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  • Page 3: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................1 In case of Accidents or Emergency Pre-Installation and Installation Operation and Maintenance 2. Specifications ....................3 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 15 Operation Modes and Functions 4. Maintenance and Disassembly ..............22 Maintenance Disassembly 5.

  • Page 5: Safety Precautions

    Safety Precautions Contents In Case of Accidents or Emergency ..............2 Pre-Installation .......................2 Operation and Maintenance .................2...

  • Page 6: In Case Of Accidents Or Emergency

    To prevent personal injury, or property or unit damage, CAUTION adhere to all precautionary measures and instructions • • While unpacking be careful of sharp edges around outlined in this manual. Before servicing a unit, refer to this the unit as well as the edges of the fins on the con- service manual and its relevant sections.

  • Page 7: Specifications

    Specifications Contents Model Reference ....................4 Electrical Wiring Diagrams ..................5 Indoor Unit ....................5 Outdoor Unit ....................7...

  • Page 8: Model Reference

    1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply PIAW9169A PIAW9170B 115V~, 60Hz, 1Phase PIAW12169A PIAW12170B PIAW12179A...

  • Page 9: Electrical Wiring Diagrams

    2. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger Middle ...
  • Page 10 PIAW9169A, PIAW12169A, PIAW12179A, PIAW18179A, PIAW24179A, PIAW30179A, PIAW36179A 16022000019694 O PTI O N AL Y/ G I O N CN12_1 CN12_2 H EATER CN6_1 CN6_2 OPTIONAL INDOOR WIRING DIAGRAM OPTIONAL  Page 6 ...

  • Page 11: Outdoor Unit

    Outdoor Unit Abbreviation Paraphrase 4-WAY Gas Valve Assembly/4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Current FAN AC Current Detector COMP Compressor L-PRO Low Pressure Switch H-PRO High Pressure Switch Coil Temperature of Condenser Outdoor Ambient Temperature Compressor Suction Temperature Compressor Discharge Temperature Electronic Expansive Valve PIAW9170B, PIAW12170B...
  • Page 12 PIAW12180B BLUE OR BLACK BROWN I N D O O R U N I T 4-WAY CRANKCASE HEATER HEATER BLUE BLACK CN 7 OPTIONAL: DC-FAN  Page 8 ...
  • Page 13 PIAW18180B,, PIAW24180B, Applicable to Applicable to the units adopting the units adopting DC motor only AC motor only HEATER 2 OPTIONAL： CN30 BLUE YELLOW （ ） OPTIONAL 16022000019211 OUTDOOR WIRING DIAGRAM PO W ER SUPPLY TO I N D O O R U N I T ...
  • Page 14 PIAW30180B, PIAW36180B Applicable to the units adopting DC motor only BLACK BLUE Applicable to the units adopting AC motor only CN20 CN33 CN42 CN43 BLAC K 4-WAY1 BLACK BLAC K BLUE DRIVER BOARD BLUE CN41 CN10 CN54 HEAT1 CN22 BLUE CN51 CN40 CN44...
  • Page 15 PCB board of PIAW9170B,PIAW12170B, PCB board of PIAW12180B  Page 11 ...
  • Page 16 PCB board of PIAW18180B, PIAW24180B,  Page 12 ...
  • Page 17 PCB board of PIAW30180B, PIAW36180B  Page 13 ...
  • Page 18 IPM board After power on, LED3(Green color) and LED2(Red color) will be flash if the unit has some problems。 Problems LED3(Green) LED3(Red) IU display standby for normal Operation normally IPM malfunction or IGBT over-strong current FLASH (2.5Hz) protection Over voltage or too low voltage protection EEPROM parameter error FLASH Inverter compressor drive error...

  • Page 19: Product Features

    Product Features Contents Operation Modes and Functions ................16 Abbreviation ....................16 Safety Features ....................16 Display Function ..................16 Fan Mode ....................17 Cooling Mode .....................17 Heating Mode (For heat pump models) ............17 Auto-mode ....................18 Drying Mode ....................18 Forced Operation Function ................18 1.10 Timer Function ....................18 1.11 Sleep Function .....................18 1.12 Auto-Restart Function ..................19 1.13 Refrigerant Leakage Detection ..............19...
  • Page 20 1. Operation Modes and Functions corresponding error code, allowing for emergency use. • When more than one temperature sensor is malfunctioning, the air conditioner ceases operation. Abbreviation Refrigerant leakage detection Unit element abbreviations This function is active only when mode is selected. It will detect if the compressor is being damaged by refrigerant Abbreviation Element...
  • Page 21 Fan Mode • When T3> TP3+5 for 5 seconds, the compressor will stop until T3< TP3-3. When fan mode is activated: 1.5.5 Evaporator Temperature Protection • The outdoor fan and compressor are stopped. When evaporator temperature drops below a configured •...
  • Page 22 1.6.5 Evaporator Temperature Protection • fan speed • sleeping mode When the evaporator temperature exceeds a preset protection value, the compressor stops. • Follow me Auto-mode 1.10 Timer function • This mode can be selected with the remote controller. • Timing range is 24 hours. •...
  • Page 23 automatically stores the current settings (not including sets the temperature according to the measurements the swing setting) and, in the case of a sudden power from the remote control. failure, will restore those setting automatically within 3 • The unit will only change modes if the information minutes after power returns.
  • Page 24 Displayed Displayed code Explanation Meaning Additional Notes value Room temperature 1. All displayed temperatures use actual values. Indoor coil temperature 2. All temperatures are -1F,-1E,-1d,-1c,- -25,-24,-23,-22, displayed in °C regardless Outdoor coil 1b,-1A -21,-20 of remote used. temperature -19—99 -19—99 3.
  • Page 25 Displayed Displayed code Explanation Meaning Additional Notes value Reserved 0-FF  Page 21 ...

  • Page 26: Maintenance And Disassembly

    Maintenance and Disassembly Contents Maintenance ......................23 First Time Installation Check ................23 Refrigerant Recharge ...................25 Re-Installation .....................26 1.3.1 Indoor Unit ..................26 1.3.2 Outdoor Unit ................28 Disassembly ......................30 Indoor Unit ....................30 Outdoor Unit ....................46...

  • Page 27: Maintenance

    1. Maintenance First Time Installation Check To prevent air and moisture from affecting the air Air and moisture trapped in the refrigerant system affects conditioner’s performance, the indoor unit, as well as the the performance of the air conditioner by: pipes between the indoor and outdoor unit, must be be •...
  • Page 28 Procedure: (14.5 Psi) after 50 minutes, check for leakage. Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed. (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.

  • Page 29: Refrigerant Recharge

    Refrigerant Recharge Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max. elevation Max. length Additional refrigerant 9k&12k 7.5m (24.6ft) 10m (32.8ft) 25m (82.0ft) 15g/m (0.16oz/ft) 7.5m (24.6ft) 20m (65.6ft) 30m (98.4ft) 15g/m (0.16oz/ft) 24k&30k...

  • Page 30: Re-Installation

    Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: (14.5 Psi). Confirm that the 2- and 3-way valves are opened. Close the 3-way valve so that the gauge rests Connect the charge hose with the push pin of Handle between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi).
  • Page 31 Air purging with vacuum pump Procedure: (14.5 Psi) after 50 minutes, check for leakage. Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed.

  • Page 32: Outdoor Unit

    1.3.2 Outdoor Unit Evacuation for the whole system Procedure: Wait for five 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 33 Refrigerant charging Procedure: Tighten the flare nuts of the indoor and outdoor and record the starting weight. units, and confirm that both the 2- and 3-way valves Fully open the Handle Lo manifold valve, 2- and are closed. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode and 3-way service port.

  • Page 34: Disassembly

    2. Disassembly Indoor unit Front Panel Procedure Illustration 1) Hold the front panel by the tabs on Front Panel the both sides and lift it (see CJ_AB_ INV_001). CJ_AB_INV_001 2) Push up the bottom of an air filter (step 1), and then pull it out downwards (step 2) (see CJ_AB_ INV_002).
  • Page 35 Procedure Illustration 3) Open the horizontal louver and push the hook towards left to open it (see CJ_AB_INV_003). Horizontal Louver Hook CJ_AB_INV_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AB_INV_004).
  • Page 36 Procedure Illustration 5) Pry the electrical cover by a screw driver, and rotate it towards left, then remove it. (see CJ_AB_INV_005). CJ_AB_INV_005 6) Disconnect the connector for display board. (see CJ_AB_INV_006) . CJ_AB_INV_006 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 37 Procedure Illustration 7) Slid the front panel side to side to release each axis (see CJ_AB_INV_007) CJ_AB_INV_007 8) Open the screw cap and then remove the 3 screws (see CJ_AB_INV_008). CJ_AB_INV_008 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 38 Procedure Illustration 9) Release the hooks with hands. (see CJ_AB_INV_009) CJ_AB_INV_009 10) Release the 5 hooks in the back (see CJ_AB_INV_010). Hooks CJ_AB_INV_010 11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger.
  • Page 39 Procedure Illustration 12) Release the 5 hooks of the vertical blades, then pull the vertical blades Hooks rightward and remove it (see CJ_AB_ INV_012). CJ_AB_INV_012 13) Remove 1 screw of the display board. (see CJ_AB_INV_013). 14) Rotate the display board in the direction shown in the right picture.
  • Page 40 Electrical parts (Antistatic gloves must be worn.) Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration Ground Screws 1) Cut the ribbon by a shear, then pull out the coil temperature sensor (T2) (see CJ_AB_INV_014).
  • Page 41 Procedure Illustration 4) Remove the fixed devices of the connectors (see CJ_AB_INV_016). CJ_AB_INV_016 CJ_AF_INV_011-1 5) Disconnect the connectors of fan motor, the step motor and the T2 sensor (see CJ_AB_INV_017). CJ_AB_INV_017 6) Open the left side plate of electronic control box (see CJ_AB_INV_018). CJ_AB_INV_018 Note: This section is for reference only.
  • Page 42 Procedure Illustration 7) Open the two clips on the front of the electric box. (see CJ_AB_INV_019) CJ_AB_INV_019 8) Open the upper cover plate of electronic control box (see CJ_AB_ INV_020). CJ_AB_INV_020 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 43 Procedure Illustration 9) Remove 1 screw and open the 2 clips along the direction indicated in right image (see CJ_AB_INV_021). CJ_AB_INV_021 Display board 10) Pull out the electrical main board along the direction indicated in right image to remove it (see CJ_AB_ INV_022).
  • Page 44 Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit (see CJ_AB_INV_023). Pipe Holder CJ_AB_INV_023 Screw 2) Remove the 1 screws on the evaporator located at the fixed plate (see CJ_AB_...
  • Page 45 Procedure Illustration 3) Release the hook on the evaporator (see CJ_AB_INV_025). CJ_AB_INV_025 4) Remote the one screw on the evaporator located at the fixed plate (see CJ_AB_ INV_026). CJ_AB_INV_026 5) Pull out the evaporator (see CJ_AB_ INV_027). CJ_AB_INV_027 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 46 Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and 3. Evaporator). before disassembling fan motor and fan. Procedure Illustration 1) Remove the two screws and remove the fixing board of the fan motor (see CJ_AB_ INV_028).
  • Page 47 Procedure Illustration 3) Remove the fixing screw (see CJ_AB_ INV_030). 4) Pull out the fan motor and fan assembly from the side. Fixing Screw CJ_AB_INV_030 Note: This section is for reference only. Actual unit appearance may vary.  Page 43 ...
  • Page 48 Step motor Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the two screws, then remove the stepping motor (see CJ_AB_INV_031). Stepping Motor CJ_AB_INV_031 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 49 Drain Hose Procedure Illustration 1) Rotate the fixed wire clockwise indicated in right image (see CJ_AB_INV_032). CJ_AB_INV_032 2) Pull up the drain hose to remove it (see CJ_AB_INV_033). CJ_AB_INV_033 Note: This section is for reference only. Actual unit appearance may vary. ...

  • Page 50: Outdoor Unit

    Outdoor unit Panel Plate PIAW9170B, PIAW12170B, PIAW12180B: Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_BA30_INV_001). CJ_BA30_INV_001 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 51 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_BA30_INV_003). Front Panel CJ_BA30_INV_003 5) Remove the screws of the rear net and then remove the rear net (2 screws) (see CJ_BA30_INV_004). CJ_BA30_INV_004 Note: This section is for reference only.
  • Page 52 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_BA30_INV_005). Right Panel CJ_BA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 48 ...
  • Page 53 PIAW18180B : Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_B30_INV_001). CJ_B30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 54 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (8 screws) (see CJ_B30_INV_003). Front Panel CJ_B30_INV_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_B30_ INV_004).
  • Page 55 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005). Right Panel CJ_B30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 51 ...
  • Page 56 PIAW24180B: Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (3 screws) (see CJ_CA30_INV_001). CJ_CA30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 57 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA30_INV_003). Front Panel CJ_CA30_INV_003 5) Remove the screws of water collecting Water Collecting Cover cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_INV_004).
  • Page 58 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_INV_005). Right Panel CJ_CA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 54 ...
  • Page 59 PIAW30180B, PIAW36180B: Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (2 screws) (see CJ_D30_INV_001). Big Handle CJ_D30_INV_001 3) Remove the screws of the top cover and then remove the top cover (4 Top Cover screws).
  • Page 60 Procedure Illustration 4) Remove the screws of the front right panel and then remove the front right panel (2 screws) (see CJ_D30_ INV_003). Front Right Panel CJ_D30_INV_003 5) Remove the screws of the front panel and then remove the front panel (9 screws) (see CJ_D30_INV_004).
  • Page 61 Procedure Illustration 6) Remove the screws of water collecting cover and then remove the water collecting cover (2 screw) (see CJ_ D30_INV_005). Water Collecting Cover CJ_D30_INV_005 7) Remove the screws of the right panel and then remove the right panel (8 screws) (see CJ_D30_INV_006).
  • Page 62 Fan disassembly (Antistatic gloves must be worn when you disassemble the electronic box.) Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. PIAW9170B, PIAW12170B, PIAW12180B, PIAW30180B, PIAW36180B: Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_001 ).
  • Page 63 Procedure Illustration 5) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_004 ). CJ_ODU_INV_004 6) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_005 ). 7) Remove the fan motor. Fan Motor CJ_ODU_INV_005 Note: This section is for reference only.
  • Page 64 PIAW18180B, PIAW24180B: Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_006 ). 2) Remove the fan. CJ_ODU_INV_006 D-cut Hook 3) Unfix the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_007 ). CJ_ODU_INV_007 Note: This section is for reference only.
  • Page 65 Procedure Illustration 4) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_008 ). CJ_ODU_INV_008 5) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_009 ). 6) Remove the fan motor. Fan Motor CJ_ODU_INV_009 Note: This section is for reference only.
  • Page 66 Electrical parts (Antistatic gloves must be worn.) Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. PIAW9170B, PIAW12170B, PIAW12180B, PIAW30180B, PIAW36180B: Procedure Illustration 1) Remove the connector for the compressor (see CJ_ODU_INV_010 ).
  • Page 67 PIAW18180B, PIAW24180B: Procedure Illustration 4-Way Valve 1) Remove the connector for the compressor (see CJ_ODU_INV_011 ). 2) Pull out the two blue wires connected with the four way valve (see CJ_ODU_ INV_011 ). Reactor 3) Pull out connectors of the condenser coil temp.
  • Page 68 Sound blanket WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top) (see CJ_ODU_INV_012 ).
  • Page 69 Four-way valve WARNING: Recover refrigerant from the refrigerant circuit before remove the four-way valve. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling four-way valve. Procedure Illustration 1) Heat up the brazed parts and then detach...
  • Page 70 Compressor WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor. Procedure Illustration 1) Remove the flange nut of terminal cover and remove the terminal cover (see CJ_ ODU_INV_014 ).
  • Page 71 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_016 ). CJ_ODU_INV_016 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_017 ). 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.

  • Page 72: Troubleshooting

    Troubleshooting Contents Safety Caution .....................70 General Troubleshooting ..................71 Error Diagnosis and Troubleshooting Without Error Code .......73 Remote maintenance ...................73 Field maintenance ..................74 Quick Maintenance by Error Code ..............79 Troubleshooting by Error Code ................80 Common Check Procedures.................80 E0/F4 (EEPROM parameter error) ..............82 E1 (Indoor and outdoor unit communication error) ........83 E2 (Zero crossing detection error diagnosis and solution) ......85 E3/F5 (Fan speed has been out of control diagnosis and solution) ....86...
  • Page 73 Contents 5.10 P1(Over voltage or too low voltage protection diagnosis and solution) ..94 5.11 P2(High temperature protection of IPM module diagnosis and solution) ..95 5.12 P4(Inverter compressor drive error diagnosis and solution) ......96 5.13 P6(Low pressure protection/High pressure protection(36k)/ High temperature protection of IPM module(<36k)diagnosis and solution) ..........98...

  • Page 74: Safety Caution

    1. Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. Electrolytic Capacitors For other models, connect discharge resistance (approx.100Ω 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor.

  • Page 75: 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: Operation Timer lamp...
  • Page 76 For other errors: The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading. Troubleshooting: Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement. If the unit responds, the display board requires replacement.

  • Page 77: Error Diagnosis And Troubleshooting Without Error Code

    3. 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 Page 75-76...

  • Page 78: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 77-78 Compressor will not start but fans run Page 77-78 Compressor and condenser (outdoor) fan will not start Page 77-78 Evaporator (indoor) fan will not start Page 77-78 Condenser (Outdoor) fan will not start Page 77-78 Unit runs, but shortly stops Page 77-78...
  • Page 79 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 80 Others ☆ ☆ ☆ ☆ ☆ ☆ ☆  Page 76 ...
  • Page 81 Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆...
  • Page 82 Refrigerant Circuit Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆...

  • Page 83: Quick Maintenance By Error Code

    4. Quick Maintenance by Error Code If you do not have the time to test whether 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 84: Troubleshooting By Error Code

    5. Troubleshooting by Error Code Common Check Procedures 5.1.1 Temperature Sensor Check 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.(Tp) sensor.
  • Page 85 5.1.3 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 resistance Normal resistance Digital tester Digital tester value value...

  • Page 86: E0/F4 (Eeprom Parameter Error)

    E0/F4 (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.

  • Page 87: E1 (Indoor And Outdoor Unit Communication Error)

    E1 (Indoor and outdoor unit communication error) Description: The indoor unit has not received feedback from the outdoor unit for 110 seconds, four consecutive times. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB • Faulty reactor Troubleshooting and repair: Power off, then restart the unit after 2 minutes.
  • Page 88 Remarks: • Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. • When AC is normal running, the voltage will move alternately between -25V to 25V. •...

  • Page 89: E2 (Zero Crossing Detection Error Diagnosis And Solution)

    E2 (Zero crossing detection error diagnosis and solution) Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Recommended parts to prepare: • Connection mistake • Faulty PCB Troubleshooting and repair: Check the connections and power supply.

  • Page 90: E3/F5 (Fan Speed Has Been Out Of Control Diagnosis And Solution)

    E3/F5(Fan speed is operating outside of the normal range) Description: When the indoor fan speed keeps too low (300RPM) for certain time, the unit will stop and the LED will display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure(F5).
  • Page 91 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. •...
  • Page 92 3. 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 has problems and need to be replaced.

  • Page 93: E4/E5/F1/F2/F3

    E4/E5/F1/F2/F3 (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 will display the failure. Recommended parts to prepare: • Wiring mistake • Faulty sensor •...

  • Page 94: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool. In the beginning 8 minutes after the compressor starts up, if T2<Tcool-1°C (Tcool-33.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...

  • Page 95: F0(Overload Current Protection Diagnosis And Solution)

    F0(Overload current protection diagnosis and solution) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: • Power supply problems. • System blockage • Faulty PCB • Wiring mistake • Compressor malfunction Troubleshooting and repair: Check the power supply.
  • Page 96 P0(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 “P0” and the AC turn off. Recommended parts to prepare: • Wiring mistake •...
  • Page 97 For 30K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below: Check whether the power voltage Restart the unit when the power supply gets is normal.

  • Page 98: P1(Over Voltage Or Too Low Voltage Protection Diagnosis And Solution)

    5.10 P1(Over voltage or too low voltage protection diagnosis and solution) Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: • Power supply issues • System leakage or blockage •...

  • Page 99: P2(High Temperature Protection Of Ipm Module Diagnosis And Solution)

    5.11 P2(High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than setting value, the LED displays this failure code. Recommended parts to prepare: • Faulty PCB • Connection problems Troubleshooting and repair: Check the fastening screws on the PCB and IPM radiator.

  • Page 100: P4(Inverter Compressor Drive Error Diagnosis And Solution)

    5.12 P4(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: • Wiring mistake •...
  • Page 101 For 336K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below: Check whether the power voltage Restart the unit when the power supply gets is normal.

  • Page 102: P6(Low Pressure Protection/High Pressure Protection(36K)/ High Temperature Protection Of Ipm Module(<36K)Diagnosis And Solution)

    P6(Low pressure protection/High pressure protection(36k model)/ High temperature protection of IPM module(<36k models) diagnosis and solution) Description: When the pressure of system reach a certain value, the low pressure protector will switch off. After the pressure resume to normal ,the protection code will disappear. Recommended parts to prepare: •...
  • Page 103 For 36k: Power off, then restart the unit after 2 minutes. Power off, then restart the unit after 2 minutes. Does a problem remain? The unit is operating normally Does a problem remain? The unit is operating normally Power on and set cooling mode Power on and set cooling mode Check pressure of gas valve Check pressure of gas valve...

  • Page 104: Appendix

    Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..101 Temperature Sensor Resistance Value Table for TP (°C --K) ......102 ∆T(°F)=(9∆T(°C))/5 ....................103 iii) Pressure On Service Port ...................104...

  • Page 105: I) Temperature Sensor Resistance Value Table For T1,T2,T3 And T4 (°C - K)

    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 106: Ii) Temperature Sensor Resistance Value Table For Tp (°C --K)

    ii) Temperature Sensor Resistance Value Table for TP (°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 542.7 68.66...

  • Page 107: T(°F)=(9∆T(°C))/5

    iii) ∆T(°F)=(9∆T(°C))/5 °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8 134.6 190.4 246.2 33.8...

  • Page 108: Iv) Pressure On Service Port

    iv) Pressure On Service Port(R410A) Cooling chart: °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) 70/59 10.1 10.6 75/63 10.7 11.2 80/67 11.2 11.9 90/73 10.5 10.3 10.0 10.6 12.4 13.0 °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89)
  • Page 109 Heating chart: 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) 30.3 28.5 25.3 22.8 20.8 18.5 16.5 32.5 30.0 26.6 25.4 23.3 20.5 19.0 33.8 31.5 27.8 26.3 24.9 21.5 20.0 57/53 47/43 37/33 27/23...

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