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Midea M2OC-14HRDN1 Technical & Service Manual
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Midea M2OC-14HRDN1 Technical & Service Manual

R410a multi dc inverter
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GD Midea Refrigeration Equipment Co.,Ltd
MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS
Outdoor units Models
Technical service manual
R410A Multi DC inverter
220~240V-1Ph-50Hz
M2OC-14HRDN1
M2OC-14HRDN1-Q
M2OC-18HRDN1
M2OC1-18HRDN1-Q
M3OC1-21HRDN1-Q
M3OC-27HRDN1
M3OC1-27HRDN1-Q
M4OC-24HRDN1-Q
M4OC1-27HRDN1-Q
M4OC-27HRDN1
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q
ODMI-A-1202

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Summary of Contents for Midea M2OC-14HRDN1

  • Page 1 ODMI-A-1202 GD Midea Refrigeration Equipment Co.,Ltd MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS Technical service manual R410A Multi DC inverter 220~240V-1Ph-50Hz Outdoor units Models M2OC-14HRDN1 M2OC-14HRDN1-Q M2OC-18HRDN1 M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN1 M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC1-27HRDN1-Q M4OC-27HRDN1 M4OC-36HRDN1-Q M5OA-36HRDN1-Q...

  • Page 2: Table Of Contents

    CONTENTS 1. General information of Outdoor Units ........3 2. Features .................. 4 3. Dimensions ................5 4. Wiring Diagram ............... 6 5. Refrigeration Cycle Diagram ..........11 6. Indoor units combination ............. 13 7. Electronic control function ..........15 8.

  • Page 3: General Information Of Outdoor Units

    1. General information of Outdoor Units Model name Dimension (mm) Net/Gross weight (kg) Compressor M2OC-14HRDN1 760*590*285 39/41 DA108X1C-20FZ3 M2OC-14HRDN1-Q 760*590*285 39/41 DA108X1C-20FZ3 M2OC-18HRDN1 845*700*320 57.5/61.5 C-6RVN93H0N M2OC1-18HRDN1-Q 845*700*320 53.5/57 DA130S1C-20FZ M3OC1-21HRDN1-Q 845*700*320 55/60 DA130S1C-20FZ M3OC-27HRDN1 845*700*320 59/62 C-6RZ146H1A M3OC1-27HRDN1-Q 845*700*320 57/60.5...

  • Page 4: Features

    2. 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

    3. Dimensions More than 30cm More than 60cm (Service space More than 30cm More than 60cm More than 70cm MODEL M2OC-14HRDN1-Q M2OC-14HRDN1 M2OC-18HRDN1 M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN1 M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC-27HRDN1 M4OC1-27HRDN1-Q M4OC-36HRDN1-Q 1075 M5OA-36HRDN1-Q...

  • Page 6: Wiring Diagram

    4. Wiring Diagram 4.1 M2OC-14HRDN1-Q 4.2 M2OC-14HRDN1...
  • Page 7 4.3 M2OC1-18HRDN1-Q 4.4 M3OC1-21HRDN1-Q M3OC1-27HRDN1-Q M3OC-27HRDN1...
  • Page 8 4.5 M2OC-18HRDN1 4.6 M4OC-24HRDN1-Q...
  • Page 9 4.7 M4OC1-27HRDN1-Q、M4OC-27HRDN1 4.8 M4OC-36HRDN1-Q...
  • Page 10 4.9 M5OA-36HRDN1-Q...

  • Page 11: Refrigeration Cycle Diagram

    5. Refrigeration Cycle Diagram 5.1 Refrigeration circuit drawing of inverter binary type 4.2 Refrigeration circuit drawing of inverter trinary type 5.3 Refrigeration circuit drawing of inverter quadplex type...
  • Page 12 5.4 Refrigeration circuit drawing of inverter quintuple type...

  • Page 13: Indoor Units Combination

    6. Indoor units combination Indoor unit combination for M2OC-14HRDN1-Q、M2OC-14HRDN1 One unit Two unit 9+12 7+12 Note: There should be no more than one cassette or duct or console or ceiling & floor unit. Indoor unit combination for M2OC1-18HRDN1-Q、M2OC-18HRDN1 One unit...
  • Page 14 6.6 Indoor unit combination for M4OC1-27HRDN1-Q、M4OC-27HRDN1 One unit Two unit Three unit Four unit 12+12 7+7+7 7+9+12 9+9+9 7+7+7+7 7+7+9+9 7+9+9+12 9+12 12+18 7+7+9 7+9+18 9+9+12 7+7+7+9 7+7+9+12 7+9+12+12 7+12 9+18 18+18 7+7+12 7+12+12 9+9+18 7+7+7+12 7+7+12+12 9+9+9+9 7+18 7+7+18 7+12+18 9+12+12 7+7+7+18...

  • Page 15: Electronic Control Function

    Electronic control function 7.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet. T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature Ts: Setting temp.
  • Page 16 EXV open angle for 1# indoor unit Actual data/8 EXV open angle for 2# indoor unit Actual data/8 EXV open angle for 3# indoor unit Actual data/8 EXV open angle for 4# indoor unit Actual data/8 Power supply of outdoor unit AD data Indoor unit number The indoor unit can communicate with outdoor unit well.
  • Page 17 A indoor unit evaporator outlet temp.(T B indoor unit evaporator outlet temp.(T C indoor unit evaporator outlet temp.(T If the temp. is lower than -9 degree, the digital display tube will show “-9”.If the temp. is higher than 70 degree, the digital display D indoor unit evaporator outlet temp.(T tube will show “70”.
  • Page 18 7.4.3 Capacity demand: Cooling mode Capacity 2000-2 2000-2 3000-3 4500-5 5000-5 5500-6 6100-7 7000-7 7500-8 >7500 Correspondi >=10 ng Code Heating mode Capacity 2000-2 2000-2 3000-3 4500-5 5500-6 6100-7 6100-7 7000-7 7500-8 >8000 Correspondin 9-10 >=11 g Code Note: The capacity is just for reference.
  • Page 19 7.4.4Number of indoor unit Display Number of indoor unit 7.4.5 Outdoor ambient temp: Corresponding Corresponding Display Corresponding temp. Display Display temp. temp. -7.5 10.5 25.5 -6.5 11.5 26.5 -5.5 11.5 27.5 -4.5 12.5 28.5 -3.5 13.5 29.5 14.5 -1.5 30.5 15.5 -0.5 31.5...
  • Page 20 VOLREL1 No limit VOLLIMT1 VOLFRE1 VOLREL2 VOLLIMT2 VOLFRE2 VOLREL3 VOLLIMT3 Mode VOLLIMT1(V) VOLLIMT2(V) VOLLIMT3(V) VOLREL1(V) VOLREL2(V) VOLREL3(V) VOLFRE1(Hz) VOLFRE2(Hz) M2OC-14HRDN1 M2OC-14HRDN1-Q M2OC-18HRDN1 M2OC1-18HRDN1-Q M3OC1-21HRDN1-Q M3OC-27HRDN1 M3OC1-27HRDN1-Q M4OC-24HRDN1-Q M4OC-27HRDN1 M4OC1-27HRDN1-Q M4OC-36HRDN1-Q For M5OA-36HRDN1-Q, VOLTAGE No limit VOLT_RST1_ADD VOLT_LTM1_ADD VOLT_LTM_FREQ1_ADD VOLT_RST2_ADD VOLT_LTM2_ADD...
  • Page 21 VOLT_RST1_ADD=210V, VOLT_LIM1_ADD=200V, VOLT_RST2_ADD=195V, VOLT_LIM2_ADD=185V. VOLT_LIM_FREQ1_ADD=54Hz, VOLT_LIM_FREQ2_ADD=42Hz. 7.5.4 Compressor current limit protection If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be limited as below table. For models except M5OA-36HRDN1-Q. Cooling mode: Current frequency(Hz) Current limit value(A) Frequency limit COOL_F10...
  • Page 22 COOL_F9 ICOOLLMT5 COOL_F8 ICOOLLMT4 COOL_F7 ICOOLLMT3 COOL_F6 ICOOLLMT2 COOL_F5 ICOOLLMT1 If the current frequency is lower than COOL_F4, the frequency will not be limited. After 10s of the compressor start, if the current>ICOOL, the AC will display the failure for 30 seconds and stop.
  • Page 23 If the compressor frequency keeps lower than RECOILINFRE for Te minutes, the AC will rise the frequency to RECOILFRE for Tf seconds and then resume to former frequency. For M4OC-36HRDN1-Q, RECOILINFRE=45Hz, RECOILFRE=48Hz,Te=120,Tf=180; For M5OA-36HRDN1-Q, RECOILINFRE=45Hz, RECOILFRE=48Hz, Te=90,Tf=100; For other models, RECOILINFRE=50Hz, RECOILFRE=62Hz, Te=120,Tf=180.

  • Page 24: Troubleshooting

    8. Troubleshooting Indoor unit error code explanation: Glory series MALFUNCTION TIMER AUTO Indoor EEPROM malfunction ★ ★ ★ ★ Indoor / outdoor units communication error Zero-crossing signal error ★ ★ Indoor fan speed has been out of control ★ ★ ★...
  • Page 25 Open or short circuit of T3 temperature sensor Open or short circuit of T5 temperature sensor Outdoor EEPROM malfunction Open or short circuit of T2B temperature sensor ☆ IPM module protection or IGBT over-strong current protection ☆ Over voltage or too low voltage protection ☆...
  • Page 26 A5 Duct series: DISPLAY DIGITAL TUBE Operation Timer De-frost Alarm LED STATUS ★ Open or short circuit of T1 temperature sensor ★ Open or short circuit of T2 temperature sensor ★ Indoor / outdoor units communication error ★ Full-water malfunction ★...
  • Page 27 Outdoor unit error code explanation: For units(except M5OA-36HRDN1-Q model) Display LED STATUS Outdoor EEPROM malfunction No A Indoor unit coil outlet temp. sensor or connector of sensor is defective No B Indoor unit coil outlet temp. sensor or connector of sensor is defective No C Indoor unit coil outlet temp.
  • Page 28 For M5OA-36HRDN1-Q model 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 Compressor voltage protection PFC module protection No A Indoor unit coil outlet temp. sensor or connector of sensor is defective No B Indoor unit coil outlet temp.
  • Page 29 8.3Trouble shooting 8.3.1 For the indoor unit 8.3.1.1 Indoor EEPROM malfunction...
  • Page 30 8.3.1.2 Indoor / outdoor units communication error Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is E1 extinguish? Check wiring on the outdoor and indoor terminal follow Reconnect the wiring the wiring diagram. Is all connecting correctly? Reconnect the wiring Measure Vs, is it moving...
  • Page 31 Pic 1: Measure the voltage of L2 to S (Vs), is it moving alternately between positive value and negative value? PIC 2, Check the wiring. PFC (qua-zone only) PIC 3:IPM (For dual/tri/qua-zone) Off is OK Power on Self-Check OK Operati PIC4 :Main board LED when power on and unit standby.
  • Page 32 8.3.1.3 Zero-crossing signal error 8.3.1.4 Indoor fan speed has been out of control Shut off the power supply and turn it on 1 minute The unit operates normally. later. Is it still displaying the error code? S h u t o f f t h e p o w e r Disassembly the supply, rotate the cross connection between...
  • Page 33 8.3.1.5 Open or short circuit of temperature sensor. 8.3.1.6 Full-water malfunction Full-water malfunction Check whether the water-level switch is inserted well Insert the water-level switch well Check whether the water-level switch is broken Replace the water-level switch Replace the water pump Check whether the water pump is normal Check PCB board or replace the indoor main PCB...
  • Page 34 8.3.2 For the outdoor unit 8.3.2 1 Outdoor EEPROM malfunction Outdoor EEPROM malfunction If the EEPROM chip is welded on PCB, replace the PCB directly. Otherwise, check whether the Insert the EEPROM well EEPROM chip plugged in PCB well? Replace the outdoor main board...
  • Page 35 8.3.2.2 Voltage protection of compressor Voltage protection of compressor Check the voltage of outdoor unit power supply, whether the voltage Check the power supply between L(1) and N is about 220VAC Replace the power board, then check whether the system can run Trouble is solved normally Check whether the voltage of IPM board P and N is 280-400VDC...
  • Page 36 8.3.2.3 Communication malfunction between IPM board and outdoor main board Replace IPM board Check whether the IPM board has error display Trouble is solved Insert the connecting wiring between the IPM module and the main board well over again Trouble is solved Replace the IPM board Replace outdoor PCB Trouble is solved...
  • Page 37 8.3.2.4 Temperature protection of compressor discharge Discharge temperature protection of compressor Check whether the compressor discharge temp. is more than 115°C ? Check whether the wiring connection is right between compressor discharge temp. sensor and Correct the wiring connection PCB according to wiring diagrams Check whether the refrigerant is leak Judge: The discharge temp.
  • Page 38 8.3.2.5 Temperature protection of compressor top Temperature protection of compressor top Judge 1: Whether compressor operates? Whether Reconnect retest. connection is good? Judge 2: Whether refrigerant circulation volume is Whether protector is Replace the protector. normal? normal? Method: Charge refrigerant Check the outdoor Replace the outdoor main PCB.
  • Page 39 8.3.2.6 High pressure protection(For M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q) High pressure protection Judge 1: Whether the wiring between the high pressure switch and main Connect it well control board is connected well or correctly Judge 2: Whether the high pressure switch is broken Method: Short connect the high pressure switch socket, check Replace high pressure switch whether the system can run normally...
  • Page 40 8.3.2.7 Low pressure protection (For M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q, M5OA-36HRDN1-Q) Low pressure protection Judge 1: The wiring between the low pressure switch and main control board is connected well or correctly Connect it well Judge 2: Whether the low pressure switch is broken Method: Short connect the low pressure switch socket, check Replace low pressure switch whether the system can run normally...
  • Page 41 8.3.2.8 Current protection of compressor Current protection of compressor Judge 1: Check whether the input current of the power supply wire is more than 8.5A (For 18-21K, it is 15A..For 27K(1x3) , it is 15A .For 27K(1x4), it is 18.5A , For 36K, it is 21.5A) Check whether the refrigerant system is ok Judge 2: Check whether the outdoor ambient temperature is too high Stop the unit...
  • Page 42 8.3.2.9 IPM module protection IPM module protection Regulate it to correct, Check whether the voltage range of P-N on then check whether the Check whether the input power supply IPM module is normal? DC277-356V for system can work is correct? 220-240V, 1N, 50Hz 14-27KBtu/h;...
  • Page 43 8.3.2.10 High temperature protection of condenser When outdoor pipe temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe temp. less than 52°C. High temperature protection of condenser Check whether the condenser temperature is more than 65°C Check whether the resistance of condenser temp.
  • Page 44 8.3.2.11 PFC module protection PFC module protection Check whether the connecting line between main board and the PFC module is connected tightly Connect it tightly, check normal or not Check whether the voltage between P Replace the outdoor main board and N of IPM module is 380-390VDC Check whether the inductance of PFC module is Replace the inductance...
  • Page 45 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 46 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 47 Appendix 3 1. Reference voltage data: Rectifier : Input :220-230V(AC), output :310V(DC) Inverter module: U,V, W 3ph. Result 60-150V(AC) 60-150V(AC) 60-150V(AC) DC 310V 2. Check the Diode Bridge component ( In wiring diagram, rectifier) Remark: If this part is abnormal, the LED will not light. Multi-meter Result Forward Resistance...

This manual is also suitable for:

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