be present If Tcal is lower than the discharge temperature oil is judged to be not present Tcal 0 0254 T oil LP 0 0298 T_oil LP 0 8842 T_oil 2 9953 LP 11 091 LP 436 94 2 9953 HP 11 091 HP 436 94 0 0254 HP 0 0298 HP 0 8842 These points are calculated from the oil temperature and compared with the discharge temperature Lower than the ee temperature No oil Discharge temperature High pressure Higher than the discharge temperature Oil present Low pressure Oil temperature Probable cause Insufficient amount of oil in the system 1 The length of system tubing exceeds the allowable tubing length 2 The difference in height between system units exceeds the allowable value 3 A large amount of oil was drained when a compressor was replaced 4 Oil has accumulated in a
33. new refrigerant has not been completed but no more refrigerant will enter the unit fully close the high pressure gauge valve on the manifold gauge Next turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Finally fully open all valves on the suction tube discharge tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed If backup operation was engaged follow the instructions in 4 Backup Operation and perform backup Operation recovery If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible fully close the high pressure gauge valve on the manifold gauge Then while the unit is operating according to 5 2 1 Cooling operation for all units open the low pressure gauge valve on the manifold gauge and charge with the designated amount of refrigerant When charging with liquid refrigerant add refrigerant a little at a time in order to Nezey prevent liquid back flow Fully close the low pressure gauge valves on the manifold gauge follow the instructions in 8 Charging Compressor Oil and charge with the necessary amount of oil Also add an amount of oil that is equivalent to the amount that was drained from the oil separator Remove the manifold gauge disconnecting the hose pressure will be applied from the refrigerant in the outdoor unit Nezen
34. nitrogen gas from the tubing apply vacuum from the liquid tube service port to all outdoor units where dry cores are attached until the pressure is 14 7 psig 5 Torr or less 8 Fully open the liquid tube valve and ball valve on all outdoor units where dry cores are attached 9 Operate all outdoor units for approximately 3 hours in either Heating or Cooling mode or mixed Cooling and Heating mode 10 Follow the above procedure and replace all dry cores with new dry cores 11 Operate all outdoor units for approximately 20 minutes in either Heating or Cooling mode or mixed Cooling and Heating mode 12 Follow the instructions in 3 Discharging Compressor Oil and drain a small amount of the oil from the oil separators of all outdoor units where dry cores are attached Check the color phase odor and other characteristics 13 If the results show that dry core cleaning is still necessary for example a color phase of 4 0 or higher return to Step 11 and repeat until the results are normal including a color phase of 3 5 or less Perform another dry core replacement after approximately 30 hours of system operation 14 Perform steps 1 4 and remove all dry cores Then connect the tubing between the liquid narrow tube valves and the ball valves 2 27 3 WAY VRF SYSTEM 10 Compressor Outdoor Unit Repair Procedures 15 At all outdoor units where dry cores were removed pressurize with 522 1 psi of nitr
35. not displayed on the remote controller Therefore check the blinking on the outdoor unit PCB Correction Wait for automatic address setting to be completed at the outdoor unit where it is currently in progress Then start automatic address setting again Moies ie E15 Alarm gemenge Je Automatic address setting alarm too few units The number of indoor units was too few when automatic address setting was performed Probable cause 1 The number of indoor units set at the indoor unit quantity setting SW 5004 5005 on the outdoor unit PCB is too many 2 The inter unit control wiring between indoor units has been cut 1 Refer to the test run servicing materials and check the indoor unit quantity setting SW S004 S005 2 Check the inter unit control wiring at the indoor and outdoor units Correction After correcting the indoor unit quantity setting or the inter unit control wiring perform automatic address setting again Exampe _ J gt S O 3 WAY VRF switch position 9 Teg GE APL OM 12 re EN ZEN WWW TE g t TE d RUN STOP MIE AA R nn APS s KT H DU A kA THEN Wii pA er d e oF Ser HINN d IN 2 S iii o E UV Lu NN Se ico 1634 via te AA gn gt RH t TTD LU D m f A e G e i ae A nn I 32 LA Add ec A ct gd e PAF pA sw x dun ST a Ss AER HER io DN ee ef 23 13 SILENT 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diag
36. operation During mixed cooling heating operation the control maintains a heat balance with a target evaporation temperature Te for the Cooling mode indoor units of 35 42 F and a target condensation temperature Tc for the Heating mode indoor units of 116 118 F Heat balance control is performed by varying the compressor capacity and heat discharge heat intake of the heat exchanger 1 Increasing decreasing the compressor capacity e When evaporation temperature Te is high and condensation temperature Tc is low This occurs when both the cooling capacity heat intake and the heating capacity heat discharge are low The compressor capacity and the circulation flow of refrigerant are increased in order to lower the evaporation temperature Te and raise the condensation temperature TC e When evaporation temperature Te is low and condensation temperature Tc is high This occurs when both the cooling capacity heat intake and the heating capacity heat discharge are high The compressor capacity and the circulation flow of refrigerant are decreased in order to raise the evaporation temperature Te and lower the condensation temperature Tc Under conditions other than those listed above the capacity of the outdoor unit heat exchanger is adjusted In some cases the heat exchanger capacity may also be adjusted at the same time when the compressor Capacity is varied 3 WAY VRF SYSTEM 3 Compressor Control Control Function
37. parts and wiring e Keep your fingers and clothing away from any moving parts e Clean up the site after you finish remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced e Do not clean inside the indoor and A N outdoor units by users Engage authorized dealer or specialist for cleaning e In case of malfunction of this appliance do not repair by yourself Contact to the sales dealer or service dealer for a repair 2 Check of Density Limit The room in which the air conditioner is to be installed requires a design that in the event of refrigerant gas leaking out its density will not exceed a set limit The refrigerant R410A which is used in the air conditioner is safe without the toxicity or combustibility of ammonia and is not restricted by laws imposed to protect the ozone layer However since it contains more than air it poses the risk of suffocation if its density should rise excessively Suffocation from leakage of refrigerant is almost non existent With the recent increase in the number of high density buildings however the installation of multi air conditioner systems is on the increase because of the need for effective use of floor space individual control energy conservation by curtailing heat and carrying power etc Most importantly the multi air conditioner system is able to replenish a large amount of refrigerant compared to conventional indivi
38. place with waste cloth while watching out for oil leaks Then cap the disconnected tube and mount the flare nut on the compressor Tighten the flare nut with a seal bonnet 1 4 in it NOTE If oil remaining in the compressor reaches the equalized oil level oil will come pouring out when the tube with flare nut is removed 7 Prepare to disconnect the 2 brazed locations shown in the figure Protect the sensors and the surrounding plates rubber lead wires clamps and other items Remove the discharge sensor shown in the figure 2 22 8 Disconnect the 2 brazed locations shown in the figure below 9 Pull the compressor toward you When pulling the compressor toward you be careful not to cause any abnormal een deformation of the tube with flare nut Remove the discharge sensor pr NG her v r D Inverter compressor Bolt Washer 1 Rubber washer 1 Brazed locations 2 Tube with flare nut VUL Bolt Washer 1 a gt Rubber washer 1 KA Bolt Washer 1 Rubber washer 1 Crankcase heater Front view Fig 2 22 2 29 3 WAY VRF SYSTEM 10 Compressor Outdoor Unit Repair Procedures E Installation 1 Remove the rubber stopper and tube cap brazed from the new compressor 2 Install the crankcase heater onto the new compressor 3 Place the 2 pieces of cushioning rubber in the designated positions on the compressor 4 Place the 2 pieces of cushioning rubber onto the leg
39. recovery cylinder is done to prevent pressure from rising excessively during the backup operation by recovering the refrigerant from the outdoor unit to be repaired Measure the weight of the refrigerant and cylinder itself beforehand and provide sufficient safety measures such as installing a high pressure cutout in the circuit The hoses may be subject to internal pressure from the refrigerant inside the Nezey outdoor unit Check that the manifold gauge valves are fully closed beforehand A Schrader type push to release valve is provided at each connection port 3 Determine the outdoor unit where the unit No setting 5007 3P DIP switch BLU on the outdoor unit control PCB is set to No 1 4 Short circuit the mode change pin CN101 on the outdoor unit control PCB of the No 1 unit Then short circuit the test run pin CN023 to start operation Short circuiting the mode change pin ensures that heating cooling operation is not mixed and that all units are operating in either Heating or Cooling mode 5 Check the displays of the indoor unit remote controllers Check that all units are operating in Heating mode If all units are operating in Cooling mode perform the steps listed below With the 3 way valve it is difficult to determine whether operation is heating or Nezey cooling by touching the tubing 6 Release the short circuit at the test run pin on the outdoor unit control PCB of the No 1 unit Then short circuit the
40. up to 70 of rated current kee OI CO Shutdown state EH Input present x Input not present The rated current indicates the current value that is listed in the catalog or similar material If the capacity of this device is insufficient the inverter compressor raises its operating frequency in order to maintain capacity For this reason it is capable of operating at a current which exceeds the rated current up to approximately 130 3 WAY VRF SYSTEM 10 Indoor Unit Control of the Electronic Control Valve Control Functions 10 1 Normal Control 1 Cooling operation Position of electronic control valve Outdoor unit operating gre Stopped 20 Fan 0 Thermostat g Thermostat Performs SH control in the range of 55 480 ON pulses The SH target value is controlled so that the difference E3 E1 is 4 12 F depending on the operating conditions However a decline in the required level may cause the SH target value to increase Be aware that in this case the electronic control valve closes slightly This can be easily identified incorrectly as insufficient gas 2 Heating operation A Except Type E1 Position of electronic control valve Outdoor unit operating Zeen Stopped Shuts off refrigerant at 20 pulses Shuts off refrigerant at 20 pulses Biereg Shuts off refrigerant at 20 pulses meatng Thermostat Performs SC distribution control within the range of 55 ON 480 pulses The SC target
41. value is controlled so that the difference Pressure temp sensor E1 is 10 40 F depending on the operating conditions B Type E1 Position of electronic control valve Outdoor unit operating Outdoor unit stopped Stopped 20 SS n 20 Thermostat D OFF a neang Thermostat Performs SC distribution control within the range of 55 ON 480 pulses The SC target value is controlled so that the difference Pressure temp sensor E1 is 10 40 F depending on the operating conditions However if installation is combined with except type E1 the value is controlled so that the difference Pressure temp sensor E1 is 10 80 F 3 WAY VRF SYSTEM 10 Indoor Unit Control of the Electronic Control Valve Control Functions 10 2 Special Control SE Subject indoor units Position of electronic control valve Tube refrigerant oil All indoor nite dee for cooling according to indoor unit r r ntrol l All indoor units Stopped Cooling control according to indoor unit capacity Fan Cooling control according to indoor unit capacity DENS Cooling control according to indoor unit capacity Thermostat Cooling control according to indoor unit capacity OFF However position is 20 pulses for type E1 Thermostat Fixed pulse for heating according to indoor unit capacity Thermostat Heating control according to indoor unit capacity OFF However position is 20 pulses for type E1 Stopped Rever
42. with operating mode priorities ON OFF of Operation change control in progress display This setting switches the operation when the weekly timer is connected to the remote controller This can be used to prevent cases in which the unit is accidentally left ON There is no change when this setting is ON however it is necessary to set the weekly timer ON time OFF reminder function for weekly timer Continued 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions Continued from previous page enee tem besenpton OYO 3C Heat exchanger temperature for The heat exchanger temperature control point for prevention of cold air cold air discharge discharge during heating operation can be changed ee The indoor unit PCB optional output for the fan can be switched Fan output switching according to the purpose of use Drain pump delayed start time The drain pump starts after the set time delay after cooling operation stops Humidifier drain pump setting This specifies the humidifier and drain pump setting DC flap operation mode Changes flap operation to draft reduction mode DC flap swing mode Selects the swing operation mode for the flap Sets the humidifier output ON time for when the humidifier is operating Humidifier ON time ON OFF control is performed during humidifier operation This setting therefore sets the ON time per 60 second interval This setting enables a function that stops operation when
43. 5 Hz Occurs when HIC detects overcurrent 75 A or when an abnormal high temperature 302 F is reached The inverter current includes a primary current and secondary current The alarm judgment utilizes both currents Generally the secondary current is larger that the primary current 3 Constant speed compressor An alarm occurs when overcurrent or lock current is detected List of overcurrent and lock currents Outdoor unit Constant speed Overload Lock current type compressor current A A 96 LI GCompressor2 234 273 List of Alarms Compressor Compressor 2 No Detected Lock Overcurrent current current Alarm display 4 CT circuit detection trouble Alarm Description _ Compressor 1 inverter H03 Occurs when an open CT circuit is detected in the inverter compressor compressor H13 Compressor 2 constant Occurs when a current value of 1 5 A or less is detected speed compressor when the constant speed compressor is operating If the inverter compressor operating frequency is low the current value is also low Therefore this alarm is detected only when the compressor is stopped The operating current of the constant speed compressors is always higher than 1 5 A Therefore this alarm occurs as the result of an open circuit or failure 3 WAY VRF SYSTEM 15 Low Oil Alarm Control Functions Ordinary operation is resumed after system oil recovery control is completed If a stop occurs agai
44. 6 6 116 6 116 4 Horsepower increase Area AB 113 0 permitted 112 8 Horsepower increase Area A 100 4 permitted Depending on the maximum requirement level of the indoor unit the judgment temperatures 8 6 for each area may vary as shown in the figure 0 15 30 example Maximum requirement level L 1 For indoor units which are operating in Heating mode if one unit is selected for a test run the air intake temperature difference is ignored however Tc control is performed according to the figure above in order to prevent excessive load This is used for test run checks etc 2 Even within the same area the compressor capacity varies depending on the refrigerant temperature 3 Temperature PX is the coefficient value used to correct for any deviation with the high pressure or condensation temperature It may vary At the time of shipment it is 125 F 4 If the condensation temperature Tc enters area D and the thermostat turns OFF the next time the compressor starts it may restart from a lower capacity 5 When the area changes to area C area C is considered to be area B for control purposes for the first 6 minutes even if the horsepower is the minimum value within the range where capacity control is possible operation with inverter frequency of 25 Hz only Subsequently if C area continues the thermostat turns OFF 3 6 3 Control of condensation temperature and evaporation temperature during mixed cooling heating
45. CCT failure Check the power wiring and connector wiring It is possible to resolve this trouble by limiting the maximum frequency Exampe l gt OSO Notes deoe O P22 Alarm Alarm meaning Fan motor trouble Alarm conditions Fan motor start failure fan motor Hall IC input failure Probable cause Possible causes are a Hall IC input circuit failure and a fan HIC failure Check Check the fan motor wiring the Hall IC wiring and the connector connections If the wiring and connectors are normal then check that the capacitor of the Hall IC input circuit is securely soldered onto the PCB Also use a tester and measure the resistance between fan HIC power HIC and ground HIC If there is a short circuit there is an HIC malfunction g EE gt DON T TOUCH i t gt ae ml C003 Tee Fan circuit on the outdoor unit control PCB In the 3 WAY VRF the fan circuit PCB is integrated with the outdoor unit PCB Correction If the fan does not start the below corrections may be effective 1 If there is a fan HIC failure or circuit failure replace the PCB 2 If the fan motor is locked replace the fan motor Example EG Notes Turn OFF the power and check the continuity of and on the fan circuit PCB 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis P26 Alarm Alarm meaning Inverter compressor high frequency overcurrent alarm Alarm conditions This alarm occurs when current trouble o
46. Carefully read this instruction booklet before beginning Follow each installation or repair step exactly as shown amp Observe all local state and national electrical codes Pay close attention to all warning and caution notices given in this manual This symbol refers to a hazard or A N unsafe practice which can result in severe personal injury or death This symbol refers to a hazard or unsafe practice which can result CAUTION I in personal injury or product or property damage If Necessary Get Help These instructions are all you need for most installation sites and maintenance conditions If you require help for a special problem contact our sales service outlet or your certified dealer for additional instructions In Case of Improper Installation The manufacturer shall in no way be responsible for improper installation or maintenance service including failure to follow the instructions in this document SPECIAL PRECAUTIONS When Wiring seesesseseeseeseeseeseeseeseeseeseeseesesseeseeseeseeseeseeseeseeseseessseseseessee ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH ONLY A QUALIFIED EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM e Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked e Highly dangerous electrical voltages are used in this system Carefully refer to the wiring diagram and these instructions when wiring Improper conn
47. EN EN O Upper limit D re IN O O O LO Lower limit 0026 0027 80 F Upper limit at shipment o Humidifier operation ED Ne 0001 Ignore heat exchanger temperature conditions 0000 Filter input differential pressure switch input Filter CN70 input 0001 Alarm input for trouble input about air cleaner or similar device switching 0002 Humidifier input Operates linked with drain pump when humidifier is ON Indoor unit electronic EA control valve 4 6 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions Item code Setting data No Description 0000 No forced operation 0001 Forced operation for 1 minute operation d 0060 Continuous operation Ventilation fan operation 90 INone 0001 Ventilation fan operated by remote controller Wired remote controller 0000 Not used Body sensor is used sensor 0001 Remote control sensor is used Operation change 0000 Normal displayed control in progress ge 0001 Not displayed OFF reminder function 0000 None for when weekly timer is used 0001 Only stop time setting is enabled Discharge 0000 Discharge temperature control OFF temperature control 0001 Discharge temperature control ON ee 0000 RAP valve control OFF valve 0001 RAP valve control ON Heat exchanger 0013 Control temperature 55 F temperature for cold air 0014 Control temperature 57 F discharge Heat exchanger control point
48. ERE Fore eo Senang eM re De Pe pe pe Unit hour e X indicates that there is no corresponding filter indicates the filter sign ON time that is set at shipment e High fouling Set when O I is selected for the degree of filter fouling item code kl l P du Vand 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions hemeode mem JO beserplion Set when using a central control device Central control address Used when setting the central control address manually from the remote controller o Operating mode priority change Note 1 1 Explanation of operation mode priority change Enabled only in 2WAY VRF heat pump models lt Function gt With indoor units that are installed in combination with an outdoor unit model where either heating or cooling operation can be selected the operating mode of the indoor unit that starts first takes priority The first indoor unit to operate can select any operating mode When any mode other than fan mode is selected then the operating modes that cannot be selected are not displayed on all remote controllers that are subsequently operated Operation change control in progress is displayed indicating that there are restrictions on the operating modes that can be selected e Controlling the operating mode from a specific remote controller When there are multiple remote controllers in the same refrigerant system it is possible to set one
49. I o TN I wm O O PN LOT HEIDI IR Balance tube Dry core Bidirectional type for R410A DER Liquid tube Discharge tube Suction tube Fig 2 21 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures 10 3 Removing and Installing Compressors When removing and installing compressors use sufficient caution to ensure that moisture or other substances do not enter the refrigerant tubing system 10 3 1 Replacing compressors For all types 72 and 96 follow the replacement procedure below A Replacing the inverter compressor Compressor 1 on remote controller alarm display E Removal 1 Connect a manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compressor will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement in the outdoor unit tubings 2 Follow the instructions in 1 Removing Panels and 2 Removing Electrical Component Box and Duct and remove the corresponding parts from the outdoor unit where the compressor will be replaced 3 Remove the cap at the compressor terminal plate Disconnect the power terminal 4 Remove the crankcase heater 5 Remove the 3 bolts and remove the washers and rubber washers quantities indicated in the figure below 6 Disconnect the tube with flare nut using two adjustable wrenches At this time cover the tube in
50. No of outdoor units 1 x 5 minutes In addition oil supply is ended if the oil receiving outdoor unit oil level changes to 2 or if the oil supply outdoor unit oil level becomes low 3 The supply of oil is received from 1 unit at a time in sequence according to the order of priority of their inverter compressors 4 Operation during unit refrigerant oil recovery A Oil receiving outdoor unit The recovery valve turns ON and remains ON Because self separator oil recovery may occur simultaneously at the same unit both the balance valve and recovery valve turn ON at this time B Oil supply outdoor unit The balance valve turns ON and remains ON The bypass valve repeatedly turns ON and OFF according to a fixed cycle When the balance valve is ON the oil in the oil separator is discharged into the balance tube The bypass valve releases high pressure gas which forces this oil toward the oil receiving outdoor unit and flushes out the balance tubes The operation of this bypass valve allows oil to be supplied even when there is a difference in height between the outdoor units 5 1 5 Indoor unit refrigerant oil self recovery control Refer to the items concerned with indoor unit special control 1 16 3 WAY VRF SYSTEM 6 Operation of Solenoid Valves Control Functions 6 1 Refrigerant Control Valve RCV The main purpose of this valve is to detect the flow of refrigerant refrigerant volume on the indoor unit side wh
51. Panasonic SERVICE MANUAL 410 U 72MF1U9 U 72MF1U9E U 96MF1U9 U 96MF1U9E SWAY VRF SYSTEM Model No Outdoor Units Class 72 96 U 72MF1U9 U 96MF1U9 Model Name U 72MF1U9E U 96MF1U9E Refrigerant R410A is used in the outdoor units Salt Air Damage Resistant Specifications Indoor Units 7 9 12 18 24 36 U1 4 Way Cassette S 12MU1U6 S 18MU1U6 S 24MU1U6 S 36MU1U6 D1 1 Way Cassette 5 07MD1U6 S 09MD1U6 S 12MD1U6 F1 Low Silhouette Ducted S 07MF1U6 S 09MF1U6 S 12MF1U6 S 15MF1U6 S 18MF1U6 S 24MF1U6 S 36MF1U6 S 48MF1U6 S 54MF1U6 M1 Slim Low Static Ducted S 07MM1U6 S 09MM1U6 S 12MM1U6 S 15MM1U6 S 18MM1U6 gr Hien Stale Pressure S 36ME1U6 S 48ME1U6 Ducted T1 Ceiling S 12MT1U6 S 18MT1U6 S 24MT1U6 K1 Wall Mounted S 07MK1U6 S 09MK1U6 S 12MK1U6 S 18MK1U6 S 19MS1U6 S 24MK1U6 P1 Floor Standing S 07MP1U6 S 09MP 1U6 S 12MP1U6 S 15MP1U6 S 18MP1U6 S 24MP1U6 i Ser pnma somam Senne Necessary to install the External Electronic Expansion Valve Kit Optional CZ P56SVK1U 85464849301000 REFERENCE NO SM830201 00 IMPORTANT Please Read Before Starting This air conditioning system meets strict safety and operating standards As the installer or service person it is an important part of your job to install or service the system so it operates safely and efficiently For safe installation and trouble free operation you must
52. RF Alarm Codes Trouble Diagnosis With type 72 the INV compressor is compressor 1 With type 96 the INV compressor is compressor 1 and the constant speed compressor is compressors 2 06 Outdoor unit failed to receive serial communication signals from indoor unit 5 9 12 Automatic address setting start is prohibited EH E15 Automatic address setting alarm too few units EH Outdoor unit INV failed to receive communications from another outdoor 5 10 unit constant speed Outdoor unit address setting failure duplication Mismatch in outdoor unit quantity Outdoor unit failed to receive communication from outdoor unit main F04 Compressor 1 discharge temperature sensor trouble F12 F23 Gas temperature sensor trouble at outdoor heat exchanger 2 In 579 F24 Liquid temperature sensor trouble at outdoor heat exchanger 2 Out 15 13 F31 Outdoor unit non volatile memory EEPROM trouble Lag C Hn H11 E06 E20 E24 E25 E26 E29 F04 F05 FO6 FO7 F08 F23 F24 F31 03 06 07 08 27 31 L04 o 0 Outdoor system address duplication Outdoor unit capacity not set Outdoor unit model mismatch 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis P03 Compressor 1 discharge temperature trouble High pressure switch activated Reverse phase or missing phase detected Compressor 1 INV overcurrent Compressor 2 discharge temperature trouble Fan motor trouble Inverter compr
53. W If the voltage is output there is a PCB failure 3 Installation error e CT1 connector is connected to the compressor 2 side e CT1 circuit is connected to the compressor 2 side e CT2 connector is connected to the compressor 1 side e CT2 circuit is connected to the compressor 1 side 4 Electrical noise 1 Replace the CT circuit 2 Replace the magnet SW 3 Replace the PCB If the above probable causes are not the cause of the alarm it is possible that in rare cases Correction the alarm may be caused by the effects of noise See notes Notes The effects of electrical noise are difficult to identify unless a PC is connected and the conditions are monitored for a long period of time 3 WAY VRF SYSTEM 6 Inspection of Parts Trouble Diagnosis 1 High pressure switch 63PH1 63PH2 e 63PH1 Disconnect the CN042 connector 3P WHT from the outdoor unit control panel Measure the resis tance between socket pins 1 and 3 The resistance is OK if the result is 0 Q e 63PH2 Disconnect the CN044 connector 3P RED from the outdoor unit control panel Measure the resis tance between socket pins 1 and 3 The resistance is OK if the result is 0 Q 2 Electronic control valve MOV1 MOV2 MOV4 After removing the connector from the PCB use the following methods to check the valves e MOV1 Measure the voltage between plug pin 5 and pins 1 through 4 at the CNO15 connector 6P WHT on the outdoor unit control PCB Because of the
54. a aaea eee teen ene naa 2 9 6 Checking for Leakage After Repair 0 0 ccc ees 2 14 de Evac ating SYSIOM ane cence nre dante Ee ho bes koe E EE eee 2 15 8 Charging Compressor OU 2 16 9 Pumping Out Refrigerant from Outdoor Un 2 20 10 CNN ER eh ane a ee eters ae CN E alee fe glee ese ge ee wt Eres Ge 2 23 11 High and Low Pressure Sensors 0 0 ccc eee eee teens 2 35 12 Replacing 4 way valve 0 ee eee eee ene eens 2 36 OUTDOOR UNIT MAINTENANCE REMOTE CONTROLLER 3 1 ie VENN eee 3 2 2 50 ENE 3 3 3 Ordinary Display Controls and Functions 3 4 4 Monitoring Operations avavvn rv nr v rv eee eee eee eens 3 9 5 Outdoor Unit Alarm History Monitor 3 11 6 Mode Settings sere ser he eee ee de ee eb aes 3 12 Section 4 Section 5 REMOTE CONTROLLER FUNCTIONS eee ees 4 1 1 Simple Settings UNCHOMaawi sade see ede ew ees ER a eee ee oa 4 2 2 Detailed Settings Funchon 0 0 0 cc eee eee eens 4 4 3 Remote Controller Servicing Functions 0 000 ccc ees 4 15 TROUBLE RE Le LEE EEN 5 1 1 Contents of Remote Controller Switch Alarm Display 5 2 2 Outdoor Unit Control Panel LED Display ss ve AECH EE EE ACEN E E 5 4 3 Remote Controller Servicing Functions 0 ees 5 5 4 3 WAY VRF Alarm Bee 5 7 5 Blinking Inspection Display on the Remote Controller 5 27 6 Inspection of Ee SE dE E ee EE EE E Bae and 5 28 ETG EE 5 29 8 Thermister Characteristics une
55. able cause 1 Sensor malfunction e Sensor element malfunction e Sensor wiring is partially disconnected resulting in increased electrical resistance Xx This alarm does not occur when the wiring is cut or when the connector is not connected to the outdoor unit PCB 2 Crossed wiring or installation error e The discharge temperature sensor of that compressor is connected to the discharge tube of the other compressor e The connector for the discharge temperature sensor of the problem compressor is connected to the outdoor unit PCB connector for the other compressor 3 Outdoor unit PCB failure 4 The check valve on the discharge tube for that compressor is wet 5 An air short blockage in the area around the outdoor unit has increased the outdoor unit ambient temperature reducing the cooling effects after the compressor stops 6 There is a cause that results in P0O3 P17 or P02 alarm 7 Electrical noise 1 Sensor malfunction and outdoor unit PCB failure Trouble e Constantly indicates a high temperature e When monitoring software or other means are used for monitoring the discharge temperature at times fluctuates suddenly and wildly e In some cases the precise temperature may not be known even when monitoring software is used e Wiggle the sensor and check whether the trouble continues e Check whether the connector is partially disconnected from the PCB yr An F04 alarm will not result if the connector is completely disconnected circ
56. acing a faulty compressor be sure to first measure the amount of remaining oil in the compressor Charge additional new oil equal to the difference in the remaining oil and the rated amount as listed above For example Type of replaced compressor JT 160G KTTJ Remaining oil in the removed compressor 0 58 gal Additional oil to be charged 0 58 gal remaining oil in the removed compressor 0 55 gal rated oil amount 0 026 gal If the result is a negative amount remaining oil in the removed compressor is less than the rated amount it is not necessary to discharge the extra oil from the system For the method used for additional oil charging after compressor replacement refer to 8 1 If Refrigerant Has Already Been Charged to Outdoor Unit Required equipment and tools Jumper wire with clips adjustable wrench set of manifold gauge valves refrigerant recovery unit pre purged refrigerant cylinder for recovery flat head screwdriver and outdoor unit maintenance remote controller This work is performed in order to collect the refrigerant from an outdoor unit where repairs other than compressor replacement will be performed into other outdoor units and indoor units and the refrigerant tubing 3 WAY VRF SYSTEM 9 Pumping Out Refrigerant from Outdoor Unit DROP Vi ger RDIR 9 1 If Remote Controller CZ RTC2 is Used for Maintenance of Outdoor Unit 1 Refer to 4 Backup Operation and perform backup operation 2
57. alarm The alarm history is indicated by the alarm code If there have been no alarm codes is displayed To clear the alarm history press the button The outdoor unit alarm history will be cleared To exit press the CHECK button The display returns to the normal remote controller display 3 WAY VRF SYSTEM 6 Mode Settings Outdoor Unit Maintenance Remote Controller E Setting mode 1 Display of first 4 digits lt Operating procedure gt Press and hold the CHECK button and ST VENTILATION button simultaneously for 4 seconds or longer Use the temperature setting Ca and buttons to change the item code The item codes and setting data are shown in the table below Use the timer time 4 and 7 buttons to change the setting data To confirm the changed setting data press the button At this time Band stops blinking and remains lit During this mode is displayed blinking The outdoor unit address display section displays ALL the item code number DN value in the table and the setting data 8 digits The setting data is displayed in 8 digits The display changes between the first 4 digits Fig and the last 4 digits Fig When the first 4 digits are displayed the bottom dot of the colon is lit To exit the setting mode press the CHECK button A and are displayed alternately Example shows display of 0000 0001 0 Se
58. ant Tubing Between Indoor and Outdoor Units Refer to the Installation Instructions that came with the outdoor unit 3 WAY VRF SYSTEM 7 Evacuating System Outdoor Unit Repair Procedures This procedure is carried out to ensure there is no remaining refrigerant or other gases nitrogen etc in the repaired outdoor unit and tubing 7 1 Evacuating Repaired Outdoor Unit 1 Check that each service valve of the suction tube discharge tube liquid tube and balance tube in the outdoor unit are fully closed 2 Connect the manifold gauge valves to the high pressure and low pressure sensor outlets of the outdoor unit Fig 2 13 3 Connect the manifold gauge valves to the vacuum pump If the AP pins CN102 on the outdoor control PCB have already been short circuited step 4 is not necessary 4 Turn off power to the repaired outdoor unit and short circuit the AP Air Purge pins on the outdoor control PCB By short circuiting the AP pins and turning on power to the outdoor unit all exon electronic valves in the outdoor unit are forcibly opened and any remaining nitrogen gas can be recovered Failure to perform this procedure may result in nitrogen gas remaining in the refrigerant circuit and causing operating problems Therefore never skip this step 5 Turn the power ON at the outdoor unit where vacuum will be applied Then run the vacuum pump and continue evacuation until the vacuum condition falls to less than 14 7
59. at you carry out this step Carry out refrigerant recovery T To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit TE db D D Manifold EA FASE Va mg Refrigerant High pressure outlet port For 5 16 7 94mm dia connector recovery unit Refrigerant recovery cylinder Low pressure outlet port For 5 16 7 94mm dia Fig 2 9 connector 3 WAY VRF SYSTEM Ly Recovering Refrigerant Outdoor Unit Repair Procedures 5 2 Refrigerant Recovery Procedures Indoor Unit The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the indoor unit due to trouble in the refrigerant circuit START 5 2 1 Cooling operation for all units its Ball valve is provided in the indoor unit 5 2 3 Refrigerant recovery Turn off all equipment in system YES NO procedures 2 5 2 2 Refrigerant recovery Replace or repair faulty unit procedures 1 Check for leakage in repaired unit Turn off all equipment in system Charge refrigerant in repaired unit Evacuate air from repaired unit When replacing or repairing a faulty unit let other normal indoor units run excluding indoor unit where refrigerant is recovered Amount of charge should equal that YES recovered by refrigerant recovery unit Power can independently b
60. ber of inverter compressors is also small Therefore the compressors may operate at a high frequency even when the load is not large 2 Sequential operation beginning from unit No 1 By using the outdoor unit maintenance remote controller to change the outdoor unit EEPROM settings it is possible to start the units in sequence beginning from unit No 1 For information concerning EEPROM settings refer to the field application functions 3 WAY VRF SYSTEM 3 Compressor Control Control Functions 3 3 Compressor Capacity Control The compressor operating conditions vary depending on the indoor unit operating conditions and on the effects of indoor heat load outside temperature and other factors Unit No 1 CCU calculates the required capacity according to these operating conditions and allocates the capacity requirement among the outdoor units according to the compressor start stop rules Fine adjustments to system capacity control are made by the inverter compressors Depending on the conditions all inverter compressors may be operating for fine adjustment 3 4 Inverter Compressor Capacity Control 1 The inverter compressor has a center limit value and upper limit value for the operating frequency These limits are set for each outdoor unit capacity 2 The inverter frequency during operation may be lower than the frequency listed above due to overload current protection control In this case the inverter frequency lower limit
61. ce purpose and type when changing the settings Incorrect settings may result in malfunction e Do not change any setting data that does not appear in this list 2 Detailed Settings Function e This allows the system address indoor unit address and other settings to be made for the individual or group control indoor unit to which the remote controller used for detailed settings is connected When detailed settings mode is engaged operation stops at the individual or group control indoor unit where the remote controller used for detailed settings is connected Simple settings items can also be set at this time lt Procedure gt Press and hold the A and buttons simultaneously for 4 seconds or longer Ba unit No l f or AL I in the case of group control item code TH and settings data DU XX are displayed blinking on the remote controller LCD display Fig 4 2 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating Q If group control is in effect press the button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating 4 Press the temperature setting Ca Cv buttons to select the item code to change Press the timer time 4 buttons to select the desired setting data For item codes and setting data refer to the followin
62. cessary 10 Remove the manifold gauge The connecting port employs a Schrader type push to release valve When Nezey disconnecting the hose pressure will be applied from the refrigerant in the outdoor unit 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures 10 2 2 Replacing all compressors in a failed unit 1 2 3 Nm 10 N 11 xN Follow the instructions in 3 Discharging Compressor Oil and drain the oil from the oil separator in the failed unit Measure the amount of drained oil If backup operation is required follow the instructions in 4 Backup Operation and engage backup operation Follow the instructions in 10 3 Removing and Installing Compressors and replace all compressors in the failed unit Fully close the high and low pressure gauge valves on the manifold gauge then stop the vacuum pump Disconnect the manifold gauge from the vacuum pump Connect the manifold gauge to the refrigerant cylinder At this time be careful that air does not enter the tubing Nezen Do not reuse the recovered refrigerant Use a refrigerant cylinder that contains new refrigerant Open the valve on the refrigerant cylinder and open the high pressure gauge valve on the manifold gauge with the low pressure gauge valve closed When charging has been completed with an amount of new refrigerant equal to the amount of recovered refrigerant or when charging with the same amount of
63. ch unit contains an inverter compressor Therefore the inverter which operates is the inverter with the shortest amount of operating time After the first inverter compressor has started the remaining inverter compressors and constant speed compressors start operating in order of the compressors which have the shortest amount of operating time Immediately after installation all compressors have an operating time of zero In this case the compressors start in the following sequence Inverter compressor gt Constant speed compressor lt Details gt The A C units are selected with consideration for the maximum load Therefore in most cases the maximum capacity is not required Ordinarily the operating range of an inverter compressor is approximately 25 Hz 90 Hz however operating efficiency declines somewhat in the high frequency operating range With consideration for these characteristics control of inverter compressors in this system is divided into two ranges according to the frequencies Ordinarily for reasons of efficiency the upper limit for operation is approximately 50 Hz If greater capacity is required the next compressor is started When all compressors are operating and greater capacity is required the inverter compressors are operated at frequencies above approximately 50 Hz This control may increase the lifetimes of the inverter compressors and refrigerant oil If the number of connected outdoor units is small the num
64. compressor 2 are operating and the fan mode is 14 maximum fan speed then the high pressure saturation temperature should be approximately 30 F above the outdoor air temperature If it is 10 F or more above this level then it is possible that over charging may have occurred During heating There is an indoor unit where refrigerant flow is poor E1 temperature and discharge temperature are low and the mechanical valve of that unit is opened to 300 pulses or more and the E1 temperature is close to room temperature However be aware that this kind of data results often when there is a height difference between indoor units Reducing the amount of refrigerant will improve the refrigerant flow however reducing it too much will increase the likelihood of alarms related to low oil level Scroll side the low pressure SW and discharge temperature Use caution Example This alarm may result when the service valve is closed or when valve leakage particularly from the mechanical valve occurs F17 Alarm Low pressure sensor trouble 1 Sensor short circuit 2 Sensor open circuit 2 PCB malfunction Check 1 Measure the sensor resistance Check that the sensor is operating normally 2 Use a remote monitor or a PC monitor to check the temperature that is recognized by the microcomputer Notes F31 Alarm Alarm code Outdoor unit non volatile memory EEPROM trouble Alarm conditions Non volatile memory is not present when power ini
65. covery from this alarm occurs automatically when the set outdoor unit quantity matches the number of outdoor units detected on the outdoor unit main sub control wiring E29 Alarm ege Ve Outdoor unit failed to receive communication from outdoor unit main Alarm conditions Outdoor unit communications from outdoor unit main were interrupted for 3 minutes or longer Probable cause 1 After initial communications were completed the outdoor unit main sub control wiring was cut After initial communications were completed the RC connector became disconnected The power at the outdoor unit main unit is turned OFF Check the outdoor unit main sub control wiring Check the RC connectors 2 3 Check 1 2 3 Check the power at the outdoor unit main 1 2 3 Correction Repair the outdoor unit main sub control wiring Correct the RC connector connection Turn ON the outdoor unit main power Example 19 O Notes e O 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis F04 F05 Alarm Alarm meaning Compressor 1 discharge temperature sensor trouble compressor 2 discharge temperature sensor trouble Alarm conditions 1 Discharge temp of 212 F or higher was detected 20 minutes or more after that compressor stopped operating 2 Discharge temp of 176 F or higher was detected after all compressors had been stopped for 60 minutes or longer 3 A D step is 10 steps or less short circuit Prob
66. ctronic control valve connector The connector is normal if all results pin 5 pin 1 pin 5 pin 3 pin 6 pin 2 pin 6 pin 4 are approximately 460 If the results are OQ or replace the coil 3 Crank case heater e Connect a clamp meter to 1 of the 2 crank case heater wires and measure the current The current is normal if the result is 0 15 A or higher As a guide the current should be 0 14 A 180 V 0 17 A 220 V 3 WAY VRF SYSTEM 7 Test Pin Trouble Diagnosis When the test pin on the outdoor unit control PCB is short circuited each part can be operated individually e After turning OFF the main unit power short circuit the test pin CN022 WHT then turn the power back ON Output is performed in the sequence shown in the table below for 0 5 seconds each Output Operation Output Operation Supercooling valve 1 SCV1 8 Relay RY022 Pressure balance valve 1 PBV1 Supercooling valve 2 SCV2 9 Relay RY017 Refrigerant balance valve RBV Discharge valve 2 DCV2 Refrigerant adjustment valve RCV Discharge valve 1 DCV1 Save valve SAVE Bypass valve BPV Pressure balance valve 2 PBV2 6 Relay RY007 Recovery valve ORVR Crank case 2 CH2 Balance valve BALV Crank case 1 CH1 3 WAY VRF SYSTEM 8 Thermister Characteristics Curve Trouble Diagnosis 8 1 Room temp sensor Temperature sensor NG bk D Do o e Resistance KQ gt ml Temperature
67. d indoor unit air intake temperature is ignored and areas B and C are considered to be area A for control purposes This is used for additional charging test run checks etc For this reason vapor may be discharged if the test run continues for a long period of time however this does not indicate a problem In addition the test run is canceled automatically after 1 hour 2 Even within the same area the compressor capacity varies depending on the refrigerant temperature 3 For 6 minutes after the compressors start area C is considered to be area B for control purposes 4 During special control control of the compressor capacity according to Te is not performed 5 If the thermostat turns OFF while Te is within area C the next time the compressor starts it may restart froma lower capacity 6 When the area changes to area C area C is considered to be area B for control purposes for the first 6 minutes even if the horsepower is the minimum value within the range where capacity control is possible operation with inverter frequency of 25 Hz only Subsequently if C area continues the thermostat turns OFF 3 WAY VRF SYSTEM 3 Compressor Control Control Functions 3 6 2 Condensation Temperature Tc Control Control when there are indoor units operating in Heating mode PX 125 6 F Thermostat OFF Area D PX 0 1 Horsepower decrease Area C 118 5 118 4 118 4 Horsepower increase prohibited Area B gt 11
68. d wire when pulling out the connector Removing any other connector may not cause the units to stop Therefore be sure to pull out the SCT connector only It is not necessary to recover the refrigerant from the balance tube Therefore do Nezen not operate the balance tube valve Turn off power to all equipment in the system Then pull out the RC1 connector 4P BLU CN106 on the outdoor control PCB in the outdoor unit for which pump down has been completed By pulling out the RC1 connector communication between the main and the sub outdoor units will be isolated Change the setting of controllable outdoor unit numbers reduce by 1 unit If the setting is incorrect the E30 alarm outdoor unit serial communication signal error occurs and the unit will not operate Turn on power for all equipment in the system and let the remaining outdoor units run in Cooling mode Repeat steps 1 through 7 and complete pump down for all outdoor units 2 12 3 WAY VRF SYSTEM 5 Recovering Refrigerant Outdoor Unit Repair Procedures Using hoses with Schrader type push to release valves connect the manifold gauge valves to the suction line service port the discharge line service port and the liquid line service port in the next outdoor unit to undergo pump down Fig 2 11 Remaining refrigerant in the system may cause internal pressure Check that each eer valve on the manifold gauge is tightly closed A Schrader type push to releas
69. dual air conditioners If a single unit of the multi air conditioner system is to be installed in a small room select a suitable model and installation procedure so that if the refrigerant accidentally leaks out its density does not reach the limit and in the event of an emergency measures can be made before injury can occur e Do not touch the air inlet or the sharp aluminum fins of the outdoor unit You may get injured Ventilate any enclosed areas when installing or testing the refrigeration system Escaped refrigerant gas on contact with fire or heat can produce dangerously toxic gas Confirm after installation that no refrigerant gas is leaking If the gas comes in contact with a burning stove gas water heater electric room heater or other heat source it can cause the generation of poisonous gas J N Cenarion Others J N Cenarion sharp aluminum fins of the outdoor unit You may get injured Do not sit or step on the unit you may fall down accidentally Do not stick any object into the FAN CASE You may be injured and the unit may be damaged ASHRAE and the International Mechanical Code of the ICC as well as CSA provide guidance and define safeguards related to the use of refrigerants all of which define a Refrigerant Concentration Level RCL of 25 pounds per 1 000 cubic feet for R410A refrigerant For additional guidance and precautions related to refrigerant safety please refer to the following docu
70. e accumulator KI Refrigerant on the outer side evaporates cooling the liquid refrigerant on the inner side Liquid refrigerant Electronic control valve 4 large SC expansion valve controls the flow 2 Operation when discharge temperature is high When the discharge temperature increases the SC circuit electronic control valve opens to 480 pulses This intentionally causes a mild liquid back up cooling the compressor This operation takes priority over operation intended to increase SC It is performed at top priority in all operating modes o T Liquid refrigerant Liquid refrigerant returns to the accumulator i I Does not fully evaporate resulting in liquid back up Liquid refrigerant e Electronic control valve 4 opens to 480 pulses 3 WAY VRF SYSTEM 8 Outdoor Fan Control Control Functions 8 1 Fan mode These outdoor units utilize a DC fan motor that can be controlled in a maximum of 16 steps 16 modes However fan modes 15 and 16 can only be used if high static pressure mode has been set For information concerning EEPROM settings refer to the field application functions 8 2 Outdoor Fan Min Fan Mode and Max Fan Mode LI Min fanmode Max fanmode Coolina operation Outdoor air temp gt 59 F 1 alld Outdoor air annie Sn S00 FO EE E Even if the fan mode is 0 during cooling operation the fan mode may change to 1 at regular intervals for temperature protection of the inverter h
71. e turned Modify power to permit turning off off for indoor unit where refrigerant is power to refrigerant recovered recovered indoor units independently Ready for operation Change controllable number of indoor END units including changes in group control and integrated control settings Other indoor units can operate normally Replace or repair faulty unit Check for leakage in repaired unit x Evacuate air from repaired unit x Replace or repair faulty unit Check for leakage in repaired unit x Charge refrigerant in repaired unit x Amount of charge should equal that recovered by refrigerant recovery unit Evacuate air in repaired unit x Charge refrigerant in repaired unit x Change controllable number of indoor units including changes in group control and integrated control settings Amount of charge should equal that recovered by refrigerant recovery unit Open ball valve Open the ball valve Ready for normal operation Ready for normal operation Service work performed on indoor units is done simultaneously using the service ports at the liquid narrow tube side and the gas wide tube side ball valves Refer to each section in the Installation Instructions on refrigerant charging leak checking and evacuation procedures 3 WAY VRF SYSTEM 5 Recovering Refrigerant Outdoor Unit Repair Procedures 5 2 1 Cooling operation for all units 1 If the remote controller CZ RTC2 is used for maintena
72. e upper side valve and connect it to the vacuum pump via the manifold gauge valves as shown below Run the vacuum pump and evacuate the tank until the pressure falls to below 14 7 psig 5 Torr for the evacuation drying After the evacuation drying is finished fully close the upper valve Next fully close the manifold gauge valves and stop the vacuum pump To ensure proper evacuation refer to the operating instructions that came with the vacuum pump Open to run then close to sto p Manifol anifold gauge Upper side Lower side valve Fig 2 15 3 WAY VRF SYSTEM 8 Charging Compressor Oil Outdoor Unit Repair Procedures 2 Charging compressor oil into oil charging tank Connect a piece of pipe to the lower valve and then insert the other end deeply into the bottom of the oil container Make sure you avoid letting any air be sucked into the tube Next run the vacuum pump and open the manifold gauge valves then open the upper and lower valves to begin charging oil into the charging tank First close the lower and then this one before stopping Manifold gauge Fig 2 16 When the predetermined amount of oil has been charged into the oil charging tank immediately close the lower valve and start the vacuum pump to reduce the pressure below 14 7 psig 5 Torr Then close the upper valve and stop the vacuum pump Do this operation quickly because compressor oil easily absorbs moisture exon from the a
73. e valve is provided for each connection port Use hoses to connect the manifold gauge valves refrigerant recovery unit and refrigerant recovery cylinder Quickly connect each part to prevent air from entering the tubing Recover remaining refrigerant from the inter unit tubing and indoor units using the refrigerant recovery unit To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit Discharge tube service port For 5 16 7 94mm dia connector Liquid tube service port For 5 16 7 94mm dia connector Manifold gauge Lo Hi IE ag Me bi TARF By f i 4 Ia Ser a Sr DE SE E I hi I Kg Refrigerant lr i S recover unit Refrigerant recovery cylinder Suction tube service port For 5 16 7 94mm dia connector Fig 2 11 5 3 Recovery of Refrigerant from Entire System 1 Turn off power to the entire outdoor system 2 Short circuit the AP Air Purge pins CN102 on the outdoor control PCB of all outdoor units then supply power to the outdoor units By short circuiting the AP pins and supplying power to the outdoor units the solenoid valve in each unit is forcibly opened and all remaining refrigerant can be recovered 3 If any unit has encountered a power failure follow the instructions in 5 1 Refrigerant Recovery Procedures from Outdoor Units and perform refrigerant recovery for the
74. ections and inadequate grounding can cause accidental injury or death e Ground the unit following local electrical codes e Connect all wiring tightly Loose wiring may cause overheating at connection points and a possible fire hazard e To prevent possible hazards from insulation failure d the unit must be grounded When Transporting Be careful when picking up and moving the indoor and outdoor units Get a partner to help and bend your knees when lifting to reduce strain on your back Sharp edges or thin aluminum fins on the air conditioner can cut your fingers When Installing a eseeseeseeseeseesesseeseesesseeseesesseesessessessesssssessesseseeseesseseeseesses Select an installation location which is rigid and strong enough to support or hold the unit and select a location for easy maintenance Ina Room Properly insulate any tubing run inside a room to prevent sweating that can cause dripping and water damage to walls and floors Keep the fire alarm and the air A N outlet at least 5 feet away from the unit In Moist or Uneven Locations Use a raised concrete pad or concrete blocks to provide a solid level foundation for the outdoor unit This prevents water damage and abnormal vibration In an Area with High Winds Securely anchor the outdoor unit down with bolts and a metal frame Provide a suitable air baffle In a Snowy Area for Heat Pump type Systems Install the outdoor unit on a ra
75. ed again operation is started after the alarm is cleared During this operating mode CHECK flashes on the wired remote controller only to inform the user that operation is in backup mode However this is not displayed on any other control devices e In order to cancel automatic backup mode it is necessary to reset the power on the control PCB of the outdoor unit where the outdoor unit No setting S007 on the control PCB is set to No 1 main unit Nezen If the power is not reset on the control PCB of the No 1 outdoor unit main unit backup mode operation will continue after the repairs are completed Backup operation is intended as emergency operation until repairs are made Have repairs made as soon as possible 4 2 Manual Backup This backup operation is the conventional method of backup operation It involves disconnecting the failed outdoor unit from the system and operating only the normal outdoor units 4 2 1 Backup operation by disconnecting the outdoor unit 1 Changing the outdoor unit control PCB settings lt If the failed outdoor unit is not the No 1 unit gt e Settings at No 1 unit main unit No of outdoor units 5006 Subtract the number of failed units from the current setting Outdoor unit No S007 No change e Settings at normal outdoor units other than the No 1 unit No particular changes e Settings at the failed outdoor unit No particular changes However close all service valves Sucti
76. efrigerant recovery unit is necessary Follow these procedures to correctly perform pump down Perform work correctly according to the work procedures given below Connect the manifold gauge to the high and low pressure outlet ports on the outdoor unit where pump down will be performed Be sure that no air enters the tubing at this time Q Fully close the discharge tube valve on the outdoor unit where pump down will be performed 3 Follow the instructions in 5 2 1 Cooling operation for all units and operate all units in Cooling mode for approximately 5 minutes Then fully close the liquid tube valve on the outdoor unit where pump down will be performed 4 When the high pressure gauge reaches 406 1 psi or higher or the low pressure gauge reaches 72 5 psi or below at the outdoor unit where pump down is being performed press the ON OFF button on the outdoor unit maintenance remote controller to stop operation at all units Then immediately fully close the suction tube valve on the outdoor unit where pump down is being performed If the outdoor unit maintenance remote controller is unavailable follow the procedure below to stop all of the units Pull out the SCT connector 2P YEL CN231 on the outdoor unit control PCB of the unit where pump down is being performed When the SCT connector is pulled out immediately alarm F12 sensor trouble occurs and all outdoor units stop operating Be sure that you do NOT grasp the lea
77. ehand at power mains Fully close each service valve on the suction tube discharge tube liquid tube and the balance tube of the outdoor unit Connect the outdoor unit s high pressure and low pressure outlet ports with the Hi and Lo sides of the manifold gauge valves using hoses Fig 2 9 The remaining refrigerant in the faulty outdoor unit may create internal Nezen pressure Before connecting hoses be sure to confirm that each of the manifold gauge valves is tightly closed Note that the connection ports employ Schrader type push to release valves Connect the manifold gauge valves refrigerant recovery unit and recovery cylinder using hoses To avoid the entry of air into the refrigerant tubing carry out this connection work carefully Fig 2 9 For detailed procedures such as connecting the refrigerant recovery unit Jare with the recovery cylinder and methods used for recovery follow the specific instructions that came with the refrigerant recovery unit Locate the AP Air Purge pins on the control PCB in the faulty outdoor unit and short them using the clips of the jumper wire Then restore electrical power to the outdoor unit By short circuiting the AP pins each solenoid valve in the outdoor unit is N CAUTION forcibly opened as soon as power comes on which releases all remaining refrigerant into the recovery cylinder Since neglecting this procedure may leave some refrigerant in the system it is important th
78. emand meaning Contact 1 Contact 2 SN Operates to maximum No limit capacity Demand can be set from 40 130 at Current is limited to the set EEPROM 1B values d Demand can be set from 40 130 at Current is limited to the set EEPROM 1A values ox fo 3 WAY VRF SYSTEM 19 Other Functions Control Functions 19 1 Snowfall Sensor Functions Outdoor EEPROM 04 A unit identified as having a snowfall sensor attached will periodically send a signal indicating the snowfall sensor input status to all outdoor units in the same system or all wired outdoor units in the case of linked systems It is therefore unnecessary to install and wire multiple snowfall sensors 1 Snowfall sensor settings If the snowfall sensor is used then depending on the circumstances it is necessary to make the correct setting at all outdoor units in the system If control is not performed is set control by the above signal is ignored This setting is used in order to conserve energy at outdoor units that include a snowfall protection hood Recommended If a low speed fan mode is required for all year cooling or other reasons install a snowfall protection hood and set this setting to ON 2 Control operation 1 Outdoor units where sensor input present is set send the snowfall sensor input information every 10 minutes to all linked systems if the system wiring is linked 2 At systems where control is performed is set
79. en the outdoor unit heat exchanger is functioning as a condenser When the valve determines that there are signs of a low refrigerant level refrigerant is supplied from the receiver tank to the system 1 The OFF conditions take priority over the ON conditions for this valve 2 This valve is OFF when the outdoor unit is stopped 3 This valve is ON when special control is in progress 4 Control during normal operation A Cooling operation amp This valve turns ON when symptoms of insufficient refrigerant gas occur at an indoor unit amp This valve turns ON when the outdoor air temperature is 59 F or below Under these conditions the high pressure is low and refrigerant flow becomes poor amp This valve turns OFF when symptoms of refrigerant overcharge are detected at the outdoor unit B Mixed cooling heating operation Fei The RCV turns ON at stopped outdoor units when the heat exchanger at another outdoor unit is functioning as a condenser Hp 6 2 Refrigerant Balance Valve RBV Gas Purge Valve The main purpose of this valve is to detect the flow of refrigerant refrigerant volume on the indoor unit side when the outdoor unit heat exchanger is functioning as an evaporator When the valve determines that there are signs of excess refrigerant refrigerant is recovered at the receiver tank This valve is ON during heating operation and when the outdoor unit heat exchanger is functioning as an evaporator d
80. er when they are engaged operation is in Quiet mode 24 hours a day Selecting a Quiet mode results in operation that gives priority to reducing noise Because these modes involve restrictions on outdoor unit fan modes and the operation frequency the capacity will be somewhat reduced Normal operation setting at time of factory shipment Noise reduced by approx 1 2 dB from the catalog value Approx OSN o 14 Noise reduced by approx 2 3 dB from Approx 1 2 hp the catalog value 3 10 Noise reduced by approx 5 dB from the Approx 1 8 hp catalog value If Quiet mode is set the capacity will begin to decrease during heating operation at low outdoor temperatures when the outdoor air temperature is below standard conditions It is possible to set Quiet mode only for nighttime by using the snowfall sensor input terminal and a timer for quiet operation In this case operation is the Quiet mode determined by the above setting 18 2 Slime Countermeasure EEPROM OG set only on the main unit This setting controls the operation of the drain pump aa eem o Normal cont eting tne oreo sionen 18 3 Delayed Start for Each System Outdoor EEPROM 3E set only on outdoor unit No 1 The operation start time can be delayed according to the set system addresses This setting reduces the voltage drop by preventing multiple systems from starting at the same time when operation is restarted after multiple operating sys
81. erature shift i 0001 Shifts intake temperature by 2 F 0009 Shifts intake temperature by 18 F 0010 Shifts intake temperature by 20 F Automatic 0000 Function disabled stop time 0001 Stops automatically 5 minutes after operation starts Sen 0002 Stops automatically 10 minutes after operation starts 0123 Stops automatically 615 minutes after operation starts 0124 Stops automatically 620 minutes after operation starts 0125 Stops automatically 625 minutes after operation starts 4 5 address 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions Description 00 gt gt gt bm o Dee Cooling discharge 008 emperature shif os er 0 Heating discharge temperature shift 0010 0001 Temperature shift for 0002 cooling heating change in 0003 IZ 0007 0018 64 F Lower limit at shipment 0019 0029 0030 86 F Upper limit at shipment 0016 O F Lower limit at shipment 0017 F Upper limit pa LI K Lower limit w L l Upper limit NO a ot LL 0029 F 0030 6 F Upper limit at shipment 0018 64 F Lower limit at shipment 0019 6 F Lower limit Change to remote control temperature setting range Upper limit I Lt Lower limit F 6 F Upper limit at shipment 2 F Lower limit at shipment 4 F 003 001 001 O CO CO OD CO CO OD gt gt
82. ess and servicing monitor HD XX sensor temperature are displayed on the remote controller LCD display See Fig 4 4 at right 3 Press the temperature setting a ily buttons and select the item code to the address of the sensor to monitor For the relationships between the sensor ddresses and sensor types refer to the table of UMEN S Le In case for example the display shows 0185 in temperature sensors and addresses on the next the figure above a discharge temperature from the page outdoor unit stands for 1859F If group control is in effect press the Fig 4 4 button to select the unit to monitor Press the temperature setting buttons to select the item code to change NOTE The temperature display appears as for units Press the button to return to normal remote Pee ener dene If monitor mode is engaged while normal operation is in progress only the parts of the LCD display shown in the figure will change Other parts continue to display the same information as during normal operation CZ RTC2 Display shows a discharge temperature of 00XX at 3 WAY VRF SYSTEM 3 Remote Controller Servicing Functions Remote Controller Functions Outdoor unit sensors Indoor unit sensors Uniinoi untwo2 08 8 Discharge temp 2 i toes sc rer L or Lx i ww e
83. essor and reinstall the removed constant speed compressor in the outdoor unit 3 WAY VRF SYSTEM Contents Outdoor Unit Maintenance Remote Controller 3 OUTDOOR UNIT MAINTENANGE REMOTE CONTROLLER TL e a 3 2 2 le de EE 3 3 3 Ordinary Display Controls and Functions 00 02 c eee eee eee 3 4 4 Monitoring Operations 000 es 3 9 5 Outdoor Unit Alarm History Monitor 0202 es 3 11 6 Mode SGUINGS EEN 3 12 3 WAY VRF SYSTEM 1 Overview Outdoor Unit Maintenance Remote Controller OUTDOOR UNIT MAINTENANCE REMOTE Service Checker Section CONTROLLER CZ RTC2 for 3 WAY VRF HM About the outdoor unit maintenance remote controller The outdoor unit utilizes nonvolatile memory EEPROM on its PCB This allows EEPROM data to replace the setting switches that were present on previous PCBs The outdoor unit maintenance remote controller is used to set and change these EEPROM data In addition to setting and checking the outdoor unit EEPROM data this remote controller can also be used to monitor the outdoor unit alarm history monitor the various indoor and PROGRAM outdoor temperatures and check the indoor unit connection COPY status number of units operating mode etc a O DES SS Outdoor unit maintenance remote controller does not function as an ordinary remote controller It is therefore only used for test runs and CZ RTC2 during servicing
84. essor high frequency overcurrent alarm Inverter compressor missing phase or lock alarm 5 26 Blinking Inspection Display on the remote CHECK blinking 1 controller CHECK blinking 2 dal bu NIDS NI 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis E06 Alarm Alarm meaning Outdoor unit failed to receive serial communication signals from indoor unit Alarm conditions Outdoor unit failed to receive serial communication signals from indoor unit Probable cause 1 The indoor unit power was cut OFF after initial communications were completed 2 An open circuit or short circuit occurred in the inter unit control wiring after initial communications were completed Check the power at the indoor and outdoor units and check the inter unit control wiring Correction S S O Example 19 Notes This alarm is detected after initial communications are completed Therefore it does not occur in cases of disconnected serial connector no terminal unit set or other trouble that occurs before initial communications are completed If initial communications have not been completed alarm E04 occurs E12 Alarm gemeng EHR Automatic address setting start is prohibited Alarm conditions Automatic address setting was started when automatic address setting was in progress at another outdoor unit in the same link Probable cause Automatic address setting is in progress at another outdoor unit Check This alarm is
85. ettings again Correct the system address settings Exampe 19 S O Notes Recovery from this alarm occurs automatically when communication that contains the same address as that unit is not received for 3 minutes after detection L10 Alarm Outdoor unit capacity not set Alarm conditions The outdoor unit capacity has not been set or the setting is not allowed by the system Probable cause This alarm occurs because the capacity has not been set Check Connect the outdoor unit maintenance remote controller On the outdoor unit EEPROM detailed setting mode screen check the value for the outdoor unit capacity item code 81 Check that it is not set to 0 or to a capacity that is not allowed If item code 81 is incorrect use the outdoor unit maintenance remote controller and set it correctly After changing the setting be sure to reset both the indoor and outdoor power Example 19 O Notes The outdoor unit maintenance remote controller is required in order to set the capacity in the outdoor unit EEPROM L17 Alarm Outdoor unit model mismatch This alarm occurs when a unit other than a R410A refrigerant model is connected Probable cause 1 A unit that uses R407C refrigerant or a R22 model unit was connected by mistake 2 The connected unit is correct however the refrigerant type setting in the outdoor unit EEPROM item code 80 is incorrect Check 1 Check the refrigerant type at the connected unit 2 Use the outdoo
86. exagonal cap Oil equalizer tube connector parts Fixing nut at the main unit side Fig 2 26 3 Remove the oil equalizer tube connector parts along with the O ring from the removed compressor and mount them on the replaced new compressor 4 Install the crankcase heater onto the new compressor 5 Temporary mount 2 cushion rubbers with bolts at the position as shown in the figure 2 27 Set up the leg of the new compressor onto the 2 cushion rubbers LJ L E A Leg I Ki YTO vg Pi D VW i D Ar K wa ay S d eae Gah gt EE SS fer Cushion rubbers Bolts Temporary mounting 2 locations at back side each 1 piece Front view 10 Compressor I 3 3 WAY VRF SYSTEM Outdoor Unit Repair Procedures ae equalizer tube Vi faen LSK Ze VAS VE me Ge pr Po ee pg OD AT Ry m a MN ISS DE 1 AE dei 15 sc lt a gt EL Re I Eee l DE W d FU gt Brazing d ls locations 3 i E CT Ga plaq h i i i i Bolt I e Ve Washer 1 hte Rubber washer 1 A AP E gt L SH 1 each at the 3 locations w LA a CR e W SCH INN nm S Protect the oil d gt We Ss a d e GE Cushioning Front view Fig 2 28 Set the remaining cushioning rubber beneath the new compressor leg at the locations shown in the figure 2 28 Remove the bolts which are temporarily fastening the 2 pieces of cushioning rubber and anchor the
87. faulty outdoor unit 4 Connect the manifold gauge to the high and low pressure outlet ports Schrader type valves on any outdoor unit Fig 2 11 Remaining refrigerant may cause internal pressure Check that each valve on the N exon manifold gauge valves is tightly closed The connection port uses a Schrader type push to release valve 5 Connect the manifold gauge valves refrigerant recovery unit and refrigerant recovery cylinder Quickly connect each part to prevent air from entering the tubing 6 Check that each service valve of the suction line discharge line liquid line and the balance tube for the outdoor unit has opened then perform refrigerant recovery If only a single outdoor unit is installed the balance tube is not used Therefore leave this valve closed To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 2 13 3 WAY VRF SYSTEM 6 Checking for Leakage After Repair Outdoor Unit Repair Procedures 6 1 Pressure Check for Leakage of Outdoor Unit After completing repair of the outdoor unit carry out the following leakage check 1 Check that all service valves for suction tube discharge tube liquid tube and balance tube in the repaired outdoor unit are fully closed 2 Connect the manifold gauge valves to the high and low pressure outlet ports of the outdoor unit 3 Feed nitrogen gas into the circuit until 522 1 psi pressure
88. for control to 0025 Control temperature 77 F prevent cold air 0026 Control temperature 78 F x EP Fan output switching 0000 Output linked with fan ON when indoor unit fan is operating Automatic drain pump 0001 Fan mode operation output 0000 No delayed start 0001 1 sec delayed start 0002 2 sec delayed start start time 0000 Humidifier output OFF Drain pump stopped 0001 Humidifier output ON Drain pump operates Humidifier setting 0002 Humidifier output ON Drain pump operates for 1 minute when total humidifier operating time reaches 60 minutes 0003 Humidifier output ON Drain pump stopped FE 0000 Standard setting PoP 0001 Draft reduction mode Flap lower limit position is shifted upwards 0000 Smudging reduction mode Flap swing upper limit position is shifted downwards Flap swing mode 0001 Normal mode 0002 Draft reduction mode Flap swing lower limit position is upwards 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions i 4 Setting data em code No Description mode 0000 Standard Standard setting at shipment High ceiling use High ceiling setting 1 with standard panel 0001 For low Ultra long life filter oil guard panel ammonia deodorizing Fan tap setting static pressure filter filter optical regenerative deodorizing filter Fan tap change in order High ce
89. g page Press the button The display stops blinking and remains lit and setting is completed Press the button to return to normal remote controller display 3 WAY VRF SYSTEM Remote Controller Functions 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions List of Detailed Setting Items or Gode Setting data E ee E a 4 Way Cassette U1 Low Silhouette Ducted F ee Ve a 4 Way Cassette SC Y1 Ge Slim Low Static Ducted M 0006 High See eege 0007 Ceiling T1 0008 Wall Mounted K1 Ducted Concealed Floor 0010 j Foor Standing FT 9011 Standing R1 D 0001 2 Type 7 0003 28 Type 9 0005 36 Type 12 71 Type ech For S 24MP1U6 capacity 80 Type 24 0012 Except S 24MP1U6 0015 112 Type 36 0017 140 Type 48 S 24MR1 dl msn o 0001 Unit No 1 0002 Unit No 2 0003 Unit No 3 0030 Unit No 30 0099 Not set 0001 Unit No 1 0002 Unit No 2 Indoor unit 0003 Unit No 3 address Unit No 64 Not set 0000 Individual 1 1 Indoor unit with no group wiring Group control 0001 Main unit One of the group control indoor units address 0002 Sub unit All group control indoor units except for main unit 0099 Not set Shifts intake temperature by 20 F 009 Shifts intake temperature by 18 F Cooling Shifts intake temperature by 2 F eae 0000 No intake temp
90. g temperature monitoring is lit The display and operations are the same as when monitor mode is started from the unit remote controller Press the UNIT button and select the indoor unit to monitor Use the temperature setting and buttons to select the item code of the temperature to monitor The selected indoor unit No and the temperature data are displayed To end monitoring press the CHECK button The display returns to the normal display VIe The display does not blink 3 WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller DORIS o ei a ee ET grunt jC 4 3 tr _ ile em 3 iD Gy 3 WAY VRF SYSTEM 4 Monitoring Operations Outdoor Unit Maintenance Remote Controller M Display of unit No 1 main unit ET 7 le Smsm BEE 77 Dsemargetempsemng Jr OR indoor unteeeroneconralvave posten ster O C DA bsmargetempt Jr db oaeen fa BE Ugen Je oO O T Cod hemener e BE hemener o gt Coe heatechangergase o 47 haon w 7 Ousoorartemp Ce Deng O S SN a Ca fo h oor i wono e 6 wovepuse fe 17 bsmrgenms Jr gt gen OoOo h o 19 wovapue e i wovepuse fee db heatecnangergst o dr heatecnangeriquds fa id owpressuresenseremp e S E hocsmeremp
91. hanger is discharged The representative valves to check are the liquid valves and mechanical valves 3 Outdoor unit PCB failure e The check items are the same as for a high pressure sensor malfunction A normal PCB is needed to determine whether the problem is a PCB failure or a pressure sensor malfunction If an abnormality was found at the check items for a high pressure sensor malfunction first try replacing the PCB and check again Trouble is corrected Outdoor unit PCB failure Trouble is not corrected High pressure sensor malfunction N eS eee ee eo re Check Continued 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis Correction 1 Replace the high pressure sensor Caution Because the high pressure sensor connection employs a Schrader type valve it can be removed and replaced However the high pressure sensor can be easily damaged by high voltage therefore use sufficient caution with regard to static electricity 2 Replace the PCB 3 Correct the locations of problems in the refrigeration cycle e Correct locations where clogging or leakage has occurred In the case of over charging recover refrigerant Adjust the amount of refrigerant Guide for over charging Be sure to connect the gauge to the high pressure outlet when checking for over charging During cooling The following does not apply when outdoor air temperature is low or when fan speed is controlled When both compressor 1 and
92. her the outdoor unit heat exchanger is clogged Remove any foreign material that prevents ventilation During cooling check whether an air short blockage has occurred in the outdoor unit The system is operating normally unless the temperature around the outdoor unit is excessively high During cooling check for outdoor fan failure Check whether the screws securing the fan are loose and whether the fan connector in the outdoor unit PCB is properly connected During heating check whether the air filters in the indoor unit are clogged If clogged clean the filters During heating check whether an air short blockage has occurred in the indoor unit The system operates normally unless the temperature around the indoor unit is excessively high During heating check for indoor fan failure Check whether the refrigerant circuit is clogged Check that all service valves are closed Check whether welded locations are clogged 10 Check for mechanical valve failure Check whether the mechanical valves make a clattering sound when the power is reset Since the mechanical valve in the indoor unit is in a location that makes aural inspection difficult use an electric means to check Check that the connector pin of the mechanical valve on the PCB outputs 4 V In addition check that the coil resistance of the mechanical valve is several tens of Ohm Q 11 Check for solenoid valve kit failure Removing a coil that is on will result in a clicking sound Al
93. iling setting 2 with standard panel to prevent drop in air Antibacterial high performance filter 90 discharge caused by For low Antibacterial high performance filter 65 filter installation static pressure filter Air cleaning unit air cleaning unit optical regenerative deodorizing filter deodorant activated charcoal filter a aI OcKIng For 3 way discharge when discharge duct is connected material pode VEER For 2 way discharge material 0000 No humidifier output 0001 Humidifier ON time 2002 seconds 0058 0059 Continuously ON Function disabled Function enabled Function disabled prohibit Function enabled 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions Simple setting items Filter sign ON time setting Changes the indoor unit filter lifetime when a high performance filter or other filter lifetime optional product is installed Degree of titer foulin Reduces the filter sign ON time to 1 2 of the standard time setting at the time of g H shipping for cases when filter fouling is more severe than normal Filter sign ON times for each model Filter sign ON time Sues High High Standard Long life H performance performance Model at life 55 F Pressure data differential 0000 1 Way Cassette D 4 Way Cassette U1 4 Way Cassette SE Y1 oe Low Silhouette Ducted F1 Slim Low Static Ducted M1 0007 Ceiling T1 T1 x EY 1250 En ETER ERR ER ER ER B
94. in effect press the button to change to the unit you wish to monitor Press the CHECK button to return to normal remote controller operation lt Note gt The temperature display for units that are not connected appears as f monitor mode is engaged during ordinary operation the only parts of the LCD display that change are those shown in Q in the figure The other parts remain unchanged during normal operation 3 WAY VRF SYSTEM Trouble Diagnosis rine L CODE No CZ RTC2 i Unit No uf Hem code sensor address DD XX Discharge temp TD 3 WAY VRF SYSTEM 3 Remote Controller Servicing Functions Trouble Diagnosis Sensor Temperature Relationship Table Location where sensor Sensor EE Sensor Sensor nine is installed address yp address Ha l l H Remote controller temperature Discharge temperature sensor Indoor unit intake temperature Indoor unit heat exchanger Indoor unit electronic expansion temperature E1 valve position Indoor unit heat exchanger temperature E3 Unit Unit Unit Unit No 1 No 2 No 1 No 2 Discharge temperature 1 Outside air temperature Discharge temperature 2 CT2 High pressure sensor temperature Low pressure sensor temperature Outdoor unit Heat exchanger gas 1 Detected reservoir tank temp Heat exchanger liquid 1 Detected oil temp 1 Heat exchanger gas 2 Detected oil temp 2 Heat exchanger liquid 2 3 WAY VRF SYSTEM 4 3 WAY V
95. ir 3 Charging compressor oil into outdoor unit Connect the lower valve to the low pressure sensor outlet with Schrader type push to release valve in the outdoor unit to be oil charged and then connect the high pressure sensor outlet with push to release valve to the upper valve via the manifold gauge valves at Hi pressure gauge side In addition connect the suction line service port with push to release valve to the DPR Discharge Pressure Regulator Carry out the connection work quickly to avoid letting air enter e The hoses may be subject to internal pressure from the refrigerant inside the Nezey outdoor unit A Schrader type push to release valve is provided at each connection port e Since the DPR valve opens at pressures of 362 6 psi and above be sure to connect the DPR to the suction line service port low pressure side e gt p Ta ZH Eeer High pressure outlet port For 5 16 7 94mm dia connector 4 SS AE sage ge LA D T en Doc m Ze ch ta lard i Teas A Het vir 8 S LR en Ki AA al E JE D fi Art Li c ANE PS HAA TA LIE E Jk Ve og A _ Kn DI 7 UTE CU G Ld E p er o Kom eh d gt CH E Siam Suction tube service port For 5 16 7 94mm dia connector Fig 2 17 Low pressure outlet port For 5 16 7 94mm dia connector Manifold gauge PR Bai ta A
96. is 22 Hz If Quiet mode is selected the inverter may stabilize at a frequency lower than those stated above For information about Quiet mode refer to the field application functions 3 5 Forced Compressor Stop After a compressor stops it will not start for a period of 3 minutes 3 minutes forced OFF However this does not apply when the compressor was forced to stop as the result of a control operation during the special controls start control defrost control refrigerant oil recovery control etc which are described later 3 6 Roadmap Control 1 The below controls are performed according to the pressure sensor on the outdoor unit and the 2 temperature sensors attached to the indoor unit heat exchanger With roadmap control the pressure detected by the pressure sensor is converted to saturation temperature A temperature that has been converted to saturation temperature is called the pressure sensor temperature 2 These controls are performed every 30 seconds 3 The temperatures used to determine the area A AB B C for the evaporation temperature control shown in the figure on the next page and for condensation temperature control may vary depending on the relationships among factors including the difference between the room temperature setting and the indoor unit air intake temperature air intake temperature difference and the difference between the air discharge temperature setting and the air discharge te
97. is reached If it is apparent that the nitrogen gas is not entering the repaired section interrupt the feeding Short circuit the AP pins CN102 on the outdoor unit control PCB turn on power to run the outdoor unit then resume feeding nitrogen 4 Apply soapy water to the repaired part Such as a newly welded part and briefly inspect for any leakage If there are any leaks bubbles will show on the tubing surface To continue the air tight check after the brief leak inspection turn on power while short circuiting the AP pins Again feed nitrogen gas to obtain a system pressure of 522 1 psi Then measure both the outdoor ambient temperature and the pressure in the system Leave the system in this state for 1 full day and night and again measure the outdoor ambient temperature and pressure to determine any reduced values During the inspection it is recommended that an awning or cover be used to shield the unit in case of rain If no problem is found purge all nitrogen from the system wl as ab Sa OMI ee bech br R Manifold gauge Hi High pressure outlet port Ii APAE ed For 5 16 7 94mm 10 S ei v i PER dia connector d dE i ee e E ee ae EST a sell 5 HARA ALL Nitrogen gas Low pressure outlet port i For 5 16 7 94mm dia connector Fig 2 12 6 2 Checking for Leakage in Refriger
98. ised platform that is higher than drifting snow Provide snow vents When Connecting Refrigerant Tubing eoeecerer eee eee eee eee eee eee eee eee eee eee see eee sees eee eee e eee ee eee eee e eee ee eee eeeeeee eee e Ventilate the room well in the event that is refrigerant gas leaks during the installation Be careful not to allow contact of the refrigerant gas with a flame as this will cause the generation of poisonous gas e Keep all tubing runs as short as possible e Use the flare method for connecting tubing e Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them then tighten the nut with a torque wrench for a leak free connection e Check carefully for leaks before starting the test run e When performing piping work do not mix air except for specified refrigerant R410A in refrigeration cycle It causes capacity down and risk of explosion and injury due to high tension inside the A N refrigerant cycle Refrigerant gas leakage may cause fire Do not add or replace refrigerant other than specified type It may cause product damage burst and injury etc e Do not leak refrigerant while piping work for an installation or re installation and while repairing refrigeration parts Handle liquid refrigerant carefully as it may cause frostbite When Servicing e Turn the power OFF at the main power box mains before opening the unit to check or repair electrical
99. isplays gt COPY ES di TIMER OFF SET 01 lt No of connected indoor units gt 02 lt Unit Nos 1 2 3 and 4 are 4 units connected connected gt Fig 3 4 Fig 3 5 3 WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3 Ordinary Display Controls and Functions E Concerning the 7 segment 4 digit display remote controller timer display ee H 4 HH display and The connected unit Nos are displayed as shown below using the 7 segment 4 digit 57 the colon wa e Display for unit Nos 1 20 OFF OFF OFF 1 6 11 16 gt a pa gt aED 740 D g D O 6 D 4 O nav av 1 av dav 1441 20 21 40 41 60 61 80 ON ON ON ON a Meaning of display colon O O is not displayed Display for unit Nos 21 40 21 26 ca 31 GE 36 Ore Meaning of display colon D DA pf KU KU O DE DE LE LR m amv av av AV o 7 ON ON ON ON The meaning of the colon display changes in the same way allowing unit Nos up to 80 to be displayed Sample displays of the unit Nos of connected indoor units Display of unit No 1 Display of unit Nos 1 and 2 Me re gt
100. it e Install a normal CT in place of this CT and check If current is detected then the PCB can be judged OK CT circuit failure e Check that current is flowing in the phase where the CT circuit is connected Check voltage and current 2 Crossed wiring or installation error Trouble When the compressor is stopped the current value at the other compressor is high yw When this type of condition occurs seizing detection control takes priority 3 If the cause is still unknown after checking the above then it is possible that noise is the cause of the trouble It is necessary to connect a PC or other instrument Correction 1 Replace the CT circuit 2 Replace the outdoor unit PCB 3 Correct the problem 1 The connector was not inserted after the PCB was replaced Use a normal CT as a tool to determine whether the trouble is a PCB failure or CT failure H15 Alarm Alarm meaning H15 Compressor 2 discharge temperature sensor DISCH2 disconnected Alarm conditions e This alarm occurs when the discharge sensor temperature detector is not inserted into the tube s sensor holder or when the sensor itself has suffered some kind of malfunction other than a cut wire e When outdoor air temperature is 39 F or higher Alarm occurs if the temperature detected by the discharge sensor has changed by less than 4 F when the compressor has operated for 10 minutes immediately after start e When outdoor air temperature is below 39 F Alarm
101. it is operating amp During mixed heating cooling operation the number of heat exchangers used varies according the conditions of the indoor units However heat exchanger 1 at the outdoor unit which contains the inverter compressor with the lowest amount of operating time is always used amp SH control controls the difference between the liquid temperature and gas temperature to 2 10 F amp During heating mode SH operation refrigerant may not flow to the heat exchanger 1 19 3 WAY VRF SYSTEM 7 Outdoor Unit Electronic Control Valves MOV1 MOV2 MOV4 lt 0ntrol Functions 7 4 SC Circuit Electronic Control Valve MOV4 1 Operation to increase SC During cooling operation or mixed heating cooling operation when the outdoor unit heat exchanger is functioning as a condenser the liquid refrigerant which condenses at the outdoor unit heat exchanger flows into the receiver tank and SC sub cool supercooling approaches 0 F When SC is small and the length of the tubing connecting the indoor and outdoor units is long the pressure loss increases possibly resulting in lower capacities Therefore MOV4 operates at the double tube near the discharge port of the outdoor unit in order to increase SC MOV4 uses the receiver tank detection sensor and low pressure sensor located near the accumulator to perform control in order to prevent liquid back up lt Liquid refrigerant SC 0 F Gas refrigerant returns to th
102. its start stop Fig 3 1 lt Operation gt The _ J ON OFF operation button can be used to start and stop all the indoor units e The LED turns ON when 1 or more indoor units is operating e The LED blinks when an alarm has occurred at 1 or more indoor units during operation LED Switching between cooling heating Fig 3 1 lt Operation gt The _8_ MODE button switches between heating and cooling modes e The specifications are equivalent to the heating cooling inputs on the previous outdoor unit PCBs e The display shows the operating mode of the indoor unit with the lowest unit No All units test run Fig 3 2 lt Operation gt The CHECK button switches test run ON OFF for all indoor units e Press and hold for 4 seconds to turn ON TEST is displayed while the test run is in progress e The status of test runs that are started from the indoor unit remote controller are not displayed on the outdoor unit maintenance remote controller SG Double speed e Do not use for actual operation Doing so may damage the devices lt Operation gt The timer button is used to switch between double speed and normal operation e During double speed operation the SLEEPING MODE FC mark is displayed DES 3 WAY VRF SYSTEM 3 Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller M Display functions e Use the temperature setting and gi Noo
103. l level for that compressor reaches 2 or else alarm output occurs tii 3 WAY VRF SYSTEM 4 Special Controls Control Functions 4 2 3 Flow of system refrigerant oil recovery control 1 Simplified flow of system refrigerant oil recovery control System refrigerant oil recovery control follows this flow Normal operation gt 3 minute stop May stop for 6 minutes gt System refrigerant oil recovery control Max 3 minutes gt 3 minute stop gt Normal operation 2 Cooling cycle Control time Maximum 3 minutes Stops once before and once after control Outdoor units All outdoor units operate at maximum horsepower Electronic control valve Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity Indoor RAPvalve kit RAPvalve kit kit Valve kits at all indoor units operate in Cooling mode OFF status units Fan operates at the set fan speed stops or operates at L speed E on the indoor unit operation mode 3 Heating cycle Control time Maximum 3 minutes Stops once before and once after control Outdoor units All outdoor units operate at maximum horsepower Electronic control valve Valves at all indoor units operate at 480 pulses Indoor RAPvalve kit RAPvalve kit kit Valve kits at all indoor units operate in Heating mode ON status units Fan operates at the set fan speed stops or operates at L speed depending on the indoor unit operation mode 4 3 Defrost
104. ments International Mechanical Code 2009 IMC 2009 or more recently revised ASHRAE 15 ASHRAE 34 Precautions for Installation Using New Refrigerant 1 Care regarding tubing 1 1 Process tubing Material Use C1220 phosphorous deoxidized copper specified in JIS H3300 Copper and Copper Alloy Seamless Pipes and Tubes For tubes of 7 8 22 22 mm or larger use C1220 T 1 2H material or H material and do not bend the tubes Tubing size Be sure to use the sizes indicated in the table below amp Use a tube cutter when cutting the tubing and be sure to remove any flash This also applies to distribution joints optional When bending tubing use a bending radius that is 4 times the outer diameter of the tubing or larger Use sufficient care in handling the tubing Seal the tubing ends with caps or tape to CAUTION prevent dirt moisture or other foreign substances from entering These substances can result in system malfunction Unit in mm Material O Outer diameter 1 4 6 35 3 8 9 52 1 2 12 7 5 8 15 88 3 4 19 05 Copper tube Wall thickness 1 32 0 8 1 32 0 8 1 32 0 8 5 128 1 0 over 5 128 1 0 Unit in mm Material 1 2 H H re Outer diameter 7 8 22 22 1 25 4 1 1 8 28 58 1 1 4 31 75 1 1 2 38 1 1 5 8 41 28 opper tube i Wall thickness 5 128 1 0 5 128 1 0 5 128 1 0 3 64 1 1 over 3 64 1 15 lover 3 64 1 20
105. mmunication from other outdoor unit constant speed Alarm conditions After initial communications were completed communications from an outdoor unit stopped Probable cause 1 After initial communications were completed the control wiring between main and sub outdoor units was cut 2 After initial communications were completed the outdoor unit power was turned OFF 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis E25 Alarm Alarm meaning Outdoor unit address setting failure duplication Alarm conditions Communication by outdoor unit main sub control wiring was received that contained the same address as that unit 5 times or more within 3 minutes Probable cause The unit number is set incorrectly Check Check the unit number again Correction Correct the incorrect unit number setting Example EE Notes Recovery from this alarm occurs automatically when communication that contains the same address is not received for 3 minutes E26 Alarm gemeng fem Alarm meaning Mismatch in outdoor unit quantity Alarm conditions After power initialization the set outdoor unit quantity did not match the number of outdoor units detected on the outdoor unit main sub control wiring for 3 minutes or longer Probable cause 1 The outdoor unit quantity is set incorrectly Check 1 Check the outdoor unit quantity setting again Correction 1 Correct the incorrect outdoor unit quantity setting Example EN Notes Re
106. mory IC EEPROM on indoor unit control PCB Operating and timer lamp blinking F29 simultaneously GE Failure of nonvolatile memory IC EEPROM on outdoor unit control PCB Operating and timer lamp blinking F31 simultaneously O Protective ve No current detected when GE Timer lamp blinking HE i xti e HIC trouble alarm H31 Low oil alarm Connection failure of oil detection sensor Compressor 1 INV H08 Compressor 2 constant speed H27 Fusing of electromagnetic contact Current detected when compressor was OFF CHECK Automatic backup operation only blinking Les Las Ca No display changes lt lt gt gt alarm indication Does not affect the operation of other indoor units lt gt alarm indication In some cases may affect the operation of other indoor units 3 WAY VRF SYSTEM 2 Outdoor Unit Control Panel LED Display Trouble Diagnosis O ON x Blinking OFF LED RED Display meaning After the power is turned ON and automatic address setting is not in progress no communication with the indoor units in that system is possible After power is turned ON and automatic address setting is not in progress 1 or more indoor units are confirmed in that system however the number of indoor units does not match the number that was set Automatic address setting was completed successfully After the power is turned ON and automatic address setting is not in progress the number of detected ind
107. mperature air discharge temperature difference 4 Definitions of evaporation temperature and condensation temperature Evaporation temperature Te Lowest heat exchanger temperature E1 E3 at any indoor unit Condensation temperature Tc Highest temperature among the outdoor unit pressure sensor temperature and the heat exchanger temperatures E1 at all indoor units where the heating thermostat is ON Ordinarily this is the outdoor unit pressure sensor temperature If multiple outdoor units are connected this is the highest outdoor unit pressure sensor temperature E3 temperature is not used for condensation temperature detection because it may indicate the temperature of superheated gas 3 WAY VRF SYSTEM 3 Compressor Control Control Functions 3 6 1 Evaporation Temperature Te Control Control of Indoor Units Operating in Cooling Mode 60 8 Horsepower increase 53 6 51 9 permitted Area A 51 8 Horsepower increase permitted Area AB gt Horsepower increase prohibited Area B 41 1 41 0 35 6 35 4 Horsepower decrease ES 0 15 30 Maximum requirement level L Depending on the maximum requirement level of the indoor unit the judgment temperatures for each area may vary as shown in the figure example 1 For indoor units that are operating in Cooling mode if one unit is selected for a test run then the air intake temperature difference difference between the room temperature setting an
108. mple Settings Function Remote Controller Functions List of Simple DE Items Setting data Description 0000 Not displayed 0001 150 hours 0002 1 2 500 hours 0003 15 000 hours 0004 10 000 hours Use the filter clogging sensor 0000 Standard setting at time of shipping Degree of filter fouling 0001 Highly fouled Filter sign ON time is reduced to one half the set time 0001 Central control address 1 0002 Central control address 2 0003 Central control address 3 Central control address 0064 0064 Central control address 64 0099 No central control address set setting at time of shipping Operating mode 0000 Normal setting at time of shipping priority change 0001 Priority a Compressor ON Compressor OFF 0000 MED 1 min LO 3 min Fanspeedwhen 0001 MED 1 LD Filter sign ON time fitlter life time LO heating thermostat is OFF 0006 LO MED 0000 0001 0002 Ge lat Reeg 0006 ex intake temperature 12 F down Electric heater 0000 _ No heater installation 0001 Heater installed Humidifying when 0000 No setting at time of shipping heater thermostat is Permit prohibit 0000 Permit automatic heating cooling 0001 Prohibit Codan 0000 Normal y 0001 Cool only Set 1 for item code OD e In order to avoid water leakage and damage to the fan do not set for humidifying when the thermostat is OFF unless a vaporizing humidifier is used e Consider the devi
109. n as a result of a low oil level this alarm occurs This alarm will not occur if system oil recovery control has not already been performed However the alarm may not occur if the outdoor unit where the system oil recovery conditions were met is not the same as the outdoor unit which stopped due to low oil level In this case system oil recovery control may be performed again Alarm display HO7 3 WAY VRF SYSTEM Control Functions 16 Pressure Sensor Failure This system contains 2 types of pressure sensors a high pressure sensor and a low pressure sensor 1 High pressure sensor failure Identification of a failure caused by a loose or displaced connector is based on the relationship between the pres sure detected by the high pressure sensor and the operation of the high pressure switch and on the relationship between the temperature detected by the high pressure sensor and the various temperature thermistors However when the pressure increases suddenly the judgment for the high pressure sensor failure alarm may occur before operation of the high pressure switch Therefore before concluding that there is a failure in the pressure sensor first verify that the service valve was not accidentally left closed that there are no blocked cir cuits and that there is no leakage of refrigerant into stopped outdoor units Also check for a difference between the high pressure measured by the manifold gauge and the pressure detected by the
110. nce between sensor No 1 and No 3 Resistance of less than 10kQ indicates a short circuit or other trouble Resistance of 10kQ 200kQ is normal Resistance of more than 200kQ indicates an open circuit or other trouble e Connect a gauge to the high pressure outlet and check for changes in the value dispalyed by the monitoring software and for large deviation of the gauge pressure e During heating check whether the temperature is lower than the highest indoor unit E1 temperature The pressure detected by the high pressure sensor is the highest pressure in the system Therefore during heating the converted saturation temperature will never be lower than any indoor unit E1 temperature During cooling this temperature will never be lower than the outdoor unit liquid temperature 2 Failure to open the service valve clogged tubing valve leakage over charging In all of these cases an alarm occurs when there are rapid pressure fluctuations and tracking of the detected pressure is poor e Check the open closed status of the valve e Check for clogging of the tubing To check for clogging disconnect the high pressure sensor from the PCB and check whether the high pressure SW activates e Check for valve leakage and over charging When valve leakage or over charging occurs refrigerant is likely to accumulate in the outdoor units or indoor units resulting in a sudden rise in pressure at start that occurs before the refrigerant in the heat exc
111. nce of the outdoor unit Connect the outdoor unit maintenance remote controller to the RC connector CN006 3P BLU on any one of the outdoor unit control PCBs Then start a test run of all units Press and hold the 4 CHECK button for 4 seconds Press the MODE button and change to cooling operation Even if the mode that is originally displayed is Cool be sure to press the Nezen MODE button once or more to change to cooling operation Pressing the TI MODE button ensures that heating cooling operation is not mixed and that all units are operating in either Heating or Cooling mode Use the remote controller CZ RTC2 to check the operating status of the indoor units Check that all units are operating in Cooling mode CAUTION With the 3 way valve it is difficult to determine whether operation is heating or Aere cooling by touching the tubing If the remote controller CZ RTC2 is not available for maintenance of the outdoor unit Determine the outdoor unit where the unit No setting S007 3P DIP switch BLU on the outdoor unit control PCB is set to No 1 Q Short circuit the mode change pin CN101 on the outdoor unit control PCB of the No 1 unit Then short circuit the test run pin CN023 to start operation Short circuiting the mode change pin ensures that heating cooling operation is not mixed and that all units are operating in either Heating or Cooling mode 3 Check the displays of the ind
112. ndoor unit ball valve Run the unit in Cooling mode for 10 to 20 minutes more Fully close the suction line ball valve and stop the operation of all units Use hoses to connect the manifold gauge valves refrigerant recovery unit and refrigerant recovery cylinder with each other Fig 2 10 Do each connection quickly to prevent air from entering the tubing Remaining refrigerant may create internal pressure therefore care should be taken when connecting the hoses exon 3 WAY VRF SYSTEM 5 Recovering Refrigerant Outdoor Unit Repair Procedures 6 Recover the remaining refrigerant from the indoor unit using the refrigerant recovery unit Ball valve separately purchased Service port NOTE sep yp Suction tube S Ti rmin mpletion of refrigeran Outdoor o dete e completion of refrigerant a EE E recovery follow the instructions that ade i came with the refrigerant recovery unit Liquid tube amp Solenoid Solenoid mene valve kit valve kit gauge w e Refrigerant f recovery unit Refrigerant recovery cylinder Fig 2 10 Indoor unt 5 2 3 Refrigerant recovery procedures 2 for indoor unit with no ball valve Refrigerant in all indoor units and the refrigerant tubing circuit must be pumped into the outdoor unit The maximum refrigerant storage capacity per a single outdoor unit is approx 529 oz Thus in order to collect all refrigerant from the system a separate r
113. ne Leak detector Outlet for HFC134a can be used for R410A Flaring oil Yes No For systems that use R22 apply mineral oil Suniso oil to the flare nuts on the tubing to prevent refrigerant leakage For machines that use R407C or R410A apply synthetic oil ether oil to the flare nuts Using tools for R22 and R407C and new tools for R410A together can cause defects 3 2 Use R410A exclusive cylinder only Single outlet valve with siphon tube Liquid refrigerant should be recharged with the cylinder standing on end as shown Nae New refrigerant R410A cannot be used for earlier models 1 Compressor specifications are different lf recharging a R22 or R407C compressor with R410A durability will significantly decrease since some of the materials used for compressor parts are different 2 Existing tubing cannot be used especially R22 Completely cleaning out residual refrigerating machine oil is impossible even by flushing 3 Refrigerating machine oil differs R22 Since R22 refrigerating machine oil is mineral oil it does not dissolve in R410A Therefore refrigerating machine oil discharged from the compressor can cause compressor damage pt R22 refrigerating machine oil Mineral oil Suniso oil R407C refrigerating machine oil Synthetic fluid ether oil R410A refrigerating machine oil Synthetic fluid ether oil Valve
114. nit maintenance remote controller is not available use the following method to stop the operation of all units Pull out the SCT connector 2P YEL CN231 from the outdoor unit control PCB of the unit where pump down is being performed When the SCT connector is pulled out alarm F12 sensor trouble immediately occurs and all outdoor units stop operating Be sure that you do NOT grasp the lead wire when pulling out the connector Removing any other connector may not cause the units to stop Therefore be sure to pull out only the SCT connector 4 Connect a refrigerant recovery device to the liquid tube service port Schrader type valve of all outdoor units where dry cores will be attached then recover the refrigerant from the tubing Be sure that no air enters the tubing at this time When the hose is connected internal pressure is applied by the remaining Nezen refrigerant in the inter unit tubing The connection port employs a Schrader type valve To determine when refrigerant recovery is compete follow the instructions in the instruction manual of the refrigerant recovery device 5 As shown in Fig 2 21 disconnect the tube that runs from the liquid tube valve to the ball valve on all outdoor units where dry cores will be attached Then attach the dry cores 6 At all outdoor units where dry cores are attached pressurize with 522 1 psi of nitrogen from the liquid tube service port and check for leaks 7 After evacuating all
115. nly the compressors in a system compressors in a failed unit failed compressor Follow the instructions in 10 2 4 Dry core cleaning and Follow the instructions in 10 2 4 Dry core cleaning and perform dry core cleaning of all outdoor units perform dry core cleaning of the failed outdoor unit Reference Symptoms of motor burning 1 Ground fault results in breaker operation 2 Short circuit results in different coil resistance at different phases 3 Open circuit 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures 10 2 Replacing the Compressor s 10 2 1 Replacing only the failed compressor 1 2 3 4 E 9 If backup operation is required follow the instructions in 4 Backup Operation and engage backup operation Follow the instructions in 10 3 Removing and Installing Compressors and replace the failed compressor Fully close the high and low pressure gauge valves on the manifold gauge then stop the vacuum pump Disconnect the manifold gauge from vacuum pump Connect the manifold gauge to the cylinder where the refrigerant was recovered At this time be careful that air does not enter the tubing Open the valve on the refrigerant recovery cylinder and the high pressure gauge valve on the manifold gauge to charge with refrigerant At this time the low pressure gauge valve on the manifold gauge remains fully closed If the recovered refrigera
116. nosis E16 Alarm Alarm conditions e The number of indoor units was too many when automatic address setting was performed a e After initial communications were completed an unrecognized unit was detected Probable cause 1 The number of indoor units set at the indoor unit quantity setting SW 5004 5005 on the outdoor unit PCB is less than the number set 2 The inter unit control wiring is wired incorrectly Check 1 Refer to the test run servicing materials and check the number of indoor units that is set 2 Check the inter unit control wiring at the indoor and outdoor units Correction After correcting the indoor unit quantity setting or the inter unit control wiring perform automatic am address setting again Exampe gt S Notes 9 S O E20 Alarm gemeng fem No indoor units at automatic address setting Alarm conditions When automatic address setting was performed no indoor units were recognized Probable cause The inter unit control wiring from the outdoor unit to the indoor units has been cut Serial connector 1 CN001 is disconnected at the outdoor unit The power is OFF at all indoor units in the system Check Check whether the inter unit control wiring from the outdoor unit to the indoor units is cut Check whether serial connector 1 CN001 is disconnected at the outdoor unit d Ge a Ab wa ver NM ge t piita i SCH V E24 Alarm Outdoor unit INV failed to receive co
117. nsor input not present Control is performed 1 Sensor input present Control is performed 2 Sensor input not present Control is not performed 3 Sensor input present Control is not performed Outdoor unit fan Quiet 0 Disabled 1 Quiet mode 1 2 Quiet mode 2 3 Quiet mode 3 mode 4 Quiet mode 4 0 None 1 Discharge temp control only Mode 3 2 Demand only Mode 2 3 Discharge temp control Demand Mode 1 Energy saving operation 0 Independent plug 1 All indoor units linked Snowfall sensor usage Energy saving mode Demand 1 current 0 0 1 40 4 70 7 100 8 120 9 140 10 160 11 200 12 1 no limit Demand 2 current 0 0 1 40 4 70 7 100 8 120 9 140 10 160 11 200 12 1 no limit 3 12 3 WAY VRF SYSTEM 6 Mode Settings Outdoor Unit Maintenance Remote Controller E Setting mode 2 lt Operating procedure gt Press and hold the CHECK button button and button simultaneously for 4 seconds or longer Use the temperature setting Ca and buttons to change the item code The item codes and setting data are shown in the table below Q Use the timer time 4 and Ce buttons to change the setting data To confirm the changed setting data press the button At this time Gai stops blinking and remains lit During this mode is displayed blinking The display shows the set outdoor unit address System XX YY System XX System addres
118. nt becomes mixed with another refrigerant or another gas een such as nitrogen or air do not use the recovered refrigerant for charging Charge with the designated amount of new refrigerant When charging has been completed with an amount of new refrigerant equal to the amount of recovered refrigerant or when charging with the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit fully close the high pressure gauge valve on the manifold gauge Next turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Finally fully open all valves on the suction tube discharge tube liquid tube and balance tube If backup operation was engaged follow the instructions in 4 Backup Operation and perform backup Operation recovery If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible fully close the high pressure gauge valve on the manifold gauge Then while the unit is operating in 5 2 1 Cooling operation for all units open the low pressure gauge valve on the manifold gauge and charge with the designated amount of refrigerant When charging with liquid refrigerant add refrigerant a little at a time in order to exon prevent liquid back flow Fully close the low pressure gauge valves on the manifold gauge follow the instructions in 8 Charging Compressor Oil and charge with oil if ne
119. o 1 unit e Settings at other outdoor units No particular changes 2 Adjusting the refrigerant for backup operation During backup operation all of the service valves on the failed unit are closed However if a check of the backup operating conditions shows that the level of gas is low recover the refrigerant from the failed outdoor unit If the level of gas is too high collect refrigerant at the failed outdoor unit amp Recovering refrigerant With the normal outdoor units operating monitor the operating condition and open close the suction tube service valve on the failed outdoor unit where all the service valves were closed In this way recover refrigerant from the failed outdoor unit in order to adjust the amount of refrigerant in the system After adjusting the amount of refrigerant close the suction tube valve at the failed outdoor unit Collecting refrigerant in the failed outdoor unit e Short circuit the vacuum application pin CN102 on the control PCB of the failed outdoor unit where the service valves are closed then turn the power ON Also disconnect the wiring between the outdoor units e With the normal outdoor units operating monitor the operating condition and open close the liquid tube service valve on the failed outdoor unit where all the service valves were closed In this way collect refrigerant in the failed outdoor unit in order to adjust the amount of refrigerant in the system 3 WAY VRF SYSTEM 4 Backup
120. occurs if the temperature detected by the discharge sensor has changed by less than 4 F when the compressor has operated for 30 minutes immediately after start Probable cause 1 Discharge sensor temperature detector is not inserted into the tube s sensor holder 2 Discharge sensor itself has suffered some kind of malfunction other than a cut wire 1 2 Check 1 Check that the discharge temperature sensor is inserted into the sensor holder 2 Check that sufficient heat conducting putty is applied 3 Remove the discharge sensor from the sensor holder and expose the sensor to the outside air for approximately 5 minutes Check that the temperature detected by the sensor changes to match the outside air temperature However the sensor cannot detect temperatures at or below 32 F 1 Install the sensor into the holder and apply sufficient heat conducting putty 2 If the sensor is malfunctioning replace it Example O Notes The discharge temperature sensor is generally a sensor intended for accurate detection of high temperatures Therefore it will not accurately detect the temperature if the temperature at the measurement point is 68 F or below 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis HO6 Alarm Alarm meaning Abnormal low pressure drop Alarm conditions A pre trip occurs during the unit s operation when the low pressure sensor installed at constant low pressure parts detects a pressure of 7 25 psi o
121. ode 3 Operation 1 When 1 outdoor unit is installed When 1 compressor has failed backup operation is possible using the other compressors However operation does not occur when the outdoor fan is unable to operate as a result of alarm P22 2 When multiple outdoor units are installed When automatic backup mode is engaged the outdoor unit where the above alarm occurred stops operating However if one or more of the compressors is able to operate then this outdoor unit operates only when the operation of all outdoor units is required for special control or other system purposes 4 Alarm display If a wired remote controller is present the AN display blinks during operation 5 Canceling automatic backup operation Repair the outdoor unit where the failure occurred When repairs are completed reset the power on outdoor unit No 1 lt Caution gt After automatic backup mode has been engaged it will not be canceled automatically when the repair of the failed outdoor unit is completed Automatic backup mode will be canceled only when the power on outdoor unit No 1 is reset Therefore after repair work is completed be sure to check whether or not automatic backup mode has been canceled How to check 1 Use test run or other means to verify that all outdoor units operate continuously 2 If a wired remote controller is present check that the AN display has disappeared 3 WAY VRF SYSTEM 17 Backup Operation Control Func
122. ogen from the liquid tube service port and check for leaks 16 After evacuating all nitrogen gas from the tubing apply vacuum to all outdoor units where dry cores were removed until the pressure is 14 7 psig 5 Torr or less 17 INSTALLATION Refer to the Information for the Person in Charge of Installation items Charge with an amount of refrigerant equal to the amount that was recovered B If a ball valve is not installed on the outdoor unit 1 Refer to Refrigerant recovery procedures 2 for indoor unit with no ball valve under 5 2 Refrigerant Recovery Procedures Indoor Unit Perform pump down of the refrigerant from all indoor units and inter unit tubing to the outdoor unit side 2 Cut the liquid narrow tube at all outdoor units where dry cores will be attached then attach the dry cores and ball valves as shown in Fig 2 21 3 For the next steps refer to 6 17 in A on the previous page Cleaning dry core Liquid tube service valve Outdoor unit Normal unit Se Hl Fa Hm met gm Va WC ae q ei ee L Fer LL ed Sg SER FP FR EPO 4 H HL 2 ride Dat FE Log dei H RT N EE Si REA U IEUS leses G ER Ja DER d IRSCH H Kim i Gear le KE KIRSTI LE FS ere Re Ero Es PA LES GI cas s EIT LI kV E I LT Jr LE R O E
123. ollow the instructions in A Replacing the inverter compressor B Replacing the constant speed compressor and remove the compressors There is no predetermined sequence for removal any compressor may be removed first E Installation 1 Follow the instructions in A Replacing the inverter compressor B Replacing the constant speed compressor and remove the compressors There is no predetermined sequence for installation any compressor may be installed first 3 WAY VRF SYSTEM 11 High and Low Pressure Sensors Kor Vei Npa veer The outdoor unit connection ports for the high and low pressure sensors employ Schrader type push to release valves Therefore it is not necessary to recover refrigerant when removing and installing them 11 1 Removing the High Pressure Sensor 1 Follow the instructions in 1 Removing Panels and 2 Removing Electrical Component Box and Duct and remove the corresponding components from the outdoor unit where the high pressure sensor will be removed 2 Disconnect the high pressure sensor connector 3P BLK from terminal CNOO9 on the outdoor unit control PCB of the outdoor unit where the high pressure sensor will be removed 3 Use 2 adjustable wrenches in combination to remove the high pressure sensor When removing the high pressure sensor internal pressure will be applied by the exon refrigerant in the outdoor unit The high pressure sensor connection por
124. on tube discharge tube liquid tube balance tube at the failed outdoor unit and disconnect the wiring between the outdoor units 3 WAY VRF SYSTEM 4 Backup Operation Outdoor Unit Repair Procedures lt lf the failed unit is the No 1 outdoor unit main unit gt If the No 1 unit main unit has failed a different outdoor unit must be set as the No 1 unit main unit e Settings at the failed No 1 outdoor unit No particular changes However close all service valves suction tube discharge tube liquid tube balance tube at the failed outdoor unit and disconnect the wiring between the outdoor units main sub unit wiring e Settings at No 1 unit main unit System address S003 5002 Make the same settings as on the failed No 1 unit No of indoor units 5005 5004 Make the same settings as on the failed No 1 unit No of outdoor units 5006 Subtract the number of failed units from the current setting Outdoor unit No S007 Change to 1 To this outdoor unit connect the inter unit communication line which was previously connected to the No 1 unit main unit After recovery work is completed return the outdoor unit No setting now 1 to the value it was before the failure and repair If this is not done there will Jam be duplicated outdoor unit No settings In this case an alarm does not occur immediately however operation may be unstable Reconnect the inter unit communications line to the N
125. ontrol It is not constantly ON 1 18 3 WAY VRF SYSTEM 7 Outdoor Unit Electronic Control Valves MOV1 MOV2 MOV4 2770 Functions 7 1 Types of Electronic Control Valves U 72MF1U9 U 72MF1U9E U 96MF1U9 U 96MF1U9E Capacity 72 16 Electronic control valve 1 Heat exchanger 1 valve Heat exchanger 1 valve Fen Electronic control valve 2 Heat exchanger 2 valve Heat exchanger 2 valve control valve Electronic control valve 4 For SC circuit For SC circuit 7 2 Power Initialization If no indoor units have started even once after the power was turned ON the outdoor unit electronic control valve operates at 480 pulses 7 3 Heat Exchanger Controlled by Each Electronic Control Valve The configuration of the heat exchangers is different depending on the capacity of the outdoor unit Heat exchanger 1 BB za Type 72 96 Operation of electronic control valves during normal unit operation Heat exchanger mov MOV2 Remarks status All indoor units in Cooling mode em 9 Stopped O O Refrigerant shut off Al indoor units in Heating mode Stopped o o _ Refrigerantshutoff Mixed heating exchanger condenser Stopped o o Refrigerantshutof cooling operation exchanger evaporator Stopped o o Refrigerantshutoff When all indoor units are operating in Cooling mode or Heating mode all outdoor unit heat exchangers are used if even one of the compressors in that outdoor un
126. ontrol wiring is connected to individual control indoor unit de ic Indoor unit address is not set yet ix Capacity code of indoor unit is not set Mismatch of outdoor unit type ee Duplication of outdoor R C address setting EA ready lamps blinking L04 simultaneously Capacity code of outdoor unit is not set xt O xt Thermistor Indoor unit Operating and SI ER SS GK Continued Operating lamp blinking Xi E 5 2 3 WAY VRF SYSTEM 1 Contents of Remote Controller Switch Alarm Display Trouble Diagnosis ON Blinking 3X OFF Wireless remote controller receiver display Possible cause of malfunction for heating Compressor 1 INV discharge temp sensor Thermistor fault Outdoor unit Compressor 2 constant speed discharge temp sensor Outdoor air temp sensor F08 Heat exchanger 1 liquid temp sensor SECH timer amps blinking Heat exchanger 1 gas temp sensor altemately High pressure sensor 1 me JG F17 F24 L Heat exchanger 2 gas temp sensor F23 Ceiling panel connection failure CY KP 09 gt rimer and heg Protective E protector in indoor unit fan motor is activated lt lt P01 gt gt ready lamp blinking device lt lt P10 gt gt Jatematep lt lt Pi2s gt I xx xy Outdoor unit ready lamp blinking mie lx Start failure caused by compressor wire missing phase DCCT l Se P29 failure or similar problem INV compressor start failure Failure of nonvolatile me
127. ooling operation this system also includes the following 3 types of special controls for control of the system as a whole 1 Tube refrigerant recovery control 2 System refrigerant oil recovery control 3 Defrost control 4 1 Tube Refrigerant Recovery Control This control recovers refrigerant from the tubing when the microcomputer is initialized immediately after power ON after warning output occurs and after a set amount of time has elapsed standard 60 minutes when all outdoor units are stopped This control is intended to recover refrigerant if refrigerant has accumulated somewhere in the tubing when the units have been stopped for long periods as well as to compensate for tubing thermal loss during heating start and is also used for oil recovery 1 Control when the outdoor unit heat exchanger is acting as a condenser when all units are in Cooling mode or at start of mixed operation when the cooling load is high Control time Outdoor units All outdoor units operate at maximum horsepower Electronic control valve Valves at all indoor units operate at a fixed pulse according to the indoor unit capacity Indoor RAP valve kit Valve kits at all indoor units operate in Cooling mode ON status units Fan Fan operates at the set fan speed stops or operates at L speed depending on the indoor unit operation mode When the above operation is finished normal operation starts at the horsepower determined by the indoor units
128. oor unit remote controllers Check that all units are operating in Cooling mode If all units are operating in Heating mode perform the steps listed below With the 3 way valve it is difficult to determine whether operation is heating or AN cooling by touching the tubing 4 Release the short circuit at the test run pin CNO23 on the outdoor unit control PCB of the No 1 unit Then short circuit the stop pin CN104 to stop operation Short circuit the mode change pin CN101 on the outdoor unit control PCB of the No 1 unit Switching of the 4 way valve occurs immediately before operation starts Therefore it does not change at this time Mode change cannot be judged from the sound Short circuit the test run pin CN023 on the outdoor unit control PCB of the No 1 unit Then check the displays of the indoor unit remote controllers Check that all units are operating in Cooling mode 5 2 2 Refrigerant recovery procedures 1 using indoor unit ball valve 1 If a ball valve with a service port has been provided in the indoor unit as shown in Fig 2 10 follow the instructions given in 2 through 6 below If the service port is instead located in the outdoor side follow the instructions in 5 2 3 Refrigerant recovery procedures 2 After running the unit in Cooling mode for about 5 minutes as described in 5 2 1 Cooling operation for all units fully close the discharge line the liquid line ball valve and i
129. oor units connected to that system matches the number that was set and regular communications are occurring Automatic address setting is in progress At time of automatic address setting the number of indoor units did not match the number that was set Alarm display eee LED 1 blinks M times then LED 2 blinks N times The cycle then repeats Blinking alternately M 2 Palarm 3 Halarm 4 Ealarm 5 F alarm 6 L alarm N Alarm No Example LED 1 blinks 2 times then LED 2 blinks 17 times The cycle then repeats Alarm is P17 3 Remote Controller Servicing Functions Sensor temperature display function displayed both when unit is running and stopped Use the following check procedure to display the sensor temperatures from the remote controller indoor unit and outdoor unit sensors on the remote controller display lt Check procedure gt OU Press and hold the CHECK button and button simultaneously for 4 seconds or longer Q The following appears on the remote controller LCD display unit No X X main unit No item code XX sensor address and service monitor 00XX sensor temperature See figure at right 3 Press the temperature setting 4a and Evy buttons to change the item code to the sensor address of the sensor you wish to monitor For the relationship between the sensor address and sensor type refer to the sensor temperature relationship table on next page If group control is
130. or longer for a constant speed compressor P04 Alarm Alarmcode PW High pressure switch activated Alarm conditions The operation of the electronic circuit in the high pressure switch may short circuit the terminal depending on the pressure pressure of 522 1 psi or above will short circuit the terminal Once the terminal is short circuited it will remain in that state until the pressure goes below 377 1 psi Failure of the check valve in the compressor discharge tube The service valve is closed Clogging of the outdoor heat exchanger during cooling An air short in the outdoor unit during cooling Failure of the outdoor fan during cooling Clogging of the air filter in the indoor unit during heating An air short in the indoor unit during heating Failure of the indoor fan during heating Clogging of the refrigerant circuit Failure of the mechanical valve Failure of the solenoid valve kit Too much refrigerant has been charged Failure of the high pressure switch Make sure that the high pressure switch connector has been properly connected If the high pressure switch is properly connected connect a high pressure gauge to the high pressure outlet port and monitor the pressure during operation to check the pressure when the high pressure switch is activated Check valve failure is likely if the pressure is less than 522 1 psi The following describes checks to be made when the pressure is high During cooling check whet
131. ort circuit the vacuum application pin on the outdoor unit control PCB of the unit to be repaired Then turn ON the outdoor unit power When the vacuum application pin is short circuited and the power is turned ON all Nezen solenoid valves in the outdoor unit are forced open allowing the refrigerant to be recovered from all tubes which are separated by solenoid valves If this work is not performed it will not be possible to recover all of the refrigerant at the refrigerant recovery device Be sure to perform this step 10 Open both Hi and Lo side valves on the manifold gauge valves and recover the refrigerant remaining in the outdoor unit After that measure the amount of recovered refrigerant NOTE To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 3 WAY VRF SYSTEM 9 Pumping Out Refrigerant from Outdoor Unit SOOO Ot DV geg 9 2 If Remote Controller CZ RTC2 is Not Available for Maintenance of the Outdoor Unit 1 Refer to 4 Backup Operation and perform backup operation 2 Connect the manifold gauge valves at the Lo side to the low pressure outlet port of the outdoor unit to be repaired Also connect the refrigerant recovery cylinder to any one of the normal outdoor units at the liquid line service port Schrader type push to release valve Perform the connection work quickly so that no air is allowed to enter Fig 2 20 Connecting the refrigerant
132. osed and refrigerant has not returned to the compressor In some cases when moisture enters the refrigerant circuit it can freeze at the low pressure locations and the resulting ice can block the circuit wy If the alarm occurs when there is sufficient refrigerant in the system 1 and 3 liquid refrigerant has definitely accumulated somewhere in the system Liquid refrigerant generally accumulates in high pressure locations In this case the high pressure gradually increases however it may not increase if the location where the liquid accumulates is sufficiently large Depending on the refrigerant saturation temperature it may also accumulate in low pressure locations In this case the high pressure is unlikely to increase 1 Check that the service valve is open 2 Check that none of the valves mechanical valves solenoid valves in the main refrigerant circuit is closed due to an operation failure 3 Check that there is no possibility of foreign objects or water having entered the refrigerant circuit 4 Check that valve leakage at a stopped sub unit has not resulted in accumulation of refrigerant at that sub unit 5 Check that no refrigerant leakage has occurred 1 If there was a valve operation failure in general it is necessary to replace the valve 2 If a foreign object or moisture has entered the circuit install a strainer or dry core depending on the degree of the problem Correction 3 If refrigerant has
133. ot changed Heating Cooling Heating Cooling Fan Fan not changed l Cooling Cooling not changed Cooling Dry Dry Dry not changed Heating Cooling Heating Dry Fan Fan not changed Cooling Cooling not changed Cooling or dry Fan Dry Dry not changed Fan Fan not changed Heating Heating not changed Fan Fan not changed Crem coas nem J Description O O Fan speed setting when l ew heating thermostat is OFF Changes the fan speed setting when the heating thermostat is OFF Heating intake temperature Shifts the intake temperature during heating shift Can be set when the body thermostat is used Set when cost distribution is performed using an AMY central control system Electric heater installation or similar system and when an optional electric heater is installed This is unrelated to control of the electric heater Normally humidifying does not occur when the thermostat is OFF during ate heating operation However this setting can be changed in order to increase Humidifying when heater Ce thermostat is OFF the amount of humidifying Caution In order to avoid water leakage and damage to the fan do not use this setting unless a vaporizing humidifier is used This setting can be used to prevent the automatic heating cooling display on the remote control if the unit configuration permits automatic heating cooling operation Cooling only V setting allows a heat pump indoor unit to be operated as a cooling onl
134. ot run with a groaning sound 2 CT circuit failure PCB failure Trouble Check Check for poor connector contact e Check the continuity of the CT circuit e Install a normal CT in place of this CT and check If current is detected then the PCB can be judged OK gt CT circuit failure e Check that current is flowing in the phase where the CT circuit is connected Check voltage and current 3 Missing power phase Trouble This alarm primarily occurs when the T phase is missing When the R phase or S phase is missing CT trouble or PCB continuity trouble occur However this may not be true in the case of a missing phase caused by magnet SW trouble Check There is the possiblility of a magnet SW failure Therefore check the phase voltage at a location that is as close to the compressor as possible 4 Low power voltage Trouble In most cases this occurs when another constant speed compressor including compressors in other units or other device starts It also occurs when the power wiring is extremely long Check Check the voltage between each of the phases However if this trouble occurs when other devices or compressors start then an oscilloscope is required 5 PCB failure Trouble Check Check that the current value measured with the clamp meter is not lower than the value measured with the PC or remote controller 6 If the cause is still unknown after checking the above then it is possible that noise is the cause of the trouble I
135. ote controller to change the outdoor unit EEPROM settings For information concerning EEPROM settings refer to the field application functions 2 2 Delayed Start of Outdoor Units 1 Delayed start of outdoor units in the same system If it is necessary to operate the compressors simultaneously at multiple outdoor units each outdoor unit will start beginning with unit No 1 after a delay of a number of seconds equivalent to the outdoor unit address The units do not start simultaneously This is in order to reduce the load on the power receiving equipment Outdoor unit gt Outdoor unit address 1 address 2 Starts after 1 second Starts after 2 seconds 2 Delayed start for each system At the time of factory shipment delayed start for each system is not set to occur Therefore when systems are linked and multiple systems are selected for start simultaneously by the central control device all systems will begin operating simultaneously For this reason a function is included to delay the start time for each system address when systems are linked and multiple systems are selected for start by the central control device In order to enable this delay time it must be set in the EEPROM for each system Those systems where this setting has been made will start after a delay according to their system addresses For information concerning EEPROM settings refer to the field application functions 2 3 Outdoor Uni
136. perature is 50 F or below the fan operates for 30 seconds every 2 hours in fan mode 8 even when the outdoor unit is stopped or the heat exchanger is not in use This control is intended to prevent snow from accumulating on stopped fans Because the outdoor air temperature cannot be accurately detected when the unit is stopped a higher outdoor air temperature is used for the control condition in order to ensure correct operation 2 If the fan mode becomes 0 during cooling operation the fan mode is changed to 1 This control is predictive control Use a snowfall sensor as necessary according to the installation conditions 8 6 When the Compressor Magnet Switch Seizing Alarm Occurs Because there is the possibility that the high pressure has increased the fan operates in Max fan mode 8 7 Other This unit includes settings for high static pressure and for Quiet mode For information about these settings refer to the field application functions 3 WAY VRF SYSTEM 9 Demand Control Control Functions Serial parallel UO must be connected in order to perform demand control The below input is received by serial parallel I O and demand control is performed The demand values can be set as needed with this device For more information refer to the field application functions Demand setting Demand meanin Contact 1 Contact 2 Control emand meaning Operates to maximum capacity O x Rated current OO O X EO O O Operates at
137. pressure sensor 2 Low pressure sensor failure Identification of a failure caused by a loose or displaced connector is based on the relationship between the temperature detected by the low pressure sensor and the various temperature thermistors Before concluding that a failure has occurred check for a difference between the low pressure measured by the manifold gauge and the pressure detected by the low pressure sensor LS High pressure sensor failure Low pressure sensor failure Alarm display 3 WAY VRF SYSTEM 17 Backup Operation Control Functions lt Field Application Functions gt 17 1 Automatic Backup Operation This system includes a function for automatic backup operation An alarm is also displayed to inform the operator that a failure has occurred 1 Alarms that result in automatic backup operation When compressor trouble or fan motor trouble makes emergency continued operation impossible automatic backup operation mode is engaged Automatic backup mode is not engaged in cases of communications alarms automatic reset alarms and other instances when emergency operation is possible by pressing the remote controller buttons or changing other conditions The alarms that result in automatic backup mode are P16 P22 P26 P29 H11 H12 and H31 2 Start of automatic backup operation If the above alarms occur the alarm is displayed on the control device Pressing the control device button again starts automatic backup m
138. ps and GET buttons for 4 seconds address and other d settings Automatic address _ Au ii setting based on Press and hold the and utomatic the wired remote for 4 seconds or longer controller or longer Entire system stops Press and hold the and p th ress the Address change weit address the timer operation buttons for 4 seconds or longer Change of indoor button 3 WAY VRF SYSTEM Remote Controller Functions 3 Remote Controller Servicing Functions Test Run Function wm Operates the unit with the thermostat forced ON iP SS lt Procedure gt Press and hold the button for 4 seconds or longer Q Test appears on the remote controller LCD display Fig 4 3 S 3 Start operation I PROGRAM COPY 4 Press the button to return to normal remote ED controller display o 3 WAY VRF SYSTEM 3 Remote Controller Servicing Functions Remote Controller Functions HM Sensor Temperature Display Function displayed regardless of whether unit is operating or stopped The procedure below displays the sensor temperatures from the remote controller indoor unit and outdoor unit on the remote controller lt Procedure gt Press and hold the and buttons simultaneously for 4 seconds or longer Q The unit No X X main unit No item code XX sensor addr
139. psig 5 Torr To ensure proper evacuation refer to the operating instructions that came with the vacuum pump High pressure outlet port For 5 16 7 94mm dia connector Low pressure outlet port For 5 16 7 94mm dia connector Fig 2 13 7 2 Evacuating Refrigerant Tubing Between Indoor and Outdoor Units Refer to the Installation Instructions that came with the outdoor unit 3 WAY VRF SYSTEM 8 Charging Compressor Oil Outdoor Unit Repair Procedures 8 1 If Refrigerant Has Already Been Charged to Outdoor Unit Be sure to use an exclusive oil charging tank for charging compressor oil Prior to charging carry out vacuum drying inside the tank and take care that no air in the form of bubbles is permitted to enter the tank The oil charging procedures are given below The receiver tank used for maintenance may be used as an exclusive oil charging tank When installing the oil charging PER OE tank to the refrigerant system to serve as a safety bypass circuit for refrigerant connect it to the suction line service port carefully to avoid releasing refrigerant into the atmosphere Receiver tank CV6380152988 Perform oil charging pe Nezen work carefully so that no liquid refrigerant enters the charging tank Fig 2 14 1 Evacuation drying in oil charging tank With the lower side valve fully closed open th
140. pulse output a simplified measurement method is used Set the tester to the 12 V range if the value displayed is approximately 4 V then the voltage is normal When the voltage is normal measure the resistance between each pair of pins on the electronic control valve connector The connector is normal if all results pin 5 pin 1 pin 5 pin 3 pin 6 pin 2 pin 6 pin 4 are approximately 460 If the results are OQ or replace the coil e MOV2 Measure the voltage between plug pin 5 and pins 1 through 4 at the CNO16 connector 6P RED on the outdoor unit control PCB Because of the pulse output a simplified measurement method is used Set the tester to the 12 V range if the value displayed is approximately 4 V then the voltage is normal When the voltage is normal measure the resistance between each pair of pins on the electronic control valve connector The connector is normal if all results pin 5 pin 1 pin 5 pin 3 pin 6 pin 2 pin 6 pin 4 are approximately 460 If the results are OQ or replace the coil e MOV4 Measure the voltage between plug pin 5 and pins 1 through 4 at the CN230 connector 6P BLU on the outdoor unit control PCB Because of the pulse output a simplified measurement method is used Set the tester to the 12 V range if the value displayed is approximately 4 V then the voltage is normal When the voltage is normal measure the resistance between each pair of pins on the ele
141. r current detection trouble occurs at an inverter frequency of 80 Hz or higher after start when trouble judgment current is detected in the primary or secondary current or when an instantaneous secondary current of 48 A or higher is detected Probable cause The detection methods are the same as for P16 However the fact that operation up to high frequencies is possible does not necessarily mean that a compressor failure is the cause of the trouble Start the compressor several times If alarm P26 occurs every time and alarm P16 does not occur at all then the possibility of a compressor failure is low Check Pamge 9 S O Notes gt S O P29 Alarm Alarm meaning Inverter compressor missing phase or lock alarm Alarm conditions This alarm may occur at start and occurs when missing phase or lock is detected and when a DCCT failure occurs Probable cause Generally this alarm occurs when the refrigerant pressure balance is uneven at start or when inverter compressor lock occurs there is a missing phase in the inverter compressor wiring or a DCCT failure occurs This can be judged to be starting trouble which is not caused by HIC DCCT failure replace PCB or compressor failure Exampe 19 gt SOS Use a tester to measure the voltage between the DCCT output terminal on the rear of the PCB and the ground If the voltage is not within 2 3 V then the DCCT has malfunctioned Currently the blinking inspection display can be displayed onl
142. r less continuously for 2 minutes or an instantaneous pressure of 2 90 psi or less These values represent abnormal low pressure which may damage the compressor However the alarm does not actually occur the first 4 times that the above operation takes place At these times the outdoor unit is stopped and the conditions are monitored The alarm occurs when the above operation occurs for the fifth time The first 4 times before the alarm occurs are called pre trip After pre trip occurs if the low pressure sensor detects a pressure of 21 8 psi or more for 3 minutes of continuous operation the pre trip count is reset to 0 If the low pressure sensor detects a pressure of 23 2 psi or less continuously for 30 minutes when the compressor is stopped an alarm occurs immediately no pre trip Probable cause The unit low pressure has dropped to a level that does not occur under ordinary conditions 1 The absolute amount of gas in the system is too low as a result of insufficient refrigerant charge or leak 2 The refrigerant has accumulated in the circuit and has not returned to the compressor Refrigerant has accumulated in a location of one way flow and cannot escape High pressure level is low resulting in poor flow of refrigerant in the circuit A lower high pressure level results in a smaller difference between low pressure and high pressure that may be insufficient to cause refrigerant flow 3 The refrigerant circuit has become cl
143. r unit maintenance remote controller and check the item code 80 refrigerant type If the setting is incorrect change it to R410A a 19 Notes The outdoor unit maintenance remote controller is required in order to set the refrigerant type in the outdoor unit EEPROM 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis P03 P17 Alarm Compressor 1 discharge temperature trouble Compressor 2 discharge temperature trouble Alarm conditions Inverter compressor 1 Temperature is 222 F or higher and pre trip stop has occurred Compressors 2 constant speed Pre trip stop occurs at 222 F or above The alarm occurs when pre trip stop occurs more than once However the pre trip counter is cleared if the compressor operates continuously for a specified length of time 1 Clogging of liquid valve capillaries 2 Insufficient amount of refrigerant including trouble resulting from an insufficient initial charge and from gas leakage Blocking of low pressure parts caused by intrusion of foreign objects moisture scale etc Crossing tubing or PCB connectors with the other compressor thermistor Expansion valve operation failure Accumulation of refrigerant at stopped outdoor units Compressor discharge sensor failure Probable cause PCB failure A D conversion failure Electrical noise Clogging of capillaries Trouble Compressor discharge temperature does not decrease even when the liquid valve is ON
144. re SW has not activated the threshold for the detected current is 7A or more continuing for 5 seconds e If the low pressure switch has activated the threshold for the detected current is 7A or more continuing for 2 seconds Probable cause 1 Magnet SW malfunction e The magnet SW has seized and the compressor is continuing to run gt Even when the power is turned OFF the primary side and secondary side contacts remain together e The conditions of magnet SW operation are poor difficult to open When a magnet SW is used in a DC circuit it may be difficult for the SW to open at times In an AC circuit the magnet SW should open instantaneously as long as the current is within the allowable range However this kind of trouble can occur if excessive current flows and may prevent the SW from opening 2 CT circuit failure or PCB failure A D failure e CT circuit contact failure Check that the connector is not partially disconnected Wiggle the connector to check the connection These symptoms will not occur if the connector is completely disconnected or the wire is cut In these cases alarm Hx3 occurs e Current of 7A or higher was detected although the compressor was stopped or a higher current was detected at occasional intervals e The compressor continues to operate at a time when the outdoor unit should be stopped such as when all indoor units are stopped Check whether or not 200 V is output from the PCB to the magnet S
145. re to the lower valve For 5 16 7 94mm dia connector refrigerant recovery unit Fig 2 18 To terminate the oil charging work do as follows To end the charge process first close the valve on the high pressure side of the manifold gauge Then wait several tens of seconds after the pressure display on the manifold gauge low pressure gauge stabilizes in order to equalize the pressure with the low pressure outlet port and to vaporize the refrigerant in the charge tank Then perform steps 1 and 3 in sequence and fully close the valves Finally connect the refrigerant recovery unit to the Lo gauge side shut down all indoor and outdoor units and then recover the remaining refrigerant in the oil charging tank manifold gauge valves and connecting hoses Perform these procedures quickly and securely so that no air can enter After charge the necessary amount of new refrigerant by referring to the Installation Instructions that came with the outdoor unit To determine the completion of refrigerant recovery follow the instructions that came with the refrigerant recovery unit 8 2 If Outdoor Unit Has Not Been Charged with Refrigerant When a compressor has been replaced or in any other case where the outdoor unit has not been charged with refrigerant first charge with refrigerant then follow the instructions in 8 1 If Refrigerant Has Already Been Charged to Outdoor Unit and charge with oil Or alternatively follow the proced
146. rease by 0 5 horsepower 2 212 Less than 217 Prohibit horsepower increase 1 208 Less than 212 Permit horsepower increase 0 Less than 208 No control The values shown in the table above are reduced to the values calculated by roadmap control 3 WAY VRF SYSTEM 4 Special Controls Control Functions 2 Current protection Inverter compressor current control is composed of primary current control and secondary current control Current protection control for the inverter compressor is performed by self protection in the inverter circuit and does not increase or decrease the compressor capacity o Operation stops instantaneously due 75 or 302 F Thermostat OFF to activation of hybrid IC Thermostat OFF Operation stops for Primary current Secondary current 25 32 5 Horsepower decreased 24 Less than 25 Prohibit horsepower increase Less than 24 Permit horsepower increase 3 6 5 Roadmap control after trip When restarting after trip stop occurs the horsepower may increase slowly depending on the trip counter value 1 If Trip counter 1 the horsepower increases at a speed that is 1 2 of ordinary roadmap control 2 If Trip counter 2 the horsepower increases at a speed that is 1 3 of ordinary roadmap control The trip counter is cleared if no trip occurs within 10 minutes after operation starts 1 10 3 WAY VRF SYSTEM 4 Special Controls Control Functions In addition to ordinary heating and c
147. recovery control is in progress B This valve is ON when unit refrigerant oil recovery control is in progress oil supply unit C This valve turns ON for 30 seconds each time a constant speed compressor starts D This valve turns ON for 60 seconds after defrost control ends 6 4 Recovery Valve ORVR This valve recovers refrigerant oil from the balance tube to the compressor 1 When unit is stopped This valve is always OFF 2 When unit is operating A This valve is ON when separator oil self recovery control is in progress B This valve is ON when unit refrigerant oil recovery control is in progress oil receiving unit C This valve is ON when control for insufficient gas is in progress D This valve turns ON for 60 seconds after a constant speed compressor starts E This valve turns ON for 120 seconds after defrost control ends F This valve turns ON for 10 seconds after the outdoor unit stops G This valve remains OFF at all times other than A F above 6 5 Bypass Valve BPV This valve flushes the oil from the balance tubes In addition it is used for recovering refrigerant from stopped outdoor units during cooling operation 1 When unit is stopped This valve is always OFF 2 When unit is operating This valve is ON at the oil supply outdoor unit when unit refrigerant oil recovery control is in progress This valve repeatedly turns ON OFF at regular intervals during unit refrigerant oil recovery c
148. rect adjustment of the refrigerant level based on false detection caused by refrigerant accumulation or recovery at stopped outdoor units stopped due to failures of functional elements After the judgment is displayed repeated judgment will occur under new operating conditions if all outdoor units continue operating Therefore the judgment display may change when later judgments occur Judgment mode is automatically canceled after 4 hours 3 WAY VRF SYSTEM 19 Other Functions Control Hunctions 3 Outdoor unit PCB LED indications in judgment mode OO LED1 LED2 Recommended response EN KE E ES SE Ke ae ee EE possible alternately When judgment mode is not engaged the LED indicates the normal display OFF or else indicates alarms or other information If the insufficient gas or overcharge judgment is not stable then recover refrigerant a little at a time when the overcharge display appears End refrigerant adjustment when the normal or insufficient gas display appears 4 Canceling judgment mode When judgment mode is cancelled the LED returns to the standard status display OFF unless an alarm or other event has occurred 1 Automatic cancel Judgment mode is canceled automatically when 4 hours have passed after it was started 2 Forced cancel Short circuit the CHECK pin while the judgment mode display is active in order to cancel judgment mode lt Reference gt General Guidelines for Insufficient Gas and Overcha
149. refrigerant pipes are intact 5 1 2 Oil level detection Excess oil in the compressor is sent by bypass via a capillary tube to the low pressure circuit The temperature detected by a temperature sensor is used to determine whether it is oil warm or refrigerant cold 5 1 3 Self separator oil recovery control When a low oil level is detected this control recovers the oil which has accumulated in that oil separator and sends it to the compressor 1 Operation when oil level is 1 30 seconds after the oil level changes from 2 to 1 both the balance valve and recovery valve turn ON for up to 2 minutes However if the oil level becomes 2 during these 2 minutes this control is stopped When this control has been stopped it will not restart for 3 5 minutes unless the oil level becomes 0 2 Operation when oil level is 0 Both the balance valve and recovery valve turn ON and remain ON 5 1 4 Unit refrigerant oil recovery control utilizing balance tubes If the low oil level continues that outdoor unit oil receiving outdoor unit receives a supply of oil from operating outdoor units where the oil level is not low oil supply outdoor units 1 Control at the oil supply outdoor unit begins 3 minutes after the oil level at the outdoor unit changes to 0 or 1 Oil supply is performed for a maximum of 5 minutes from each unit 2 When oil supply is ended oil supply from that outdoor unit will not occur again for a period of
150. remote controller as the priority remote controller the remote controller which is given priority for selecting the operating mode If 2 or more remote controllers are set as priority remote controllers an alarm will occur at the remote controllers and operation will not be possible When the priority remote controller is set to the operating mode for control then all other remote controllers can select only the permitted operating mode regardless of whether the priority remote controller is operating or stopped When a controlled remote controller is operated Operation change control in progress is displayed Set mode at priority remote controller Modes that can be selected at other remote controllers Cooling or dry Cooling dry fan Heating fan Fan Whichever mode heating cooling is selected first There are other methods to avoid control in which the mode selected first takes priority Methods of remotely controlling the operating mode 1 Use the central functions of a central control device 2 Use a remote control relay PCB at the outdoor unit 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions When the operating mode at the priority remote controller is changed the operating modes of other remote controllers change as shown below Mode change at priority remote controller Operating modes at other remote controllers l Cooling or dry Heating Cooling or dry Heating Fan Fan n
151. rge Judgment in automatic judgment mode can be problematic in some cases Therefore the following guidelines are provided for general judgment of the refrigerant amount e Symptoms of insufficient gas Cooling There is an indoor unit where the position of the electronic control valve is much higher open by operation 300 pulses or more than it was at start and the difference E3 E1 at that indoor unit is large 30 F or more Heating There is an outdoor unit where the position of the electronic control valve is much higher open by operation 300 pulses or more than it was at start and the difference Liquid temp Gas temp at that outdoor unit is large 30 F or more e Symptoms of overcharge Cooling The high pressure sensor temperature is 134 F or higher and the difference Pressure sensor operation temp Liquid temp at that outdoor unit is large 30 F or more Heating There is an indoor unit where the position of the electronic control valve is much higher open by operation 300 pulses or more than it was at start and the difference Pressure sensor temp E3 at that indoor unit is large 50 F or more These are only guidelines therefore the judgment may vary depending on the installation conditions load characteristics and other elements 3 WAY VRF SYSTEM Contents Outdoor Unit Repair Procedures 2 OUTDOOR UNIT REPAIR PROCEDURES 1 Removing Panels e ee EE EE EE E eee 2 2 2 Removing
152. ring cooling operation mechanical valve mechanical valve bypass check valve sound of refrigerant flow can be heard and stops when the liquid valve is closed hot gas defrost valve if valve secondary side remains hot even after much time has passed be careful not to mistake transmitted heat for a valve failure Ice is growing on the lower parts of some outdoor unit heat exchangers but not on others Because this trouble may occur even in outdoor units with a high operating rate yr under conditions of insufficient gas caution is needed 6 Sensor failure Check This alarm is likely to occur when wiring is partially cut It is difficult to identify even when continuity is checked The detected discharge temperature is high e Although such conditions rarely occur a P02 alarm is likely if the detected discharge temperature is low e Replace the sensor with another discharge sensor and compare the temperature conditions 7 If the cause is still unknown after checking the above then it is possible that electrical noise is the cause of the trouble 3 4 5 6 7 8 9 1 Check Continued 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis Correction 1 Replace the sensor 2 Replace the outdoor unit PCB 3 Correct the problem locations All of the probable causes Notes Operates continuously for a set length of time Indicates 2 5 minutes or longer for an inverter unit and 30 seconds
153. rocedures Be sure to turn off the power before removing the electrical component box Then check that the power LED D53 on the control PCB of the outdoor unit is not lit 1 Remove the electrical component box cover remove 6 screws Fig 2 3 Electrical component box cover ES de Ai F ER el Er Er SZ a 2 Remove power and control wires from terminals 3 Remove internal wires with extended connectors on the outdoor control PCB Solenoid valves thermistors crankcase heaters and others 4 Disconnect power lines connected to the secondary terminals of the magnetic contactor for the compressor 5 Remove the electrical component box remove 2 screws Fig 2 4 Electrical component box Nezen Be sure to release the locking mechanism before disconnecting each connector 6 Remove the center duct Fig 2 5 X The center duct is fitted into the upper and lower ducts and held in place by the electrical Center duct component box an arrangement that makes possible independent removal of the center duct b eh Sail ap H Uh te ll Lower duct 2 Removing Electrical Component Box and Duct 7 Remove the lower duct 2 screws 1 tab Fig 2 6 8 Remove the upper duct 3 screws Fig 2 7 Lower duct N EZ Sn H E AVP d dn g d ie ES 3 WAY VRF SYSTEM Outdoor Unit Repair Procedures ER K es SE i SIS A i I
154. roller This setting establishes a shift temperature for the heating auto heat cool mode cooling temperature setting relative to the remote controller temperature setting Cooling temperature setting Shift temperature Remote controller temperature setting Shift temperature Heating temperature setting 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions Come we 1F Upper limit 20 Lower limit SE 21 Upper limit Heating This setting changes the temperature range upper limit and lower limit 22 Lower limit Change to the remote which is set from the remote controller or central control device control temperature The set upper limit must be greater than or equal to the lower limit If the 23 Upper limit setting range temperature setting is to be a single point set the upper limit and lower 24 Lower limit limit to the same temperature 25 Upper limit Auto 26 Lower limit heat cool During heating operation the humidifier operates when the heat Humidifier operation which ignores exchanger temperature is suitable for humidifying This setting is the heat exchanger temperature used to ignore this condition for humidifier operation and operate the humidifier more Filter input switching This setting switches the filter input according to the purpose of use This setting indicates whether or not an indoor unit electronic control valve is present At the time of
155. s Compressor Control Table Low lt Condensation Temp Tc gt High A B C D A UP not UP B slow UP STOP C not UP DON Low lt Evaporation Temp Te High Evaporation temperature Te and condensation temperature Tc areas A B C and D are the same as for evaporation temperature control and condensation temperature control 2 Increasing decreasing the heat exchanger capacity when the outdoor unit heat exchanger is functioning as a condenser e Primarily when both the evaporation temperature Te and condensation temperature Tc are high This occurs when the cooling capacity heat intake is low and the heating capacity heat discharge is high The outdoor heat exchanger capacity is increased increasing the system condensation capacity and lowering the condensation temperature Tc The amount of heat discharge at the outdoor unit heat exchanger increases increasing the heat intake at the Cooling mode indoor units and lowering the evaporation temperature Te Primarily when both the evaporation temperature Te and condensation temperature Tc are low This occurs when the cooling capacity heat intake is high and the heating capacity heat discharge is low The outdoor heat exchanger capacity is decreased decreasing the system condensation capacity and raising the condensation temperature Tc The amount of heat discharge at the outdoor unit heat exchanger decreases decreasing the heat intake at the
156. s decreasing the heat discharge at the Heating mode indoor units and lowering the condensation temperature Tc Outdoor Heat Exchanger Control Table when the outdoor heat exchanger is functioning as an evaporator Low lt Condensation Temp Tc gt High A B C D STAY Q 2 7 O N N D Q E O UP O STAY Low lt Evaporation Temp Te High 3 6 4 Protection control Protection control consists of 2 types of protection air discharge temperature protection and current protection The limit values from this protection control are incorporated into the output compressor capacity increase decrease values that were calculated from control based on the temperature at the indoor unit heat exchanger roadmap control In some cases the control shown below may stop the compressor issue a warning or reduce the compressor capacity 1 Air discharge temperature protection During operation when only a single outdoor unit is installed the air discharge temperature level is determined the highest value is used and the compressor capacity is limited by using the air discharge temperature of the operating compressor as shown in the tables below Air discharge temperature level Highest level among the air discharge temperature levels of all compressors Air discharge temp level Discharge temp Horsepower limit 5 221 Decrease by 2 horsepower 4 219 Decrease by 1 horsepower 3 217 Dec
157. s YY Address at outdoor unit sub bus item code number DN value in the table below and the setting data 8 digits Fig 3 6 The setting data is displayed in 8 digits The display changes between the first 4 digits Fig and the last 4 digits Fig When the first 4 digits are displayed the bottom dot of the colon is lit To end the setting mode press the CHECK button The display returns to the normal display mode A Display of first 4 digits Display of last 4 digits IG r E Gi h lt Refrigerant type gt A and 8 are displayed alternately Example shows 0000 0410 R410A List of Item Codes DN Parameter Description moon unit capacity 0 Disabled 224 72 Type 280 96 Type 3 WAY VRF SYSTEM Remote Controller Functions Contents 4 REMOTE CONTROLLER FUNCTIONS 1 Simple Settings Function 000 c eee 4 2 2 Detailed Settings Function 0 0 4 4 3 Remote Controller Servicing Functions 0 0000 ee 4 15 1 Simple Settings Function e This allows the filter lifetime operating mode priority change central control address and other settings to be made for an individual or group control indoor unit to which the remote controller used for simple settings is connected When simple set
158. s of the new compressor Nezen When setting the compressor into the unit be careful not to cause any abnormal deformation of the tube with flare nut D Place the remaining cushioning rubber onto the new compressor at the position shown in the figure below Remove the bolts that are temporarily fastening the pieces of cushioning rubber inner 2 legs and anchor the 3 compressor legs using the bolts washers and rubber washers Remove the flare nut from the new compressor and connect the tube with flare nut Shape the tubes and insert them at the 2 welding locations Connect a manifold gauge to the high and low pressure outlet ports at the outdoor unit where the compressor was replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement 10 Perform copper brazing at the 2 welding locations 11 Follow the instructions in 6 Checking for Leakage After Repair and check for leaks at the outdoor unit where the compressor was replaced SG Nezey At this time also check for leaks at the flare nut connection on the tube with flare nut 12 Re install all components that were removed Re install the electrical component box in the same position as it was before Be sure to check for looseness of the power terminal connections at the compressor Nezey terminal plate and to check by pulling vertically on the connections If the terminals become disconnected easily replace the wiring
159. s that heating cooling operation is not mixed and that all units are operating in either Heating or Cooling mode 5 Use the outdoor unit maintenance remote controller to check the operating status of the indoor units Check that all units are operating in Heating mode For details concerning operation of the outdoor unit maintenance remote controller refer to the Outdoor unit maintenance remote controller item With the 3 way valve it is difficult to determine whether operation is heating or N re cooling by touching the tubing 6 Close the suction tube and balance tube on the outdoor unit to be repaired Then slowly close the liquid tube service valve 7 When the low pressure at the outdoor unit to be repaired reaches 72 5 psi or below press the ON OFF button on the outdoor unit maintenance remote controller to stop all the units Then immediately fully close the discharge tube valve on that outdoor unit While closing the valves the rise in discharge temperature or another factor may Nezey cause a protective device to activate stopping the operation of the outdoor unit If this occurs immediately fully close the discharge tube valve on the outdoor unit to be repaired 8 Connect the high pressure gauge side of the manifold gauge to the high pressure outlet port on the outdoor unit to be repaired and connect the manifold gauge to the refrigerant recovery device Be sure that no air enters the tubing at this time 9 Sh
160. se cycle defrost control Heating Z Z O E O O O Ces av N O Fan PE Thermostat Cooling control according to indoor unit capacity Thermostat Thermostat Heating control according to indoor unit capacity Thermostat System refrigerant Aii indoor unis aaa for cooling according to indoor unit See All indoor units Outdoor cycle Cooling defrost control heating Z Z EIER 3 WAY VRF SYSTEM 11 Solenoid Valve Kit Control Control Functions This device connects the solenoid valve kit which is used to switch between indoor unit cooling heating for 3 WAY types Operation of the cer type E1 solenoid valve kit e ae et ae valve valve valve temp control valve KE OFF Thermostat ON Thermostat Operation of the type E1 solenoid valve kit Discharge Intake Balance EP valve evaporation valve valve valve temp control valve Thermostat OFF ON OFF Thermostat ON 3 WAY VRF SYSTEM 12 Indoor Special Control Control Functions 12 1 Switching Control EC control If the settings indicate that an RAP valve kit is present for type E1 the setting on initial shipment from the factory is present then the thermostat does not turn ON for 3 minutes after the indoor unit operating mode is changed from any mode other than heating including stopped to heating with thermostat ON This is done in order to bal ance the pressure within the heat exchanger With type E1
161. shipping this setting is set according to the conditions of the indoor unit 2C Indoor unit electronic control valve Ordinarily the T10 terminal is used as the HA terminal at the time of T10 terminal input switching shipping However this setting is used when the T10 terminal is used for OFF reminder or for fire prevention input It is possible to install a total heat exchanger and ventilation fan in the system which can be started and stopped by the wired remote controller The ventilation fan can operate linked with the start and Pope stop of the indoor unit or can be operated even when the indoor Ventilation fan operation from GC remote controller mes Use a ventilation fan that can accept the no voltage A contact as the external input signal In the case of group control the fans are operated together They cannot be operated individually This setting is used to switch from the body sensor to the remote controller sensor Check that remote controller sensor is displayed Do not use this setting with models that do not include a remote controller sensor Do not use this setting if both the body sensor and remote sensor are used Switching to remote controller sensor In a MULTI system with multiple remote controllers switching between heating and cooling is restricted and Operation change control in progress is displayed This setting is used to prevent this display from appearing Refer to the item concerned
162. so removing a coil that is off will not produce such a sound 12 Check whether too much refrigerant has been charged Too much refrigerant has been charged if the sub cool temperature of the condenser is 59 F or more Replace damaged components and correct the amount of charged refrigerant Exampe 19 S O Notes gt S Probable cause ok N OO zl OO P Lob P05 Alarm Alarmcode PB o Alarm meaning Reverse phase or missing phase detected Alarm conditions This alarm occurs when a reverse phase or missing phase is detected in the L1 L2 L3 phases Probable cause Reverse phase or missing phase in the L1 L2 L3 phases Check Check the wiring at the power terminal plate Correction Switch the phases and reinsert Check if the result is OK Example Notes S 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis P16 Alarm Alarm code PG S Alarm meaning Compressor 1 INV overcurrent alarm Alarm conditions This alarm occurs when current trouble or current detection trouble occur at an inverter frequency of less than 80 Hz after start when trouble judgment current is detected in the primary or secondary current or when an instantaneous secondary current of 48 A or higher is detected Probable cause There is a strong possibility of a compressor failure An alarm occurs for current detection trouble when it is judged that no current is flowing after start DCCT is damaged In this case the cause is a D
163. splay of individual outdoor unit alarms e Total operating time of outdoor unit compressors e Oil level of the outdoor unit oil sensor e Total outdoor unit power ON time e Outdoor unit microcomputer version other information HM Temperature monitor e Displays the indoor outdoor unit sensor temperatures M Outdoor unit alarm history monitor e Displays the outdoor unit alarm history E Mode settings e Setting mode 1 and setting mode 2 are used to make the outdoor EEPROM setting 3 WAY VRF SYSTEM Outdoor Unit Maintenance Remote Controller 3 Ordinary Display Controls and Functions M Functions on the ordinary display Connect the special service checker wiring to the outdoor unit PCB The connection is shown in the figure below Outdoor unit PCB RC 3P BLU PCB connector 3P BLU KN Special service checker wiring Relay connector 2P WHT Remote controller Ass y If the communications line in the inter unit control wiring is connected it can be left as is In case of an independent outdoor unit 1 maintenance remote controller connected to 1 outdoor unit automatic address setting for indoor units not completed both setting mode 1 and setting mode 2 can be used The overall system status for that refrigerant system is displayed 3 WAY VRF SYSTEM 3 Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller All un
164. ssor center H11 H12 H13 Compressor 2 constant speed compressor 1 left side when viewed from front A judgment is made based on factors that include the following coil resistance varies depending on the compressor insulation resistance current leakage breaker operation oil and refrigerant fouling odor pressure and noise Reference Insulation resistance Use a DC 500 V insulation resistance meter and measure the insulation resistance between the electrified and non electrified parts 2 Electrical trouble gt a Motor gt Min 300 MQ b Compressor Min 100 MQ servicing part c Unit Min 10 MQ This is due to the presence of refrigerant which decreases the insulation resistance Minimum insulation resistance as required by generally accepted requirements is 1 MQ JUDGMENT START Is there burning of the failed Follow the instructions in compressor motor NO 3 Discharging Compressor Oil YES and drain the oil from the failed compressor Then inspect Follow the instructions in Is the color phase 4 0 or above or is a 3 Discharging Compressor Oil and YES sharp odor present drain the oil from all compressors in the same system Then inspect NO Are there 2 or more outdoor units where the compressor oil color phase is 4 0 or higher or where a sharp odor is present NO YES Go to 10 2 3 Replacing all Go to 10 2 2 Replacing all Go to 10 2 1 Replacing o
165. stop pin CN104 to stop operation 7 Short circuit the mode change pin CN101 on the outdoor unit control PCB of the No 1 unit Switching of the 4 way valve occurs immediately before operation starts Therefore it does not change at this time Mode change cannot be judged from the sound 8 Short circuit the test run pin CN023 on the outdoor unit control PCB of the No 1 unit Then check the displays of the indoor unit remote controllers Check that all units are operating in Cooling mode 9 Close the suction tube and balance tube on the outdoor unit to be repaired Then slowly close the liquid tube service valve 10 When the low pressure at the outdoor unit to be repaired reaches 72 5 psi or below pull out the SCT connector 2P YEL CN231 from the outdoor unit control PCB of that outdoor unit Then immediately fully close the discharge tube valve on that outdoor unit Pulling out the SCT connector immediately stops all of the outdoor units While closing the valves the rise in discharge temperature or another factor may cause Nezey a protective device to activate stopping the operation of the outdoor unit If this occurs immediately fully close the discharge tube valve on the outdoor unit to be repaired 11 Connect the high pressure gauge side of the manifold gauge to the high pressure outlet port on the outdoor unit to be repaired and connect the manifold gauge to the refrigerant recovery device Be sure that no air
166. stopped outdoor unit and has not returned as a result of refrigerant circuit clogging or valve leakage at the stopped outdoor unit 5 A valve ORVR BALV BPB in the oil circuit has malfunctioned or there is clogging of the circuit capillaries which returns oil from the oil separator to the compressor 6 If an excessive amount or liquid returns to the compressor oil foaming may increase oil discharge The same occurs when the refrigerant proportion in the compressor is high at start due to an open circuit in the crank case heater Check the tubing length and height differences Check the operation of system circuit valves Check that there is not an excessive amount of liquid return Check that there is no mechanical valve leakage Check the crank case heater wintertime Check that the oil sensor is not disconnected and that the circuit is not open Correction 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis H08 H27 Alarm Alarm meaning H08 Trouble open circuit with the oil sensor connection at compressor 1 H27 Trouble open circuit with the oil sensor connection at compressor 2 Alarm conditions This alarm occurs when a connector connection pins 1 and 2 for compressor 1 pins 4 and 5 for compressor 2 is open Correction 1 Connect the connector k 2 Correct the connection at connector pins 4 and 5 Exampe _ J gt S Notes o O H31 Alarm aiarmoode Je OOO O OOO HIC trouble alarm
167. structions in 10 2 4 Dry core cleaning and perform dry core cleaning of all outdoor units 3 WAY VRF SYSTEM 10 C ompressor Outdoor Unit Repair Procedures 10 2 4 Dry core cleaning If burning or other failures occur repeatedly at compressors within the same system in many cases the cause is acid sludge carbon or other substances that remain in the refrigeration cycle as the result of insufficient cleaning If when the oil is inspected there is an outdoor unit where the oil color phase is 4 0 or higher or where a sharp odor is present carry out all steps below to perform dry core cleaning A If a ball valve is installed on the outdoor unit 1 Refer to 5 2 1 Cooling operation for all units and operate all outdoor units in either Heating or Cooling mode 2 Ifall units are operated in Cooling mode close first the liquid tube service valve then the ball valve on all outdoor units where dry cores will be attached If all units are operated in Heating mode close first the ball valve then the liquid tube service valve on all outdoor units where dry cores will be attached This step is performed in order to expel refrigerant from the tubing between the liquid tube service valve and the ball valve Approximately 4 5 seconds is a sufficient interval between closing each of the 2 valves 3 Press the ON OFF button on the outdoor unit maintenance remote controller to stop the operation of all units If the outdoor u
168. system will not operate if no outdoor unit has been set as unit No 1 Required settings for Test Run Outdoor unit No 1 Outdoor unit Nos 2 At time of shipment On site setting At time of shipment On site setting System address System 1 30 No of indoor units 1 40 units No of outdoor units Unit No 1 Unit Nos 2 This system can be expanded to connect a maximum of 3 outdoor units The system maximum capacity is 24 Ton The CCU functions are disabled at all units except the unit that is set as unit No 1 Therefore no problems will result even if the system address No of indoor units and No of outdoor units settings are made at the other units However making these settings may be convenient for manual backup operation as it eliminates the necessity of making the settings again if unit No 1 fails If unit No 1 fails and the power supply to it is interrupted it will be nec essary to set a different unit as unit No 1 in order to use manual backup operation 3 WAY VRF SYSTEM 2 Selecting an Outdoor Unit for Operation Control Functions 2 1 Outdoor Unit Operating Rules Because in this system all outdoor units contain an inverter compressor ordinarily there is no absolute order of priority for compressor operation Therefore there is no order of priority for the outdoor units However it is possible to operate the outdoor units in sequence beginning with unit No 1 by using the outdoor unit maintenance rem
169. t Stop Rules 1 Simultaneous stop of multiple outdoor units When all outdoor units or multiple outdoor units must stop the units stop at the same time However depending on the communications timing a difference of approximately 10 seconds may occur 2 Stopping individual outdoor units amp The last unit to stop operating is the outdoor unit that contains the inverter compressor with the shortest amount of operating time ifthe indoor load decreases and it becomes necessary to reduce the number of operating outdoor units the compressors are stopped individually in sequence When all compressors installed in an outdoor unit have stopped that outdoor unit also stops 3 WAY VRF SYSTEM 3 Compressor Control Control Functions 3 1 Compressors Mounted in the Outdoor Units U 72MF1U9 U 72MF1U9E U 96MF1U9 U 96MF1U9E Capacity On Installed DC Inverter DC Inverter compressor Compressor2 Go sam hp horsepower Constant speed INV Compressor 1 Compressor 2 Compressor 1 Type 72 Type 96 3 2 Compressor Selection Rules Because all outdoor units in this system contain an inverter compressor ordinarily there is no absolute order of priority for compressor operation 1 Normal compressor operation sequence set at time of shipment At least one inverter compressor is always operating in order to make fine adjustments to the system lower limit capacity When multiple outdoor units are connected ea
170. t is necessary to connect a PC or other instrument Correction 1 Replace the compressor 2 Replace the CT circuit 3 Repair the power circuit 4 Adjust the primary side power Repair the power wiring 5 Replace the outdoor unit PCB 6 Correct the trouble In the case of a compressor failure it is likely that steps must be taken to correct the cause of the compressor failure Such as liquid back up in order to prevent recurrence Be sure to check that there is no cause which may resuit in compressor locking Exampe 9 S O 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis HO3 H13 Alarm H13 Compressor 2 CT sensor disconnected or short circuit Alarm conditions Compressor 1 Current value of more than 18 0 A is detected while the compressor 1 is stopped Compressor 2 Current value at compressor 2 is less than 2 0 A when 2 seconds or more had passed after the compressors began operation and output No current is detected even though the compressors are operating Probable cause CT circuit failure including cut wiring etc Disconnected CT circuit connector Missing phase where CT circuit is connected This CT circuit is connected to the connector of the other CT circuit PCB failure Electrical noise CT circuit failure PCB failure Trouble Current value during compressor operation is below the threshold value Check Check that the connector is not disconnected e Check the continuity of the CT circu
171. t on the outdoor unit employs a Schrader type valve 11 2 Removing the Low Pressure Sensor 1 Follow the instructions in 1 Removing Panels and 2 Removing Electrical Component Box and Duct and remove the corresponding components from the outdoor unit where the low pressure sensor will be removed If there is sufficient space to allow removal of the left side panel then it is possible to remove the low pressure sensor without removing the electrical component box and duct 2 Disconnect the low pressure sensor connector 3P WHT from terminal CNO24 on the outdoor unit control PCB of the outdoor unit where the low pressure sensor will be removed 3 Use 2 adjustable wrenches in combination to remove the low pressure sensor Jm When removing the low pressure sensor internal pressure will be applied by the refrigerant in the outdoor unit The low pressure sensor connection port on the outdoor unit employs a Schrader type valve 11 3 Installing the High and Low Pressure Sensors 1 Use 2 adjustable wrenches in combination to install the high and low pressure sensors J D Low pressure sensor High pressure Sensor 3 WAY VRF SYSTEM 12 Replacin g 4 way valve Outdoor Unit Repair Procedures When replacing 4 way valve of type 72 for type with the inverter compressor be sure to protect check valves which are located adjacent to the 4 way valve while performing replacement work Type 96 for type with 1 or
172. t outdoor heat exchanger 1 Gas temperature sensor trouble at E or erenangar a oar NOR eehanger 1 As 1em peraire seneor abia at 1 A D step is 10 steps or less short circuit 2 A D step is 1014 steps or more open circuit 1 Sensor malfunction including connector 2 PCB malfunction 1 Measure the sensor resistance Check that the sensor is operating normally 2 Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer F07 F24 Alarm Alarm meaning Liquid temperature sensor trouble at outdoor heat exchanger 1 Liquid temperature sensor trouble at outdoor heat exchanger 2 Alarm conditions 1 A D step is 10 steps or less short circuit 2 A D step is 1014 steps or more open circuit Probable cause 1 Sensor malfunction including connector 2 PCB malfunction Check 1 Measure the sensor resistance Check that the sensor is operating normally 2 Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis FO8 Alarm Alarm code FOB utdoor air temperature sensor trouble 2 A D step is 1014 steps or more open circuit 2 PCB malfunction J 2 Check Measure the sensor resistance Check that the sensor is operating normally Use a remote controller monitor or PC monitor to check the temperature that is recognized by the microcomputer
173. tcomeciedindoorunis fo Be Unit Nos of connected indoor unit me Operating status of indoor unit By Thermostat ON status of indoor unit 8S No of connected outdoor units D Unit Nos of connected outdoor units a es Operating status of outdoor unit compressor OO D Compressor 1 operating time ft Compressor 2 operating time ie Compressor 3 operating time Outdoor unit power ON time 7 Gompressor 1 operation count 48 Compreesor 2 operation count CEET ER Alarm history 1 most recent EI Alarm history 2 F Alarm history 3 FT Alarm history 4 EN Alarm history 5 ER Alarm history 6 FR Alarm history 7 ET Alarm history 8 oldest buttons to change the item code Ite 3 Em Display only Alarm code and unit No of unit where alarm occurred are displayed alternately 0 CCU 1 2 Outdoor unit GA O 3 WAY VRF SYSTEM 3 Ordinary Display Controls and Functions Outdoor Unit Maintenance Remote Controller Ost Locations where and are displayed Displays the outdoor unit sub bus address which is as shown in Fig 3 3 currently selected XX Outdoor system address on main bus line 1 30 YY Outdoor unit sub bus address 1 8 1 appears when there is only 1 outdoor unit lt Sample d
174. tems were stopped due to a power outage or other cause nu No delayed start setting at time of factory shipment Start begins after 1 second x System address Start begins after 2 seconds x System address 2 1 Start begins after 3 seconds x System address 18 4 Automatic Backup Outdoor EEPROM 48 set only on outdoor unit No 1 Automatic backup is set to occur at the time the unit is shipped from the factory However the automatic backup function can be disabled by changing this setting to 1 3 WAY VRF SYSTEM 18 Service Maintenance Functions Control Functions 18 5 Automatic Backup Mode Outdoor EEPROM 49 set only on outdoor unit No 1 Two types of automatic backup modes when multiple outdoor units are installed can be selected Backup outdoor units operate only during special control Setting at time of factory shipment 1 Only the backup compressors remain stopped Other OK compressors installed in the same outdoor unit operate as normal Even when 1 is set the outdoor unit will remain stopped if all of the compressors in the outdoor unit have failed If only 1 outdoor unit is installed the operation is according to setting 1 even if O is set 18 6 Snowfall Input Switching Outdoor EEPROM 4A set at each outdoor unit The snowfall sensor input terminal on the outdoor unit PCB is used for input from the snowfall sensor It is also possible to connect an external timer and use it
175. the amount of time set for the OFF timer has passed after remote controller operation was started Timer function change prohibit This function prohibits changes from being made to the remote controller time setting Smudging control Smudging control is disabled when 0000 is set Stop at time set for OFF timer after operation starts Sets the DC fan tap according to the purpose of use ECH DG tan tap soning Change the settings data at the same time 3 WAY VRF SYSTEM 3 Remote Controller Servicing Functions Remote Controller Functions The remote controller includes a number of servicing functions Use these as needed for test runs and inspections List of Servicing Functions Operation with Press and hold the button Test run forced thermostat ON for 4 seconds or longer Sensor Temperature Press and hold the and temperature display from each buttons for 4 seconds or Current operation is display sensor jonger maintained Press and hold the and Servicing check Alarm history pn 7 display display buttons for 4 seconds or Press the longer Filter lifetime button operating mode Press and hold the and Simple settings priority central buttons for 4 seconds or When setings are made control address longer from a remote controller and other settings the indoor unit where that System address indoor unit address Press and hold the A remote controller is Detailed settings central control connected sto
176. the same amount of new refrigerant has not been completed but no more refrigerant will enter the unit first turn the power OFF at the repaired outdoor unit then remove the short circuit at the AP pin CN102 Then fully open all valves on the suction tube discharge tube liquid tube and balance tube However leave the balance tube fully closed if only a single outdoor unit is installed 8 If backup operation was engaged follow the instructions in 4 Backup Operation and perform backup operation recovery 9 If charging with an amount of new refrigerant equal to the amount of recovered refrigerant was not possible fully close the high pressure gauge valve on the manifold gauge Then while the unit is operating in Cooling mode open the low pressure gauge valve on the manifold gauge and charge with the designated amount of refrigerant When charging with liquid refrigerant add refrigerant a little at a time in order to CAUTION Ave prevent liquid back flow 10 Fully close the low pressure gauge valves on the manifold gauge follow the instructions in 8 Charging Compressor Oil and charge with the necessary amount of oil Also add an amount of oil that is equivalent to the amount that was drained from the oil separators 11 Remove the manifold gauge The connecting port employs a Schrader type valve When disconnecting the hose Jam pressure will be applied from the refrigerant in the outdoor unit 12 Follow the in
177. tialization occurs Read values do not match after writing to non volatile memory is complete Probable cause Memory was not inserted after the PCB was replaced Non volatile memory is installed incorrectly wrong direction bent pins etc Check Correction 19 S O Exampe _ J gt S Notes 9 S O 1 2 1 2 The lifetime of the non volatile memory has been reached 3 1 3 WAY VRF SYSTEM 4 3 WAY VRF Alarm Codes Trouble Diagnosis H11 H12 Alarm H11 Constant speed compressor 2 overcurrent alarm H12 Constant speed compressor 2 lock current alarm Alarm conditions H11 During operation the compressor current value exceeded 20 A for 30 seconds or longer However this alarm is not detected for 4 seconds after the compressor starts H12 During operation the compressor current value exceeded 29 A for 4 seconds or longer However this alarm is not detected for 2 seconds after the compressor starts Probable cause Compressor failure locked or partially locked CT circuit failure including cut wiring Missing power phase Low power voltage PCB failure Compressor failure partially locked Trouble Current value during operation greatly exceeds the value shown above Check When the current for each phase is measured with a clamp meter or similar instrument check that the current value for all phases is not high If MG was forced ON use caution check that compressor noise will not occur or the compressor will n
178. tings mode is engaged operation stops at the individual or group control indoor unit to which the remote controller for simple settings is connected lt Procedure gt GA Press and hold the and E buttons simultaneously for 4 seconds or longer Ban unit No 1 or L EL in the case of HUA group control item code ts and settings data DU XX are displayed blinking on the remote controller LCD display Fig 4 1 At this time the indoor unit fan or all indoor unit fans in the case of group control begins operating If group control is in effect press the UNIT button and select the address unit No of the indoor unit to set At this time the fan at the indoor unit begins operating If unit No 22 is displayed the same setting will be made for all indoor units 4 Press the temperature setting Ca Cv buttons to select the item code to change Press the timer time 7 buttons to select the desired setting data For item codes and setting data refer to the following page 6 Press the button The display stops blinking and remains lit and setting is completed Press the button to return to normal remote controller display 3 WAY VRF SYSTEM Remote Controller Functions Remote Controller Functions Section 3 WAY VRF SYSTEM 1 Si
179. tion 1 The temperatures are 42 8 F or higher at all temperatures sensors installed on the outdoor unit heat exchangers However if there is any other outdoor unit where the defrost end condition has not been met defrost control continues for all outdoor units and system defrost control is not ended Condition 2 The maximum defrost time listed in the table above has elapsed 4 3 8 System defrost end When all outdoor units where defrost control is in effect have met the defrost end conditions defrost control is ended for the system 1 15 3 WAY VRF SYSTEM 5 Other Controls Control Functions 5 1 Oil Control 5 1 1 Oil level Oil a Meaning Cl state sessment Sufficient There is more than an adequate amount of oil in the This is the normal operating state compressor of the system and not a problem Slightly The compressor may contain an adequate amount of oil but Check that oil control recovers oil low it may also contain less than an adequate amount of oil Extremely There is not enough oil in the compressor Check that system oil recovery low control restores the oil level The compressor contains enough oil when the oil level is in the range between level 2 and until it has just become 1 Thus oil level 1 does not mean that the compressor is empty of oil When the compressor reaches oil level 0 during operation the system is likely to run out of oil within 5 to 10 minutes Check for oil leaks and make sure that
180. tion signal Indoor unit is detecting error signal from remote controller and system controller Indoor unit is detecting error e Error in receiving serial communication signal signal from outdoor unit e When turning on the power supply the number of connected indoor units does not correspond to the number set Except R C address is O E04 Heating ready lamp 06 e Group wiring failure of indoor units in the refrigerant system blinking occurring when remote controller is operated immediately e e Ss after automatic address setting Outdoor unit is detecting error e Error in receiving serial communication signal signal from indoor unit e There is an indoor unit which does not send signals when E the power is ON e Duplicated remote controller main setting Improper setting Automatic address setting start is prohibited AP pin was short circuited at time when automatic address E12 setting was started Error of main indoor unit in receiving serial communication error of group control wiring signal from sub indoor units During auto address setting number of connected units EECHER Heating ready lamp SE EES e e x Mismatch in No of outdoor units setting Error of sub outdoor unit in receiving serial communication E29 signal from main outdoor unit Improper setting Connected indoor unit is not a multi unit S P Duplication of main indoor unit address setting in group control ready lamps blinking Group c
181. tions 17 2 Manual Backup If an alarm that does not result in automatic backup occurs frequently possible causes include failure Such as refrigerant leakage of a functional part at an outdoor unit other than the unit where the alarm occurs In this case because the outdoor unit service valve must be closed backup operation must be performed manually 1 Backup operation procedure 1 Disconnecting the failed outdoor unit A Reduce the number of outdoor units set at outdoor unit No 1 by the number of failed outdoor units Then turn OFF the power or disconnect the inter unit communications line at the failed outdoor units B Close all service valves at the failed outdoor units C Reset the power at outdoor unit No 1 2 Disabling operation of 1 compressor At the S010 switch on the PCB of the failed outdoor unit turn ON the switch for the compressor to disable and turn ON the backup switch lt S010 switch gt INV ACi AC2 Backup ON vane OFF A Compressor 1 backup oot B Compressor 2 backup oat e In order to perform simultaneous backup operation for 2 or more compressors use a combination of the switch settings shown above 3 WAY VRF SYSTEM 18 Service Maintenance Functions Control Functions The outdoor unit EEPROM settings can be used for the following functions 18 1 Outdoor Unit Noise Countermeasure EEPROM 05 set at each outdoor unit This unit includes 3 types of Quiet modes Howev
182. to enable nighttime Quiet mode operation seng Gem EK Used for snowfall sensor input setting at time of factory shipment Used for Quiet mode input 18 7 Optional Solenoid Valve Control Operation Setting Outdoor EEPROM C0 set at each outdoor unit No output setting at time of factory shipment Refrigerant shut off valve control for cooling when the outdoor air temperature is below standard conditions External liquid valve control used in special cases when the discharge gas temperature is likely to especially rise 18 8 High Static Pressure Mode Outdoor EEPROM 8F set at each outdoor unit This product can be made compatible with high static pressure by changing the settings By changing the setting item 8F to 6 this product can be made compatible with outdoor unit static pressure of approximately 0 0085 psi 10 hp 3 WAY VRF SYSTEM 18 Service Maintenance Functions Control Functions 18 9 Compressor operating sequence Outdoor EEPROM 46 set at outdoor units which include CCU functions When this setting is set to 1 the compressors start in sequence beginning from the No 1 outdoor unit The setting is 0 at the time of shipment With this setting compressors with lower operating time are started first in order to balance the compressor operating times 18 10 Demand value setting Outdoor EEPROM 1A 1B set at outdoor units that include CCU functions Demand setting i Control D
183. uit is open e If the cause is still uncertain check the following to determine whether a sensor or PCB failure has occurred Step 1 Connect the other compressor discharge sensor or a discharge sensor where the F04 alarm has not occurred to the connector for this compressor on the PCB Measure the temperature at the same point a location where temperature fluctuations are small and check whether there is a temperature difference Difference gt A PCB or sensor failure is possible No difference gt PCB and sensor are normal If an abnormality was found at Step 1 connect the problem compressor sensor to the other compressor connector on the PCB or to the PCB connector of a device where the F04 alarm has not occurred Measure the temperature at the same point a location where temperature fluctuations are small and check whether there is a temperature difference Difference gt Sensor failure No difference gt PCB failure X It is convenient at this time to have a discharge temperature sensor on hand 2 Crossed wiring or installation error Trouble Although the other compressor is operating and this compressor is stopped the discharge temperature of the other compressor does not increase and the discharge temperature of this compressor rises The discharge temperature remains high immediately after the compressor stops Wait for some time after the compressor stops and observe Check for crossed wiring and installation errors
184. unit is heating the unit where defrost is occurring When 1 outdoor unit completes defrost the other outdoor unit performs defrost in the same way Because the amount of time that the unit operates as an evaporator is very short there is little danger of frost forming again quickly Rather because the heat source is very powerful it is possible to shorten the defrost operating time 2 Defrost sequence Outdoor unit cycle defrost is always completed in 2 defrost operations A When there are 2 outdoor units Defrost Evaporator Evaporator Defrost outdoor unit outdoor unit outdoor unit outdoor unit First operation Second operation e Defrost flow E Evaporator operation C Condenser operation S Shut off E gt C Switching from evaporator operation to condenser operation C gt E Switching from condenser operation to evaporator operation Defrost Defrost in Switch Defrost in Defrost preparation progress progress preparation Outdoor unit s where defrost occurs first Outdoor unit s where defrost occurs second Stopped indoor units Indoor units where fan is operating Defrost units judgment units ECH Compressor Stopped With type E1 E gt C occurs for 3 minutes after defrost ends Therefore the thermostat remains OFF for 3 minutes 1 14 3 WAY VRF SYSTEM 4 Special Controls Control Functions 4 3 7 Defrost end judgment conditions Defrost ends when either of the below defrost end judgment conditions is met Condi
185. until the temperature has dropped to or below the start prohibit temperature Discharge temperature protection list Constant speed Stop temp 222 222 Start prohibit temp Alarm display P03 2 Discharge sensor trouble detection control An alarm occurs if the discharge temperature remains abnormally high when the system has been stopped for 60 minutes In this case possible causes include sensor failure and compressor overheating caused by an insufficient level of refrigerant The alarm also occurs if the sensor temperature is at or above the abnormal temperature 176 F when 20 min utes have passed after the compressor stopped In this case it is possible that the discharge temperature from a different outdoor unit is being detected due to an error in the installation of the discharge thermistor Discharge sensor failure list Constant speed Stop temp F04 FEIS 3 WAY VRF SYSTEM 14 Current Protection Control Functions 1 Fan motor Aam Description S Occurs when the fan motor detects overcurrent or when the motor is locked and does not turn 2 Inverter compressor Alarm Description Occurs during ordinary operation when overcurrent 27 A is detected P26 Occurs under the same conditions as P16 when the inverter compressor is operating at or above 80 Hz P29 Occurs when missing phase or overcurrent 48 A is detected at inverter compressor start The alarm at frequencies below 2
186. ure below 1 Connect a tube to the oil outlet port on the outdoor unit to be charged with oil Insert the other end of the tube into the oil container 2 Follow the instructions in 7 Evacuating System and apply vacuum to the outdoor unit to be charged with oil When this is done oil is charged into the outdoor unit through the oil outlet port 3 When the unit has been charged with the designated amount of oil stop the vacuum pump J N exon Because oil absorbs moisture readily this work must be completed quickly 3 WAY VRF SYSTEM 8 Charging Compressor Oil Outdoor Unit Repair Procedures Oil tube service port High pressure outlet port For 1 4 6 35mm dia For 5 16 7 94mm dia connector connector el Oil i Low pressure outlet port For 5 16 7 94mm dia connector EET Manifold gauge Log pHi I i O of Vacuum pump VW sis Fig 2 19 8 3 Charging Additional Compressor Oil after replacing compressor The rated amount of oil is pre charged in the compressors as given below Compressor model Pre charged amount of oil gal U 72MF1U9 C 9RVN273HOU U 72MF1U9E Inverter controlled rotary compressor E C 9RVN273HOU 1 0 50 U 96MF1U9 Inverter controlled rotary compressor U 96MF1U9E JT160G KTTJ 1 0 55 Constant speed scroll compressor When repl
187. uring mixed heating cooling operation It also turns ON in order to recover refrigerant at the outdoor unit after heating operation is stopped This valve is never ON at the same time as the RCV 1 The OFF conditions take priority over the ON conditions for this valve 2 This valve turns ON for 30 50 seconds after the outdoor unit stops and then turns OFF 3 This valve turns ON once after the outdoor unit starts A Heating operation amp This valve turns ON when poor refrigerant flow at an indoor unit is detected and when symptoms of overcharge are detected After the valve turns OFF it will not turn ON again for 15 minutes B Mixed heating cooling operation amp This valve turns ON when poor refrigerant flow at an indoor unit is detected and when symptoms of overcharge are detected if the heat exchanger at the outdoor unit is functioning as an evaporator 4 This valve turns OFF when an abnormal drop in discharge gas temperature is detected 5 This valve turns OFF when a drop in the detected receiver tank temperature continues for a set length of time and when liquid back flow is judged to be occurring t 17 3 WAY VRF SYSTEM 6 Operation of Solenoid Valves Control Functions 6 3 Balance Valve BALV This valve moves some of the oil from the oil separator to the balance tube 1 When unit is stopped This valve is always OFF 2 When unit is operating A This valve is ON when separator oil self
188. utdoor unit However if only one outdoor unit is installed leave the balance tube kept closed 7 Charge the recovered refrigerant with the Refrigerant Recovery Unit by referring to the Installation Instructions that came with the outdoor unit and the refrigerant recovery unit 3 WAY VRF SYSTEM 12 Repl acin g 4 way valve Outdoor Unit Repair Procedures 12 2 When the replacement is not available from the right side of the unit 1 Follow the instructions of 10 Compressor and remove the constant speed compressor 2 Connect the manifold gauge to the high and low pressure outlet ports at the outdoor unit where the 4 way valve will be replaced Connect the manifold gauge to a nitrogen cylinder and perform nitrogen gas replacement 3 Prepare the brazing kit to disconnect the brazed parts 4 locations Nezen Protect the check valves as shown in the figure 2 31 LE G ab T N Ki LI AP N Tat Keres 7 Tie 4 e SS 7 A ki E gt h Gite Y es Se ee ee aN DAN PN HCH Ge Ge d fri Geht p Dec d F i eS MY aw e Ae ENE AN Ve GC t j f lt SA vik 5 i S e e ve D gt EN at ag Je vi E Ln Es TAN ei _ 77 SE EE e e N 4 way valve vif N ta D Brazed parts 4 locations Fig 2 31 4 After replacing the 4 way valve follow the instructions in 10 Compr
189. y Permit prohibit automatic heating cooling 3 WAY VRF SYSTEM 2 Detailed Settings Function Remote Controller Functions hemeose wm beserplin Set when the indoor unit EEPROM memory is replaced during servicing mm Indoor unit capacity System outdoor unit address These are not set at the time of shipping from the factory Indoor unit address These must be set after installation if automatic address setting is not performed Group address Shifts the intake temperature during cooling and dry operation Enabled only when the body thermostat is used Increase this value when it is difficult to turn the thermostat ON Cooling intake temperature shift Automatic stop time after The time at which an indoor unit is automatically stopped after operation starts operation start can be set in increments of 5 minutes Use this setting to change the time for forced operation at installation or Forced thermostat ON time servicing from 5 minutes to 4 minutes Enabled only with Single models Cooling discharge Shifts the set value for models which perform discharge temperature control Discharge temperature control models Floor discharge wall built in direct expansion coil outdoor air treatment high fresh temperature shift Auto heat cool selects the operating mode automatically based on the Temperature shift for difference between the room temperature and the temperature set on the cooling heating change in remote cont
190. y on the wired remote controller CAUTION and system remote controller Blinking inspection display 1 Automatic backup Blinking inspection display Alarm meaning Automatic backup is in progress A C units can be operated Status The compressor at one of the outdoor units where the outdoor unit fan is running should be operating Blinking inspection display also occurs when seizing of the compressor magnet SW is detected Because this may also be the case refer to Blinking inspection display compressor magnet SW seizing detection Alarm conditions When alarm P16 P22 P26 P29 Hx1 Hx2 or H31 has occurred correcting the control device remote controller etc input engages this mode Probable cause Because alarm P16 P22 P26 P29 Hx1 Hx2 or H31 has occurred check the alarm history then refer to the corresponding items Follow the instructions in the corresponding items to correct the trouble Recovery After repairing the malfunctioning locations reset the power for the system all outdoor units Caution Automatic backup mode will not be canceled until the power is reset Notes Automatic backup mode is not engaged in cases of alarms other than those listed above Reasons There is no need for automatic backup if recovery is possible by correcting the remote controller input e With alarms for which automatic recovery is possible such as sensor alarms the presence of electrical noise may result in
191. ybrid IC 8 3 Fixed Initial Fan Mode For the first 30 seconds after operation starts the mode is fixed at the initial mode which was calculated from the relationship between the outdoor air temperature and the outdoor unit horsepower If the outdoor unit horsepower changes dramatically the initial mode may be recalculated and may be again fixed for 30 seconds 8 4 Operation after Fixed Initial Fan Mode After the fixed initial fan mode the fan mode is increased or decreased according to the operating conditions 1 Cooling mode at all indoor units or else mixed heating cooling operation when the outdoor unit is functioning as a condenser A Fan mode is increased when the pressure sensor temperature is high and is decreased when the pressure sensor temperature is low The fan mode is always increased when the pressure sensor temperature is 122 F or higher B The fan mode may be decreased when symptoms of insufficient gas are detected at an indoor unit 2 Heating mode at all indoor units or else mixed heating cooling operation when the outdoor unit is functioning as an evaporator A If the condensation temperature is low the fan mode is increased at regular intervals B If the condensation temperature is high the fan mode is decreased in order to prevent excessive loads C The fan mode may be increased when the outdoor liquid temperature drops to 44 F or below 8 5 Snow Removal Control 1 When the outdoor air tem

Panasonic U-72MF1U9E Service Manual

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