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KOREL M2OC-18HFN8-Q Service Manual

Europe maket super dc inverter multi type, r32 dc multi outdoor units
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SERVICE MANUAL
TEHNIČKI PRIRUČNIK
KOREL AIRCONDITIONER
SUPER DC INVERTER MULTI TYPE
EUROPE MARKET
M3OF-21HFN8-Q
M3OF-27HFN8-Q
DC MULTI OUTDOOR UNITS
= K20C-18FN8 = K20C-18HFN8
= K30-21FN8
= K30-27FN8 = K30-37HFN8
= K40-36HFN8
= K50-42FN8

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Summary of Contents for KOREL M2OC-18HFN8-Q

  • Page 1: Service Manual

    SERVICE MANUAL TEHNIČKI PRIRUČNIK KOREL AIRCONDITIONER EUROPE MARKET SUPER DC INVERTER MULTI TYPE M2OG-14HFN8-Q = X = K20C-18FN8 = K20C-18HFN8 M2OC-18HFN8-Q M2OD-18HFN8-Q =x = K30-21FN8 M3OF-21HFN8-Q = K30-27FN8 = K30-37HFN8 M3OF-27HFN8-Q M3OE-27HFN8-Q = x = K40-36HFN8 M4OB-36HFN8-Q = K50-42FN8 M5OD-42HFN8-Q...

  • Page 2: Table Of Contents

    CONTENTS 1. General information of Outdoor Units ........2 2. Features .................. 3 3. Dimensions ................4 4. Refrigeration Cycle Diagram ..........5 5. Wiring diagram ............... 7 6. Indoor units combination ............ 14 7. Sound Levels ................ 16 8. Installation Details ............... 17 8.1 Wrench torque sheet for installation ................

  • Page 3: General Information Of Outdoor Units

    General information of Outdoor Units Model name Dimension (mm) Compressor KSN140D21UFZ M2OG-14HFN8-Q 800x333x554 KSM135D23UFZ M2OC-18HFN8-Q 800x333x554 KSN140D21UFZ M2OD-18HFN8-Q 800x333x554 KSN140D21UFZ M3OF-21HFN8-Q 845x363x702 KTF235D22UMT M3OE-27HFN8-Q 845x363x702 KTM240D57UMT M3OF-27HFN8-Q 845x363x702 KTF310D43UMT M4OB-36HFN8-Q 946x410x810 KTM240D57UMT M4OE-28HFN8-Q 946x410x810 KTF310D43UMT M5OD-42HFN8-Q 946x410x810...

  • Page 4: Features

    Features Outdoor unit Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation. Anti-rust cabinet Valve protection cover It protects the valves and prevents water from dripping.

  • Page 5: Dimensions

    Dimensions Unit：mm Model M2OG-14HFN8-Q M2OC-18HFN8-Q M2OD-18HFN8-Q M3OF-21HFN8-Q M3OE-27HFN8-Q M3OF-27HFN8-Q M4OE-28HFN8-Q 1034 M4OB-36HFN8-Q 1034 M5OD-42HFN8-Q 1034...

  • Page 6: Refrigeration Cycle Diagram

    Refrigeration Cycle Diagram 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 L I Q U I D V A L V E B...
  • Page 7 4.3 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 I L L A R Y A L IQ U ID V A L V E E X V B C A P I L L A R Y B L IQ U ID V A L V E C H E C K V A L V E...

  • Page 8: Wiring Diagram

    Wiring diagram M2OC-18HFN8-Q M2OG-14HFN8-Q...
  • Page 9 M2OD-18HFN8-Q...
  • Page 10 Note: S(1)&S(2) are used in other type of models. They don't need to be connected in multi models.
  • Page 11 M3OE-27HFN8-Q...
  • Page 12 M3OF-21HFN8-Q, M3OF-27HFN8-Q M4OE-28HFN8-Q...
  • Page 13 M4OB-36HFN8-Q...
  • Page 14 M5OD-42HFN8-Q...

  • Page 15: Indoor Units Combination

    Indoor units combination Indoor unit combination for M2OG-14HFN8-Q One unit Two unit 9+12 7+12 Indoor unit combination for M2OC-18HFN8-Q&M2OD-18HFN8-Q One unit Two unit 9+12 7+12 12+12 Indoor unit combination for M3OE-21HFN1-Q One unit Two unit Three unit 7+7+7 7+9+9 9+12...
  • Page 16 Indoor unit combination for M4OB-36HFN8-Q One unit Two unit Three unit Four unit 9+18 7+7+7 7+9+12 7+18+18 9+12+18 7+7+7+7 7+7+9+12 7+9+9+12 9+9+9+12 9+24 7+7+9 7+9+18 9+9+9 9+12+24 7+7+7+9 7+7+9+18 7+9+9+18 9+9+9+18 7+12 12+12 7+7+12 7+9+24 9+9+12 9+18+18 7+7+7+12 7+7+12+12 7+9+12+12 9+9+12+12 7+18 12+18 7+7+18 7+12+12 9+9+18...

  • Page 17: Sound Levels

    Sound Levels Outdoor Unit Microphone 1.0m Note: H= 0.5 × height of outdoor unit Model Noise Power dB(A) Noise level dB(A) M2OG-14HFN8-Q M2OC-18HFN8-Q M2OD-18HFN8-Q 55.5 M3OF-21HFN8-Q 57.5 M3OE-27HFN8-Q M3OF-27HFN8-Q 59.5 M4OE-28HFN8-Q M4OB-36HFN8-Q M5OD-42HFN8-Q...

  • Page 18: Installation Details

    Installation Details 8.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) 8.2 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 (mm²...

  • Page 19: Installation For The First Time

    ● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K&24K indoor unit), additional transfer connector needs to be used on outdoor unit union. Indoor unit Extension pipe diameter (mm/inch) Model Pipe diameter (mm/inch) Liquid 6.35(1/4) Liquid 6.35(1/4) 7K9K12K...
  • Page 20 (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Close Manifold valve Compound meter Pressure gauge -0.1MPa Handle Lo Handle Hi Charge hose Charge hose Vacuum pump Vacuum pump 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 21 2. Adding the refrigerant if the pipe length >5m 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.

  • Page 22: Adding The Refrigerant After Running The System For Many Years

    8.5 Adding the refrigerant after running the system for many years 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.

  • Page 23: Re-Installation While The Indoor Unit Need To Be Repaired

    8.6 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit 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.
  • Page 24 2. Air purging with vacuum pump (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Close Manifold valve Compound meter Pressure gauge -0.1MPa Handle Lo Handle Hi Charge hose Charge hose Vacuum pump Vacuum pump Procedure: 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 25: Re-Installation While The Outdoor Unit Need To Be Repaired

    8.7 Re-installation while the outdoor unit need to be repaired 1. Evacuation for the whole system 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).
  • Page 26 2. Refrigerant charging 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.

  • Page 27: Electronic Control Function

    Electronic control function 9.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet(This sensor is located in outdoor unit) T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature Ts: Setting temperature 9.2 Electric control working environment.
  • Page 28 9.4 Outdoor unit point check function A check switch is included on the outdoor PCB. Push SW1 to check the unit's status while running. The digital display shows the following codes each time the SW1 is pushed. Display Remark Number Presses Normal display Displays running frequency, running state, or malfunction code...

  • Page 29: Three Minutes Delay At Restart For Compressor

    99 ℃, the digital display shows single and double digits. For example, if the digital display shows “0.5", the compressor discharge temperature is 105 ℃. AD value of current The display value is a hex number. For example, the digital display tube shows “Cd”, it means AD value is AD value of voltage 205.
  • Page 30 V O L T A G E N o li m it V O L T _ L T M _ F R E Q 1 _ A D D V O L T _ L T M _ F R E Q 2 _ A D D Note: if the low voltage protection occurs and not resumes within 3 minutes, it will keep the protection always after restart the machine.
  • Page 31 O f f D e c r e a s e H o ld R e s u m e 9.5.7 Outdoor unit anti-freezing protection When T2<4℃ for 250 seconds or T2<0℃, the indoor unit capacity demand will be zero and resume to normal when T2>8℃...

  • Page 32: Troubleshooting

    10. Troubleshooting Indoor unit error code explanation: 10.1 For Aurora type ,All Easy type, Four-way cassette type (compact): Operation Lamp Malfunction Timer Lamp Error Code (flashes) Indoor EEPROM malfunction Communication malfunction between indoor and outdoor units Indoor fan speed has been out of control Open or short circuit of T1 temperature sensor Open or short circuit of T2 temperature sensor Water level alarm...
  • Page 33 For Mission2 type and Ultimate Comfort type: Malfunction Error Code Indoor unit EEPROM parameter error E0/EA Indoor / outdoor units communication error Indoor fan speed is operating outside of the normal range Indoor room temperature sensor T1 open circuit or short circuit Evaporator coil temperature sensor T2 open circuit or short circuit Communication error between the indoor PCB and display board Overload current protection...
  • Page 34 Outdoor unit error code explanation: 10.2 Display LED STATUS Outdoor EEPROM malfunction Indoor / outdoor units communication error Communication malfunction between IPM board and outdoor main board Open or short circuit of outdoor unit temperature sensor(T3,T4.T5) Voltage protection PFC module protection Outdoor fan speed has been out of control No A Indoor unit coil outlet temperature sensor or connector of sensor is defective No B Indoor unit coil outlet temperature sensor or connector of sensor is defective...
  • Page 35 Trouble shooting 10.3 10.3.1 For the indoor unit 10.3.1.1 Indoor EEPROM malfunction Power off, then restart the unit 2 minutes later Replace the indoor main PCB EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 36 10.3.1.2 Indoor / outdoor units communication error 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.
  • Page 37 Pic 1: check the voltage of N to S (Vs), is it moving alternately between positive value and negative value? Pic 2:IPM or outdoor main PCB Operating Self-Check Pic 2: IPM or outdoor main PCB Power, Self-Check Operating...
  • Page 38 PIC3 :Main board LED when power on and unit standby. PIC 4: check point button, Press 1 time for check how many indoor units are connected...
  • Page 39 10.3.1.3 Indoor fan speed has been out of control Power off, then restart the Power off, then restart the unit 2 minutes later. Is it still The unit operates normally. unit 2 minutes later. Is it still The unit operates normally. displaying the error code? displaying the error code? Find out the cause and...
  • Page 40 DC motor voltage input and output For split type: Color Signal Voltage Vs/Vm 280V~380V Black White 14-17.5V Yellow 0~5.6V Blue 14-17.5V For other types: Color Signal Voltage Vs/Vm 192V~380V Black White 13.5-16.5V Yellow 0~6.5V Blue 13.5-16.5V...
  • Page 41 10.3.1.4 Open or short circuit of temperature sensor. Check the connections Check the connections between temperature between temperature Correct the connections. Correct the connections. sensor and PCB. Are the sensor and PCB. Are the connections good? connections good? Measure the resistance value Measure the resistance value of the sensor via Appendix 1 of the sensor via Appendix 1...
  • Page 42 10.3.1.6 E6(PFC module protection) 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 module Replace the outdoor main board is normal? DC277-356V for 18-27KBtu/h;...
  • Page 43 10.3.1.8 Inverter compressor drive malfunction(P4) The trouble shooting is same with IPM module protection. 10.3.3 For the outdoor unit 10.3.3.1 Outdoor EEPROM malfunction(ODU E0) Power off, then restart the Power off, then restart the unit 2 minutes later unit 2 minutes later Replace the outdoor main PCB Replace the outdoor main PCB EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and...
  • Page 44 10.3.3.2 Communication malfunction between IPM board and outdoor main board(ODU E3) E3 display Communication malfunction between IPM board and outdoor main board Is there at least one LED in the IPM board light? Check the signal wire between the IPM board and the main board, is it connected good? Reconnect and retry.
  • Page 45 10.3.3.3 Voltage protection(ODU E5) 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 220~240VAC Check whether the voltage of IPM board P and N is normal? DC277-356V for 18-27KBtu/h;...
  • Page 46 10.3.3.4 Outdoor fan speed has been out of control (E8) Power off, then restart the Power off, then restart the unit 2 minutes later. Is it still The unit operates normally. unit 2 minutes later. Is it still The unit operates normally. displaying the error code? displaying the error code? Find out the cause and...
  • Page 47 10.3.3.5 High pressure protection (ODU P1)(For M4OB-36HFN8-Q, M5OD-42HFN8-Q) 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...
  • Page 48 10.3.3.6 Low pressure protection (ODU P2) (For M4OB-36HFN8-Q, M5OD-42HFN8-Q) 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...
  • Page 49 10.3.3.7 Current protection of compressor (ODU P3) Current protection of compressor Judge 1: Check whether the input current of the power supply wire is higher than max protection current value Check whether the refrigerant system is ok Judge 2: Check whether the outdoor ambient Stop the unit temperature is higher than...
  • Page 50 10.3.3.8 Temperature protection of compressor discharge (ODU P4) 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...
  • Page 51 10.3.3.9 High temperature protection of condenser (ODU P5) When outdoor pipe temperature is more than 65° C, the unit will stop, and unit runs again when outdoor pipe temperature less than 52° C. Check the connection Check the connection between temperature Correct the connection between temperature Correct the connection...
  • Page 52 10.3.3.10 IPM module protection (ODU P6) 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 18-28KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36-42KBtu/h...
  • Page 53 10.3.3.11 The cooling operation or heating operation does not operate. Potential causes ● Faulty 4-way valve Check of 4-way, please refer to part 4 in 10.4 Trouble Criterion Of Main Parts. 10.3.3.12 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 54 10.4 Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temperature(T1) sensor, Indoor coil temperature(T2) sensor, Outdoor coil temperature(T3) sensor, Outdoor ambient temperature(T4) sensor, Compressor discharge temperature(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 55 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4,T2B (℃--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...
  • Page 56 Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K) ℃ K Ohm ℃ K Ohm ℃ K Ohm ℃ K Ohm 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...
  • Page 57 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value KSM135D23UFZ KTF235D22UMT KTF310D43UMT Blue - Red 1.72Ω(20℃) 0.75Ω(20℃) 0.65Ω(20℃)
  • Page 58 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. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red...
  • Page 59 5.EXV check Disconnect the connectors. Red Brown Blue Orange Yellow White Resistance to EXV coil Color of lead wire Normal Value Red- Blue About 50Ω Red - Yellow Brown-Orange...

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