technical data & service manual split system air conditioner
Contents
1. Check for right connection of communication wires Check outdoor unit Is there any led on YES Turn off power supply and after 3 minutes turn on again Outdoor unit PCB assy is defective Replace outddor unit PCB 24 YES 100mA Replace fuse NO gt See section 6 5 7 4 OUTDOOR UNIT DOES RUN AND FAULT IS DISPLAYED Turn off power supply and after 3 minutes turn on again Does the external unit run NO YES PUL TOR TOW Minutes Check compressor operation CASE 3 CASE 1 for 3 minutes at least easure resistance o indoor fan motor Is it CASE 2 defective YES Y Compressor Compressor tries to start Compressor hisses every 3 int ttentl doesn t run NO Change fan minutes IREM POV motor Indoor unit assy is Check the defective he fan could be braked by easure the resistance o foreign matter compressor motor Can the fan be turned on windings Is it defective NO Y YES Replace the odii Y YES compressor NO Remove the Y Y foreign Check outdoor fan BUE ME matter motor electrical connection Y Replace the fan motor2. Turn the power OFF at the main power board before opening the unit to check or repair electrical parts and wiring Keep your fingers and clothing away from any moving parts Clean up the site after the work remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced Ventilate the room during the installation or testng the refrigeration system make sure that after the installation no gas leaks are present because this could produce toxic gas and dangerous if in contact with flames or heat sources Table of Contents Page 1 SPECIFICATIONS 4 1 1 Unit specifications 4 1 2 Major Component specifications 5 1 3 Other Component specifications 6 2 DIMENSIONAL DATA 7 3 PERFORMANCE DATA 8 3 1 Air Throw Distance Chart 8 4 ELECTRICAL DATA 9 4 1 Electric Wiring Diagrams 9 5 FUNCTION 10 5 1 System operation control 10 5 2 Cool Mode Operation 11 5 3 Heat Mode Operation 11 5 4 Auto Mode Operation only monosplit 12 5 5 Dry Mode Operation 13 5 6 Fan Mode Operation 13 5 7 Auto Fan Speed 13 5 8 Forced Mode 14 5 9 Protection Operations in indoor unit 14 5 10 Protection Operation outdoor unit 15 5 11 Defrost 16 5 12 Feel Function 16 5 13 Hi Power mode 16 5 14 Night Function 17 5 15 Leds off function 17 5 16 Capacity Test Mode 17 5 17 Diagnostic 18 5 18 Indoor unit
3. 7 5 ONLY OUTDOOR UNIT IS OFF EMI filter check up YES Check fuse on outdoor pin1 2 lower than 0 5 ohm pcb Is the fuse blown pin3 4 lower than 0 5 ohm all other pin combination no continuity NO Y There is a possibility of short circuit Check EMI filter Is it defective NO Check all the electrical parts compressor YES fan motor Y inversion valve coil Y crank case heater Outdoor unit PCB assy Base heater Change EMI filter 15 defective defrost valve coil 25 7 6 FAULT ON OUTDOOR UNIT IN OUTDOOR UNIT THERE IS ONE LED BLINKING AT LEAST For the meanings of the faults see paragraph 5 17 TEMPERATURE FAULT ON THE SENSOR INDOOR DAMAGED is Check sensor connection and measure its resistance Replace the sensor COMMUNICATI ERROR COMPRESSOR FAN OVERCURRENT OVERTEMPERATURE ON PFC FAULT See section 7 3 YES Is the communication fuse blown NO resistance of compressor fan 100mA Replace fuse The fuse may be not fitted rightly in the fuseholder Measure the resistance of motor windings Is inductor Is it it defective NO NO YES YES Y Y Y Y Replace the Replace Replace the Replace compres
4. CLIP COPPER TUBE OR INSULATION METALLIC PART TESTER Fig 3 FROM FAN MOTOR COMPRESSOR AND OTHER PARTS METALLIC m PART PROGE S INSULATION TESTER Fig 4 FUSE LTIMETER CONPRESSOR MOTOR CAPACITOR FAN MOTOR CAPACITOR Fig 7 3 Technibel UNE AVANCE DANS L AIR DU TEMPS 0 8180 590 00 04 2010 R D 28 Reyrieux BP 131 01601 Tr voux CEDEX France T l 04 74 00 92 92 Fax 04 74 00 42 00 R C S Bourg en Bresse B 759 200 728 31
5. Air clean filter Optional Optional Dimensions amp Weight Unit dimensions Height 270 Width 805 Depth 215 211 REF Package dimensions Height 273 Width 855 Depth 322 Weight Net 8 0 Shipping 10 0 Shipping volume 0 075 DATA SUBJECT TO CHANGE WITHOUT NOTICE 1 2 Major Component Specifications Controller PCB SAC DCI IDU Microprocessor 250 V 3 15 Fan amp Fan Motor Type Cross flow Dia and lenght 1 95 1617 Fan motor model Q ty KFV4Q 11H5P S 1 No Of poles rpm 230 V Hi 4 1160 Nominal output 10 Coil resistance Ambient temp 20 C BRN WHT 561 8 VLT WHT 197 4 VLT ORG 63 4 YEL ORG 155 7 YEL PNK 115 9 internal fuse Safety devices Type Operating temp 145 5 Run capacitor Stepping motor 2471 DC 12 V 380 796 Aluminium plate fin Copper tube 1 4 Face area 0 130 DATA SUBJECT TO CHANGE WITHOUT NOTICE 1 3 Other Component Specifications Rating Primary AC 230 V 50 Hz oecondary 13 V GVA Capacity resistance O at 25 C Primary secondary Thermal cut off temp 120 C Thermistor Coil sensor Resistance kQ Thermistor Room sensor Resistance kQ 2 DIMENSIONAL DATA NARROW TUBE 98 35 1 47 icis WIDE TUBE 209552 3 91 cm 4 DRAIN HOSE 18 CENTER OF TUBING HOLE 12 qub 2 Q 1 3 PERFORMANCE DATA 3 1 Air Throw Dista
6. control correspond to the figure and dip switch of remote control as shown in the figure indoor unit PCB indoor unit PCB SW1 SW3 SW1 SW3 1 off 1 off 1 1 on 2 off 2 off 2 off 25 off PCB factory state remote control unit remote control unit dip switch is located on the battery compartment dip switch is located on the battery compartment 1 off 1 2 off 2 off 3 on 3 on 4 on 4 on remote control factory state 6 2 Refrigerant Circuit Check only for multisplit 1 Power ON the system 2 Set the remote controller of the unit A as following unit B must be OFF mode COOLING filter ON set point 32 C 3 Press FAN IFEEL button for at least 5 seconds pointing the remote control unit directly at the air conditioner receiver System starts and runs for 3 minutes After 3 minutes operation in case the setting is right the unit switches to COOL mode and stops set point 32 C the system is ready to operate in case the setting is wrong the STANDBY lamp flashes check the setting of indoor units and the connections of the refrigerant circuits 6 3 Changing the Address of the Air Conditioner In case of more than one air conditioner operating in the same room it may be necessary to assign an address to each unit in order to avoid operation conflicts Address is set acting on the dip switches located on the indoor PCB and on the remote controller The PCB settings must match the corresponding ones on the wir
7. following table DL3 DL4 DLS DL6 DL7 JP 1 JP2 JP3 Je2 J03 JUMPER STATUS OOOO mE wr open G goo HILL JP1 JP3 OAT CDT OCT EXP VALVE in 029 228 HELG models GRF98RBIAA M 14 Seti GRF99R5IAA 2 s GRF128R5IAA GRF129R5IAA GR9FIA50R5IAA 19 5 20 Contacts for building automation 5 20 1 INPUT CONTACT J11 green The status of this input affects system operation according to the following Contact OPEN system does not operate always OFF inputs from wireless remote controller are not processed Contact CLOSED system operates in the normal way according to the inputs coming from wireless remote controller 5 20 2 OUTPUT CONTACT J20 This connector is directly tied to the contact normally open of a power relay which activates every time th following alarm condition occur RAT damaged e ICT damaged Communication error e Fault on outdoor unit In this case when alarm happens on poles 1 and 3 of J20 connector 220 VAC 50Hz are available Max electrical load 1A 240VAC INPUT CONTACT CONNECTOR 411 GREEN STATUS CLOSED OUTPUT CONTACT CONNECTOR J20 RED USED TO SIGNAL AN ALARM CONDITION 20 6 INDOOR UNIT AND REMOTE CONTROL ADDRESS 6 1 Address Switches only for multisplit INDOOR UNIT A INDOOR UNIT B Check that the setting of switches SW1 and SW3 on the pcb Set the switches SW1 and SW3 on the pcb and dip switch of remote
8. jumpers Configuration 19 5 19 Outdoor unit jumpers Configuration 19 5 20 Contacts for building automation 20 6 INDOOR UNIT AND REMOTE CONTROL ADDRESS 21 6 1 Address switches only for multisplit 21 6 2 Refrigerant circuit check only for multisplit 21 6 3 Changing the address 21 7 TROUBLESHOOTING 22 7 1 Check before and after troubleshooting 22 7 2 Circuit Breaker Trips or Fuse Blows 22 7 3 System does not run 23 7 4 Outdoor unit does not run and no fault is displayed 25 7 5 Only outdoor unit is off 25 7 6 Fault on outdoor unit 26 7 7 Air Conditioner operates but abnormalities are observed 27 7 8 Noise problem 29 8 CHECKING ELETRICAL COMPONENTS 30 8 1 Measurement of Insulation Resistance 30 8 2 Checking Continuity of Fuse on PCB Assy 30 8 3 Checking Motor Capacitor 30 1 SPECIFICATIONS 1 1 Unit Specifications 220 240 V 50Hz Voltage rating 230 V 50 Hz Performance Capacity See catalogue with the requested matching Air circulation High m3 h 470 Controls Temperature controls Microprocessor thermostat Control unit Wireless remote control unit Timer ON OFF 24 hours amp Daily program 1 hour OFF Fan speed 3 and Auto Airflow direction Horizontal Manual Vertical Auto Air Filter Washable Anti Mold Power noise level High Med Low 39 36 29 Refrigerant tubing connections Flare type Refrigerant Narrow tube in 6 35 1 4 tube diameter Wide tube in 9 52 3 8 Refrigerant R410A Refrigerant tube kit
9. other settings High Med Low 5 3 Heat Mode Operation The Heating mode operation is similar to the Cooling mode operation The CM FMO and FMI are controlled by the same parameters The FMI will not be turned on until the indoor coil temperature is warm enough to prevent the supply of cold air see COLD DRAFT PREVENTION feature for details The indoor fan can change speed only after it has operated at the same speed for 30 sec if in AUTO and 1 sec for the other settings High Med Low 11 5 4 Auto Mode Operation only monosplit RAT SPT C ON OFF COOLING HEATING COOLING 9 Y In Auto Mode the unit switches automatically between the Auto Cooling and Auto Heating in order tc maintain the room temperature RAT at the prescribed set point SPT The switching between the two modes is according to the above graph and following table COOLING gt HEATING If 3 C lt Dt s 1 C and the compressor is off for more than 1 hour If Dt lt 3 C and compressor is off for more than 3 minutes HEATING gt COOLING If 1 C s Dts 3 C and the compressor is off for more than 1 hour If Dt 2 3 C and compressor is off for more than minutes Dt RAT SPT Refer to the sections 5 1 COOLING MODE and 5 2 HEATING MODE for system operation details 12 5 5 Dry Mode Operation Dry operation remove moisture from indoor air running in cooling mode at a low level without reducing
10. TECHNICAL DATA 35 lechnibel amp SERVICE MANUAL Iie Stuer Dee be ee INDOOR UNIT MPAFIAORSIAA SPLIT SYSTEM AIR CONDITIONER Model No Product Code No MPAFIAORSIAA 38 7104 074 0 8180 590 01 10 2012 IMPORTANT Please read before installation This air conditioning system meets strict safety and operating standards For the installer or service person it is important to install or service the system so that it operates safely and efficiently For safe installation and trouble free operation you must Carefully read this instruction booklet before beginning Follow each installation or repair step exactly as shown Observe all local state and national electrical codes Pay close attention to all warning and caution notices given in this manual The unit must be supplied with a dedicated electrical line 4 BRIE This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death N CAUTION This symbol refers to a hazard or unsafe practice which can result 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 sale service outlet or your certified dealer for additional instructions In case of improper installation The manufacturer shall in no way be responsible for improper installat
11. always active and the signalling is made through the display board LEDS In case of no troubles the LEDS status follows its normal function The detected troubles are showed to the user technician using the 3 leds of the indoor unit receive and the 5 leds on the outdoor pcb For each fault there are different effects upon the operation of the A C NOTES The troubles are showed according to a priority list that is in case of more than one trouble present is always showed at first the one with the highest priority 1 gt 2 gt 3 etc e Sensor damaged means a situation where sensor is short circuited or opened Incase of damaged sensors the system CM FMO FMI etc if in OFF state does not start 4 RAT probe damaged System does not operate To restart the system 8 ICT probe damaged o power re setting off on is required The A C switches off As soon as fault is 1 djautonoutdorunt clearedthe system automatically restart Ult wrong mode selected F system does not operate To restart the system select correct mode O LED off F LED blinking e LED on 18 5 18 Indoor Unit Jumpers Configuration Unit is shipped with jumpers set according to the following table JP1 JP2 SO Il 1 JUMPER STATUS JP1 open JP open JP2 open JP2 5 19 Outdoor Unit Jumpers Configuration JUMPERS Unit is shipped with jumpers set RCRUM according to the
12. ced in order to avoid heat exchanger overheating System stops compressor operation when OCT reaches 60 C 5 10 2 Compressor discharge temperature During operation as soon as the discharge temperature increases CDT compressor speed is reduced in order to avoid overheating of the motor Compressor is stopped when CDT reaches 110 C 5 10 3 Compressor power module overheating The module temperature detected by a built in thermistor is always monitored by the control system and kept operating in a safe area If temperature exceeds 100 C operation is automatically stopped 5 10 4 Outdoor fan power module overheating The module temperature detected by a built in thermistor is always monitored by the control system and kept operating in a safe area If temperature exceeds 100 C operation is automatically stopped 5 10 5 Compressor power module overcurrent Operation is automatically stopped in case of current driven to each motor phase greater than a value depending on the power of the outdoor unit for 12000btu 11 for 18000btu 5 10 6 Outdoor fan power module overcurrent In case of current driven to each motor phase greater than 300mA operation is automatically stopped 15 5 11 Defrost The defrost process is controlled by a detection algorithm designed in order to mantain optimal utilization of the heat pump capacity especially during negative outdoor temperature conditions 5 11 1 Defrost standard units SH Compressor
13. e pcb 15 the fuse blown YES Y There is a possibility of short circuit YES Y Measure resistance of fan motor winding NO The receiver assy IS disconnected or defective 2 IN INDOOR UNIT THERE IS ONE LED ON AT LEAST AND THE UNIT RECEIVES THE REMOTE CONTROL SIGNAL mode see par 5 9 e 5 10 Is the set point temperature appropriate YES Is the unit in protection NO y NO Reduce the set point temperature in D cooling mode or increase the set point in heating mode Check outdoor unit leds signaling see par 5 17 CASE 1 Normal leds configuration Y see section 6 4 YES Wait some minutes to restore normal condition CASE 2 There is a fault signaling see section 6 6 23 7 3 SYSTEM DOES NOT RUN 3 IN INDOOR UNIT THERE IS ONE LED BLINKING AT LEAST For the meanings of the faults see paragraph 5 17 TEMPERATURE FAULT ON THE COMMUNICATION SENSOR DAMAGED OUTDOOR UNIT ERROR Is the Y Y communication fuse blown Check sensor connection and See section 7 6 measure its resistance NO The fuse may be not fitted rightly in the fuseholder Replace the sensor
14. e air conditioner can cut your fingers When installing ceiling or wall Make sure the ceiling wall is strong enough to hold the unit weight It may be necessary to build a strong wooden or metal frame to provide added support In a room Properly insulate any tubing run inside a room to prevent sweating which can cause dripping and water damage to walls and floors In moist or uneven locations Use a raised concrete base to provide a solid level foundation for the outdoor unit This prevents damage and abnormal vibrations In area with strong winds Securely anchor the outdoor unit down with bolts and a metal frame Provide a suitable air baffle snowy area for heat pump type systems Install the outdoor unit on a raised platform that is higher than drifting snow Provide snow vents When connecting refrigerant tubing Keep all tubing runs as short as possible Use the flare method for connecting tubing Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them screw by hand and then tighten the nut with a torque wrench for a leak free connection Check carefully for leaks before starting the test run NOTE Depending on the system type liquid and gas lines may be either narrow or wide Therefore to avoid confusion the refrigerant tubing for your particular model is specified as narrow tube for liquid wide tube for gas When servicing
15. een an OFF and a ON operation is not lower than 3 minutes The minimum operating time is not lower than minutes The maximum acceleration deceleration rate is fixed at 20rpm sec During the start up compressor speed increases according to a defined rule which is independent from the thermal load calculation 5 1 2 Multisplit available modes If the unit is a part of a multisplit system there could be some mode combination not available example unit A heat mode and unit B cool mode In this case the system automatically stops leds TMR and STB blink whilst led OPR is on LED blinking e LED on AVAILABLE MODE COMBINATION TABLE INDOOR UNIT A HEAT DRY COOL em Z or B AVAILABLE 1 NOT AVAILABLE 10 5 2 Cool Mode Operation In Cooling Mode the operation of the compressor CM Outdoor Fan FMO and Indoor Fan FMI are determined by 1 the difference between the room air temperature RAT and the set point temperature SPT 2 the protection level at which the system is operating 3 the thermal load in the room NOTES In addition to the temperature difference of above the operation of the main components CM FMO FMI is also controlled by protection function The minimum off time of compressor is 3 minutes The indoor fan can change speed only after it has operated at the same speed for 30 sec if in AUTO and 1 sec for the
16. eless remote controller How to change address of the air conditioner Set the PCB and the remote control to the address desidered ON EL UNIT ADDESS SW3 PCB DIP SWITCH REMOCON 1 2 2 3 unit unit B available available For monosplit all combinations are available 21 7 TROUBLESHOOTING 7 1 CHECK BEFORE AND AFTER TROUBLESHOOTING A Check power supply wiring e Check the power supply wires are correctly connected B Check power supply Check that voltage is in specified range 10 of the rating Check that power is being supplied WARNING If the following troubleshooting must be done with power supplied be careful not to touch any uninsulated live part that can cause electric shock 7 2 CIRCUIT BREAKER TRIPS OR FUSE BLOWS When circuit breaker is set to ON it trips in a few moments Resetting is not possible Measure insulation resistance There is a possibility of ground fault If resistance value is 1 Mohm or less insulation is defective 22 7 3 SYSTEM DOES NOT RUN 1 THERE IS NO SIGNALING LED ON INDOOR UNIT Check power supply Is power being supplied to wall receptacle Circuit breaker is tripped Y Reset the breaker Power failure Y Wait for recovery or contact power company YES Check fuse on indoor The peb assy is defectiv
17. ion or maintenance service including failure to follow the instructions in this document SPECIAL PRECAUTIONS During installation connect before the refrigerant system and then the wiring one proceed in the reverse orden when removing the units BEGUN when wiring ELECTRICAL SHOCK CAN CAUSE SEVERE AN PERSONAL INJURY OR DEATH ONLY A QUALIFIED EXPERIENCED ELECTRICIANS SHOULD ATTEMPT TO WIRE THIS SYSTEM Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked to ensure the grounding Highly dangerous electrical voltages are used in this system Carefully refer to the wiring diagram and these instructions when wiring Improper connections and inadequate grounding can cause accidental injury and death Ground the unit following local electrical codes The Yellow Green wire cannot be used for any connection different from the ground connection Connect all wiring tightly Loose wiring may cause overheating at connection points and a possible fire hazard Do not allow wiring to touch the refrigerant tubing compressor or any moving parts of the fan Do not use multi core cable when wiring the power supply and control lines Use separate cables for each type of line 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 aluminium fins on th
18. nce Chart Room air temp 27 Fan speed High Horizontal distance m Axis air verocity m s Vertical distance m Flap angle 02 Axis air velocity 02 Flap angle 30 Axis air velocity 30 Room airtemp 20 C Fan speed High Horizontal distance m Axis air verocity m s Vertical distance m Flap angle 45 Axis air velocity 45 angle 60 Axis air velocity 60 4 ELECTRICAL DATA 4 1 Electric Wiring Diagrams LINA 4009110 3NIT INT 1041400 J gt I 0 G T BLK RED G77 2 225 Gsm e E Lene X18 71091 Nag AUD LTA 940 ISA IND ASSY GRN YEL I en 5 FUNCTION 5 1 System operation control The inputs to the systems come from indoor and outdoor sensors The outdoor unit is the system MASTER while the indoor one is the SLAVE Communication between units is made with a 2 poles RS485 bus The indoor units receives the user input fan speed flap position etc through remote controller which sends signal every time a button is pressed and in any case automatically every 5 minutes 5 1 1 control specification During operation compressor speed can be subjected to change due to thermal load variations or protection activations but in any case The minimum time interval betw
19. operates for 15 minutes at the maximum power After 15 minutes from the selection the mode is automatically switched off 16 5 14 NIGHT Function When this setting is active indoor fan speed is automatically reduced in order to allow low noise operation Temperature control acts the same way as NORMAL MODE but after 60 minutes of operation the air conditioner modifies automatically the set point temperature according to the following COOLING DRY 1 C HEATING 2 C 5 15 LED OFF function This is a special function mode which can be selected by the user pressing at the same for more than 5 seconds the IFEEL and FAN buttons on the remote controller With this option active the OPERATION TIMER and STANDBY lamps are switched off even during operation they activates only in case of diagnostic signaling 5 16 Capacity Test mode This is a special operating mode used when testing the performance of the A C In this case the main components of the A C compressor outdoor fan indoor fan operate at fixed settings This option is activated shorting the JP1 and JP3 jumpers on the outdoor pcb and setting the remote controller according to the following COOLING MODE Setpoint 10 C I FEEL OFF HEATING MODE Setpoint 32 C I FEEL OFF JUMPERS SETTINGS o JP 1 2 17 5 17 Diagnostic With this feature is possible to have a visual signal that a trouble is occurring This mode is
20. selected pressing the button in a cyclic way OFF gt COOL gt HEAT gt OFF The settings are COOLING mode SET POINT temperature 25 C FAN SPEED HIGH FLAP POSITION 3 HEATING mode SET POINT temperature 21 FAN SPEED HIGH FLAP POSITION 2 4 5 9 Protection operations indoor unit 5 9 1 Freeze up This protection prevents ice formation on the indoor coil heat exchanger The protection is activated as soon as the indoor coil temperature ICT decreases and acts by decreasing the compresor speed The system exit this protection routine when ICT temperature rises above 5 5 9 2 Cold draft This feature prevents the supply of cold air forcing the indoor fan to a speed which cannot be changed rip ee goes down 32 in descending or does not reach 37 C in rising the speed fan is set as shown below Protection level Remote controller set EMEN pese 0 LOW ISERE passei i LLOW 2 5 z E 5 9 3 Overheat This feature prevents the build up of high pressure in the indoor heat exchanger during heating operatior As soon as the indoor coil temperature ICT increases compressor speed is reduced in order to avoid heat exchanger overheating System stops compressor operation when ICT reaches 60 C 14 5 10 Protection operations on outdoor unit 5 10 1 Overheating During cooling operation as soon as the outdoor coil temperature OCT increases compressor speed is redu
21. sor outdoor unit pene outdoor unit fan PCB PCB Check for right connection of communication wires Turn off power supply and after 3 minutes turn on again 26 7 7 AIR CONDITIONER OPERATES BUT ABNORMALITIES ARE OBSERVED 1 POOR COOLING OR HEATING Check the remote Try with PEE P PCB assy Does the indoor unit controller settings another receive the signal NO address remote assy May De i may De defective defective Chapter 6 controller YES Is the remote controller Change the YES position of the remote controller directly under the airflow of the unit NO Set fan speed in YES medium or high speed s the fan motor set in low speed NO Check the air filters Are they clogged YES gt Clean the air filters NO Check the expansion valve coil Is it rightl There is the l gy YES possibilty of gas connected and the i shortage resistance value correct NO Y Replace the expansion valve coil 27 7 7 AIR CONDITIONER OPERATES BUT ABNORMALITIES ARE OBSERVED 2 OPERATION DOES NOT SWITCH FROM HEAT TO COOL AND FROM COOL TO HEAT Remote controller Receiver assy Check the connection Check resistance of unit may be defective may be defec
22. speed fixed Expansion valve opening fixed Outdoor fan switched off Indoor fan controlled by cold draft prevention Reversing valve switched off cooling operation 5 11 2 Defrost Nordic type units SHN and DUAL Compressor speed fixed Expansion valve opening fixed Outdoor fan switched off Indoor fan controlled by cold draft prevention Defrost valve switched on open Reversing valve switched on heating operation For both methods Minimum defrost time interval is 2 minutes e During HIGH POWER operation the defrost detection is ignored until this mode remains active e System exits defrost protection as soon as 14 C the outdoor coil are detected in any case if at least 12 minutes are elapsed from the start of the defrost cycle 5 12 FEEL function As standard configuration the air conditioner operates detecting the room temperature through the sensor equipped in the wireless remote controller icon FEEL shown on the display This feature provides a personalised environment since the temperature can be detected where the remote controller is located It is possible to de activate this option pressing the FEEL button on the remote controller In this case the FEEL icon is no longer displayed and room temperature is detected through the sensor included in the indoor unit 5 13 HI POWER mode When this mode is active the internal fan speed is set automatically and the air conditioner
23. the ambient temperature This is done cycling ON and OFF indoor and outdoor units according to below ROOM TEMP gt SPT 2 C LEVEL 0 Operation according to COOLING mode CM on at constant speed SPT 2 C FMO on at constant speed gt SPT 1 C FMI switches between L and LL every 30 seconds RV off CM switches 9 minutes off and 3 minutes on FMO switches 9 minutes off and 3 minutes ON FMI switches between L and LL every 30 seconds RV off CM off FMO off FMI off RV off SPT Set Point Temperature 5 6 Fan Mode Operation With this mode the indoor fan is turned on while CM FMO and RV stay off all the time The user can select between 3 speeds HIGH MEDIUM and LOW 5 7 Auto Fan speed With this option selected the indoor fan speed changes automatically according to the compressor speed as shown in the following graphs a COOLING 4 fan motor fan motor Aci speed speed BBC HIGH MED MED LOW LOW LLOW LLOW gt low high Rom low high Rpm compressor compressor to prevent the supply of cool air the FMI speed is setted as shown only if the indoor coil temperature ICT 2 32 C see COLD DRAFT PREVENTION feature for details 13 5 8 In this mode the system operates COOLING or HEATING mode fixed settings or is switched off by means of the MODE button on the indoor unit control board The operation modes can be
24. the resistance between the earthed wire and the other power wires fig 1 b Unit Clamp an alluminium plate fin or copper tube with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on N terminal and then on Lterminal the terminal plate fig 2 c Measurement of Insulation Resistance for Electrical Parts Disconnect the lead wires of the disired electric part from terminal plate PCB assy capacitor etc Similary disconnect the connector Then measure the insulation resistance fig 1 to 4 Refer to electric wiring diagram NOTE If the probe cannot enter the poles because the hole is too narrow then use a probe with a thinner pin 8 2 Checking Continuity of fuse on PCB assy Remove PCB assy from electrical component box fig 5 FUSE Then pull out the fuse from PCB assy Check continuity of fuse by the multimeter fig 6 PCB ASS Y 8 3 Checking Motor Capacitor Remove the lead wires from the capacitor terminals and then place a probe on the capacitor terminals as shown in fig 7 Observe the deflection of the pointer setting the resistance measuring range of the multimeter to the maximum value The capacitor is good if the pointer bounces to a great extent and the gradually returns to its original position The range of deflection and deflection time deffer according to capacity of the capacitor 30 EATHER LINE PROBE COPPER TUBE METALLIC PART Fig 2
25. tive of reversing valve coil reversing valve coil 3 CHECK MODE BUTTON OPERATION ON THE UNIT Push the mode button The unit does not run D assy is defective 4 CHECK REMOTE CONTROLLER UNIT The first remote controller is YES J defective or wrong address is set Try to operate with another remote controller Does the unit run NO Check the IR receiver on the indoor unit Is it dirty Clean the IR transmitter of the remote controller NO Check the IR transmitter of the remote controller Is it dirty Clean the IR receiver of the indoor unit 28 7 8 NOISE PROBLEM OUTDOOR UNIT TOO NOISY Check that all the pannel are fixed Check the position of cushion rubbers under the compressor Check that internal tubes are not touching each other or with other components 29 Add dampers under the unit 8 CHECKING ELETRICAL COMPONENTS 8 1 Measurement of Insulation Resistance The insulation is in good condition if the resistance exceeds 1 Mohm a Power Supply Wires Clamp the earthed wire of the power supply wires with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the power wires fig 1 Then measure
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