Midea Advantage Series Service Manual
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Midea Advantage Series Service Manual

Midea Advantage Series Service Manual

Multi zone outdoor condensing units
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CONDENSING UNITS
Revision E:
Model Numbers:
M2OF-18HFN1-M
M5OF-48HFN1-M

Table of Contents

1.
2.
3.
4.
5.
6.
7.
Trouble Shooting
8.
WARNING
Installation MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service
technician familiar with safety procedures and equipped with the proper tools and
test instruments
Installation or repairs made by unqualified persons can result in hazards to you
and others.
Failure to carefully read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or death.
Multi outdoor units
SERVICE MANUAL
ODMFI-E-1712
M3OF-27HFN1-M M4OF-36HFN1-M
1
Multi zone

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  • Page 1 Multi outdoor units Multi zone SERVICE MANUAL CONDENSING UNITS Revision E: ODMFI-E-1712 Model Numbers: M2OF-18HFN1-M M3OF-27HFN1-M M4OF-36HFN1-M M5OF-48HFN1-M Table of Contents Indoor Unit Combination Dimension Of Outdoor Unit Refrigerant Cycle Diagram Installation Details Electronic Function Wiring Diagrams Trouble Shooting Disassembly Instructions WARNING ...
  • Page 2 CONTENTS Indoor Unit Combination ............................4 Dimension Of Outdoor Unit............................6 Refrigerant Cycle Diagram ............................8 Installation Details ..............................11 4.1 Wrench torque sheet for installation ....................... 11 4.2 Connecting the cables ............................11 4.3 Pipe length and the elevation ........................... 11 4.4 First-Time Installation ............................
  • Page 3  M4OF-36HFN1-M (WD30 metal plate) ....................115  M5OF-48HFN1-M (WE30 metal plate) ....................122...
  • Page 4 Indoor Unit Combination Multi DC Nominal Suggested Limit Outdoor Unit capacity Combination Multi DC Nominal Suggested 9+18 Limit Outdoor Unit capacity Combination 12+12 12+18 18+18 1drive 2 5.2kW None 9+12 9+9+9 12+12 9+9+12 9+9+18 Multi DC Nominal Suggested Limit 9+12+12 Outdoor Unit capacity Combination...
  • Page 5 18+18+24 9+9+9+9 9+9+9+12 9+9+9+18 9+9+9+24 9+9+12+12 9+9+12+18 9+9+12+24 9+9+18+18 9+9+18+24 9+12+12+12 9+12+12+18 9+12+12+24 9+12+18+18 9+18+18+18 12+12+12+12 12+12+12+18 12+12+12+24 12+12+18+18 9+9+9+9+9 9+9+9+9+12 9+9+9+9+18 9+9+9+9+24 9+9+9+12+12 9+9+9+12+18 9+9+9+18+18 9+9+12+12+12 9+9+12+12+18 9+12+12+12+12 9+12+12+12+18 12+12+12+12+12...
  • Page 6 Dimension Of Outdoor Unit Model Unit： M2OF-18HFN1-M 33.3 14.3 27.6 36.0 21.3 13.8 inch 1034 M3OF-27HFN1-M inch 37.2 16.5 31.9 40.6 26.5 15.9 1034 M4OF-36HFN1-M inch 37.2 16.5 31.9 40.6 26.5 15.9...
  • Page 7 Model Unit： 1333 1060 37.5 16.3 52.5 41.7 25.0 15.9 M5OF-48HFN1-M inch...
  • Page 8 Refrigerant Cycle Diagram 3.1 Refrigeration circuit drawing of inverter 1 drive 2 type I N D O O R O U T D O O R E X V A C A P I L L A R Y A L I Q U I D V A L V E A C H E C K V A L V E E X V B C A P I L L A R Y B...
  • Page 9 3.3 Refrigeration circuit drawing of inverter 1 drive 4 type I N D O O R O U T D O O R E X V A C A P IL L A R Y A L IQ U I D V A L V E A E X V B C A P IL L A R Y B L IQ U I D V A L V E B C H E C K V A L V E...
  • Page 11 ● Refrigerant pipe diameter different Installation Details according to indoor unit to be connected. When using the extension pipe, refer to the 4.1 Wrench torque sheet for installation tables below. ● When refrigerant pipe diameter is different Outside diameter Torque Additional tightening torque from that of the outdoor unit connector (18K inch...
  • Page 12 Procedure: 1) Connect the charge hose to the charging cylinder and open the 2-way and 3-way valves. With the charge hose you disconnected from the 1. Completely tighten the flare nuts on the vacuum pump, connect it to the valve at the indoor and outdoor units.
  • Page 13 4.5 Adding Refrigerant after Long-Term System Operation Procedure Procedure 1). Confirm that both the 2-way and 3-way valves are set to the opened position 1) Connect the charge hose to the 3-way service Remove the valve stem caps and confirm that the port and open the 2-way and 3-way valve.
  • Page 14 valve. 4.7 Evacuation after servicing the outdoor unit refrigeration circuit 1. Evacuation of the complete refrigeration circuit, Indoor and outdoor unit. 1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way valves are set to the closed position.
  • Page 15 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).
  • Page 16 ---- If outdoor fan speed is lower than 100RPM 5. Electronic Function higher than 2400RPM for 60 seconds or more, the unit stops and LED displays failure code. 5.1 Abbreviation 5.3.4 Inverter Module Protection. T1: Indoor ambient temperature ---- The inverter protection module ensures that faults related to current, voltage, or temperature T2: Middle indoor heat exchanger coil does not damage the inverter.
  • Page 17 HeatReturnI The difference between current limit CoolT4Zone5I ℃ and shutdown current HeatT4Zone4I T4≥15℃ Heating current limit value HeatT4Zone3I 14＞T4≥10℃ Heating current limit value HeatT4Zone2I 9＞T4≥6℃ Heating current limit CoolT4Zone4I value HeatT4Zone1I 5＞T4 Heating current limit value HeatStopI Heating stop protection current value CoolT4Zone3I 5.3.7 Indoor / Outdoor Units Communication...
  • Page 18 If the outdoor ambient temperature is higher than The maximum running frequency is adjusted the set frequency during oil return, the unit stops according to the outdoor ambient temperature the oil return process. ℃ Fmax= T4FREMAXC0 5.3.11 Low Outdoor Ambient Temperature 51.5 Protection 50.5...
  • Page 19 Note:Average value of T2：Sum T2 value of all indoor units)/ (indoor units number ℃ ℃ T2 average Standby Decrease frequency Fmax=T4FREHEATMAX1 Fmax=T4FREHEATMAX2 Keep frequency Fmax=T4FREHEATMAX3 Increase frequency Fmax=T4FREHEATMAX4 Fmax=T4FREHEATMAX5 Fmax=T4FREHEATMAX6 Use the following table and final capacity Fmax=T4FREHEATMAX7 request to confirm the operating frequency. Frequency (Hz) HEAT HEAT...
  • Page 20 4) If the compressor cumulative running time O u t d o o r t e m p e r a t u r e ℃ reaches 120 minutes and T3<-15℃. S u p p e r h i g h f a n s p e e d Defrost Stop Conditions H i g h f a n s p e e d If any one of the following conditions is satisfied,...
  • Page 21 open. It opens to the target angle after the compressor starts. 3. The action priority for the EXVs is A-B-C-D-E. I n c r e a s e f a n s p e e d i n c r e a s e L o w C o o l T 3 _ O N 4.
  • Page 22 5.4.5 Four-Way Valve Control In heating mode, a four-way valve is opened. In defrosting, a four-way valve operates according to the current defrosting action. In other modes, a four-way valve is closed. When the unit is switched from heating to other modes, the four-way valve turns off after the compressor has been off for 2 consecutive minutes.
  • Page 23 Wiring Diagrams 6.1 Wiring diagram of 1 drive 2 outdoor M2OF-18HFN1-M...
  • Page 24 6.2 Wiring diagram of 1 drive 3 outdoor M3OF-27HFN1-M...
  • Page 25 6.3 Wiring diagram of 1 drive 4 outdoor M4OF-36HFN1-M...
  • Page 26 6.4 Wiring diagram of M5OF-48HFN1-M PCB board of M2OF-18HFN1-M, M3OF-27HFN1-M L E D 1 s t a t u s l i g h t , b y w h i c h y o u c a n j u d g e t h e u n i t N o r m a l o r E r r o r ( s t a n d b y ) F l a s h i n g o n c e p e r s e c o n d ( l o w s p e e d f l a s h i n g ) ( e r r o r ) F l a s h i n g o n c e p e r h a l f s e c o n d ( h i g h s p e e d f l a s h i n g ) ( r u n n i n g ) a w a y s o n...
  • Page 27 IPM board of M2OF-18HFN1-M, M3OF-27HFN1-M C N 4 ( L ) - C N 5 ( N ) p o w e r s u p p l y c o n n e c t t o t h e m a i n b o a r d n o u s e f u s e 1 T / 3 .
  • Page 28 IPM board of M4OF-36HFN1-M c o n n e c t t o D C f a n m o t o r T O M A I N 0 V A C ( s t a n d b y ) C N 1 9 C N 5 5 1 0 - 2 0 0 V A C...
  • Page 29 IPM board of M5OF-48HFN1-M...
  • Page 30 Troubleshooting 7.1Safety Electricity is stored in capacitors, even when the power supply is shut off. Do not forget to discharge the electricity in the capacitors. The value of resistance is about 1500 ohm to 2000 ohm Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Bulb (25-40W) The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V...
  • Page 31 7.2 Indoor Unit Error Display For Old Console series MFAU-12HRFN1-M, MFAU-12HRFN1-M(B); Operation Timer De-frost Failure ★ Indoor room temperature sensor (T1 ) malfunction ★ Evaporator coil temperature sensor (T2) malfunction ★ Communication malfunction between indoor and outdoor units  ★ Low ambient temperature cut off in heating ★...
  • Page 32 —— ★ ★ Indoor unit EEPROM parameter error  ★ Inverter module (IPM) malfunction Outdoor temperature sensor(coil sensor T3 or ambient temperature ★  E0,E4 sensor T4) malfunction or Outdoor unit EEPROM parameter error  ★ ★ Outdoor fan speed malfunction ——...
  • Page 33 CS11M-09HRFN1-MX0W(A), CS11M-12HRFN1-MU5W, CS11M-18HRFN1-MT0W, CS11M-23HRFN1- MT0W; MS11M-09HRFN1-MW0W, MS11M-12HRFN1-MV0W, MS11M-09HRFN1-MX4W, MS11M- 12HRFN1-MW0W, MS11M-18HRFN1-MU0W, MS11M-24HRDN1-MT0W; 2) Aurora: MSABB-09HRFN1-MT0W, MSABB-12HRFN1-MT0W, MSABE-18HRFN1-MT0W, MSABE-24HRFN1- MT0W; 3) All Easy: MSAEB-09HRFN1-MT0W, MSAEB-12HRFN1-MT0W, MSAED-18HRFN1-MT0W, MSAED-23HRFN1- MT0W; 4) Vertu Plus: MSVPB-09HRFN1-MW0W, MSVPC-12HRFN1-MU0W, MSVPD-18HRFN1-MT0W, MSVPD-22HRFN1- MT0W; 5) Mission: MSMBB-09HRFN1-MW0W, MSMBB-12HRFN1-MU0W, MSMBD-18HRFN1-MT0W, MSMBD- 23HRFN1-MT0W;...
  • Page 34 ——  ★ 1 times Current overload protection ★ 2 times  Outdoor ambient temperature sensor (T4 ) malfunction ★ 3 times  Condenser coil temperature sensor (T3) malfunction ★ 4 times  Compressor discharge temperature sensor (T5) malfunction ★ 5 times ...
  • Page 35 Display Remark Number Presses Normal display Displays running frequency, running state, or malfunction code Quantity of indoor units with working connection Actual data Display Number of indoor unit Outdoor unit running mode code Off: 0,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost:A Indoor unit A capacity Indoor unit B capacity...
  • Page 36 The frequency after the frequency limit The frequency sending to compressor control chip Indoor unit A evaporator outlet temperature (T Indoor unit B evaporator outlet temperature (T ℃ , the digital display shows “-9.” If the If the temperature is lower than -9 Indoor unit C evaporator outlet temperature ℃...
  • Page 37 F indoor unit room temperature (T F indoor unit evaporator temperature (T EXV open angle for F indoor unit 7.3.2 Outdoor Unit Digital Display A digital display is featured on the outdoor PCB. The LED displays different codes in the following situations: ...
  • Page 38 7.3.3 Outdoor unit error display Display LED STATUS New indoor Error Outdoor unit EEPROM parameter error Communication malfunction between indoor and outdoor units —— Communication malfunction between IPM board and outdoor main control board Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor F2/F1/F3/F6 discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction Over-voltage or under-voltage protection...
  • Page 39 7.4 Diagnosis and Solution 7.4.1 Indoor unit trouble shooting 7.4.1.1 Indoor unit EEPROM parameter error diagnosis and solution. Malfunction conditions Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Potential causes Installation mistake ● Faulty PCB ●...
  • Page 40 7.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and solution. Malfunction conditions If indoor unit does not receive the feedback from outdoor unit during 120 seconds. ● Wiring mistake Potential causes ● Faulty indoor or outdoor PCB Trouble shooting:...
  • Page 41 Indoor / outdoor units communication error Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 42 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and S port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for S port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 43 Pic 2: IPM (for 2 zone/ 3-zone) Operating Standby els)
  • Page 44 Pic 2: IPM (for5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 45 PIC 4: Check point button, press 1 time for check how many indoor units are connected. 7.4.1.3 Zero-crossing signal detection error diagnosis and solution. Malfunction conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. ●...
  • Page 46 7.4.1.4 Indoor fan speed malfunction diagnosis and solution. Malfunction conditions When indoor fan speed is too low (300RPM) for a certain period of time, the unit ceases operation and the LED displays a failure code. Potential causes Wiring mistake ● Faulty fan assembly ●...
  • Page 47 Index 1: 1: Indoor AC fan motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V (208~240V power supply)or 50V(115V power supply), the PCB must have problems and need to be replaced.
  • Page 48 7.4.1.5 Temperature sensor malfunction diagnosis and solution. Malfunction conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure. Wiring mistake Potential causes ● Faulty sensor ● Faulty PCB ● Trouble shooting: Check the connections between temperature Correct the connections.
  • Page 49 7.4.1.6 Inverter module (IPM) malfunction diagnosis and solution. Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P6” and AC will turn off. ● Wiring mistake Potential causes ● IPM malfunction ●...
  • Page 50 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36K-48KBtu/h Check whether the connecting line between main board and...
  • Page 51 7.4.1.7 Over-voltage or under-voltage protection diagnosis and solution. Voltage protection Check the voltage of outdoor unit power supply, whether the voltage Check the power supply between L(L1) and N (L2) is about 187~253VAC Check whether the voltage of IPM board P and N is normal? DC277-356V for 18-27KBtu/h;...
  • Page 52 7.4.1.8 Compressor drive malfunction diagnosis and solution The trouble shooting is same with one of IPM module protection. Water-level alarm malfunction 7.4.1.9 diagnosis and solution Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure code. Potential causes ●...
  • Page 53 7.4.1.10 Indoor units mode conflict Error Code P5(old model) or - -(new model) Malfunction conditions The indoor units cannot work cooling mode and heating at same time. Heating mode has a priority. ● Suppose Indoor unit A working in cooling mode or fan mode, and Potential causes indoor unit B is set to heating mode, then A will change to off and B will work in heating mode.
  • Page 54 7.4.1.11 High temperature protection of IPM board diagnosis and solution High temperature protection of IPM High temperature protection of IPM board board Check whether the radiator is Check whether the radiator is Fix the radiator well Fix the radiator well fixed well ? fixed well ? Check whether electronic...
  • Page 55 7.4.2 Outdoor unit trouble shooting 7.4.2.1 E0 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code Malfunction PCB main chip does not receive feedback from EEPROM chip conditions ● Installation mistake Potential causes ● Faulty PCB Trouble shooting: Outdoor EEPROM malfunction Outdoor EEPROM malfunction Power off, then restart the Power off, then restart the...
  • Page 56 7.4.2.2 E2(Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code Malfunction Indoor unit does not receive the feedback from outdoor unit during 120 seconds or outdoor unit does not receive the conditions feedback from any one indoor unit during 180 seconds. ●...
  • Page 57 Communication malfunction between indoor and outdoor units Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 58 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and 3 port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for 3 port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 59 Pic 2: IPM board (for 2 zone/ 3-zone) Operating Standby els)
  • Page 60 Pic 2: IPM (for5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 61 PIC 4: Check point button, press 1 time for check how many indoor units are connected.
  • Page 62 7.4.2.3 E3 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code Malfunction PCB main chip does not receive feedback from IPM module during 60 seconds. conditions ● Wiring mistake Potential causes ● Faulty PCB Trouble shooting: Communication malfunction between IPM board and outdoor main board Is there at least one LED in...
  • Page 63 Remark: Use a multimeter to test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V. Use a multimeter to test the DC voltage between black pin and red pin of signal wire. The normal value should be around 12V.
  • Page 64 7.4.2.4 E4 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and solution. Error Code E4/F1/F2/F3/F4/F5 Malfunction If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
  • Page 65 7.4.2.5 E5 (Over-voltage or under-voltage protection) diagnosis and solution. Error Code Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. ● Power supply problems. Potential causes ● System leakage or block ● Faulty PCB Trouble shooting: Voltage protection Check the voltage of...
  • Page 66 IPM board (for 2-zone /3-zone)
  • Page 67 Bridge rectifier (for 2-zone/3-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. P(or E1/E2/E3)-N(GND) (for 2-zone/3-zone) Bridge rectifier (for 2-zone/3-zone) IPM Module (for 2-zone/3-zone)
  • Page 68 IPM board (for 4-zone)
  • Page 69 Bridge rectifier (for 5-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. IPM board (for 5-zone) IPM Module (for 5-zone)
  • Page 70 7.4.2.6 E6 (PFC module protection) error diagnosis and solution. Error Code Malfunction When the voltage signal that PFC sends to main control board is abnormal, the display LED will show “E6” and AC will turn conditions off. ● Wiring mistake Potential causes ●...
  • Page 71 Inductance Two ports of the inductance...
  • Page 72 7.4.2.7 E8 (Outdoor fan speed malfunction) diagnosis and solution Error Code Malfunction conditions When outdoor fan speed keeps too low (300RPM) or too high(2400RPM) for certain time, the unit will stop and the LED will display the failure. ● Wiring mistake Potential causes ●...
  • Page 73 Index 1:  1. DC fan motor(control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.
  • Page 75 7.4.2.8 P1 (High pressure protection) diagnosis and solution. Error Code Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ● Faulty outdoor PCB Trouble shooting:...
  • Page 76 High pressure protection High pressure protection Whether the wiring Whether the wiring between the high pressure between the high pressure switch and main control switch and main control Connect it well Connect it well board is connected well or board is connected well or correctly correctly Whether the high...
  • Page 78 7.4.2.9 P2 (Low pressure protection) diagnosis and solution. Error Code Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ● Faulty outdoor PCB Trouble shooting:...
  • Page 79 Low pressure protection Low pressure protection Whether the wiring Whether the wiring between the low pressure between the low pressure protector and main control Connect it well protector and main control Connect it well board is connected well or board is connected well or correctly correctly Whether the low...
  • Page 81 7.4.2.10 P3 (Current overload protection) diagnosis and solution. Error Code Malfunction conditions If the outdoor current exceeds the current limit value, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ●...
  • Page 82 Current protection of compressor Current protection of compressor Judge 1: Check whether the input Judge 1: Check whether the input current of the power supply wire current of the power supply wire is more than 12.5A(18K) (For Replace outdoor main board is more than 12.5A(18K) (For Replace outdoor main board 27K, it is 17.For 30K, it is 18.5.For...
  • Page 84 7.4.2.11 P4 (Temperature protection of compressor discharge) diagnosis and solution. Error Code Malfunction conditions When the compressor discharge temperature(T5) is more than 115℃ for 10 seconds, the compressor will stop restart till T5 is less than 90℃. ● Refrigerant leakage Potential causes ●...
  • Page 85 7.4.2.12 P5 (High temperature protection of condenser) diagnosis and solution. Error Code Malfunction conditions When outdoor pipe temperature is more than 65° C, the unit will stop, and unit runs again when outdoor pipe temperature is less than 52° C ●...
  • Page 86 7.4.2.13 P6 (Inverter module (IPM) malfunction) diagnosis and solution. Error Code Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P6” and AC will turn off. ● Wiring mistake Potential causes ●...
  • Page 87 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36-48KBtu/h Check whether the connecting Connect it tightly,...
  • Page 88 7.4. 2.14 . High temperature protection of compressor top(IDU P2/ODU P0) Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Faulty overload protector ● Wiring mistake ● System leakage or block ●...
  • Page 89 7.4. 2.15 The cooling operation or heating operation does not operate. ● Faulty 4-way valve Potential causes Check of 4-way, please refer to part 5 in 9.5 Trouble Criterion Of Main Parts. 7.4.2.16 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 90 Appendix 1 Temperature Sensor Resistance Value Table (℃--K) ℃ ℃ ℃ ℃ K Ohm K Ohm K Ohm K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5000 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865 10.4736 2.03732 0.56038 84.2190 10.000 1.96532...
  • Page 91 Appendix 2 Unit: ℃---K Discharge temp. sensor table 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5 57.37 11.79 3.296 406.7 54.89 11.38 3.203 384.3 52.53 10.99 3.113 363.3 50.28 10.61 3.025 343.6 48.14 10.25 2.941...
  • Page 92 Appendix 3: ℃ 10 11 12 13 14 15 16 17 18 19 20 21 22 ℉ 48 50 52 54 56 58 60 62 64 66 68 70 72 ℃ 23 24 25 26 27 28 29 30 31 32 33 34 35 ℉...
  • Page 93 3. IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Normal Normal resistance Digital tester Digital tester resistance value...
  • Page 94 Position Resistance Value YDK53- YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B YDK45-6B YSK25-6L 6FB(B) 56Ω± 8% 24.5Ω± 8% 317Ω± 8% 145Ω± 8% 345Ω± 8% 627Ω± 8% 88.5Ω± 8% Black - (20℃) (20℃) (20℃) (20℃) (20℃) (20℃) (20℃) 76Ω± 8% 19Ω± 8% 252Ω± 8% 88Ω±...
  • Page 95 6.EXV check Disconnect the connectors.
  • Page 96 Resistance to EXV coil Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White...
  • Page 97 Red- Blue Red - Yellow...
  • Page 98 Brown-Orange...
  • Page 99 Brown-White...
  • Page 100 Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine.  M2OF-18HFN1-M (WCA30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) Turn off the air conditioner ② and turn off the power breaker.
  • Page 101 cover. (3 screws) 6) Remove the cover of electrical control box. ⑦ 7) Disconnect the fan motor connector CN14(3p,white) from the IPM board. ⑧ 8) Remove the fan motor after unfastening four fixing screws. Panel plate How to remove the panel plate.
  • Page 102 Screws of front panel 2) Remove the screws of big handle, and remove the big handle.(4 screws) 3) Remove two screws of Screws terminal board and seven of big handle screws of right-rear panel, and remove the right-rear panel. Screws of terminal board Screws of right- rear panel...
  • Page 103 Electrical How to remove the electrical parts parts. 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. IPM board PCB board Unfasten the connector ④ of the reactor. Unfasten the connector of the compressor. ③...
  • Page 104 CN17:T3/T4 temperature sensor CN15 CN17 CN18/CN19 CN25/CN23 (2p/2p,white) CN7: Discharge temperature sensor (2p,white) CN15:T2B-A,B temperature sensor (2p/2p,white) CN18/CN19: Electronic expansion valve A,B (6p/6p,red/red) CN25/CN23: S-A,S-B (3p/3p,white/white) Wires: CN5/CN6 CN1/CN2 CN1/CN2: 4-way valve (blue-blue) CN5/CN6: Crankcase heating cable (red-red) ⑧ CN3:L-IN (red) CN4:N-IN (black) Disconnect the grounding wire (yellow-green)
  • Page 105 Compressor How to remove the compressor. 1) Perform work of item 1,2. 2) Remove the cover of electrical control box. 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of ⑥...
  • Page 106 Reactor How to remove the reactor 1) Perform work of item 2 2) Unfasten the connector between IPM and reactor. ② 3) Remove three screws of reactor, and remove the reactor. Screws of cover of inductance The 4-way How to remove the 4-way valve valve 1) Perform work of item 2.
  • Page 107 How to remove the expansion expansion valve valve 1) Perform work of item 1,2. 2) Remove the electrical parts Expansion valves from item 3.. 3) Remove the coils. 4) Detach the welded parts of Coils expansion valves and pipes.  M3OF-27HFN1-M (WD30 metal plate) Part name Procedures Remarks...
  • Page 108 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear panel.
  • Page 109 Screws of right-rear panel Screws of terminal board...
  • Page 110 How to remove the fan assembly. assembly 1) Remove the top cover, right front side panel and ② front panel from item 1.step 2) Remove the hex nut fixing the fan. ④ 3) Remove the fan. 4) Remove the cover of electrical control box cover.
  • Page 111 How to remove the electrical ③ parts. Electrical parts 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. Unfasten the connector of the reactor. IPM board PCB board Unfasten the connector of the compressor. Disconnect following 3 ④...
  • Page 112 Disconnect the CN17 CN15 CN7 CN18/CN19/CN22 connectors and wires connected from PCB and other parts. Connectors: CN17:T3/T4 temperature sensor (2p/2p,white) CN20 CN7: Discharge temperature sensor CN23 (2p,white) CN25 CN12:Ttop temperature sensor(2p,white) CN15:T2B-A,B,C temperature sensor (2p/2p/2p,white) CN18/CN19/CN22: Electronic expansion valve A,B,C (6p/6p/6p,red/red/red) CN1/CN2 CN5/CN6...
  • Page 113 How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate. ⑥ 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of compressor thermo and...
  • Page 114 Reactor How to remove the reactor 1) Perform work of item 1,2 2) Unfasten the connector between IPM and reactor. 3) Remove two screws of cover of inductance, and remove the cover of Screws of cover of inductance inductance 4) Disconnect two pieces of wires connected from the cover of inductance.
  • Page 115 How to remove the expansion expansion valve valve 1) Perform work of item 1,2. 2) Remove the electrical parts Expansion valves from item 3. 3) Remove the coils. 4) Detach the welded parts of expansion valves and pipes.  M4OF-36HFN1-M (WD30 metal plate) Part name Procedures Remarks...
  • Page 116 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear panel.
  • Page 117 Screws of right-rear panel Screws of terminal board How to remove the fan assembly. assembly 1) Remove the top cover, ② right front side panel and front panel from item 1.step 2) Remove the hex nut fixing the fan.
  • Page 118 3) Remove the fan. ④ 4) Unfix the hooks and remove the screws, then open the electronic control box. 5) Disconnect the fan motor ⑤ connector CN19(3p,white) from the driver board. Remove the fan motor after unfastening four fixing ⑥ screws.
  • Page 119 pieces of connection wires and ④ connectors between driver board and PCB. CN55-CN7(7p,white) CN54-CN6(red) CN53-CN5(black) 6) Remove the fixing screws, then move the driver board. Disconnect the CN53 connectors and wires CN54 connected from PCB and other parts. Connectors: CN8:T3/T4 temperature sensor (2p/2p,white) CN55 CN33: Discharge temperature sensor...
  • Page 120 CN10/CN44: Crankcase heating cable (black-red) CN13 CN1:L1-IN (red) CN33 CN10 CN2:L2-IN (black) CN22 CN40 CN2 CN1 CN44 Disconnect the grounding wire (yellow-green) after removing the right-rear panel. 9) Remove the PCB board. ⑧ How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate.
  • Page 121 6) Remove the discharge pipe and suction pipe with a burner. 7) Remove the hex nuts and washers fixing the compressor to bottom plate. 8) Lift the compressor. The 4-way How to remove the 4-way valve valve Coil 1) Perform work of item 1,2. 2) Extract refrigerant gas.
  • Page 122  M5OF-48HFN1-M (WE30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. Turn off the air ② conditioner. Turn off the power breaker. 2) Remove the screws of air outlet grille(8 screws) 3) Remove the hex nut fixing the fan.
  • Page 123 6) Remove the screws of front side panel, and remove the front side panel (1 screw) 7) Disconnect the fan motor connectors FAN1(3p,white) and FAN2(3p,white) from DC motor driver board. ⑥ 8) Remove the fan motor after unfastening fixing screws. ⑦...
  • Page 124 Panel plate How to remove the panel plate. 4) Remove big handle.(2 Screws screws) and water of big handle collector(2 screws) 5) Remove 2 screws of Screws of Water collector terminal board and 15 screws of right-rear panel, and remove the right-rear Screws of panel.
  • Page 125 DC Fan Driver board 2) Disconnect the fan motor Connector(5p,white) from the IPM board. Disconnect following 8 pieces of connection wires and connectors between IPM and other parts. CN2(yellow) CN1(red) CN6(black) CN3(yellow) U、V、W(black) CN9(10p,white) 4) Remove the fixing screws then remove the IPM board. Disconnect the connectors and wires connected from PCB and other...
  • Page 126 (2p,white) CN12：Heatsink temperature sensor(2p,red) CN9:T3/T4 temperature sensor (2p/2p,white) CN13 CN16 CN11:T2B-A,B,C,D,E temperature CN21 sensor (2p/2p/2p/2p/2p,white) CN29 CN37 CN15/CN23/CN26/CN30/CN33: CN8 CN12 Electronic expansion valve CN9 CN11 (6p/6p/6p/6p/6p,red) CN37/CN29/CN21/CN16/CN13: S- A,S-B,S-C,S-D,S-E (3p/3p/3p/3p/3p,white) CN10: High and low pressure switch (2p/2p, white) Wires: CN10 CN17/CN18: 4-way valve (blue-blue) CN30/CN23 CN19/CN20: connected to crankcase...
  • Page 127 Compressor How to remove the compressor. 1) Perform work of item 1 step 5~6 and item 2.. ⑤ 2) Extract refrigerant gas. 3) Remove the sound insulation material and crankcase heating cable. 4) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater and compressor from the terminal.
  • Page 128 The 4-way How to remove the 4-way valve valve 6) Perform work of item 1 step 5~6 and item 2.. Coil 7) Extract refrigerant gas. Welded parts 8) Remove the electrical parts from item 3. 9) Remove fixing screw of the coil, and remove the coil.

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M2of-18hfn1-mM3of-27hfn1-mM4of-36hfn1-mM5of-48hfn1-mDlcmrah36dak

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