Midea MFM-160N8R-1 Service Manual
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Midea MFM-160N8R-1 Service Manual

Midea MFM-160N8R-1 Service Manual

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MFM-160(55)N8R-1

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Summary of Contents for Midea MFM-160N8R-1

  • Page 1 Service Manual Floor Standing MFM-160(55)N8R-1...
  • Page 3 Table of Contents §. Safety Precautions Precautions Information servicing(For flammable materials) §. Specifications Model Reference Pipe length and the Drop Height Refrigerant Cycle Diagrams Electrical Wiring Diagrams §. Product Features Display Function Safety Features Basic Features §. Maintenance First Time Installation Check Refrigerant Recharge Re-Installation §.
  • Page 5 Safety Precautions Contents Precautions ......................2 Information servicing(For flammable materials) ..........3...
  • Page 6 1. Precautions CAUTION To prevent personal injury, or property or unit damage, • While unpacking be careful of sharp edges around adhere to all precautionary measures and instructions the unit as well as the edges of the fins on the con- denser and evaporator.
  • Page 7 2. Information servicing(For to the surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to make sure flammable materials) that there are no flammable hazards or ignition risks. NO SMOKING signs shall be displayed. Checks to the area Ventilated area •...
  • Page 8 • that capacitors are discharged: this shall be done in a shall also take into account the effects of aging or safe manner to avoid possibility of sparking continual vibration from sources such as compressors or fans. • that there no live electrical components and wiring are exposed while charging, recovering or purging the 2.13 Detection of flammable refrigerants system;...
  • Page 9 • The refrigerant charge shall be recovered into the • Before attempting the procedure ensure that: correct recovery cylinders. The system shall be flushed • mechanical handling equipment is available, if with OFN to render the unit safe. This process may required, for handling refrigerant cylinders;...
  • Page 10 • Empty recovery cylinders are evacuated and, if are unaware of the procedure taking place possible, cooled before recovery occurs. • The hose must be of sufficient length and diameter • The recovery equipment shall be in good working such that it will extend to at least 3 m beyond the order with a set of instructions concerning the outside of the building equipment that is at hand and shall be suitable for the...
  • Page 11 Specifications Contents Model Reference ....................8 Pipe Length and Drop Height ................9 Refrigerant Cycle Diagrams ................10 Electrical Wiring Diagrams ..................11...

  • Page 12: Model Reference

    1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model. Indoor Unit Model Outdoor Unit Model Capacity (Btu/h) Power Supply MFM-55HRFN8-QRD0W MOX630U-55HFN8-RRD0W(GA) 3Phase, 380~415V, 50Hz  Page 8 ...

  • Page 13: Pipe Length And Drop Height

    2. Pipe Length and Drop Height The length and elevation of connection pipe are shown in the table below. if the pipe length exceeds max pipe length, additional refrigerant should be charged to ensure nominal cooling/heating capacity. Capacity(Btu/h) Standard Length Max Pipe Length Max Elevation Additional Refrigerant...

  • Page 14: Refrigerant Cycle Diagrams

    3. Refrigerant Cycle Diagrams  Page 10 ...

  • Page 15: Electrical Wiring Diagrams

    4. Electrical Wiring Diagrams Indoor and outdoor unit wiring diagram Indoor Unit Outdoor Unit IDU Model IDU Wiring Diagram ODU Model ODU Wiring Diagram MFM-55HRFN8-QRD0W 16022200009897 MOX630U-55HFN8-RRD0W(GA) 16022000039770 Outdoor unit printed circuit board diagram Outdoor Unit ODU Model ODU Printed Circuit Board 17122000054636 MOX630U-55HFN8-RRD0W(GA) ...
  • Page 16 Indoor unit abbreviations Abbreviation Paraphrase Yellow-Green Conductor HOR-SW Horizontal Fan VER-SW Vertical Fan LIVE NEUTRAL Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger Outdoor unit abbreviations Abbreviation Paraphrase COMP Compressor CAP1,CAP2 Fan Motor Capacitor AC Current Detector Electric Expansion Valve DC FAN1,DC FAN2 Outdoor DC Fan AC FAN1,AC FAN2...
  • Page 17  Page 13 ...
  • Page 18  Page 14 ...
  • Page 19 Outdoor unit printed circuit board diagram: 17122000054636 Outdoor unit printed circuit board diagram: 17122000054636  Page 15 ...
  • Page 20 Name Meaning DC FAN2 CN302 Connect to DC motor driver module(for double fan models) DA FAN1 CN31 Connect to DC fan motor(for single fan models) Test port CN174 used for testing Connect to DC motor driver module,208-230V AC(for double fan POWER_F CN510 models)
  • Page 21 Name Meaning CN708 CN708 Connect to reactor CN707 CN707 CN700 CN700 Earth: connect to Ground Connect to compressor Note: This section is for reference only. Please take practicality as standard.  Page 17 ...
  • Page 22  Page 18 ...

  • Page 23: Table Of Contents

    Product Features Contents Display Function ....................20 Safety Features ....................21 Basic Functions .....................22 Table ......................22 Abbreviation ....................23 Fan Mode ....................23 Cooling Mode .....................23 Heating Mode .....................24 Auto-mode ....................25 Drying Mode ....................25 Sleep Function .....................25 Optional Functions ....................27...

  • Page 24: Display Function

    1. Display Function Unit display functions Auto operation Cooling operation Room Temp/Set Temp/Set Timer Dry operation display Heating operation Fan operation Fan speed operation Vertical air ow display Horizontal air ow Avoid direct air ow blowing When wireless control feature is activated(some units) Electric heating function(some units) Lock operation...

  • Page 25: Safety Features

    2. Safety Features Indoor fan delayed operation • When the unit starts, the louver is automatically Compressor three-minute delay at restart activated and the indoor fan will operate after a period Compressor functions are delayed for up to three minutes of setting time.

  • Page 26: Basic Functions

    3. Basic Functions Table Cooling Mode&Heating mode Heating Mode Functions Auto Mode Outdoor Fan Control Defrosting Mode Case 1: Compressor Cases Case 2:T4 Case 1 Case 2 Case 1: Case 2: Frequency and T4 Models Note: The detailed description of case 1 or case 2 is shown in the following function sections(from 3.4 to 3.6). ...

  • Page 27: Abbreviation

    3.2 Abbreviation compressor ceases operation. • When calculated frequency(fb) is less than minimum Unit element abbreviations limit frequency(FminC). • When protective time is more than or equal to ten Abbreviation Element minutes. Indoor room temperature • When T1 is lower than or equal to (Tsc-CDIFTEMP). Coil temperature of evaporator Note: CDIFTEMP is EEPROM setting parameter.

  • Page 28: Heating Mode

    3.4.4 Condenser Temperature Protection When condenser temperature is more than setting value, the compressor ceases operation.. 3.4.5 Evaporator Temperature Protection When evaporator temperature drops below a configured value, the compressor and outdoor fan cease operation. 3.5 Heating Mode(Heat pump units) 3.5.1 Compressor Control 1) Reach the configured temperature...

  • Page 29: Auto-Mode

    • T3 maintained above TCDE2 for 80 seconds. and the setting temperature can be changed between 17°C~30°C. • Unit runs for 15 minutes consecutively in defrosting Case 1: mode. • If T4 is lower than or equal to -22°C and compressor •...
  • Page 30 • The operational process for sleep mode is as follows: • When cooling, the temperature rises 1°C(2°F) (to not higher than 30°C(86°F)) every hour. After 2 hours, the temperature stops rising and the indoor fan is fixed at low speed. •...

  • Page 31: Optional Functions

    4. Optional Functions Auto-Restart function • The indoor unit has an auto-restart module that 8°C Heating allows the unit to restart automatically. The module automatically stores the current settings and, in the In heating mode, the temperature can be set to as low case of a sudden power failure, will restore those as 8°C, preventing the indoor area from freezing if setting automatically after power returns.
  • Page 32  Page 28 ...
  • Page 33 Maintenance Contents First Time Installation Check ................30 Refrigerant Recharge ..................32 Re-Installation .....................33 Indoor Unit ....................33 Outdoor Unit ....................35...

  • Page 34: First Time Installation Check

    1. First Time Installation Check Air and moisture trapped in the refrigerant system affects To prevent air and moisture from affecting the air the performance of the air conditioner by: conditioner’s performance, the indoor unit, as well as the pipes between the indoor and outdoor unit, must be be •...
  • Page 35 Procedure: • If the pressure successfully reaches -0.1 MPa Tighten the flare nuts of the indoor and outdoor (14.5 Psi), fully close the Handle Lo valve, then units, and confirm that both the 2- and 3-way valves cease vacuum pump operations. are closed.

  • Page 36: Refrigerant Recharge

    2. Refrigerant Recharge mA A Procedure: Close both 2- and 3-way valves. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode to charge 3-way service port. the system with liquid refrigerant. Connect the charge hose to the valve at the bottom When the electronic scale displays the correct of the cylinder.

  • Page 37: Re-Installation

    3. Re-Installation Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: Confirm that the 2- and 3-way valves are opened. Close the 3-way valve so that the gauge rests between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi). Connect the charge hose with the push pin of Handle Lo to the 3-way valve’s gas service port.
  • Page 38 Air purging with vacuum pump Procedure: Tighten the flare nuts of the indoor and outdoor • If the pressure successfully reaches -0.1 MPa (14.5 Psi), fully close the Handle Lo valve, then units, and confirm that both the 2- and 3-way valves cease vacuum pump operations.

  • Page 39: Outdoor Unit

    Outdoor Unit Evacuation for the whole system Procedure: Wait for 5 minutes then check whether the gauge Confirm that the 2- and 3-way valves are opened. needle moves after turning off the vacuum pump. If Connect the vacuum pump to the 3-way valve’s the gauge needle moves backward, check whether service port.
  • Page 40 Refrigerant charging mA A Procedure: Close both 2- and 3-way valves. Fully open the Handle Lo manifold valve, 2- and 3-way valves. Slightly connect the Handle Lo charge hose to the 3-way service port. Operate the air conditioner in cooling mode to charge the system with liquid refrigerant.
  • Page 41 Troubleshooting Contents 1. Safety Caution ..................... 39 2. General Troubleshooting ................40 Error Display (Indoor Unit) ..................40 Error Display (For Some Outdoor Units) ..............42 3. Complain Record Form ................. 43 4. Information Inquiry ..................45 5. Outdoor Unit Point Check Function ......
  • Page 42 Troubleshooting Contents PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage protection)/PC 12(Outdoor unit main control board DC bus high voltage protection /341 MCE error) Diagnosis and Solution ....................68 PC 04(Inverter compressor drive error Diagnosis and Solution) ........

  • Page 43: Safety Caution

    1. Safety Caution WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip oneself with antistatic gloves or wrist strap to avoid damage to the board. WARNING Electricity remains in capacitors even when the power supply is off.

  • Page 44: General Troubleshooting

    2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following table: Display Error Information...
  • Page 45 Inverter compressor drive error TS33 PC 04 PFC module protection TS40 PC 0F Communication error between outdoor main chip and compressor driven chip TS37 PC 40 High pressure protection or low pressure protection TS44/TS34 PC 03 Outdoor unit malfunction TS36 EC 0 Indoor and outdoor mismatch malfunction TS43...

  • Page 46: Error Display (For Some Outdoor Units)

    Error Display (For Some Outdoor Units) Display Malfunction or Protection Solution Outdoor EEPROM malfunction TS21 EC 51 Indoor / outdoor units communication error TS22 EL 01 Communication malfunction between IPM board and outdoor main board TS37 PC 40 Outdoor overcurrent protection TS38 PC 08 Outdoor unit low AC voltage protection...

  • Page 47: Complain Record Form

    3. Complain Record Form Complain Record Form Request No.: Date: Installation Date: Service Date: Customer Information Name Telephone No. Home Address Email Product Information Indoor Unit Model Outdoor Unit Model Serial No. of indoor unit Serial No. of outdoor unit Working Mode □Cooling □Heating...
  • Page 48 Parameter Checking information by Remote controller Displaying code Displaying code meaning Display value Display value meaning Room temperature Indoor coil temperature Outdoor coil temperature Ambient temperature Discharge temperature Targeted Frequency Actual Frequency Compressor current Outdoor AC voltage Indoor capacity test Reserve Outdoor fan speed EXV opening steps...

  • Page 49: Information Inquiry

    4. Information Inquiry • To enter information inquiry status, complete the following procedure within 10 seconds: • Press LED 3 times. • Press SWING 3 times. • Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter checking mode.
  • Page 50 Error code of information inquiry: Display Error Information EH 00/EH 0A Indoor unit EEPROM parameter error Indoor / outdoor unit communication error EL 01 EH 31 Over low voltage protection of indoor external fan Over voltage protection of indoor external fan EH 32 Over-current protection of indoor external fan EH 33...
  • Page 51 Over voltage or over low voltage protection PC 01 Top temperature protection of compressor or High temperature protection of IPM module or High PC 02 pressure protection PC 40 Communication error between outdoor main chip and compressor driven chip Current Input detection protection Pc 41 Compressor start error PC 42...

  • Page 52: Outdoor Unit Point Check Function (For Some Outdoor Unit)

    5. Outdoor Unit Point Check Function (For Some Outdoor Unit) • A check switch is included on the outdoor PCB(For Some Outdoor Unit). • Push SW1 to check the unit’s status while running. The digital display shows the following codes each time the SW1 is pushed.
  • Page 53 Evaporator pipe temp. T2 of 1# indoor If the temp. is lower than 0 C, the digital display tube will show “0”.If the unit temp. is higher than 70 degree, the digital display tube will show “70”. If the Evaporator pipe temp. T2 of 2# indoor indoor unit is not connected, the digital display tube will show: “--”...

  • Page 54: Error Diagnosis And Troubleshooting Without Error Code

    6. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start TS16 - TS17...

  • Page 55: Field Maintenance

    Field maintenance Problem Solution Unit will not start TS18 - TS19 Compressor will not start but fans run TS18 - TS19 Compressor and condenser (outdoor) fan will not start TS18 - TS19 Evaporator (indoor) fan will not start TS18 - TS19 Condenser (Outdoor) fan will not start TS18 - TS19 Unit runs, but shortly stops...
  • Page 56 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ The power switch is on but fans will not start ☆ ☆ ☆ The temperature on the display board cannot be set ☆...
  • Page 57 1.Remote Maintenance Others Possible causes of trouble Unit will not start The power switch is on but fans will not start ☆ The temperature on the display board cannot be set Unit is on but the wind is not cold(hot) Unit runs, but shortly stops The unit starts up and stops frequently ☆...
  • Page 58 2.Field Maintenance Refrigerant Circuit Others Possible causes of trouble Unit will not start Compressor will not start but fans run ☆ Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops ☆...
  • Page 59 2.Field Maintenance Electrical Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆...

  • Page 60: Quick Maintenance By Error Code

    7. Quick Maintenance by Error Code If you do not have the time to test which specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement...

  • Page 61: Troubleshooting By Error Code

    8. Troubleshooting by Error Code EH 00/ EH 0A / EC 51 (EEPROM Parameter Error Diagnosis and Solution) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.

  • Page 62: El 01 (Indoor And Outdoor Unit Communication Error Diagnosis And Solution)

    EL 01 (Indoor and Outdoor Unit Communication Error Diagnosis and Solution) Description: Indoor unit can not communicate with outdoor unit Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Reactor Troubleshooting and repair: Power off, then restart the unit after 2 minutes.
  • Page 63 Remarks: • Use a multimeter to test the DC voltage between 2 port(or S or L2 port) and 3 port(or N or S port) of outdoor unit. The red pin of multimeter connects with 2 port(or S or L2 port) while the black pin is for 3 port(or N or S port) . •...
  • Page 64 XYE Communication: Recommended parts to prepare: • Signal wires • Magnet ring • Indoor PCB • Outdoor PCB Troubleshooting and repair: Power off, then restart the unit 2 Power off, then restart the unit 2 minutes later minutes later Check whether there’s any Check whether there’s any interference.

  • Page 65: Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of Normal Range)/Ec

    EH 03 / EC 07 (Fan Speed Is Operating Outside of Normal Range)/EC 71(Over Current Failure of Outdoor DC Fan Motor) Diagnosis and Solution Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the unit ceases operation and the LED displays the failure.
  • Page 66 Index: 1. Indoor or Outdoor DC Fan Motor(control chip is in 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 has problems and need to be replaced. Color Signal Voltage...
  • Page 67 CON1 Drive Chip EEPROM FAN1 FAN2 IPM for DC Rectifier Part Description Parameter Remark CON1 Power input for the PCB 192-380V/DC Communication with main PCB Test port 5V/DC For debugging board FAN1 UVW output for DC fan motor FAN2 UVW output for DC fan motor CN1 Communication with main PCB Signal Voltage...

  • Page 68: Eh 60/Eh 61/Ec 53/Ec 52/Ec 54/Ec 55/Ec 50/Ec 05 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)

    EH 60/EH 61/EC 53/EC 52/EC 54/EC 55/EC 50/EC 05 (Open Circuit or Short Circuit of Temperature Sensor Diagnosis and Solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays the failure. Recommended parts to prepare: •...

  • Page 69: El 0C (Refrigerant Leakage Detection Diagnosis And Solution)

    EL 0C (Refrigerant Leakage Detection Diagnosis and Solution) Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 < Tcool-1°C(1.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep for 3 minutes, and this situation happens 3 times, the display area will show “EL 0C”...

  • Page 70: Eh 0B(Indoor Pcb / Display Board Communication Error Diagnosis And Solution)

    EH 0b(Indoor PCB / Display board communication error diagnosis and solution) Description: Indoor PCB does not receive feedback from the display board. Recommended parts to prepare: • Communication wire • Indoor PCB • Display board Troubleshooting and repair: Power off, then restart the unit 2 minutes later Is it still displaying the error code? The unit functions normally...

  • Page 71: Pc 00(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution)

    PC 00(IPM malfunction or IGBT over-strong current protection Diagnosis and Solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “PC 00” and the AC turn off. Recommended parts to prepare: •...

  • Page 72: Pc 01(Over Voltage Or Too Low Voltage Protection)/Pc

    PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low AC voltage protection)/PC 11(Outdoor unit main control board DC bus high voltage protection)/PC 12(Outdoor unit main control board DC bus high voltage protection /341 MCE error) Diagnosis and Solution Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit.

  • Page 73: Pc 04(Inverter Compressor Drive Error Diagnosis And Solution)

    PC 04(Inverter compressor drive error Diagnosis and Solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare: • Connection wires •...

  • Page 74: Pc 03/Pc 31(Low Pressure Protection Diagnosis And Solution)

    8.10 PC 03/PC 31(Low Pressure Protection Diagnosis and Solution) Description: If the sampling voltage is not 5V, the LED displays a failure code. Recommended parts to prepare: • Connection wires • Low pressure protector • Indoor fan assembly • Outdoor PCB Troubleshooting and repair: Low pressure protection Low pressure protection...

  • Page 75: Pc 02(Top Temperature Protection Of Compressor Or High Temperature Protection Of Ipm Module Diagnosis And Solution)

    8.11 PC 02(Top temperature protection of compressor or High temperature protection of IPM module diagnosis and solution) Description: For some models with overload protection, If the sampling voltage is not 5V, the LED will display the failure. If the temperature of IPM module is higher than a certain value, the LED displays the failure code. Recommended parts to prepare: •...

  • Page 76: Ec 0D(Outdoor Unit Malfunction Diagnosis And Solution)

    Check the fastening screws on the PCB and IPM radiator. Replace the outdoor Are they fixed tightly? control PCB. Tighten the screws and apply silicon grease. 8.12 EC 0d(Outdoor unit malfunction Diagnosis and Solution) Description: The indoor unit detect the outdoor unit is error. Recommended parts to prepare: •...

  • Page 77: Pc 40(Communication Error Between Outdoor Main Pcb And Ipm Board Diagnosis And Solution)

    8.13 PC 40(Communication error between outdoor main PCB and IPM board diagnosis and solution) Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: • Connection wires • IPM board • Outdoor main PCB • Electric control box Troubleshooting and repair: Is there at least one LED in Is there at least one LED in...

  • Page 78: Pc 08(Current Overload Protection)/Pc 44(Outdoor Unit Zero Speed Protection)/ Pc

    8.14 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 Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: •...
  • Page 79 Was the protection activated Was the protection activated in standby? in standby? Restart the unit when the power supply Restart the unit when the power supply Is the power voltage is normal? Is the power voltage is normal? returns to normal returns to normal Is outdoor terminal voltage Is the power wiring...

  • Page 80: Pc 0F ( Pfc Module Protection Diagnosis And Solution)

    8.15 PC 0F PFC module protection diagnosis and solution) Description: When the voltage signal that IPM send to compressor drive chip is abnormal, the LED displays the failure code and the AC turns off. Recommended parts to prepare: • Connection wires •...

  • Page 81: Ec 72 (Lack Phase Failure Of Outdoor Dc Fan Motor Diagnosis And Solution)

    8.16 EC 72 (Lack phase failure of outdoor DC fan motor diagnosis and solution) Description: When the three-phase sampling current of the DC motor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code. Recommended parts to prepare: •...

  • Page 82: Pc 43 (Outdoor Compressor Lack Phase Protection Diagnosis And Solution)

    8.17 PC 43 (Outdoor compressor lack phase protection diagnosis and solution) Description: When the three-phase sampling current of the compressor is abnormal, especially when the current of one or more phases is always small and almost 0, the LED displays the failure code Recommended parts to prepare: •...

  • Page 83: Pc 45 (Outdoor Unit Ir Chip Drive Failure Diagnosis And Solution)

    8.18 PC 45 (Outdoor unit IR chip drive failure diagnosis and solution) Description: When the IR chip detects its own parameter error, the LED displays the failure code when power on. Recommended parts to prepare: • Inverter module PCB. Troubleshooting and repair: Power off,then restart the unit 2 minutes later.

  • Page 84: Pc 30 (High Pressure Protection Diagnosis And Solution)

    8.21 PC 30 (High pressure protection diagnosis and solution) Description: Outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa Recommended parts to prepare: • Connection wires • Pressure switch • Outdoor fan • Outdoor main PCB Troubleshooting and repair: ...
  • Page 85 High pressure protection High pressure protection Are the high pressure switch Are the high pressure switch Connect high pressure switch and Connect high pressure switch and and main control boar wired and main control boar wired mian control board mian control board correctly? correctly? Is the high pressure...

  • Page 86: Pc 0A (High Temperature Protection Of Condenser Diagnosis And Solution)

    8.22 PC 0A (High temperature protection of condenser diagnosis and solution) Description: When the outdoor pipe temperature is more than 65°C, the unit stops. It starts again only when the outdoor pipe temperature is less than 52°C. Recommended parts to prepare: •...

  • Page 87: Pc 06 (Discharge Temperature Protection Of Compressor Diagnosis And Solution)

    8.23 PC 06 (Discharge temperature protection of compressor diagnosis and solution) Description: If the compressor discharge temperature exceeds a certain level for nine seconds, the compressor ceases operation, the LED displays the failure code Recommended parts to prepare: • Connection wires •...
  • Page 88 8. Check Procedures 8.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury. 1. Disconnect temperature sensor from PCB (Refer to Chapter 5. Indoor Disassembly and Chapter 6. Outdoor Disassembly). 2.
  • Page 89 ATQ420D1TMU ATQ420D1UMU KTQ420D1UMU ATF235D22TMT Resistance Value KSN140D21UFZ ATQ420D1SN5A1 ATF250D22UMT ATH307CDRC8DUL KTQ420D41SN5A1 Blue-Red Blue-Black 0.37Ω 1.28Ω 0.75Ω Red-Black Resistance Value KTM240D57UMT KTM240D43UKT KTM240D46UKT2 KTF310D43UMT Blue-Red Blue-Black 0.62Ω 1.03Ω 1.04Ω 0.65Ω Red-Black Note: The picture and the value are only for reference, actual condition and specific value may vary. ...
  • Page 90 8.3 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1. Turn off outdoor unit and disconnect power supply. 2. Discharge electrolytic capacitors and ensure all energy-storage unit has been discharged. 3.
  • Page 91 Note: The picture and the value are only for reference, actual condition and specific value may vary. 8.4 Normal voltage of P and N 208-240V(1-phase,3-phase) 380-415V(3-phase) In standby around 310VDC around 530VDC In operation With passive PFC module With partial active PFC With fully active PFC module module...
  • Page 92  Page 88 ...
  • Page 93 Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..90 Temperature Sensor Resistance Value Table for TP (for some units)(°C --K) ...91 iii) Pressure On Service Port ..................92...
  • Page 94 i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731...
  • Page 95 ii) Temperature Sensor Resistance Value Table for TP(for some units) (°C --K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm...
  • Page 96 iii) Pressure On Service Port Cooling chart(R32): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 10.3 10.8 75/63 (23.89/17.22) 10.9 11.4 80/67 (26.67/19.44) 11.4 12.1 90/73 (32.22/22.78) 10.7 10.5 10.2 10.8 12.6 13.3 70/59 (21.11/15) 75/63 (23.89/17.22)
  • Page 97 Heating chart(R32): ODU(DB/WB) 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) IDU(DB) 55(12.78) 30.9 29.1 25.8 23.3 21.2 18.9 16.8 65(18.33) 33.2 30.6 27.1 25.9 23.8 20.9 19.4 75(23.89) 34.5 32.1 28.4 26.8 25.4 21.9...
  • Page 98 System Pressure Table-R32 Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.909 -61.436 1850 18.5 268.25 28.425 83.165 21.75 -43.635 -46.543 1900 275.5 29.447 85.005 -37.323 -35.181 1950 19.5 282.75 30.448 86.806 36.25 -32.15 -25.87 2000 31.431 88.576 43.5 -27.731 -17.916 2050...

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