Midea ODMFI-E-2110 Service Manual
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Midea ODMFI-E-2110 Service Manual

Multi outdoor units
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CONDENSING UNITS
Revision K:
Model Numbers:
M2OF-18HFN1-M
M5OF-48HFN1-M
M4OH-36HFN1-M
M3OJ-27HFN1-M
M2OA-18HFN1-M

Table of Contents

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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-2110
M3OF-27HFN1-M
M2OH-18HFN1-M
M5OG-48HFN1-M-[X] M2OI-18HFN1-M
M3OI-28HFN1-M
M4OI-36HFN1-M
M4OF-36HFN1-M
M3OH-27HFN1-M
M4OG-36HFN1-M
M5OG-48HFN1-M
1
Multi zone

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Summary of Contents for Midea ODMFI-E-2110

  • Page 1: Table Of Contents

    Multi outdoor units Multi zone SERVICE MANUAL CONDENSING UNITS Revision K: ODMFI-E-2110 Model Numbers: M2OF-18HFN1-M M3OF-27HFN1-M M4OF-36HFN1-M M5OF-48HFN1-M M2OH-18HFN1-M M3OH-27HFN1-M M4OH-36HFN1-M M5OG-48HFN1-M-[X] M2OI-18HFN1-M M3OJ-27HFN1-M M3OI-28HFN1-M M4OG-36HFN1-M M2OA-18HFN1-M M4OI-36HFN1-M M5OG-48HFN1-M Table of Contents Indoor Unit Combination Dimension Of Outdoor Unit Refrigerant Cycle Diagram...
  • Page 2 CONTENTS Indoor Unit Combination ........................5 Dimension Of Outdoor Unit ....................... 8 Refrigerant Cycle Diagram .......................10 Installation Details ..........................14 4.1 Wrench torque sheet for installation ....................14 4.2 Connecting the cables ........................14 4.3 Pipe length and the elevation ......................14 4.4 First-Time Installation ........................14 4.5 Adding Refrigerant after Long-Term System Operation ..............16 4.6 Procedure when servicing the indoor unit refrigeration circuit.
  • Page 3 M2OH-18HFN1-M, M3OF-27HFN1-M, M3OH-27HFN1-M (WD30 metal plate) ......151 M4OF-36HFN1-M (WD30 metal plate) ..................159 M4OH-36HFN1-M, M5OF-48HFN1-M (WE30 metal plate) ............166...

  • Page 5: Indoor Unit Combination

    Indoor Unit Combination Multi DC Outdoor Nominal Suggested Limit Unit capacity Combination 6+12 M2OF-18HFN1-M 5.2kW None M2OA-18HFN1-M 9+12 12+12 6+12 6+18 M2OH-18HFN1-M 5.2kW None M2OI-18HFN1-M 9+12 12+12 Suggested Combination Multi DC Outdoor Nominal Limit Unit capacity Two units Three units 6+12 6+6+6 6+12+12...
  • Page 6 Suggested Combination Multi DC Outdoor Unit Nominal capacity Limit Two units Three units Four units 6+18 6+6+12 9+9+12 6+6+6+6 6+9+9+18 6+24 6+6+18 9+9+18 6+6+6+9 6+9+9+24 9+18 6+6+24 9+9+24 6+6+6+12 6+9+12+12 9+24 6+9+12 9+12+12 6+6+6+18 6+9+12+18 12+12 6+9+18 9+12+18 6+6+6+24 6+12+12+12 12+18 6+9+24 9+12+24...
  • Page 7 Multi DC Suggested Combination Nominal Outdoor Limit capacity Three units Four units Five units Unit units 9+24 6+6+24 9+12+18 6+6+6+18 6+9+18+30 6+6+6+6+9 6+6+12+12+12 9+30 6+6+6+24 6+12+12+12 6+6+6+6+12 6+6+12+12+18 6+6+30 9+12+24 9+36 6+6+6+30 6+12+12+18 6+6+6+6+18 6+6+12+12+24 6+6+36 9+12+30 12+24 6+6+6+36 6+12+12+24 6+6+6+6+24 6+6+12+18+18 6+9+24...

  • Page 8: Dimension Of Outdoor Unit

    Dimension Of Outdoor Unit Model Unit M2OF-18HFN1-M inch 33.3 14.3 27.6 36.0 21.3 13.8 M2OA-18HFN1-M inch 35.04 13.46 26.50 38.98 26.10 13.94 M2OH-18HFN1-M 1034 M3OF-27HFN1-M M3OH-27HFN1-M M2OI-18HFN1-M inch 37.2 16.5 31.9 40.6 26.5 15.9 M3OJ-27HFN1-M M3OI-28HFN1-M 1034 M4OF-36HFN1-M M4OG-36HFN1-M inch 37.2 16.5 31.9...
  • Page 9 Unit Model M4OH-36HFN1-M 1333 1060 M5OF-48HFN1-M M5OG-48HFN1-M-[X] inch 37.5 16.3 52.5 41.7 25.0 15.9 M4OI-36HFN1-M M5OG-48HFN1-M...

  • Page 10: Refrigerant Cycle Diagram

    Refrigerant Cycle Diagram 3.1 Refrigeration circuit drawing of M2OF-18HFN1-M, M2OA-18HFN1-M INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE Condenser temp. sensor HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp. sensor temp. sensor (CONDENSER) T2B-A Evaporator...
  • Page 11 3.3 Refrigeration circuit drawing of M3OF-27HFN1-M, M3OH-27HFN1-M, M3OJ-27HFN1-M& M3OI-28HFN1-M INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE EXV C LIQUID VALVE C Condenser temp. sensor HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp.
  • Page 12 3.5 Refrigeration circuit drawing of M4OI-36HFN1-M INDOOR OUTDOOR EXV A LIQUID VALVE A Radiator for IPM EXV B LIQUID VALVE B EXV F EXV C LIQUID VALVE C Condenser EXV D temp. sensor LIQUID VALVE D HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE...
  • Page 13 3.7 Refrigeration circuit drawing of M5OG-48HFN1-M-[X] INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B Radiator for IPM Plate heat EXV G exchanger EXV F EXV C LIQUID VALVE C EXV D LIQUID VALVE D Condenser temp. sensor CHECK VALVE EXV E LIQUID VALVE E...

  • Page 14: Installation Details

    Caution: Installation Details ● Refrigerant pipe diameter different 4.1 Wrench torque sheet for installation according to indoor unit to be connected. When using the extension pipe, refer to the Outside diameter Torque Additional tightening torque tables below. ● When refrigerant pipe diameter is different inch N.cm N.cm...
  • Page 15 1. Air Purging Using the Vacuum Pump 2. Adding refrigerant if the pipe length exceeds chargeless pipe length Procedure: 1) Connect the charge hose to the charging cylinder and open the 2-way and 3-way valves. 1. Completely tighten the flare nuts on the With the charge hose you disconnected from the indoor and outdoor units.

  • Page 16: Adding Refrigerant After Long-Term System Operation

    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 17: Evacuation After Servicing The Outdoor Unit Refrigeration Circuit

    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 18 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 19: Electronic Function

    5.3.3 Fan Speed Malfunction 5. Electronic Function ---- If outdoor fan speed is lower than 100RPM higher than 2400RPM for 60 seconds or more, 5.1 Abbreviation the unit stops and LED displays failure code. T1: Indoor ambient temperature 5.3.4 Inverter Module Protection. T2: Middle indoor heat exchanger coil ---- The inverter protection module ensures that temperature...
  • Page 20 and shutdown current CoolT4Zone5I ℃ HeatT4Zone4I T4≥15℃ Heating current limit value HeatT4Zone3I 14℃＞T4≥10℃ Heating current limit value HeatT4Zone2I CoolT4Zone4I 9℃＞T4≥6℃ Heating current limit value HeatT4Zone1I 5℃＞T4 Heating current limit value Heating stop protection current HeatStopI value CoolT4Zone3I For M4OI-36HFN1-M, M5OG-48HFN1-M, M5OG- 48HFN1-M-[X], CoolT4Zone2I CoolReturnI...

  • Page 21: Control And Functions

    When the compressor is off and T4 is lower than - HeatT4Zone- -10℃＞T4 Heating current limit 35℃ for 10 seconds, the unit stops and displays value “LP” or “PC0L” HeatStopI Heating stop protection current value When the compressor is on and T4 remains lower than -40℃...
  • Page 22 … COOL Frequency (Hz) L_F2 … L_F1 L_F2 _F24 Note: The final result is an integer. Amendatory … capacity Then modify it according to a T2 average … demand. (correction): Note:Average value of T2：Sum T2 value of all The maximum running frequency is adjusted indoor units)/ (indoor units number according to the outdoor ambient temperature ℃...
  • Page 23 4) If the compressor cumulative running time reaches 120 minutes and T3<-15℃. ℃ 5) If the air conditioner is shut down from heating Standby mode, it will enter defrost if any of the following conditions are met (this condition can be shielded Fmax=T4FREHEATMAX1 by parameters): Fmax=T4FREHEATMAX2...
  • Page 24 When T3≥38 ℃ (100.4 ℉) or when T4≥15 ℃ (59 4-way valve defrosting Defrosting over ℉), the outdoor fan chooses a speed according compressor to T4 again. Max 10 minutes frequency Cool-F9 frequency Compressor stops TimeA 10S 30S Indoor fan Anti-cold control Exit low ambient cooling mode...
  • Page 25 run, otherwise the initial cooling opening is run, and the internal machine is not connected. deal with 7k unit). 2.3 Main EXV action: When the compressor is off, the main EXV keeps the opening degree when Breeze fan speed the compressor is turned off within the first 90 seconds.
  • Page 26 The initial open angle of the EXV depends on the size of the indoor model. The adjustment range is 150-350p. When the unit has been running for 3 minutes, the outdoor unit receives the indoor units' indoor units' capacity demand and T2 information and then calculates their average.

  • Page 27: Wiring Diagrams

    Wiring Diagrams 6.1 Wiring diagram of 1 drive 2 outdoor M2OF-18HFN1-M, M2OH-18HFN1-M, M2OI-18HFN1-M...
  • Page 28 M2OA-18HFN1-M...
  • Page 29 6.2 Wiring diagram of 1 drive 3 outdoor M3OF-27HFN1-M...
  • Page 30 M3OJ-27HFN1-M, M3OI-28HFN1-M...
  • Page 31 M3OH-27HFN1-M...
  • Page 32 6.3 Wiring diagram of 1 drive 4 outdoor M4OF-36HFN1-M...
  • Page 33 M4OH-36HFN1-M M4OG-36HFN1-M...
  • Page 34 M4OI-36HFN1-M 16022000036850 MAIN CONTRO L BOARD ELECTRONIC EX P ANSIVE VALVE HEAT_D CHASSIS HE ATER HEAT_Y REVERSING VALVE COMP TOP COMP. TOP OLP TEMP. SENSOR...
  • Page 35 6.4 Wiring diagram of 1 drive 5 outdoor M5OF-48HFN1-M...
  • Page 36 M5OG-48HFN1-M-[X] M5OG-48HFN1-M 16022000036851 MAIN CONTRO L BOARD ELECTRONIC EX PANSIVE VALVE HEAT_D CHASSIS HE ATER HEAT_Y REVERSING VALVE COMP TOP COMP. TOP OLP TEMP. SENSOR...
  • Page 37 PCB board of M2OF-18HFN1-M, M3OF-27HFN1-M, M2OH-18HFN1-M, M2OI-18HFN1-M, M3OJ- 27HFN1-M, M3OI-28HFN1-M, M4OG-36HFN1-M Name Meaning T3: condenser temperature sensor T3/T4 CN17 T4: outdoor ambient temperature sensor connect to discharge sensor TESTPORT CN26 connect to DR board CN1 LOW/HIGH CN14 Red: low pressure protect...
  • Page 38 Yellow: high pressure protect Comp Top CN12 compressor top temperature sensor L-OUT L-OUT connect to IPM board CN4 N-OUT N-OUT connect to IPM board CN5 CN32 CN32 connect to DR board CN5 CN33 CN33 connect to DR board CN5 N-in N_in: connect to N-line (208-230V AC input) HEAT2 CN8/CN9...
  • Page 39 IPM board of M2OF-18HFN1-M, M3OF-27HFN1-M, M2OH-18HFN1-M, M2OI-18HFN1-M, M3OJ- 27HFN1-M, M3OI-28HFN1-M, M4OG-36HFN1-M Name Meaning connect to main board L-Out connect to main board N-Out CN_Reactor CN2/CN3 connect to reactor CN_COMP CN_COMP connect to compressor connect to main board CN21 AN_DC CN14 connect to outdoor DC fan...
  • Page 40 PCB board of M2OA-18HFN1-M Name Meaning CN11 L_in: connect to N-line (208-230V AC input) Power Supply CN12 N_in: connect to L-line (208-230V AC input) connect to Electric Expansion Valve A Electronic connect to Electric Expansion Valve B Expansion CN34 connect to Electric Expansion Valve C valve connect to Electric Expansion Valve D CN10...
  • Page 41 connect to pipe temp. sensor T3, ambient temp. sensor T4, exhaust T3 T4 TP CN26 temp. sensor TP OLP TEMP. CN30 connect to compressor top temp. sensor (5VDC Pulse wave) SENSOR connect to high and low pressure swtich(pin1-pin2&pin3-pin4:5VDC H-PRO,L-RPO CN29 pulse wave) TESTPORT CN24...
  • Page 42 PCB board of M4OF-36HFN1-M & M3OH-27HFN1-M Name Meaning Current loop communication A, signal wire, connect to the terminal (24V CN30 DC Pulse wave) Current loop communication B, signal wire, connect to the terminal (24V CN29 DC Pulse wave) Current loop communication C, signal wire, connect to the terminal (24V CN28 DC Pulse wave) CN27...
  • Page 43 DC Pulse wave) Current loop communication E, signal wire, connect to the terminal (24V CN26 DC Pulse wave) L-IN Power supply, connect to the terminal (208-230V AC) N-IN TESTPORT CONdebug connect to detector Fuse Fuse 1 Fuse T30A/250V Digital display button DSP1 DSP1 Digital display...
  • Page 44 IPM board of M4OF-36HFN1-M & M3OH-27HFN1-M Name Meaning OUT FAN CN19 (DC) Connect to DC motor Connect to compressor W Connect to compressor V Connect to compressor U CN54 CN54 Connect to main PCB CN6 CN51 CN51 Connect to PFC inductor...
  • Page 45 CN53 CN53 Connect to main PCB CN5 CN52 CN52 Connect to PFC inductor CN55 CN55 Connect to main PCB CN7...
  • Page 46 PCB board of M5OF-48HFN1-M & M4OH-36HFN1-M...
  • Page 47 Name Meaning N_in: connect to N-line (208-230V AC input) Power Supply L_in: connect to L-line (208-230V AC input) CN13 CN16 CN21 CN29 S: connect to indoor unit communication(pin1-pin2: 24VDC Pulse wave; CN39 pin2-pin3: 208-230V AC input) HEAT_D CN19/CN20 connect to the heater, 208-230V AC when is ON HEAT_Y CN24/CN25 CN17/...
  • Page 48 INDOOR PIPE CN11 OUT TEMP connect to evaporator coil outlet temperature sensor T2B TESTPORT CN35 used for testing connect to IPM board CN22 CN22 485 communication connect to IPM board(208-230V AC input) IPM board of M5OF-48HFN1-M& M4OH-36HFN1-M...
  • Page 49 Name Meaning Connect to compressor 0V AC (standby) 10-200V AC (running) Connect to main PCB FAN1 CN11 connect to DC motor driver board FAN2 PFC-L1 connect to reactor PFC-L2 PFC-L1 connect to bridge PFC-L2...
  • Page 50 PCB Board of M5OG-48HFN1-M-[X], M4OI-36HFN1-M& M5OG-48HFN1-M...
  • Page 51 Name Meaning L1_in: connect to L1-line (230V AC input) Power Supply L2_in: connect to L2-line (230V AC input) Exhaust temp. sensor TP TESTPORT CN35 used for testing HEAT1 CN19/CN20 connect to chassis heater, 208-230V AC when is ON HEAT2 CN24/CN25 connect to compressor heater, 208-230V AC when is ON CN17/ 4-WAY...
  • Page 52 IPM board of M5OG-48HFN1-M-[X] , M4OI-36HFN1-M& M5OG-48HFN1-M...
  • Page 53 Name Meaning connect to main board L-Out Power Supply connect to main board N-Out Connect to main PCB CN6 FAN_DC FAN_1/FAN_2 connect to outdoor DC fan 1& DC fan 2 CN_COMP Connect to compressor...

  • Page 54: Troubleshooting

    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 55: Indoor Unit Error Display

    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 56 ★ ★ —— 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 57 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; MS11M-30HRFN1- MR0W, MS11M-36HRFN1-MN10W 2) Aurora: MSABB-09HRFN1-MT0W, MSABB-12HRFN1-MT0W, MSABE-18HRFN1-MT0W, MSABE-24HRFN1- MT0W; MSABF-30HRFN1-MR0W, MSABF-36HRFN1-MP0W 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 58: Outdoor Unit Display

    —— Indoor PCB/Display board communication error ★ 9 times 0b/Eb —— ★ 8 times Water-level alarm malfunction —— Refrigerant leakage detection ★ 7 times —— ★ 1 time  Current overload protection ★ 2 times  Outdoor ambient temperature sensor (T4 ) malfunction ★...
  • Page 59 ★ 5 times EC 53 Outdoor ambient temperature sensor (T4 ) malfunction ★ 5 times EC 52 Condenser coil temperature sensor (T3) malfunction ★ 5 times EC 54 Compressor discharge temperature sensor (T5) malfunction ★ 5 times EC 51 Outdoor unit EEPROM parameter error ★...
  • Page 60 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 61 units' amendatory capacity demand 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 62 F indoor unit capacity F indoor unit capacity demand code F indoor unit evaporator outlet temperature (T F indoor unit room temperature (T F indoor unit evaporator temperature (T EXV open angle for F indoor unit Reason of stop EVI valve target angle(only for M5OG- Actual data/4.
  • Page 63 Indoor unit A capacity demand code Indoor unit B capacity demand code Norm code*HP Indoor unit C capacity demand code (9K: 1HP,12K: 1.2HP,18K: 1.5HP,24K:2.0HP) Indoor unit D capacity demand code Indoor unit E capacity demand code Outdoor unit amendatory capacity demand code The frequency corresponding to the total indoor units' amendatory capacity demand The frequency after the frequency limit...
  • Page 64 Bit4 show 2A, then Reserve. Bit5=1, Bit3=1, Bit3 Frequency limit caused by IPM. and Bit1=1. This means that Bit2 Frequency limit caused by T5. a frequency limit may be caused Bit1 Frequency limit caused by T3 by current, IPM Bit0 or T3.
  • Page 65 7.3.3 Outdoor unit error display For other models, 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 66 M2OA-18HFN1-M, M2OI-18HFN1-M, M3OJ-27HFN1-M, M3OI-28HFN1-M, M4OG-36HFN1-M, M4OI-36HFN1-M, M5OG-48HFN1-M Display LED STATUS EC 51 Outdoor EEPROM malfunction EL 01 Indoor / outdoor units communication error PC 40 Communication malfunction between IPM board and outdoor main board PC 08 Outdoor overcurrent protection PC 10 Outdoor unit low AC voltage protection PC 11 Outdoor unit main control board DC bus high voltage protection...

  • Page 67: Diagnosis And Solution

    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 68 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 69 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 70 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 71 Pic 2: IPM (for 2 zone/ 3-zone) Operating Standby els)
  • Page 72 Pic 2: IPM (for 4 zone&5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 73 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 74 7.4.1.4 Indoor fan speed malfunction diagnosis and solution. When indoor fan speed is too low (300RPM) for a certain period of time, Malfunction conditions the unit ceases operation and the LED displays a failure code. Potential causes Wiring mistake ● Faulty fan assembly ●...
  • Page 75 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 76 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 77 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 78 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 79 7.4.1.7 Over-voltage or under-voltage protection diagnosis and solution. Outdoor unit low AC voltage protection Outdoor unit main control board DC bus high voltage protection Outdoor unit main control board DC bus high voltage protection /341 MCE error Voltage protection Check the voltage of outdoor unit power supply, whether the voltage Check the power supply...
  • Page 80 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.
  • Page 81 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 82 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 83 Communication error between the indoor PCB and display board 7.4.1.12 Power off, then restart the unit after 2 minutes. Does a problem remain? The unit is operating normally Check the wirings and connections Are all the Ensure proper connections connections good? Replace the indoor main PCB Does the error still The problem is solved...
  • Page 84 7.4.1.13 Refrigerant Leakage Detection Power off, then restart the unit 2 minutes later. Does a problem remain? Put your hands in front of the indoor air outlet. Is there cool air blowing out from Check the T2 sensor. indoor air outlet? Is it securely Replace the attached?
  • Page 85 7.4.1.14 Communication malfunction between indoor two chips Shut off the power supply and turn it on 2 minutes later. Is it still displaying The unit is operating normally. the error code? Replace the indoor main PCB.
  • Page 86 7.4.2 Outdoor unit trouble shooting 7.4.2.1 E0/ EC 51 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code E0/ EC 51 Malfunction PCB main chip does not receive feedback from EEPROM chip conditions ● Installation mistake Potential causes ● Faulty PCB Trouble shooting: Outdoor EEPROM malfunction...
  • Page 87 7.4.2.2 E2/ EL 01 (Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code E2/ EL 01 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 88 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 89 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 90 Pic 2: IPM board (for 2 zone/ 3-zone) Operating Standby els)
  • Page 91 Pic 2: IPM (for 4 zone & 5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 92 PIC 4: Check point button, press 1 time for check how many indoor units are connected.
  • Page 93 7.4.2.3 E3/ PC 40 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code E3/ PC 40 Malfunction PCB main chip does not receive feedback from IPM module during 60 seconds. conditions ● Wiring mistake Potential causes ●...
  • Page 94 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 95 7.4.2.4 E4/EC 50 (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. Outdoor room temperature sensor T4 is in open circuit or has short circuited(EC 53) Compressor discharge temperature sensor T5 is in open circuit or has short circuited(EC 54) Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited(EC 56) Error Code...
  • Page 96 7.4.2.5 E5/ PC 10/PC 11/PC 12 (Over-voltage or under-voltage protection) diagnosis and solution. Error Code E5/ PC 10/PC 11/PC 12 Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. ● Power supply problems. Potential causes ●...
  • Page 97 IPM board (for 2-zone /3-zone) 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 98 IPM board (for 4-zone)
  • Page 99 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 100 7.4.2.6 E6/ PC 0F (PFC module protection) error diagnosis and solution. Error Code E6/ PC 0F 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.
  • Page 101 PFC module protection Check whether the connecting line between Connect it tightly, check main board and the PFC normal or not module(IPM module) is connected tightly Check whether the voltage range of P-N on IPM Replace the outdoor main board module is normal? DC277- 356V for 18-27KBtu/h;...
  • Page 102 Inductance Two ports of the inductance...
  • Page 103 7.4.2.7 E8/ EC 07 (Outdoor fan speed malfunction)/ EC 71(Over current failure of outdoor DC fan motor) diagnosis and solution Error Code E8/ EC 07/ EC 71 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.
  • Page 104 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 106  2. DC Fan Motor (control chip is in PCB) Release the UVW connector. Measure the resistance of U-V, U-W, and V-W. If the resistances are not equal to each other, the fan motor may be experiencing problems and need to be replaced.
  • Page 107 7.4.2.8 P1/PC 30 (High pressure protection) diagnosis and solution. Error Code P1/PC 30 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 ●...
  • Page 108 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 110 7.4.2.9 P2/PC 31 (Low pressure protection) diagnosis and solution. Error Code P2/PC 31 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 ●...
  • Page 111 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 113 7.4.2.10 P3/PC 08 (Current overload protection)/ PC 44(Outdoor unit zero speed protection)/PC 46(Compressor speed has been out of control)/PC 49(Compressor overcurrent failure) diagnosis and solution. Error Code P3/PC 08/PC 44/PC 46/PC 49 Malfunction conditions If the outdoor current exceeds the current limit value, the LED will display the failure.
  • Page 114 Current protection of compressor Judge 1: Check whether the input current of the power supply wire is more than 15A(18K) (For 27K&hyper heat 18K, it is Replace outdoor main board 18.5A.For 36K&hyper heat 27K, it is 22.5A.For 48K&hyper heat 36K, it is 28A) Check whether the refrigerant system is ok...
  • Page 116 7.4.2.11 P4/PC 06 (Temperature protection of compressor discharge) diagnosis and solution. Error Code P4/PC 06 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℃. ●...
  • Page 117 Temperature protection of Temperature protection of compressor discharge compressor discharge Check whether the Check whether the Check whether the Check whether the compressor discharge temp. is compressor discharge temp. is Stop leaking and add refrigerant Stop leaking and add refrigerant refrigerant is leak refrigerant is leak more than 115°C ?
  • Page 118 High temperature protection of High temperature protection of condenser Check the connection condenser Check the connection between temperature Correct the connection between temperature Correct the connection sensor and PCB. sensor and PCB. Check whether the Check whether the condenser temperature is condenser temperature is Check whether the Check whether the...
  • Page 119 ● Faulty outdoor PCB Trouble shooting:...
  • Page 120 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 121 7.4. 2.14 . High temperature protection of compressor top(IDU P2/ODU P0/PC 02) Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Faulty overload protector Supposed causes ● Wiring mistake ● System leakage or block ●...
  • Page 122 7.4. 2.15 Lack phase failure of outdoor DC fan motor(EC 72) Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code Check the wiring of fan motor.Are all the connections Correct the connections good? Check whether the three- phase resistance of the fan is...
  • Page 123 7.4. 2.16 Outdoor compressor lack phase protection(PC43) Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code Check both ends of compressor connecting Correct the connections line .Are all the connections good? Check whether the three- phase resistance of the Replace the compressor...
  • Page 124 7.4. 2.18 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. 7.4.2.19 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 125 7.4.2.17 Communication malfunction between adapter board and outdoor main control board(ODU Ed) Malfunction decision If outdoor PCB does not receive feedback from adapter board. conditions Supposed causes Wiring mistake ● Faulty PCB ● Power off, then restart the unit after 3 minutes.

  • Page 126: Trouble Criterion Of Main Parts

    7.5 Trouble Criterion of Main Parts. 1.Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 127 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 129 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 130 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 131 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 132 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 133 2 Turn off the power, use a digital tester to measure the resistance. The value should be 1.8~2.5 KΩ. 6.EXV check Disconnect the connectors.
  • Page 134 Red Brown Blue Orange Yellow White Resistance to EXV coil Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White...
  • Page 135 Red- Blue Brown-Orange Red - Yellow...
  • Page 136 Brown-White...

  • Page 137: Disassembly Instructions

    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 138 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 139 Screws of front panel 2) Remove the screws of big handle, and remove the big handle.(4 screws) Screws of big handle 3) Remove two screws of Screws of terminal board and seven terminal board screws of right-rear panel, and remove the right-rear panel.
  • Page 140 Electrical How to remove the electrical parts parts. 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. PCB board IPM board Unfasten the connector ④ of the reactor. Unfasten the connector of the compressor. ③...
  • Page 141 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 142 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 ⑥...
  • Page 143 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 144 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.  M2OA-18HFN1-M (WX430 metal plate) No.
  • Page 145 4) Remove the screws of front Screws of front panel panel, and remove the front panel. (7 screws) Screws of front panel 5) Remove the screws of water collector, and remove the water collector. (3 screws) Screws of water collector...
  • Page 146 Screws of terminal board 6) Remove two screws of terminal board, and 9 screws of right side panel, and remove the right side panel. Screws of right side board How to remove the fan assembly. assembly 1) Remove the top cover, right side panel and front ②...
  • Page 147 Remove the fan motor after unfastening four fixing screws. How to remove the electrical parts. Electrical parts 1) Perform work of item 1. ② 2) Remove 5 screws of the cover of electrical control box cover and remove it. 3) Cut the ribbon by a shear ③...
  • Page 148 6) Remove the support of electronic control box ⑥ 7) Disconnect the connectors and wires connected from PCB and other parts. 8) Disconnect the grounding wire (yellow-green) after removing the big handle ⑧ and the right-rear panel. 9) Remove the PCB board.
  • Page 149 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 150 The 4-way How to remove the 4-way valve valve Coil 1) Perform work of item 1,2. 2) Extract refrigerant gas. Welded parts 3) Remove the electrical parts from item 3. 4) Remove fixing screw of the coil, and remove the coil. 5) Detach the welded parts of 4-way valve and pipe.
  • Page 151  M2OH-18HFN1-M, M3OF-27HFN1-M, M3OH-27HFN1-M M2OI-18HFN1-M M3OJ-27HFN1-M M3OI-28HFN1-M M4OG-36HFN1-M (WD30 metal plate) No. Part name Procedures Remarks How to remove the panel Screws of Screws of top cover big handle plate. Panel plate Turn off the air conditioner. Turn off the power breaker.
  • Page 152 Screws of front panel 12) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear Screws of front panel panel. Screws of front panel Screws of right-rear panel...
  • Page 153 Screws of terminal board How to remove the fan assembly. assembly 5) Remove the top cover, right front side panel and ② front panel from item 1.step 6) Remove the hex nut fixing the fan. ④ 7) Remove the fan.
  • Page 154 8) Remove the cover of electrical control box cover. 9) Disconnect the fan motor ⑤ connector CN14(5p,white) from the IPM board. Remove the fan motor after unfastening four fixing screws. How to remove the electrical ③ parts. Electrical parts 10) Perform work of item 1,2. 11) Remove the four screws fixing the IPM board.
  • Page 155 pieces of connection wires and ④ connectors between IPM and PCB. CN1(5p,white) CN14(3p,white) CN3(red or brown) CN5(blue) ⑥ Remove the IPM board. Disconnect the connectors and wires connected from PCB and other CN15 CN7 CN17 CN18/CN19/CN22 parts. Connectors: CN17:T3/T4 temperature sensor (2p/2p,white) CN7: Discharge temperature sensor (2p,white)
  • Page 156 expansion valve A,B,C (6p/6p/6p,red/red/red) CN25/CN23/CN20: S-A,S-B,S-C (3p/3p/3p,white/white/white) Wires: CN20 CN1/CN2: 4-way valve (blue-blue) CN23 CN25 CN5/CN6: Crankcase heating cable (red-red) CN3:L1-IN (red) CN4:L2-IN (black) Disconnect the grounding wire (yellow-green) CN1/CN2 CN5/CN6 after removing the big handle and the right-rear panel. 18) Remove the PCB board.
  • Page 157 How to remove the compressor. Compressor 9) Perform work of item 1,2,3. 10) Remove the electrical control box and partition plate. ⑥ 11) Extract refrigerant gas. 12) Remove the sound insulation material and crankcase heating cable. 13) Remove terminal cover of compressor, and disconnect wires of compressor thermo and...
  • Page 158 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 159 How to remove the expansion expansion valve valve 5) Perform work of item 1,2. 6) Remove the electrical parts Expansion valves from item 3. 7) Remove the coils. 8) Detach the welded parts of expansion valves and pipes.  M4OF-36HFN1-M (WD30 metal plate) Part name Procedures Remarks...
  • Page 160 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 front panel screws of right-rear panel, and remove the right-rear panel.
  • Page 161 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 162 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 163 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 164 CN10/CN44: Crankcase heating cable (black-red) CN13 CN1:L1-IN (red) CN10 CN33 CN22 CN2:L2-IN (black) CN40 CN44 CN2 CN1 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 165 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 166  M4OH-36HFN1-M, 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 167 Screws of top cover 5) Remove the screws of top cover, and remove the top cover. (4 screws) 6) Remove the screws of front side panel, and remove the front side panel (1 screw) ⑥ 7) Disconnect the fan motor connectors FAN1(3p,white) and FAN2(3p,white) from DC motor driver board.
  • Page 168 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 169 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 170 CN8: Discharge temperature sensor (2p,white) CN12：Heatsink temperature sensor(2p,red) CN13 CN16 CN9:T3/T4 temperature sensor CN21 (2p/2p,white) CN29 CN37 CN8 CN12 CN11:T2B-A,B,C,D,E temperature CN9 CN11 sensor (2p/2p/2p/2p/2p,white) CN15/CN23/CN26/CN30/CN33: Electronic expansion valve (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) CN10 CN30/CN23/CN33/CN26/CN15...
  • Page 171 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 172 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.
  • Page 173  M5OG-48HFN1-M-[X], M4OI-36HFN1-M, M5OG-48HFN1-M (WE30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) 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 4) the fan.
  • Page 174 7) Remove the screws of front side panel, and remove the front side panel (1 screw) ⑥ 8) Disconnect the fan motor 9) connectors FAN1(3p,white) and ⑧ FAN2(3p,white) from DC motor driver board. 10) Remove the fan motor after unfastening fixing screws.
  • Page 175 Screws of terminal board Screws of right- rear panel Screws of right- rear panel Electrical How to remove the electrical parts parts. 1) Perform work of item 1 step 5~6 and item 2. Adapter board IPM board PCB board 2) Disconnect the fan motor Connector(5p,white) from the IPM board.
  • Page 176 3) Disconnect following 6 pieces of connection wires and connectors between IPM and other parts. CN3(red) CN2(black) U(blue),V(red),W(black) CN9(10p,white) CN8,CN5(3p) Remove the 4 screws and unfix the 4 hooks and then remove the IPM module board. Disconnect the CN13 connectors and wires CN16 CN21 connected from PCB and other...
  • Page 177 CN37/CN29/CN21/CN16/CN13/CN7: 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) ⑥ Wires: CN17/CN18: 4-way valve (blue-blue) CN19/CN20: connected to crankcase heating cable. (black-red) CN24/CN25: Electric heater of chassis (orange-orange) CN1:L-IN (red) CN3:N-IN (black) 6) Disconnect the grounding wire (yellow-green) after removing the big handle.
  • Page 178 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 179 The 4-way How to remove the 4-way valve valve 1) Perform work of item 1 step 5~6 and item 2. Coil 2) Extract refrigerant gas. Welded parts 3) Remove the electrical parts from item 3. 4) Remove fixing screw of the coil, and remove the coil.

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