Pioneer YN020GMFI22M2D Service Manual
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Pioneer YN020GMFI22M2D Service Manual

Pioneer YN020GMFI22M2D Service Manual

Multi split system outdoor units/two, three, four and five zones
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DC INVERTER MULTI ZONE OUTDOOR UNITS
Revision A:           ODMI‐E‐1610‐PDB56/2017 
Model Numbers: 
YN020GMFI22M2D   
YN030GMFI22M3D   
YN040GMFI22M4D   
YN050GMFI22M5D   

Table of Contents

1.
2.
Suggested Indoor Unit Model Numbers
3.
Dimension Of Outdoor Unit
4.
5.
6.
7.
8.
Trouble Shooting
9.
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 as well as irreversible
equipment damage.
Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property
damage, personal injury and/or death.
COPYRIGHT 2016, Parker Davis HVAC International Inc. All rights reserved. This document cannot be wholly or
partially copied, published or distributed without the written authorization from Parker Davis HVAC International, Inc.
MULTI SPLIT SYSTEM OUTDOOR UNITS
SERVICE MANUAL                   
Two, Three, Four and Five Zones
Dual (2 Zones) 
Triple (3 Zones)  
Quad (4 Zones) 
Quint (5 Zones) 
Multi zone

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Summary of Contents for Pioneer YN020GMFI22M2D

  • Page 1 MULTI SPLIT SYSTEM OUTDOOR UNITS Multi zone SERVICE MANUAL                    Two, Three, Four and Five Zones DC INVERTER MULTI ZONE OUTDOOR UNITS Revision A:           ODMI‐E‐1610‐PDB56/2017  Model Numbers:  YN020GMFI22M2D    Dual (2 Zones)  YN030GMFI22M3D    Triple (3 Zones)   YN040GMFI22M4D    Quad (4 Zones)  YN050GMFI22M5D    Quint (5 Zones)  Table of Contents Indoor Unit Combination Table...

  • Page 2: Table Of Contents

    CONTENTS Indoor Unit Combination  ............................ 3  Dimension Of Outdoor Unit............................ 4  Refrigerant Cycle Diagram  ............................ 5  Installation Details .............................. 7  5.1 Wrench torque sheet for installation ......................... 7  5.2 Connecting the cables ............................ 7  5.3 Pipe length and the elevation  .......................... 7  5.4 Installation for the first time .......................... 8  5.5 Adding the refrigerant after running the system for many years .............. 12  5.6 Procedure when servicing the indoor unit refrigeration circuit.  .............. 14  5.7 Evacuation after servicing the outdoor unit refrigeration circuit .............. 14  Electronic Function .............................. 15  6.1 Abbreviation .............................. 15  6.2 Electric control working environment.  ...................... 15  6.3 Main Protection  .............................. 15  6.4 Control and Functions ............................ 17  Wiring Diagrams .............................. 20  Troubleshooting .............................. 24  8.1Safety  ................................. 24  8.2  I ndoor Unit Error Display........................... 25  8.3 Outdoor Unit Display ............................ 30  8.4 Diagnosis and Solution ............................. 33  8.5 Trouble Criterion Of Main Parts. ........................ 74  9.

  • Page 3: Indoor Unit Combination

    1. Indoor Unit Combination Min~Max Multi DC Suggested (Nominal) Limit Outdoor Unit Combination Capacity Min~Max Multi DC Suggested (Nominal) Limit Outdoor Unit Combination 18+18 Capacity 18+24 24+24 12,000~24,000 TWO Zone (18,000) None 9+9+18 9+12 BTU/h 9+9+24 12+12 9+12+12 9+12+18 Min~Max 9+12+24 Multi DC Suggested...
  • Page 4 2. Dimension of the Outdoor Units Model  Unit：  W  D  H  W1  A  B  845  363  702  923  540  350  YN020GMFI22M2D  33.3 14.3 27.6 36.0 21.3 13.8 inch 946  410  810  1034  673  403  YN030GMFI22M3D  inch 37.2 16.5 31.9 40.6 26.5...

  • Page 5: Refrigerant Cycle Diagram

    3. Refrigerant Cycle Diagram 4.1 Refrigeration circuit drawing of inverter DUAL (2 Zone) 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 EXCHANGE T4 Ambient T1 Room EXCHANGE (EVAPORATOR)
  • Page 6 4.3 Refrigeration circuit drawing of inverter Quad (4 Zone) 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 HEAT HEAT...

  • Page 7: Installation Details

      Additional refrigerant charge 4. Installation Details 2 Zone 3 Zone 4 Zone 5 Zone 5.1 Wrench torque sheet for installation Pre-charged up to 22.5 37.5 max total pipe (50 ft) (75 ft) (100 ft) (125 ft) length m (ft) Outside Additional tightening Torque...

  • Page 8: Installation For The First Time

    5.4 Installation for the first time: 2. Assure that both the 2-way (Liquid) and 3-way (Gas) valves for each circuit at the outdoor unit Air and moisture in the refrigerant system will result STAY CLOSED as they arrived originally. in significant problems with your system: 3.
  • Page 9 (An electronic leak detector will be more efficient circuit service valves, where the indoor units are to use for this if available). attached. See the red circles on the picture below. 14. Re-insert proper size Allen wrench into the valve core of the Liquid Valve (2 way) valve for circuit A and turn it counter clockwise until it is fully back seated.
  • Page 10 Evacuation using a vacuum pump: 9. If the proper vacuum cannot be achieved within 30 minutes, the vacuum pump should be kept running for an additional 15 minutes. If after the additional 15 minutes of operation, the vacuum still cannot be achieved, there could be a leak at one or more of the flare pipe connections at either end of a refrigerant pipes.
  • Page 11 18. Power up the system, and run the indoor unit for circuit A in COOLING mode to assure that all functions are working. 19. Switch the indoor unit of circuit A to HEAT mode and assure that all functions are working. 20.
  • Page 12 6. Set the refrigerant container on an electronic Procedure charging scale and record the weight (or zero-out the scale depending on the scale used). 7. Start all indoor units attached to the system in cooling mode and lower the set points on each of their controllers to the minimum setting so the system will not shut off during the procedure.
  • Page 13 9. If the proper vacuum cannot be achieved within this time frame, the vacuum pump should be kept running for an additional 1 hour. If after the additional 1 hour of operation the vacuum still cannot be achieved, there could be a leak at one or more of the flare pipe connections at either end of a refrigerant pipe.

  • Page 14: Evacuation After Servicing The Outdoor Unit Refrigeration Circuit

    19. Open the low pressure valve on the gauge 3. While the system is running, first close the 2-way manifold set to start charging the unit with liquid (Liquid) valve entirely and monitor the low pressure refrigerant for the remaining amount. Please gauge.

  • Page 15: Electronic Function

    6. Electronic Function 6.3.3 Fan Speed is out of control. ---- When outdoor fan speed is lower than 100RPM 6.1 Abbreviation or higher than 2400RPM for 60 seconds, the system T1: Indoor ambient temperature stops and LED displays E8 failure. T2: Coil temperature of indoor heat exchanger at 6.3.4 Inverter module Protection.
  • Page 16 Cooling mode: HeatT4Zone3I Heating limit  14＞T4≥10℃ current value HeatT4Zone2I CoolT4Zone5I Heating  9＞T4≥6℃ limit current ℃                 value HeatT4Zone1I Heating  5＞T4 limit current value 50     Heating stop protection current HeatStopI value 49               6.3.7 Indoor / outdoor unit communication CoolT4Zone4I 45                protection  44                ...

  • Page 17: Control And Functions

    6.4 Control and Functions Heating mode 6.4.1 Capacity Request Calculation T1 Ts Total capacity Request=Σ(Norm code × HP) /10 + correction Cooling mode: T1 Ts Capacity area Norm code (N) Model Capacity area Note: The final result is an integer. Norm code (N) Then modify it according to T2 average (correction):...

  • Page 18: Defrosting Action

    6.4.2 Defrosting control ① T3 > TempQuitDefrost_ADD ℃;. Condition of defrosting: ② The defrosting time reaches 10min. If any one of the following items is satisfied, system ③ Turn to other modes or off. will enter into the defrosting cycle. After the compressor starts up and keeps running, marks the minimum value of T3 from the 10th 6.4.3 Outdoor fan control...
  • Page 19 6.4.4.1 Cooling mode The initial open angle of EXV is depends on indoor Increase fan speed increase model size, and the adjustment range is 100-400p. LowCoolT3_ON When the unit starts to work for 3 minutes, the outdoor will receive indoor units’ capacity demand Keep current fan speed (T2B) information and calculate their average.

  • Page 20: Wiring Diagrams

    7. Wiring Diagrams 8.1 Wiring diagram of DUAL (2) Circuit Outdoor Unit YN020GMFI22M2D...
  • Page 21 8.2 Wiring diagram of TRIPLE (3) Circuit Outdoor Unit YN030GMFI22M3D...
  • Page 22 8.3 Wiring diagram of QUAD (4) Circuit Outdoor Unit YN040GMFI22M4D...
  • Page 23 8.4 Wiring diagram of QUINT (5) Circuit Outdoor Unit YN050GMFI22M5D  ...

  • Page 24: Troubleshooting

    8. Troubleshooting 8.1Safety Because there are high power capacitors on PCB and related circuits in outdoor unit, even after shutting down the power supply, risk of electrocution still exists. Do not forget to discharge the electrical power in these capacitors. Use a 25~40 W bulb or resistor with resistance value of about 1500 ohm to 2000 ohm to discharge the power in the capacitors.

  • Page 25: I Ndoor Unit Error Display

    8.2 Indoor Unit Error Display For 2015 or earlier Floor Console Models FB012GMFI16HLD (2015 or earlier) Operation Timer De-frost Failure Indoor room temperature sensor (T1 ) malfunction ★ Evaporator coil temperature sensor (T2) malfunction ★ Communication malfunction between indoor and outdoor units ★...
  • Page 26 For 2015 or earlier Concealed Duct / Cassette / Floor Ceiling Models: RB012GMFI16HLD, RB018GMFI16HLD (2015 and earlier) CB012GMFI16HLD, CB018GMFI16HLD (2015 and earlier) UB012GMFI16HLD, UB018GMFI16HLD (2015 and earlier) ODU Error Alar Display Operation Timer Failure frost code Indoor room temperature sensor (T1 ★...
  • Page 27 For 2015 or earlier Wall Mount Models WB009GMFI16HLD, WB012GMFI16HLD, WB018GMFI16HLD (2015 and earlier) De-frost Timer Auto Operatio Failure Display             Indoor unit EEPROM parameter error Communication malfunction between indoor and ★   ★  ...
  • Page 28 For All 2016 and newer Models: Wall Mount, Concealed Duct / Cassette / Floor Console / Floor Ceiling): 1) Wall Mounted: WS009GMFI22HLD, WS012GMFI22HLD, WS018GMFI22HLD, WS024GMFI22HLD. 2) Ceiling Concealed: RB009GMFILDFHD, RB012GMFILDFHD, RB018GMFILDFHD, RB024GMFILDFHD. 3) Cassette: CB009GMFILDFHD, CB012GMFILDFHD, CB018GMFILDFHD, CB024GMFILDFHD. 4) Floor Console: FB009GMFILDFHD, FB012GMFILDFHD.

  • Page 29: Outdoor Unit Error Display

    Outdoor unit error display YN020GMFI22M2D, YN030GMFI22M3D, YN040GMFI22M4D, YN050GMFI22M5D, 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...

  • Page 30: Outdoor Unit Display

    8.3 Outdoor Unit Display 8.3.1 Outdoor unit point check function: There is a pushbutton switch in the outdoor PCB as marked below (SW1). Push the switch SW1 to check the states of unit when it is running. The digital display LED will display the following information after pushing the SW1 each time.
  • Page 31 The frequency after the frequency limit The frequency sending to compressor control chip A indoor unit evaporator outlet temp.(T B indoor unit evaporator outlet temp.(T If the temp. is lower than -9 degree, the digital display tube will show “- 9”.If the temp.
  • Page 32 8.3.2 Outdoor unit’s digital display LED will display the following information except in the checking mode as described above:  In standby , the LED displays “- -”  During the compressor is operating, the LED display the running frequency, ...

  • Page 33: Diagnosis And Solution

    8.4 Diagnosis and Solution 8.4.1 Indoor unit trouble shooting 8.4.1.1 Indoor unit EEPROM parameter error diagnosis and solution. Malfunction decision PCB main chip does not receive feedback from EEPROM chip conditions ● Installation mistake ● PCB faulty Trouble shooting: Supposed causes EEPROM: a read‐only memory whose contents can be erased and reprogrammed using a pulsed voltage. ...
  • Page 34 8.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and solution. Malfunction decision Indoor unit does not receive the feedback from outdoor unit conditions during 120 seconds. Supposed causes ● Wiring mistake ● Indoor or outdoor PCB faulty Trouble shooting:...
  • Page 35 Pic 1: Use a multimeter to test the DC voltage between 2 (previously: L2) port and S port of outdoor unit. The red pin of multimeter connects with 2 (previously: L2) port while the black pin is for S port. (Set multimeter to read DC volts) When AC is normally running, the voltage will move alternately...
  • Page 36 Pic 2: IPM (for 2 zone/ 3-zone) 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.
  • Page 37 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. 8.4.1.3 Zero-crossing signal detection error diagnosis and solution. Malfunction decision When PCB does not receive zero crossing signal feedback for conditions 4 minutes or the zero crossing signal time interval is abnormal. Supposed causes ● Connection mistake ●...
  • Page 38 8.4.1.4 Indoor fan speed has been out of control diagnosis and solution. Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure. conditions Supposed causes ● Wiring mistake ●...
  • Page 39 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 40 8.4.1.5 Temperature sensor malfunction diagnosis and solution. Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure. conditions Supposed causes ● Wiring mistake ● Sensor faulty ● PCB faulty Trouble shooting: Check the connections between temperature Correct the connections.
  • Page 41 8.4.1.6 Inverter module (IPM) malfunction diagnosis and solution. Malfunction decision When the voltage signal that IPM send to compressor drive conditions chip is abnormal, the display LED will show “P6” and AC will turn off. Supposed causes ● Wiring mistake ●...
  • Page 42 8.4.1.7 Over-voltage or under-voltage protection diagnosis and solution.
  • Page 43 8.4.1.8 Compressor top high temperature protection (OLP) diagnosis and solution. If the sampling voltage is not 5V, the LED will display the Malfunction decision conditions failure. Supposed causes ● Wiring mistake ● Over load protector faulty ● System block ● Outdoor PCB faulty...
  • Page 44 8.4.1.9 Compressor drive malfunction diagnosis and solution The trouble shooting is same with one of IPM module protection(P0). Water-level alarm malfunction 8.4.1.10 diagnosis and solution Malfunction decision If the sampling voltage is not 5V, the LED will display the conditions failure.
  • Page 45 8.4.1.11 Indoor unit mode conflict (Between indoor units). P5 OR -- (Double Dash) Error Code Malfunction decision The indoor units cannot work cooling mode and heating at same time. conditions Heating mode has a priority. Unit action ● Suppose Indoor unit A working in cooling mode or fan mode, and indoor unit B is set to heating mode, then A will change to off and B will work in heating mode.
  • Page 46 8.4.2 Outdoor unit trouble shooting 8.4.2.1 E0 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code Malfunction decision PCB main chip does not receive feedback from EEPROM chip conditions Supposed causes ● Installation mistake ● PCB faulty Trouble shooting: Outdoor EEPROM malfunction Outdoor EEPROM malfunction Power off, then restart the...
  • Page 47 8.4.2.2 E2(Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code Malfunction decision 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. Supposed causes ●...
  • Page 48 Pic 1: Use a multimeter to test the DC voltage between 2 (previously: L2) port and S port of outdoor unit. The red pin of multimeter connects with 2 (previously: L2) port while the black pin is for S port. (Set the multimeter to read DC volts When AC is normal running, the voltage will move alternately...
  • Page 49 Pic 2: IPM board (for 2 zone/ 3-zone) Operating  Standby  Pic 2: IPM (for5 zone) Operating  Standby  Power ...
  • Page 50 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 51 8.4.2.3 E3 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code Malfunction decision PCB main chip does not receive feedback from IPM module conditions during 60 seconds. Supposed causes ● Wiring mistake ● PCB faulty Trouble shooting:...
  • Page 52 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 53 8.4.2.4 E4 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and solution. Error Code E4/F1/F2/F3/F4/F5 Malfunction decision If the sampling voltage is lower than 0.06V or higher than conditions 4.94V, the LED will display the failure.
  • Page 54 8.4.2.5 E5 (Over-voltage or under-voltage protection) diagnosis and solution. Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. conditions Supposed causes ● Power supply problems. ● System leakage or block ●...
  • Page 55 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 56 IPM board (for 4-zone) 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)
  • Page 57 IPM Module (for 5-zone)
  • Page 58 8.4.2.6 E6 (PFC module protection) error diagnosis and solution. Error Code Malfunction decision When the voltage signal that PFC sends to main control board conditions is abnormal, the display LED will show “E6” and AC will turn off. Supposed causes ●...
  • Page 59 Inductance Two ports of the inductance...
  • Page 60 8.4.2.7 E8 (Outdoor fan speed has been out of control) diagnosis and solution Error Code Malfunction decision When outdoor fan speed keeps too low (300RPM) or too conditions high(2400RPM) for certain time, the unit will stop and the LED will display the failure.
  • Page 61 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 63 8.4.2.8 P0 (Compressor top high temperature protection (OLP)) diagnosis and solution. Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes ● Wiring mistake ● Over load protector faulty ● System block ●...
  • Page 65 8.4.2.9 P1 (High pressure protection) diagnosis and solution. Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the conditions failure. Supposed causes ● Wiring mistake ● Over load protector faulty ● System block ● Outdoor PCB faulty Trouble shooting:...
  • Page 67 8.4.2.10 P2 (Low pressure protection) diagnosis and solution. Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the conditions failure. Supposed causes ● Wiring mistake ● Over load protector faulty ● System block ● Outdoor PCB faulty Trouble shooting:...
  • Page 69 8.4.2.11 P3 (Current overload protection) diagnosis and solution. Error Code Malfunction decision If the outdoor current exceeds the current limit value, the LED conditions will display the failure. Supposed causes ● Wiring mistake ● Over load protector faulty ● System block ●...

  • Page 71: Error Code

    8.4.2.12 P4 (Temperature protection of compressor discharge) diagnosis and solution. Error Code Malfunction decision When the compressor discharge temperature(T5) is more conditions than 115℃ for 10 seconds, the compressor will stop restart till T5 is less than 90℃. Supposed causes ●...
  • Page 72 Error Code Malfunction decision When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe temperature is less conditions than 52°C Supposed causes ● The condenser temperature sensor faulty ● Heat exchanger dirty ●...
  • Page 73 8.4.2.14 P6 (Inverter module (IPM) malfunction) diagnosis and solution. Error Code Malfunction decision When the voltage signal that IPM send to compressor drive conditions chip is abnormal, the display LED will show “P6” and AC will turn off. Supposed causes ●...

  • Page 74: Trouble Criterion Of Main Parts

    8.4. 2.15 The cooling operation or heating operation does not operate. Supposed causes ● 4-way valve faulty Check of 4-way valve, please refer to part 5 in 9.5 Trouble Criterion of Main Parts. 8.4.2.16 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 75 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 76 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...
  • Page 77 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 78 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 79 Position Resistance Value YDK70- YDK53- 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% (20 88.5Ω±8% Black - (20 ℃ ) (20 ℃ ) (20 ℃ ) (20 ℃ ) (20 ℃ ) ℃ ) (20 ℃ ) 76Ω±8% 19Ω±8% (20 252Ω±8%...
  • Page 80 6.EXV check Disconnect the connectors. Resistance to EXV coil Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White...
  • Page 81 Red- Blue Red - Yellow...
  • Page 82 Brown-Orange Brown-White...

  • Page 83: Disassembly Instructions

    Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine.  DUAL (2 ZONE) OUTDOOR UNIT (WCA30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) Turn off the air conditioner ②...
  • Page 84 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 85 Screws of front panel 2) Remove the screws of big handle, and remove the big handle.(4 screws) 3) Remove two screws of terminal board and seven Screws of big handle screws of right-rear panel, and remove the right-rear panel. Screws of terminal board Screws of right- rear panel...
  • Page 86 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 87 CN17:T3/T4 temperature sensor CN17 CN15 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 expansive 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) CN3:L-IN (red) ⑧...
  • Page 88 Compressor How to remove the compressor. 1) Perform work of item 1,2. 2) Remove the cover of electrical control box. 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of ⑥...
  • Page 89 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 90 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.  TRIPLE (3 ZONE) OUTDOOR UNIT (WD30 metal plate) No. ...
  • Page 91 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear panel.
  • Page 92 Screws of right-rear panel Screws of terminal board 108 ...
  • Page 93 How to remove the fan assembly. assembly 1) Remove the top cover, right front side panel and ② front panel from item 1.step 2) Remove the hex nut fixing the fan. ④ 3) Remove the fan. 4) Remove the cover of electrical control box cover.
  • Page 94 How to remove the electrical ③ parts. Electrical parts 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. Unfasten the connector of the reactor. IPM board PCB board Unfasten the connector of the compressor. Disconnect following 3 ④...
  • Page 95 Disconnect the CN15 CN7 CN17 CN18/CN19/CN22 connectors and wires connected from PCB and other parts. Connectors: CN17:T3/T4 temperature sensor (2p/2p,white) CN20 CN7: Discharge temperature sensor CN23 (2p,white) CN25 CN12:Ttop temperature sensor(2p,white) CN15:T2B-A,B,C temperature sensor (2p/2p/2p,white) CN18/CN19/CN22: Electronic expansive valve A,B,C (6p/6p/6p,red/red/red) CN1/CN2 CN5/CN6...
  • Page 96 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 97 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 98 How to remove the expansion expansion valve valve 1) Perform work of item 1,2. 2) Remove the electrical parts Expansion valves from item 3. 3) Remove the coils. 4) Detach the welded parts of expansion valves and pipes.  QUAD (4 ZONE) OUTDOOR UNIT (WD30 metal plate) Part name Procedures Remarks...
  • Page 99 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen screws of right-rear panel, and remove the right-rear panel.
  • Page 100 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. 116 ...
  • Page 101 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 screws. ⑥...
  • Page 102 pieces of connection wires and connectors between driver ④ 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 103 CN10/CN44: Crankcase heating cable (black-red) CN13 CN1:L1-IN (red) CN33 CN10 CN2:L2-IN (black) CN22 CN40 CN2 CN1 CN44 Disconnect the grounding wire (yellow-green) after removing the right-rear panel. 9) Remove the PCB board. ⑧ How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate.
  • Page 104 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 105  QUINT (5 ZONE) OUTDOOR UNIT (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 106 6) Remove the screws of front side panel, and remove the front side panel (1 screw) 7) Disconnect the fan motor connectors FAN1(3p,white) and FAN2(3p,white) from DC motor driver board. ⑥ 8) Remove the fan motor after unfastening fixing screws. ⑦...
  • Page 107 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 108 DC Fan Driver board 2) Disconnect the fan motor Connector(5p,white) from the IPM board. Disconnect following 8 pieces of connection wires and connectors between IPM and other parts. CN2(yellow) CN1(red) CN6(black) CN3(yellow) U、V、W(black) CN9(10p,white) 4) Remove the fixing screws then remove the IPM board. Disconnect the connectors and wires connected from PCB and other...
  • Page 109 (2p,white) CN12：Heatsink temperature sensor(2p,red) CN9:T3/T4 temperature sensor (2p/2p,white) CN13 CN16 CN11:T2B-A,B,C,D,E temperature CN21 sensor (2p/2p/2p/2p/2p,white) CN29 CN37 CN15/CN23/CN26/CN30/CN33: CN8 CN12 Electronic expansive valve CN9 CN11 (6p/6p/6p/6p/6p,red) CN37/CN29/CN21/CN16/CN13: S- A,S-B,S-C,S-D,S-E (3p/3p/3p/3p/3p,white) CN10: High and low pressure switch (2p/2p, white) Wires: CN10 CN17/CN18: 4-way valve (blue-blue) CN30/CN23 CN19/CN20: connected to crankcase...
  • Page 110 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 111 The 4-way How to remove the 4-way valve valve 6) Perform work of item 1 step 5~6 and item 2.. Coil 7) Extract refrigerant gas. Welded parts 8) Remove the electrical parts from item 3. 9) Remove fixing screw of the coil, and remove the coil.

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