Service Manual
Contents
1. 19 7 Operation CharacteristiCS san 21 8 Electronic ne alanina alama anka ilani lann 22 5 1 1 a 22 9 2 Display T lhctiOn saven eet e Ce y ede Mod aeter pe ee dese ende eee 22 8 3 Main Protection e teamed e eden RR kei 23 8 4 Operation Modes and Functions nnn nennneneer enen eenennneneereneneenennneneereneenennennenneneene eenn 24 9 Troubleshooting nsal 37 9 1 Indoor Unit Error Display semen eee alla eene eere edente ee doner t pn 37 9 2 Diagnosis and 38 1 Precaution 1 1 Safety Precaution WB To prevent injury to the user or other people and property damage the following instructions must be followed B Incorrect operation due to ignoring instruction will cause harm or damage m Before service the unit be sure to read this service manual at first 1 2 Warning Installation m Do not use a defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock m For electrical work contact the dealer seller a qualified electrician or an authorized servi2. TOYOTOMI service Manual Model MTN MTG A371DV CONTENTS 1 Precaution ENR ARE AE M MKE EE MM K EN 1 1 4 SatetyiPrecautiofinsr E 1 1 2 Watnlrg ee etn E FER 1 2 EP 5 6 gal Indoor Unites wanten D 6 3 2 Outdoor UM c ENA 7 4 Refrigerant Cycle Diagram 8 5 Wiring Diagram T 9 LC 9 6 Installation Details ama EATE sn enen a deens ada amaaan 11 6 1 Wrench torque sheet for enne 11 06 2 Connectingtlie cables itii thiet Ed Hep eiie ya 11 6 3 Pipe length and the elevation 12 6 4 Installation for the 13 6 5 Adding the refrigerant after running the system for many years 16 6 6 Re installation while the indoor unit need to be 17 6 7 Re installation while the outdoor unit need to be
3. m Do not place anything on the power cable There is risk of fire or electric shock m Do not plug or unplug the power supply plug during operation There is risk of fire or electric shock m Donot touch operation the product with wet hands Do not place a heater or other appliance near the power cable There is risk of fire and electric shock m Do not allow water to run into electrical parts It may cause fire failure of the product or electric shock m Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product B Do not use the product in a tightly closed space for a long time Oxygen deficiency could occur m When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on Ifstrange sounds or smoke comes from product turn the breaker off or disconnect the power supply cable There is risk of electric shock or fire m Stop operation and close the window in storm or hurricane If possible remove the product from the window before the hurricane arrives There is risk of property damage failure of product or electric shock 2 m Do not open the inlet grill of the product during operation Do not touch the electrostatic filter if the unit is so equipped There is risk of physical injury electric shock or product failure m When the product is soaked contact an authorized service center There is risk of fire or elec
4. The compressor runs at F2 frequency and indoor fan runs as breeze The machine will turn to auto mode as 24 setting temperature after running for 30 minutes Forced auto mode The action of forced auto mode is the same as normal auto mode with 24 setting temperature 8 4 7 Timer function 8 4 7 1 Timing range is 24 hours 8 4 7 2 Timer on The machine will turn on automatically when reaching the setting time 34 8 4 7 3 Timer off The machine will turn off automatically when reaching the setting time 8 4 7 4 Timer on off The machine will turn on automatically when reaching the setting on time and then turn off automatically when reaching the setting off time 8 4 7 5 Timer off on The machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting time 8 4 7 6 The timer function will not change the AC current operation mode Suppose AC is off now it will not start up firstly after setting the timer off function And when reaching the setting time the timer LED will be off and the AC running mode has not been changed 8 4 7 7 The setting time is relative time 8 4 8 Sleep function mode 8 4 8 1 Operation time in sleep mode is 7 hours After 7 hours the AC quits this mode and turns off 8 4 8 2 Operation process in sleep mode is as follow When cooling the setting temperature rises 1 lower than 30 every one hour 2 hours later the setti
5. keeps lower than TCDI 4 more than 3 minutes the machine will enter defrosting mode no matter if T2 drops more than 5 or not Condition of ending defrosting If any one of the following items is satisfied the defrosting will finish and the machine will turn to normal heating mode T3 rises to be higher than TCDE1 T3 keeps to be higher than TCDE2 for 80 seconds The machine has run for 10 minutes in defrosting mode TCDE1 15 C TCDE2 8 for MSX 24HRDN1 QC2GW 31 Defrosting action compressor 4 way valve outdoor fan indoor fan For MTN A371DV compressor 4 way valve outdoor fan indoor fan no longer than 10 Model FD FD1 MTN A371DV 90 100 32 8 4 3 5 Evaporator coil temperature protection T2 gt 2 the compressor running frequency decreases to the lower level and runs for 20s When the frequency decreases to F2 and the T2 is still over TEH2 for 3 minutes the compressor will stop T2 lt 48 or T2 stays 48 TEH2 for 6 minutes the frequency will not be limited by T2 T2 gt 60 the compressor will stop and restart when T2 48 While TEH2 53 8 4 4 Auto mode This mode can be chosen with remote controller and the setting temperature can be changed between 17 30 In auto mode the machine will choose cooling heating or fan only mode according to AT AT T1 Ts Indoor fan will run at auto fan of
6. 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Rated current of appliance Nominal cross sectional area mm The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 11 6 3 Pipe length and the elevation The pipe length and refrigerant amount Pipesize size Standard Max Additional e length Elevation refrigerant u Liquid m B m g m Indoor unit Indoor unit Outdoor unit Caution The capacity test is based on the standard length and the maximum permissive length is based on the system reliability The oil trap should be installed per 5 7 meters 6 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze and block capillary tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or a liquid neutral detergent on the indoor unit
7. N C 5 VY YY M fe way Close Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position Be sure to use a hexagonal wrench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the 3 way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0 3 to 0 5Mpa Disconnect the charge set and tighten the 2 way and 3 way valve s stem nuts Use a torque wrench to tighten the 3 way valves service port cap to a torque of 1 8 kgf m Be sure to check for gas leakage 2 Air purging by the refrigerant Charging cylinder Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the val
8. correct zero crossing signal time interval should be between 6 13ms 8 4 Operation Modes and Functions 8 4 1 Fan mode 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled and no setting temperature is displayed 3 Indoor fan can be set to high med low auto 4 The louver operates same as in cooling mode 5 Auto fan l 27 5 High 27 3 Medium 25 5 25 Y Low 8 4 2 Cooling Mode 8 4 2 1 Compressor running rules 24 The maximum operation frequency of compressor after starting submits to following rule 4 Fmax F4 45 43 40 7 38 30 Fmax F8 28 22 Fmax F6 20 1 Fmax F3 Y If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to the outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below i 4 3 5 3 0 2 5 2 0 1 5 1 0 0 5 0 5 1 0 While Temp zone A B D E F G Frequency F8 F8 F7 F6 F5 F3 1 Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A E Increase the frequency to the higher level until to F8 F Keep the current frequency 25 Decrease the frequency to the lower level until to F1 Run at F1 for 1h if T1 Ts lt 2 the compressor will stop Meanwhile the c
9. remote controller When the unit is turned on press the CLEAN AIR button to activate the function Press it again to stop the function During the time when lonizer is controlled by remote controller lonizer will be turned off automatically if indoor fan stops running due to malfunctions or anti cold wind When indoor fan restarts after malfunctions being eliminated and anti cold wind being released lonizer will be available again 8 4 11 8 C Heating optional In heating operation the preset temperature of the air conditioner can be as lower as 8 C which keeps the room temperature steady at 8 C and prevents household things freezing when the house is unoccupied for a long time in severe cold weather 36 9 Troubleshooting 9 1 Indoor Unit Error Display Display LED STATUS EO EEPROM parameter error E1 Indoor unit and outdoor unit communication protection E2 Zero crossing signal error Indoor fan speed has been out of control 5 Open or short circuit of outdoor temperature sensor or outdoor unit EEPROM parameter error Open or short circuit of room or evaporator coil temperature sensor Outdoor fan speed has been out of control IBM malfunction or IGBT over strong current protection Over voltage or too low voltage protection Temperature protection of compressor top Inverter compressor drive error Note E4 amp P3 Reserved function 37
10. the flare nut of the 3 way valves about 45 counterclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure Then remove the charge hose from the 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve 2 Air purging by refrigerant Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a
11. 9 2 Diagnosis and Solution 9 2 1 EEPROM parameter error diagnosis and solution Shut off the power supply and turn on it 5s later The problem comes out again Is the EEPROM chip plugged in indoor PCB well Correct the connection Replace the main PCB of indoor unit 38 9 2 2 Indoor unit and outdoor unit communication protection error diagnosis and solution Turn off the power supply after 1 minute connect the power supply turn on the unit with remote controller The unit does not work normally Check the wiring between indoor and outdoor No unit Is the connection of L N S and GND good Reconnect and retest Yes Is the LED4 red bright and LED1 yellow blinking on outdoor PCB Replace indoor PCB and repower The unit does not work normally The power supply for outdoor PCB is fail Check the wiring on outdoor PCB f m Replace the outdoor e box comparing with wiring plate Is the connection good No Correct the connection 39 9 2 3 Fan speed has been out of control diagnosis Shut off the power supply and turn on it 5s later The unit does not work normally Disassemble the connection between fan and motor check if the bearing is Turn off the unit rotate the cross fan Does it rotate freely normal If not change the bearing If yes follow the below step Is the fan motor connector and connection good Is the voltage being applied to the fan motor Rep
12. BE HEAT EXCHANGE CONDENSER A A gt 4 GAS SIDE qt vs EK 4 42 3 WAY VALVE REVERSING VALVE Y Heating Model only ACCUMULATOR 4 COOLING COMPRESSOR 4 HEATING 5 Wiring Diagram 5 1 Indoor Unit MTN A371DV WIRING DIAGRAM en INDOOR UNIT yg GG 202033090563 SATTCH BARD CONTROL TOP AIR Ye IN LET LOUVER 9 E YO M WG DAY TERATMAL ererererej E 5 Z ma TQ OUTDOOR UNIT SEST nE SHMECTED MMIIRORSIST IT 30 IE SU OF AB OUTIQOR UT CUREEFT 5 2 Outdoor Unit MTG A371DV HEAT EXCHANGER SENSOR PT OA HEATER HAK f oat rer este been hd nn A 1 1 Lj LH LI OLP TEMP SENSORR ee Z 34 LLL WHITE Sea Sa esi L E V S lt 7 1 d ike YIG zl BROWN GND L K S TOI NOGOR UN T RWRSFAY Ue AX REACTORS R1502 10 6 Installation Details 6 1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque mm inch N cm N cm 06 35 1 4 1500 153kgf cm 1600 163kgf cm 69 52 3 8 2500 255kgf cm 2600 265kgf cm 012 7 1 2 3500 357kgf cm 3600 367kgf cm 016 5 8 4500 459kgf cm 4700 479kgf cm p19 3 4 6500 663kgf cm 6700 683kgf cm 6
13. ce center Do not disassemble or repair the product there is risk of fire or electric shock m Always ground the product There is risk of fire or electric shock m Install the panel and the cover of control box securely There is risk of fire of electric shock m Always install a dedicated circuit and breaker Improper wiring or installation may cause fore or electric shock B Usethe correctly rated breaker of fuse There is risk of fire or electric shock m modify or extend the power cable There is risk of fire or electric shock m Do not install remove or reinstall the unit by yourself customer There is risk of fire electric shock explosion or injury m caution when unpacking and installing the product Sharp edges could cause injury be especially careful of the case edges and the fins on the condenser and evaporator m For installation always contact the dealer or an authorized service center Do not install the product on a defective installation stand m sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury m Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open m Take care to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock
14. connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump 2 3 4 5 6 indoor unit xx Liquid side Outdoor unit xz Two way valve Close Gas side vA j Three way valve Manifold valve Compound meter uiu p Pressure X 20Pa gage flo m Handle Lo 5 Handle Hi Charge hose 7 Charge hose Vacuum pump Vacuum pump Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 valves are set to the closed position Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port Connect the charge hose of handle hi connection to the vacuum pump Fully open the handle Lo of the manifold valve Operate the vacuum pump to evacuate Make evacuation for 30 minutes and check whether the compound meter indicates 0 1 If 13 the meter does not indicate 0 1Mpa after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 7 Turn
15. ct malfunction or inefficient operation 3 gt Operational B Do not expose the skin directly to cool air for long time Do not sit in the draft B Do not use the product for special purposes such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property m Do not block the inlet or outlet of air flow B Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product m Do not touch the metal parts of the product when removing the air filter They are very sharp m Do not step on or put anything on the product outdoor units m Always insert the filter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage B Do not insert hands or other objects through air inlet or outlet while the product is operated B Do not drink the water drained from the product m Use a firm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury m Replace the all batteries in the remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion B Do not recharge or disassemble the batteries Do not dispose of batteries in a f
16. d confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 5 Disconnect the charge hose from the vacuum pump 19 2 Refrigerant charging Indoor unit Liquid side a 7 valve 2 Lea BiG ZEN Gas side X UP UL _ valve valv S Charging cylinder Electronic scale Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure 5 When the electronic scale displays the proper weight disconnect the charge hose from the 3 way valve s service
17. e system for many years P scie iain lt eran Outdoor unit 2 way valve Charging cylinder Electronic scale Procedure 1 Connect the charge hose to the 3 way service port open the 2 way valve and the 3 way valve Connect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 16 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 6 Re installation while the indoor unit need to be repaired 1 Collecting the refrigerant into the outdoor unit Kor md Liquid eet GN Outdoor unit D m e lose
18. ire They may burn of explode m Ifthe liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked 2 Function Model Names of Indoor Outdoor Units DC Capacity Indoor units Outdoor units Inverter 24k MTN A371DV MTG A371DV Filter killer of formaldehyde lonizer O 8 degree heating O Silver Ico Filter O Heat compensation O Vitamin C Filter O 3M HAM Filter O Bio Filter O Golden Fin O Self Clean Follow me Self diag function Hydrophilic aluminum fin Anti rust cabinet Valve protection cover PTC Heating Belt O Compressor Crankcase Heater O O optional function 3 Dimension 3 1 Indoor Unit MTN A371DV 3 2 Outdoor Unit More than 30cm ore than 70cm Ma yip More than 60cm More than 60cm Service space m 4 JE Air T a Air inlet cs Air t 1 A371DV 900 315 860 4 Refrigerant Cycle Diagram INDOOR HEAT EXCHANGE EVAPORATOR OUTDOOR 4 CHECK VALVE LIQUID SIDE Heating Model only 7 4 2 WAY VALVE gt H CAPILIARY TU
19. l every minutes 90 lt 75 lt 105 keep running at the current frequency 15 lt 90 no limit for frequency 8 3 4 Fan Speed is out of control When Indoor Fan Speed keeps too low 300RPM for certain time the unit will stop and the LED will display the failure 8 3 5 Inverter module Protection The Inverter module has a protection function about current voltage and temperature If these protections happen the corresponding code will display on indoor unit and the unit will stop working 23 8 3 6 Indoor fan delayed open function When the unit starts up the louver will be active immediately and the indoor fan will open 10s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 8 3 7 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature lt 3 the machine connects to power supply newly or if T4 lt 3 and compressor has stopped for over 3 hours the compressor heating cable will work Preheating mode A weak current flow through the coil of compressor from the wiring terminal of the compressor then the compressor is heated without operation Preheating release condition If TA 5 orthe compressor starts running the preheating function will stop 8 3 8 Zero crossing detection error protection If AC detects time interval is not correct for continuous 2405 the unit will stop and the LED will display the failure The
20. lace the fan motor No Replace the PCB 9 2 4 Open or short circuit of temperature sensor diagnosis and solution Check the connections between the sensors and the PCB Are the connections good Yes i Yes Replace the sensor and check if Replace the outdoor PCB the errors happen again 40 9 2 5 IGBT over strong current protection diagnosis and solution Check whether the connections between outdoor PCB and IPM are good Yes Check whether the IPM is fixed to radiator Fastening the IPM to the radiator tightly Replace the IPM Replace the compressor 9 2 6 Over voltage or too low voltage protection diagnosis and solution No Is the power supply good Make sure the power supply is normal Yes The unit does not work normally Replace the outdoor e box 9 2 7 High temperature protection of compressor top diagnosis and solution No Is the connection good Reconnect it Does the compressor operate Yes Yes Is refrigerant circulation volume normal Is protector normal Replace it No Charge refrigerant Yes Is the abnormality the same after gas charging Replace the outdoor PCB There is block Such as capillary or welded points of the pipes 41 9 2 8 Inverter compressor drive error diagnosis and solution Is the connection of compressor good Is the wiring sequence right The voltage Reconnect and retry range proper Replace inverte
21. ne for 3 minutes the compressor frequency will rise to the higher level The frequency will increase twice at most 29 8 4 3 2 Outdoor fan running rules 4 Low 17 15 High Y 8 4 3 3 Indoor fan running rules Setting 44 38 37 _ 34 i 33 Breeze 17 If the compressor stops caused by the room temperature rising the indoor fan will be forced to run 127 seconds with breeze During this period the anti cold wind is disabled If the machine runs in rating capacity test mode the indoor fan will run with rating speed and the anti cold wind function is disabled Indoor fan speed can be set as high medium low or auto fan and the anti cold wind function is preferential 30 Auto fan action in heating mode 4 Low 255 2 A Medium 1 5 High Y 8 4 3 4 Defrosting mode Condition of defrosting T4 gt 0 When the units are running if the following two items are satisfied the units start defrosting The units run with T3 lt 3 for 40 minutes and keeps lower than TCDI for more than minutes The units run with T3 lt 3 for 80 minutes and keeps lower than TCDI 2 for more than 3 minutes While TCDI 6 T4 lt 0 If the 1 condition and 2 condition items are satisfied then the program judges if T2 has decreased more than 5 When T2 has decreased more than 5 enter the defrosting mode No matter what value T4 is if the machine runs with T3 3 for more than 120 minutes and T3
22. ng rules The maximum operation frequency of the compressor after starting submits to the following rule 27 4 33 ps 28 gt Fmax F2 27 RN 25 gt Fmax F3 24 N 22 2 Fmax F4 19 18 Fmax F5 1 Fmax F6 16 15 Se 14 12 lt 5 11 EES 6 Fmax F9 us Y Fmax F10 If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below 5 0 4 5 13 5 30 OF 2 0 D B 1 5 0 5 A 28 While Temp zone A B D E F G Frequency F10 F9 F8 F7 F5 F3 F1 0 as default Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A E Increase the frequency to the higher level until to F10 F Keep the current frequency G Decrease the frequency to the lower level until to F1 Run at F1 for 1h if T1 Ts AT gt 6 the compressor will stop Meanwhile the compressor running frequency is limited by the current Al 4 Off Decrease I2HEAT Ne Hold Resume Off Compressor stops Decrease Decrease the running frequency to the lower level Hold Keep the current frequency Resume No limitation for frequency Note When AC is in hold zo
23. ng temperature stops rising and indoor fan is fixed as low speed When heating the setting temperature decreases 1 be higher than 17 every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed Anti cold wind function has the priority 8 4 8 3 Timer setting is available 8 4 8 4 When user uses timer off function in sleep mode or sleep function in timer off mode if the timing is less than 7 hours sleep function will be cancelled when reaching the setting time If the timing is more than 7 hours the machine will not stop until reaches the setting time in sleep mode 8 4 9 Auto Restart function The indoor unit is equipped with auto restart function which is carried out through an auto restart module In case of a sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 setting temp If AC is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 35 8 4 10 lonizer function optional The indoor unit is equipped with lonizer which is controlled by the CLEAN AIR button on the
24. ompressor running frequency is limited by the current Off I3COOL Decrease I2COOL Hold COOL Resume Off Compressor stops Decrease Decrease the running frequency to the lower level Hold Keep the current frequency Resume No limitation for frequency Note When AC is in hold zone for 3 minutes the compressor frequency will rise to the higher level frequency will increase twice at most 8 4 2 2 Outdoor fan running rules High 22 20 Low 8 4 2 3 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be selected as high medium low and auto Auto fan in cooling mode acts as follow 26 High Medium Y Low 8 4 2 4 Condenser temperature protection 55 lt T3 lt 60 the compressor frequency will decrease to the lower level until to F1 and then runs at F1 If T3 lt 54 the compressor will keep running at the current frequency T3 52 the compressor will not limit the frequency and resume to the former frequency T3 gt 60 for 5 seconds the compressor will stop until T3 52 8 4 2 5 Evaporator temperature protection 12 lt 0 the compressor will stop and restart when T2 gt 5 0 CST2 4 the compressor frequency will be limited and decreased to the lower level 4 lt 2 lt 7 the compressor will keep the current frequency 2 gt 7 the compressor frequency will not be limited 8 4 3 Heating Mode 8 4 3 1 Compressor runni
25. port immediately If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 6 Mounted the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 20 7 Operation Characteristics Temperature Cooling operation Heating operation Drying operation Mode Room temperature 217 C lt 30 C gt 10 C 0 C 50 C 15 C 50 C Outdoor temperature 15 C 34 C 0 C 50 C For the models with low temperature cooling system CAUTION 1 If air conditioner is used beyond the above conditions the certain protections may action 2 Room relative humidity should be less than 80 If the air conditioner operates in excess of this value the surface of the air conditioner may attract condensation water In this case please set the vertical air louver to its maximum angle vertically to the floor and set the fan to high speed 21 8 Electronic function 8 1 Abbreviation T1 Indoor room temperature T2 Coil temperature of evaporator T3 Coil temperature of condenser T4 Outdoor ambient temperature T5 Compressor discharge temperature 8 2 Display function 8 2 1 Icon explanation on indoor display board leno Se de SS 1 LI 1 10 0 Signal receptor ON OFF indicator This indica
26. r compressor Replace the outdoor PCB 9 2 9 Zero crossing detection error This is alarm signal when the main chip can t detect over zero signal When such failure occurs the main control board must have fault 42
27. the relevant mode The louver operates same as in relevant mode If the machine switches mode between heating and cooling the compressor will keep stopping for 15 minutes and then choose mode according to T1 Ts If the setting temperature is modified the machine will choose running function again 8 4 5 Drying mode 8 4 5 1 Indoor fan speed is fixed at breeze and can t be changed The louver angle is the same as in cooling mode 8 4 5 2 Compressor running rules 33 2 5 2 0 1 5 F2 1 0 0 5 F1 0 0 F1 1 8 4 5 3 Low indoor room temperature protection In drying mode if room temperature is lower than 10 the compressor will stop and not resume until room temperature exceeds 12 8 4 5 4 Evaporator anti freezing protection condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode 8 4 5 5 The outdoor fan operates the same as in cooling mode 8 4 6 Forced operation function 8 4 6 1 Enter forced operation function When the machine is off pressing the touch button will carry the machine to forced auto mode After this the machine will turn into forced cooling mode if pressing the button once again within 5 seconds In forced auto forced cooling or any other operation mode pressing touch button will turn off the machine 8 4 6 2 In forced operation mode all general protections and remote control are available 8 4 6 3 Operation rules Forced cooling mode
28. tor illuminates when the air conditioner is in operation PRE DEF Indicator For Cooling amp Heating models only This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode c aut Auto Mode uro Turbo indicator This indicator illuminates when the air conditioner is in turbo operation This indicator illuminates when the air conditioner is in Auto Mode 22 A il 4 Lj TEMPERATURE indicator Usually it displays the temperature settings TIMER indicator This indicator illuminates when TIMER is set ON OFF This indicator illuminates when change the fan speed e lonizer Plasma function indicator This indicator illuminates when lonizer Plasma function is on 8 3 Main Protection 8 3 1 Three Minutes Delay at restart for compressor 1 minute delay for the 1 time start up and 3 minutes delay for others 8 3 2 Temperature protection of compressor top The unit will stop working when the compressor top temp protector cut off and will restart after the compressor top temp protector restart 8 3 3 Temperature protection of compressor discharge When the compressor discharge temp is getting higher the running frequency will be limited as below rules Compressor discharge temp T5 gt 115 for 5s compressor stops 108 T5 115 decrease the frequency to the lower leve
29. torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 3 Adding the refrigerant if the pipe length gt 5m Indoor unit YTZ Liquid side Outdoor unit ue E valve uzi d Charging cylinder Electronic scale Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure the liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 15 6 When the electronic scale displays the proper weight refer to the table disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 5 Adding the refrigerant after running th
30. tric shock m caution that water could not enter the product There is risk of fire electric shock or product damage m Ventilate the product from time to time when operating it together with a stove etc There is risk of fire or electric shock m Turn the main power off when cleaning or maintaining the product There is risk of electric shock B When the product is not be used for a long time disconnect the power supply plug or turn off the breaker There is risk of product damage or failure or unintended operation m to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage CAUTION B Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product m Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage B Keep level even when installing the product It can avoid vibration of water leakage m Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors B Use two or more people to lift and transport the product B Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause produ
31. ves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for the whole system pa f Outdoor unit Em a N Wm A ns OPEN CC emg valve s TN cB Vacuum pump Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Low side on the charge set turn off the vacuum pump an
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