Midea M2OD-16HFN1-Q Service Manual
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Midea M2OD-16HFN1-Q Service Manual

Super dc inverter multi type
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Библиотека СОК 
Библиотека СОК 
SERVICE MANUAL
MIDEA SUPER DC INVERTER MULTI TYPE
DC MULTI OUTDOOR UNITS
M2OD-16HFN1-Q
M2OD-18HFN1-Q
M3OD-21HFN1-Q
M3OD-26HFN1-Q
M4OD-28HFN1-Q
M4OA-36HFN1-Q
M5OC-36HFN1-Q
M5OD-42HFN1-Q
DM15-01.01.11-01en

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  • Page 1 Библиотека СОК  Библиотека СОК  DM15-01.01.11-01en SERVICE MANUAL MIDEA SUPER DC INVERTER MULTI TYPE DC MULTI OUTDOOR UNITS M2OD-16HFN1-Q M2OD-18HFN1-Q M3OD-21HFN1-Q M3OD-26HFN1-Q M4OD-28HFN1-Q M4OA-36HFN1-Q M5OC-36HFN1-Q M5OD-42HFN1-Q...

  • Page 2: Table Of Contents

    Service manual DM15-01.01.11-01en CONTENTS 1. GENERAL INFORMATION OF OUTDOOR UNITS ......... 3 2. FEATURES ....................4 3. SPECIFICATION ..................5 4. DIMENSIONS ..................17 5. WIRING DIAGRAM ................22 6. REFRIGERATION CYCLE DIAGRAM ........... 25 7. INDOOR UNITS COMBINATION ............28 8.

  • Page 3: General Information Of Outdoor Units

    DM15-01.01.11-01en Service manual       General information of Outdoor Units Model name Dimension (mm) M2OD-18HFN1-Q 810x310x558 M2OD-18HFN1-Q 845x320x700 M3OD-21HFN1-Q 845x320x700 M3OD-26HFN1-Q 845x320x700 M4OD-28HFN1-Q 900x315x860 M4OA-36HFN1-Q 990x345x965 M5OC-36HFN1-Q 990x345x965 M5OD-42HFN1-Q 990x345x965 Multi DC inverter R410A. Outdoor unit...

  • Page 4: Features

    Service manual DM15-01.01.11-01en 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: Specification

    DM15-01.01.11-01en Service manual       Specification Outdoor Model M2OD-16HFN1-Q M2OD-18HFN1-Q Power supply V-ph-Hz 220-240V- 50Hz, 1Ph 220-240V- 50Hz, 1Ph Single Double Single Double Capacity 1,47-3,52 4,81 2,05-4,69 5,28 Input 1480 1650 Cooling Rated current 7,55 3,24 Capacity 1,76-3,81 4,75...
  • Page 6 Service manual DM15-01.01.11-01en OU higher Max. height difference than IU between indoor and OU lower outdoor unit than IU Max. height difference between indoor units Cooling -15-50 -15-50 ℃ Ambient temperature Heating -15-24 -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.
  • Page 7 DM15-01.01.11-01en Service manual       Outdoor Model M3OD-21HFN1-Q M3OD-26HFN1-Q Power supply V-ph-Hz 220-240V- 50Hz, 1Ph 220-240V- 50Hz, 1Ph Single Double Three Single Double Three Capacity 2,05-3,52 4,10-5,28 6,45 2,05-3,52 4,10-5,28 7,62 Input 1000-1300 1500-1780 1970 2370 Cooling Rated current 4.4-5.7 6.5-7.7 8,83...
  • Page 8 Service manual DM15-01.01.11-01en Max. height higher difference than IU between indoor and outdoor unit lower than IU Max. height difference between indoor units Cooling -15-50 -15-50 ℃ Ambient temperature Heating -15-24 -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.
  • Page 9 DM15-01.01.11-01en Service manual       Outdoor Model M4OD-28HFN1-Q Power supply V-ph-Hz 220-240V- 50Hz, 1Ph Single Double Three FOUR Capacity 1,47-4,40 352-6,16 5,28-7,03 8,21 Input 1334-1784 1730-2403 2234-2777 2470 Cooling Rated current 5.8-7.8 7.5-10.7 9.7-12.1 11.2 3.32 Capacity 1,47-4,40 3,52-6,16 5,28-7,91 9,09 Input...
  • Page 10 Service manual DM15-01.01.11-01en OU higher Max. height difference than IU between indoor and OU lower than outdoor unit Max. height difference between indoor units Cooling -15-50 ℃ Ambient temperature Heating -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.
  • Page 11 DM15-01.01.11-01en Service manual       Outdoor Model M4OA-36HFN1-Q Power supply V-ph-Hz 220-240V- 50Hz, 1Ph Single Double Three FOUR Capacity 2,05-5,28 4,10-7,62 6,16-10,55 10,55 Input 1250-1700 1650-2320 2150-3520 3280 Cooling Rated current 5.4-7.4 7.2-10.1 9.3-15.3 14.3 3.22 Capacity 2,34-5,86 4,68-8,50 7,03-11,72 12,02 Input...
  • Page 12 Service manual DM15-01.01.11-01en OU higher Max. height difference than IU between indoor and OU lower than outdoor unit Max. height difference between indoor units Cooling -15-50 ℃ Ambient temperature Heating -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.
  • Page 13 DM15-01.01.11-01en Service manual       Outdoor Model M5OC-36HFN1-Q Power supply V-ph-Hz 220-240V- 50Hz, 1Ph FIVE Single Double Three FOUR Capacity 10,55 2,05-5,28 4,10-7,33 6,15-8,79 8,21-10,55 Input 1330-1780 3280 Cooling Rated current 5.8-7.8 14,6 3.22 Capacity 12,31 2,05-5,28 4,10-7,62 6,15-9,38 8,21-11,72 Input 1650-2500...
  • Page 14 Service manual DM15-01.01.11-01en OU higher Max. height difference than IU between indoor and OU lower outdoor unit than IU Max. height difference between indoor units Cooling -15-50 ℃ Ambient temperature Heating -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.
  • Page 15 DM15-01.01.11-01en Service manual       Outdoor Model M50D-42HFN1-Q Power supply V-ph-Hz Single Double Three FOUR FIVE 220-240V- 50Hz, 1Ph Capacity 12,31 2,05-5,28 4,10-8,21 6,15-10,55 8,21-11,72 Input 680-1800 1400-2780 2100-3450 2700-3700 3830 Cooling Rated current 3.0-8.0 6.2-11.8 9.0-15.0 11.6-16.0 17,5 3,21 Capacity 12,31...
  • Page 16 Service manual DM15-01.01.11-01en OU higher Max. height difference between than IU indoor and outdoor OU lower unit than IU Max. height difference between indoor units Cooling -15-50 ℃ Ambient temperature Heating -15-24 ℃ Remarks: 1.The above design and specifications are subject to change without prior notice for product improvement.

  • Page 17: Dimensions

    DM15-01.01.11-01en Service manual       Dimensions M2OD-18HFN1-Q 810 W3 549 W1 D1 325 795 W D2 348 104.2 66.6 61.6 25.4 R7.7 Multi DC inverter R410A. Outdoor unit...
  • Page 18 Service manual DM15-01.01.11-01en M3OD-21HFN1-Q, M3OD-26HFN1-Q 200.7 D1 335 560 W1 D2 360 845 W Multi DC inverter R410A. Outdoor unit...
  • Page 19 DM15-01.01.11-01en Service manual       M4OD-28HFN1-Q 238.4 590 W1 D1 333 900 W D2 355 Multi DC inverter R410A. Outdoor unit...
  • Page 20 Service manual DM15-01.01.11-01en M4OA-36HFN1-Q D1 366 624 W1 D2 397 990 W Multi DC inverter R410A. Outdoor unit...
  • Page 21 DM15-01.01.11-01en Service manual       M5OC-36HFN1-Q, M5OD-42HFN1-Q D1 366 624 W1 990 W D2 397 W2 81 B1 145 Multi DC inverter R410A. Outdoor unit...

  • Page 22: Wiring Diagram

    Service manual DM15-01.01.11-01en Wiring Diagram M2OD-18HFN1-Q Multi DC inverter R410A. Outdoor unit...
  • Page 23 DM15-01.01.11-01en Service manual       M3OD-21HFN1-Q, M3OD-26HFN1-Q M4OD-28HFN1-Q Multi DC inverter R410A. Outdoor unit...
  • Page 24 Service manual DM15-01.01.11-01en M4OA-36HFN1-Q M5OC-36HFN1-Q, M5OD-42HFN1-Q Multi DC inverter R410A. Outdoor unit...

  • Page 25: Refrigeration Cycle Diagram

    DM15-01.01.11-01en Service manual       Refrigeration Cycle Diagram 6.1 Refrigeration circuit drawing of inverter 1 drive 2 type INDOOR OUTDOOR EXV A CAPILIARY A LIQUID VALVE A CHECK VALVE EXV B CAPILIARY B LIQUID VALVE B Condenser temp. sensor CAPILIARY TUBE HEAT HEAT...
  • Page 26 Service manual DM15-01.01.11-01en 5.3 Refrigeration circuit drawing of inverter 1 drive 4 type INDOOR OUTDOOR EXV A CAPILIARY A LIQUID VALVE A EXV B CAPILIARY B LIQUID VALVE B CHECK VALVE EXV C CAPILIARY C LIQUID VALVE C Condenser temp. sensor EXV D CAPILIARY D CAPILIARY TUBE LIQUID VALVE D...
  • Page 27 DM15-01.01.11-01en Service manual       5.5 Refrigeration circuit drawing of M5OD-42HFN1-Q INDOOR OUTDOOR EXV A CAPILIARY A LIQUID VALVE A EXV B CAPILIARY B LIQUID VALVE B EXV C CAPILIARY C CHECK VALVE LIQUID VALVE C EXV D CAPILIARY D LIQUID VALVE D Condenser temp.

  • Page 28: Indoor Units Combination

    Service manual DM15-01.01.11-01en Indoor units combination Indoor unit combination for M2OD-18HFN1-Q One unit Two unit 7  7+7  9+9  9  7+9  9+12  12  7+12  9+18  18  7+18  12+12  Indoor unit combination for M3OD-21HFN1-Q, M3OD-26HFN1-Q One unit Two unit Three unit 7  7+7 ...
  • Page 29 DM15-01.01.11-01en Service manual       Indoor unit combination for M5OC-36HFN1-Q One Unit Two Unit Three Unit 7+7  9+12  7+7+7  7+9+18  9+9+18  12+18+18  7+9  9+18  7+7+9  7+12+12  9+12+12  18+18+18  7+12  12+12  7+7+12  7+12+18  9+12+18    7+18  12+18  7+7+18  7+18+18  9+18+18   ...
  • Page 30 Service manual DM15-01.01.11-01en Indoor unit combination for M5OD-42HFN1-Q One Unit Two Unit Three Unit 7  7+7  9+9  7+7+7  7+9+24  9+9+24  12+18+18  9  7+9  9+12  7+7+9  7+12+12  9+12+12  18+18+18  12  7+12  9+18  7+7+12  7+12+18  9+12+18    18  7+18  9+24  7+7+18  7+12+24  9+12+24 ...

  • Page 31: Sound Levels

    DM15-01.01.11-01en Service manual       Sound Levels Outdoor Unit Microphone 1.0m Note: H= 0.5 × height of outdoor unit Model Noise Power dB(A) Noise level dB(A) M2OD-18HFN1-Q(W190) M3OD-21HFN1-Q M3OD-26HFN1-Q M4OD-28HFN1-Q M4OA-36HFN1-Q M5OC-36HFN1-Q M5OD-42HFN1-Q Multi DC inverter R410A. Outdoor unit...

  • Page 32: Installation Details

    Service manual DM15-01.01.11-01en Installation Details 9.1 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) 9.2 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) >3 and ≤6...
  • Page 33 DM15-01.01.11-01en Service manual       ● Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension pipe, refer to the tables below. ● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional transfer connector needs to be used on outdoor unit union.
  • Page 34 Service manual DM15-01.01.11-01en 1. 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 1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way...
  • Page 35 DM15-01.01.11-01en Service manual       2. Air purging by refrigerant Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the closed position. 2). Connect the charge set and a charging cylinder to the service port of the 3-way valve. 3).
  • Page 36 Service manual DM15-01.01.11-01en 3. 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 37 DM15-01.01.11-01en Service manual       9.5 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 38 Service manual DM15-01.01.11-01en 9.6 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 39 DM15-01.01.11-01en Service manual       2. Air purging by the refrigerant Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the closed position. 2). Connect the charge set and a charging cylinder to the service port of the 3-way valve Leave the valve on the charging cylinder closed.
  • Page 40 Service manual DM15-01.01.11-01en 9.7 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 41 DM15-01.01.11-01en Service manual       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 42 Service manual DM15-01.01.11-01en For M5OD-42HFN1-Q.There are one low-pressure centralized valve and one high-pressure centralized valve, it will be more time saving when vacumm and recycle refrigerant. But refer to the previous instruction when vacumm and recycle refrigerant. Multi DC inverter R410A. Outdoor unit...

  • Page 43: Electronic Control Function

    DM15-01.01.11-01en Service manual       Electronic control function 10.1 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 temperature 10.2 Electric control working environment.
  • Page 44 Service manual DM15-01.01.11-01en 10.4 Outdoor unit point check function There is a check switch in outdoor PCB. Press the switch N times it will display the content corresponding to No. N. After getting into the check function, it will display No. N with 1.5s, meanwhile the low bit decimal of digit display flashing, indicated to get into the check function display.
  • Page 45 DM15-01.01.11-01en Service manual       AD value of voltage For example ,the digital display tube show “Cd”, it means AD value is 205. EXV open angle for A indoor unit Actual data/4. EXV open angle for B indoor unit If the value is higher than 99, the digital display tube will show single EXV open angle for C indoor unit digit and tens digit.
  • Page 46 Service manual DM15-01.01.11-01en Capacity area Norm value (N) Heating mode T1 Ts Capacity area Norm value (N) 10.4.4 Number of indoor unit Display Number of indoor unit 10.4.5 Opening degree of electronic expansion valve: Actual opening degree equals the display data times 4 Multi DC inverter R410A.
  • Page 47 DM15-01.01.11-01en Service manual       10.5 Protection 10.5.1 Three minutes delay at restart for compressor. 10.5.2 Temperature protection of compressor discharge. When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules: ----If 102 <T5<115 , decrease the frequency to the lower level every 2 minutes till to F1. ---If T5>115 for 10 seconds, the compressor will stop and restart till T5<90 .
  • Page 48 For other models: When T2B<0 for 250 seconds, the indoor unit capacity demand will be zero and resume to normal when T2B>10 . For M2OD-16HFN1-Q，M2OD-18HFN1-Q，M5OD-42HFN1-Q: When T2<4℃ for 250 seconds or T2<0℃, the indoor unit capacity demand will be zero and resume to normal when T2>8℃ and the time of protection is no less than 3 minutes.

  • Page 49: 11. Troubleshooting

    DM15-01.01.11-01en Service manual       11. Troubleshooting Indoor unit error code explanation: 11.1 OASIS series: Display Operation lamp flash times Timer lamp Failure Indoor EEPROM malfunction Indoor / outdoor units communication error Indoor fan speed has been out of control Open or short circuit of T1 temperature sensor Open or short circuit of T2 temperature sensor Open or short circuit of T4 temperature sensor...
  • Page 50 Service manual DM15-01.01.11-01en Outdoor unit error code explanation: 11.2 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 Voltage 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 51 DM15-01.01.11-01en Service manual       11.3 Trouble shooting 11.3.1 For the indoor unit 11.3.1.1 Indoor EEPROM malfunction EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. Multi DC inverter R410A. Outdoor unit...
  • Page 52 Service manual DM15-01.01.11-01en 11.3.1.2 Indoor / outdoor units communication error Multi DC inverter R410A. Outdoor unit...
  • Page 53 DM15-01.01.11-01en Service manual       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 (For M4OD-28HFN1-Q/tri-zone) Operating Self-Check Pic 2: IPM or outdoor main PCB (For M2OD-18HFN1-Q/M4OA-36HFN1-Q/ qui-zone) Power,...
  • Page 54 Service manual DM15-01.01.11-01en 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 Multi DC inverter R410A. Outdoor unit...
  • Page 55 DM15-01.01.11-01en Service manual       11.3.1.3 indoor unit fan speed has been out of control 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.
  • Page 56 Service manual DM15-01.01.11-01en 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 Multi DC inverter R410A. Outdoor unit...
  • Page 57 DM15-01.01.11-01en Service manual       11.3.1.4 Open or short circuit of temperature sensor. Check the connections  between temperature  Correct the connections. sensor and PCB. Are the  connections good? Measure the resistance value  of the sensor via Appendix 1 Is it normal? Replace the sensor. Replace the indoor PCB  11.3.1.6 Full-water malfunction Multi DC inverter R410A. Outdoor unit...
  • Page 58 Service manual DM15-01.01.11-01en 11.3.2 For the outdoor unit 11.3.2 1 Outdoor EEPROM malfunction(ODU E0) EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage. Multi DC inverter R410A. Outdoor unit...
  • Page 59 DM15-01.01.11-01en Service manual       11.3.2.2 Communication malfunction between IPM board and outdoor main board(ODU E3) Multi DC inverter R410A. Outdoor unit...
  • Page 60 Service manual DM15-01.01.11-01en 11.3.2.3 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 61 DM15-01.01.11-01en Service manual       11.3.2.4 Outdoor unit fan speed has been out of control (E8) Index 1: 1. Outdoor 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.
  • Page 62 Service manual DM15-01.01.11-01en 11.3.2.5 High pressure protection (ODU P1) (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q) Multi DC inverter R410A. Outdoor unit...
  • Page 63 DM15-01.01.11-01en Service manual       11.3.2.6 Low pressure protection (ODU P2) (For M4OA-36HFN1-Q, M4OD-28HFN1-Q, M5OC-36HFN1-Q, M5OD-42HFN1-Q) Low pressure protection Whether the wiring between the low pressure protector and main control Connect it well board is connected well or correctly Whether the low pressure protector is broken Method: Disconnect the plug.
  • Page 64 Service manual DM15-01.01.11-01en 11.3.2.7 Current protection of compressor (ODU P3) M2OD-18HFN1- M3OD-21HFN1- M3OD-26HFN1- M4OD-28HFN1- M4OA-36HFN1- M5OC-36HFN1- M5OD-42HFN1- Model protectio n current Multi DC inverter R410A. Outdoor unit...
  • Page 65 DM15-01.01.11-01en Service manual       11.3.2.8 Temperature protection of compressor discharge (ODU P4) Temperature protection of  compressor discharge Check whether the  Check whether the  compressor discharge temp. is  Stop leaking and add refrigerant refrigerant is leak more than 115°C ? Check whether connection is right between compressor discharge temp. Correct the wiring connection sensor and PCB according to wiring diagrams? Measure the resistance value compressor discharge temp.
  • Page 66 Service manual DM15-01.01.11-01en 11.3.2.9 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  between temperature  Correct the connection High temperature protection of  sensor and PCB. condenser Check whether the condenser temperature is Check whether the...
  • Page 67 DM15-01.01.11-01en Service manual       11.3.2.10 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 18-27KBtu/h;  208-230V, 1N, 60Hz can work normally? DC277-410V for 36-42KBtu/h Check whether the connecting  line between main board and  Connect it tightly,  the IPM module is connected  check ok or not? Check whether the  Connect it correctly  tightly power supply line is  and tightly, check ok  connected correctly and  or not? tightly Check whether the connecting  Connect it well, check  line of the compressor is  ok or not? Check whether the lines ...
  • Page 68 Service manual DM15-01.01.11-01en 11.4 Main parts check 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.
  • Page 69 DM15-01.01.11-01en Service manual       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...
  • Page 70 Service manual DM15-01.01.11-01en 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 11.38...
  • Page 71 DM15-01.01.11-01en Service manual       2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value DA130M1C-31FZ DA150S1C-20FZ DA250S2C-30MT TNB306FPGMC-L ASN108D22UEZ MNB36FAAMC-L Blue - 1.77Ω(20℃) 0.95Ω(20℃) 0.55Ω(20℃) 0.53Ω(20℃) 1.57Ω(20℃) 0.44Ω(20℃) Multi DC inverter R410A. Outdoor unit...
  • Page 72 Service manual DM15-01.01.11-01en 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...

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