INVENTOR V5MLO32-12 Service Manual
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INVENTOR V5MLO32-12 Service Manual

Lcac air conditioning systems
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AIR CONDITIONING SYSTEMS
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Summary of Contents for INVENTOR V5MLO32-12

  • Page 1 AIR CONDITIONING SYSTEMS LCAC • SERVICE MANUAL ENGLISH...
  • Page 2 Contents Part 1 General Information ....................1 Part 2 Indoor Units ......................... 6 Part 3 Outdoor Units ......................18 Part 4 Installation ....................... 23 Part 5 Electrical Control System ..................44 ※The specifications, designs, and information in this book are subject to change without notice for product improvement.
  • Page 3 General Information Part 1 General Information 1. Model Lists ................... 2 2. External Appearance ................3 2.1 Indoor Units ....................... 3 2.2 Outdoor Units ......................4 General Information...
  • Page 4 Model Lists 1. Model Lists 1.1 Indoor Units R410A (capacity multiplied by 1000Btu/h) Type Function ● Console ● 1.2 Outdoor Units Universal Outdoor unit Model Compressor type Compressor Brand Matched indoor units V5MLO32-12 Rotary GMCC V5MLI32-12 General Information...
  • Page 5 External Appearance 2. External Appearance 2.1 Indoor Units Console General Information...
  • Page 6 External Appearance 2.2 Outdoor Units Single fan outdoor unit General Information...

  • Page 7: Table Of Contents

    Console Type Console Type 1. Features ..................... 6 2. Dimensions ..................9 3. Service Space ..................10 4. Wiring Diagrams ................11 5. Air Velocity and Temperature Distributions (Reference Data) ..13 6. Electric Characteristics ..............14 7. Sound Levels ..................15 8.

  • Page 8: Features

    Features 1. Features 1.1. Modern and elegant appearance The simple and stylish designs can nicely harmonies with your living space.  1.2. Four panels optional 1.3. Two air-outlet ways Cooling mode Quick Cooling To maintain room temp Air outlet from top and bottom to make quick cooling ------When the A/C is just switched on, or room ...
  • Page 9 Features Anti-cold air ------When the AC is just turn on, temperature of evaporator is very low, in this case, in  order to prevent cold air direct blowing, only the upper louver is opened in a high position, the lower louver closed.
  • Page 10 Features 1.7. Active carbon filter is standard. Console Type...

  • Page 11: Dimensions

    Console Type 2. Dimensions 2 1 0 7 0 0 H a n g in g a r m 1 9 5 D r a i n p i p e U n it : m m Console Type...

  • Page 12: Service Space

    Console Type 3. Service Space Console Type...

  • Page 13: Wiring Diagrams

    Console Type 4. Wiring Diagrams V5MLI32-12 4.1 Micro-Switch Introduce: A. Micro-switch SW1 is for selection of auto-restart function. Range: Active, inactive B. Take off the panel, you can see the switch SW101 which is used for selecting both air outlets or upper air outlet only. Console Type...
  • Page 14 Console Type C.Micro-switch SW102 is for selection of temperature compensation in heating mode. This helps to reduce the real temperature difference between ceiling and floor so that the unit could run properly. If the unit is on-floor installed, 0 should be chosen. Range: E function (reserved for special customizing) /0 C, 2 C, 4...

  • Page 15: Air Velocity And Temperature Distributions (Reference Data)

    Console Type 5. Air Velocity and Temperature Distributions (Reference Data) A i r f l o w v e l o c i t y T e m p e r a t u r e Console Type...

  • Page 16: Electric Characteristics

    Console Type 6. Electric Characteristics Indoor Units Power Supply Model Voltage Min. Max. V5MLI32-12 220-240V 198V 254V Console Type...

  • Page 17: Sound Levels

    Console Type 7. Sound Levels M ic r o p h o n e 1 . 5 m Noise level dB(A) Noise Power Model dB(A) V5MLI32-12 Console Type...

  • Page 18: Accessories

    Console Type 8. Accessories Name Shape Quantity Hook Installation fittings Remote controller Frame Remote controller & Its Frame Mounting screw(ST2.9×10-C-H) Alkaline dry batteries (AM4) Installation manual Others Owner's manual 9. The Specification of Power Model(Btu/h) 12000 16000 Phase 1-phase 1-phase POWER Frequency and Voltage 220-240V, 50Hz...

  • Page 19: Field Wiring

    Console Type 10. Field Wiring Console Type...
  • Page 20 Outdoor Units Part 3 Outdoor Units 1. Dimensions ..............19 2. Service Space ............... 20 3. Wiring Diagrams ............21 4. Piping Diagrams ............22 5. Electric Characteristics ..........23 6. Operation Limits ............24 7. Sound Levels ..............25 Outdoor Units...

  • Page 21: Dimensions

    Dimensions 1. Dimensions Unit：mm Model(KBtu/h) 12/16/18 30/36/42 1030 Outdoor Units...

  • Page 22: Service Space

    Service Space 2. Service Space (Wall or obstacle) More than 30cm Air inlet More than 60cm More than 30cm Maintain channel Air inlet More than 60cm Air outlet More than 200cm Outdoor Units...

  • Page 23: Wiring Diagrams

    Wiring Diagrams 3. Wiring Diagrams V5MLO32-12 Outdoor Units...

  • Page 24: Piping Diagrams

    Piping Diagrams 4. Piping Diagrams V5MLO32-12, I N D O O R O U T D O O R E le c t r o n ic C A P I L I A R Y T U B E...

  • Page 25: Electric Characteristics

    Electric Characteristics 5. Electric Characteristics Power Outdoor Unit Supply Model Voltage Min. Max. 254V V5MLO32-12 220-240V 198V Notes: MFA: Max. Fuse Amps. (A) Outdoor Units...

  • Page 26: Operation Limits

    Operation Limits 6. Operation Limits Temperature Cooling operation Heating operation Drying operation Mode Room temperature 17℃～32℃ 0℃～30℃ 17℃～32℃ 0℃～50℃ （-15℃～50℃：For Outdoor temperature -15℃～24℃ 0℃～50℃ the models with low temperature cooling system） CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally.

  • Page 27: Sound Levels

    Sound Levels 7. Sound Levels Outdoor Unit Microphone 1.0m Note: H= 0.5 × height of outdoor unit Model Noise Power dB(A) Noise level dB(A) V5MLO32-12 Outdoor Units...
  • Page 28 Installation Part 4 Installation 1. Installation Procedure ..........27 2. Location selection ............28 3. Indoor unit installation ..........29 4. Outdoor unit installation (Side Discharge Unit) ..30 5. Refrigerant pipe installation ........31 6. Drainage pipe installation ..........35 7.

  • Page 29: Installation Procedure

    Installation Procedure 1. Installation Procedure Indoor unit installation Outdoor unit installation location selection location selection Indoor unit installation Outdoor unit installation Refrigerant pipe Refrigerant pipe installation and insulation installation and insulation Drainage pipe installation Drainage pipe installation and insulation and insulation Vacuum drying and leakage checking Additional refrigerant charge Insulation the joint part of refrigerant pipe...

  • Page 30: Location Selection

    Location selection 2. Location selection 2.1 Indoor unit location selection  The place shall easily support the indoor unit’s weight.  The place can ensure the indoor unit installation and inspection.  The place can ensure the indoor unit horizontally installed. ...

  • Page 31: Indoor Unit Installation

    Indoor unit installation 3 Console indoor unit installation 3.1 Service space for indoor unit 3.2 Install the main body Fix the hook with tapping screw onto the wall  Hang the indoor unit on the hook.  (The bottom of body can touch with floor or suspended, but the body must install vertically.) Installation...

  • Page 32: Outdoor Unit Installation (Side Discharge Unit)

    Outdoor unit installation (Side Discharge Unit) 4. Outdoor unit installation (Side Discharge Unit) 4.1 Service space for outdoor unit (Wall or obstacle) More than 30cm Air inlet More than 60cm More than 30cm Maintain channel Air inlet More than 60cm Air outlet More than 200cm 4.2 Bolt pitch...

  • Page 33: Refrigerant Pipe Installation

    Refrigerant pipe installation 5. Refrigerant pipe installation 5.1 Maximum pipe length and height drop Considering the allowable pipe length and height drop to decide the installation position. Make sure the distance and height drop between indoor and outdoor unit not exceeded the date in the following table. Model Max.
  • Page 34 Refrigerant pipe installation Flare dimension A (mm) Pipe diameter Flare shape 9 0 ° 4 1/4" (6.35) 3/8" (9.52) 12.0 12.4 R 0 . 4 ~ 0 . 8 1/2" (12.7) 15.4 15.8 5/8" (15.9) 18.6 19.1 3/4" (19) 22.9 23.3 After flared the pipe, the opening part must be seal by end cover or adhesive tape to avoid duct or ...
  • Page 35 Refrigerant pipe installation Note: All used branch pipe must be produced by Inventor, otherwise it causes malfunction. The indoor units should be installed equivalently at the both side of the U type branch pipe. Permitted Value Piping 18K+18K Total pipe length (Actual)
  • Page 36 Refrigerant pipe installation Installation...

  • Page 37: Drainage Pipe Installation

    Drainage pipe installation 6. Drainage pipe installation Install the drainage pipe as shown below and take measures against condensation. Improperly installation could lead to leakage and eventually wet furniture and belongings. 6.1 Installation principle Ensure at least 1/100 slope of the drainage pipe ...
  • Page 38 Drainage pipe installation 6.2.3 Individual design of drainage pipe system The drainage pipe of air conditioner shall be installed separately with other sewage pipe, rainwater pipe  and drainage pipe in building. The drainage pipe of the indoor unit with water pump should be apart from the one without water pump. ...
  • Page 39 Drainage pipe installation I n d o o r u n it M o r e th a n 5 0 m m P lu g M o r e th a n 2 5 m m W a t e r s to r a g e p ip e 6.2.7 Lifting pipe setting of indoor unit with water pump The length of lifting pipe should not exceed the pump head of indoor unit water pump.
  • Page 40 Drainage pipe installation 6.3 Drainage test 6.3.1 Water leakage test After finishing the construction of drainage pipe system, fill the pipe with water and keep it for 24 hours to check whether there is leakage at joint section. 6.3.2 Water discharge test Natural drainage mode(the indoor unit with outdoor drainage pump) Infuse above 600ml water through water test hole slowly into the water collector, observe whether the water can discharge through the transparent hard pipe at drainage outlet.

  • Page 41: Vacuum Drying And Leakage Checking

    Vacuum Drying and Leakage Checking 7. Vacuum Drying and Leakage Checking 4.1 Purpose of vacuum drying Eliminating moisture in system to prevent the phenomena of ice-blockage and copper oxidation.  Ice-blockage shall cause abnormal operation of system, while copper oxide shall damage compressor. Eliminating the non-condensable gas (air) in system to prevent the components oxidizing, pressure ...

  • Page 42: Additional Refrigerant Charge

    Additional refrigerant charge 8. Additional refrigerant charge After the vacuum drying process is carried out, the additional refrigerant charge process need to be  performed. The outdoor unit is factory charged with refrigerant. The additional refrigerant charge volume is decided ...

  • Page 43: Engineering Of Insulation

    Engineering of insulation 9. Engineering of insulation 9.1 Insulation of refrigerant pipe 9.1.1 Operational procedure of refrigerant pipe insulation Cut the suitable pipe → insulation (except joint section) → flare the pipe → piping layout and connection→ vacuum drying → insulate the joint parts 9.1.2 Purpose of refrigerant pipe insulation During operation, temperature of gas pipe and liquid pipe shall be over-heating or over-cooling ...

  • Page 44: Engineering Of Electrical Wiring

    Engineering of electrical wiring 9.2.3 Insulation material selection for drainage pipe The insulation material should be flame retardant material, the flame retardancy of the material should  be selected according to the local law. Thickness of insulation layer is usually above 10mm. ...

  • Page 45: Test Operation

    Test operation 11. Test operation 11.1 The test operation must be carried out after the entire installation has been completed. 11.2 Please confirm the following points before the test operation. The indoor unit and outdoor unit are installed properly.  Tubing and wiring are correctly completed.
  • Page 46 Electrical Control System Part 5 Electrical Control System 1. Electrical Control Function ........45 2. Troubleshooting ............56 Electrical Control System...
  • Page 47 Electrical Control Function 1. Electrical Control Function 1.1 Abbreviation T1: Indoor room temperature T2: Middle indoor heat exchanger coil temperature T2B: Indoor heat exchanger exhaust coil temperature T3: Outdoor heat exchanger pipe temperature T4: Outdoor ambient temperature T5: Compressor discharge temperature 1.2 Main Protection 1.2.1 Compressor three-minute delay at restart Compressor functions are delayed for up to one minute upon the first startup of the unit, and are delayed for...
  • Page 48 Electrical Control Function 0： No malfunction 1：P0 Overcurrent 2：Overpressure 3：Overload 4：Over speed 5：Startup malfunction 6：Lack of phase 7：DC voltage too low 8：Communication fault 9：Parameter fault 10：L3 Current limited 11：L5 Voltage limited 12: Target speed cannot be met during the static pressure calculation process. For other models: If the indoor fan speed is lower than 300 RPM for 50 seconds or more, it shuts off and restarts in 30 seconds.
  • Page 49 Electrical Control Function 1.3 Operation Modes and Functions 1.3.1 Fan Mode (1) Outdoor fan and compressor cease operation. (2) Temperature setting function is disabled, and no preset temperature is displayed. (3) Louver operates the same as in cooling mode. (4) Auto fan: When it fan-only mode, operates the same as auto fan in cooling mode with the temperature set at 24℃.
  • Page 50 Electrical Control Function 16~60K 1.3.2.3 Indoor Fan Running Guidelines In cooling mode, the indoor fan runs continuously and You can select the following speeds: high, medium, low, auto or silent. When the compressor is running, The indoor fan is regulated as illustrated as in the following figure: Setting fan T1-Td ℃(°F)
  • Page 51 Electrical Control Function 1.3.2.4 High Condenser Coil Temperature Protection 16~60K O f f O f f D e c r e a s e D e c r e a s e H o ld H o ld R e s u m e I n c r e a s e s lo w ly R e s u m e 1.3.3 Heating Mode...
  • Page 52 Electrical Control Function 1.3.3.2 Indoor Fan Running Guidelines In heating mode, indoor fan speed can be set at high, medium, low, or auto fan, and the anti-cold-wind function is preferential. When the compressor is running, The indoor fan is regulated as illustrated as in the following figure: Setting fan T1-Td℃...
  • Page 53 Electrical Control Function O f f T E s t o p D e c r e a s e T E d o w n H o ld T E n o r m R e s u m e Off: Compressor stops.
  • Page 54 Electrical Control Function 1.3.6.6 The timer does not change the unit operation mode. If the unit is off now, it does not start up immediately after the “timer off” function is set. When the setting time is reached, the timer LED switches ioff and the unit running mode remains unchanged.
  • Page 55 Electrical Control Function 1.3.11 Outdoor Unit Point Check Function(Excluding 12K&16K) A check switch is included on the outdoor PCB. Push SW1 to check the unit's status while running. The digital display shows the following codes each time the SW1 is pushed. Display Remark Normal display...
  • Page 56 Electrical Control Function 0 ： Off, 1: Turbo, 2: High, 3: Medium, 4: Low, DC fan motor speed Breeze, 6: Supper breeze The display value is between 0–30 ℃. If the temperature is higher than 99 ℃, the digital display shows single and double digits.
  • Page 57 Electrical Control Function If the temperature is lower than 0 ℃, the digital display shows “0”. If the temperature is higher than 70 ℃, the digital display shows “70”. T2B of #2 indoor unit If the capacity demand is 0, the digital display shows “0”. If the indoor unit is not connected, the digital display shows: “――”...
  • Page 58 Troubleshooting 2. Troubleshooting 2.1 Display board Icon explanation on indoor display board (Console) Electrical Control System...
  • Page 59 Troubleshooting 2.2 Indoor Unit Malfunctions For the Console Operation Lamp Malfunction Timer Lamp (flashes) Indoor EEPROM malfunction Communication malfunction between indoor and outdoor units Indoor fan speed malfunction T1 temperature sensor open or short circuit T2 temperature sensor open or short circuit Refrigerant leakage Overcurrent protection (for some units) T4 temperature sensor open or short circuit...
  • Page 60 Troubleshooting 2.4 Resolving Typical Malfunctions 2.4.1 For Indoor Units 2.4.1.1 Temperature Sensor Open or Short Circuit If the sampling voltage is lower than 0.06V or higher than 4.94V, Malfunction conditions the LED will display the failure. ● Wiring mistakes Possible causes ●...
  • Page 61 Troubleshooting 2.4.1.3. Indoor EEPROM Malfunction Main PCB chip does not receive feedback from EEPROM chip Malfunction conditions ● Installation mistakes Possible causes ● Faulty PCB Power off, then restart the unit 2 minutes later. Does a problem remain? Replace the indoor main PCB EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 62 Troubleshooting 2.4.1.5. Indoor Fan Speed Malfunction When indoor fan speed continues to run at too low a speed (300RPM) for a Malfunction conditions certain period of time, the unit will stop and the LED will display a failure code. ● Wiring mistakes Possible causes ●...
  • Page 63 Troubleshooting DC motor voltage input and output Color Signal Voltage Vs/Vm 200V~380V Black White 13.5-16.5V Yellow 0~6.5V Blue 13.5-16.5V 2. Indoor or outdoor DC Fan Motor (control chip is in PCB) Release the UVW connector. Measure the resistance of U-V, U-W, and V-W. If the resistances are not equal to each other, the fan motor may be experiencing problems and need to be replaced.
  • Page 64 Troubleshooting 2.4.1.6. Refrigerant Leakage Detection Malfunction conditions Define the evaporator coil temperature T2 of the compressor starts running as Tcool. If the following occurs 3 times, the display shows "EC" and the unit switches off: In the first 8 minutes after the compressor starts up, if T2 ＜Tcool－2℃ is not maintained for 4 seconds and compressor running frequency is not higher than 50Hz for 3 minutes Potential causes...
  • Page 65 Troubleshooting 2.4.1.7 Outdoor IGBT sensor is faulty Check the connection between temperature Ensure proper connection sensor and PCB. Is it properly wired? Measure the resistance value of the sensor. Is it Replace the sensor within acceptable parameters? Replace outdoor main PCB 2.4.1.8 Communication malfunction between indoor and outdoor units The same as E1 in outdoor.
  • Page 66 Troubleshooting 2.4.4 Outdoor Units 2.4.4.1. Compressor Driven Chip EEPROM Malfunction Main PCB chip does not receive feedback from EEPROM chip Malfunction conditions Possible causes ● Installation mistakes ● Faulty PCB Compressor driven chip Compressor driven chip EEPROM malfunction EEPROM malfunction Power off, then restart the Power off, then restart the unit 2 minutes later.
  • Page 67 Troubleshooting 2.4.4.2 Compressor Speed Malfunction/ Zero Speed Protection / Synchronous Fault Protection LED1(Green) off/LED2(Red) flash LED1(Green) off/LED2(Red) flash or LED1(Green) flash/LED2(Red) on or LED1(Green) flash/LED2(Red) on Is there at least one LED in Is there at least one LED in the compressor driven chip the compressor driven chip light?
  • Page 68 Troubleshooting 2.4.4.3 MCE Malfunction MCE malfunction MCE malfunction Power off, then restart the Power off, then restart the unit 2 minutes later. Does a unit 2 minutes later. Does a problem still exist? problem still exist? Replace the outdoor main PCB Replace the outdoor main PCB Electrical Control System...
  • Page 69 Troubleshooting 2.4.4.4. E1 malfunction Current loop communication: Indoor unit does not receive feedback from outdoor unit for 110 Malfunction seconds. This occurs 4 times in a row. conditions ● Wiring mistakes Possible causes ● Faulty indoor or outdoor PCB Power off, then restart the unit 2 minutes later. Power off, then restart the unit 2 minutes later.
  • Page 70 Troubleshooting For 485 Communication Indoor unit does not receive feedback from outdoor unit for 60 Malfunction seconds OR outdoor unit does not receive feedback from indoor unit conditions for 120 seconds. ● Wiring mistakes Possible causes ● Faulty indoor or outdoor PCB E1 displayed E1 displayed Communication malfunction between indoor...
  • Page 71 Troubleshooting 2.4.4.5. F0 Malfunction Malfunction conditions If the outdoor current exceeds the current limit value, the LED displays a failure code. Wiring mistakes ● Possible causes Faulty bridge rectifier ● System blockages ● ● Faulty outdoor PCB Electrical Control System...
  • Page 72 Troubleshooting F0 displayed F0 displayed Current protection of compressor Current protection of compressor Was the protection activated Was the protection activated in standby? in standby? Is the power voltage is Restart the unit when the power Is the power voltage is Restart the unit when the power normal? supply returns to normal...
  • Page 73 Troubleshooting 2.4.4.6. F1, F2, F3 Malfunction Error E4 displayed E4 displayed Judge 1: Outdoor condenser temp. sensor (T3) is malfunctioning Judge 1: Outdoor condenser temp. sensor (T3) is malfunctioning Is the wiring of the condenser temp. Reconnect the condenser Is the wiring of the condenser temp. Reconnect the condenser sensor (T3) not connected properly? temp.
  • Page 74 Troubleshooting 2.4.4.7. F4 Malfunction Main PCB chip does not receive feedback from EEPROM chip Malfunction conditions Possible causes ● Installation mistakes ● Faulty PCB F4- Display F4- Display Outdoor EEPROM malfunction Outdoor EEPROM malfunction Power off, then restart the Power off, then restart the unit 2 minutes later.
  • Page 75 Troubleshooting 2.4.4.9. P0 Malfunction When the voltage signal the IPM sends to compressor drive Malfunction conditions chip is not normal, the LED displays “P0” and the unit turns off. Wiring mistakes Possible causes ● Faulty IPM board ● Faulty outdoor fan assembly ●...
  • Page 76 Troubleshooting P0 displayed P0 displayed IPM module protection IPM module protection Restart the unit when the power supply Restart the unit when the power supply Is the power voltage normal? Is the power voltage normal? returns to normal returns to normal Is the outdoor terminal voltage Are the power wires Reconnect the power...
  • Page 77 Troubleshooting 2.4.4.10. P1 malfunction An abnormal voltage rise or drop is detected by checking the Malfunction decision specified voltage detection circuit. conditions Abnormal power supply  Supposed causes Wiring mistake  Faulty bridge rectifier  board  Faulty IPM P1 display P1 display Voltage protection Voltage protection...
  • Page 78 Troubleshooting 2.4.4.11. P4 Malfunction The troubleshooting is same as the “ ” IPM module protection 2.4.4.12. J0 Malfunction Malfunction conditions When evaporator coil temperature is more than 60°C, the unit stops. It starts again only when the evaporator coil temperature is less than 54°C ...
  • Page 79 Troubleshooting 2.4.4.13. J1 Malfunction Malfunction conditions 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. Faulty condenser temperature sensor Possible causes ● Dirty heat exchanger ●...
  • Page 80 Troubleshooting 2.4.4.14. J2 Malfunction Malfunction conditions When the compressor discharge temperature (T5) is more than 115℃ for 10 seconds, the compressor will stop and not restart until T5 is less than 90℃. Refrigerant leakage Possible causes ● Wiring mistake ● Faulty discharge temperature sensor ●...
  • Page 81 Troubleshooting 2.4.4.15. J3 Malfunction When the voltage signal that IPM send to compressor drive Malfunction decision chip is abnormal, the display LED will show “J3” and AC will conditions turn off. Wiring mistake Supposed causes ● Faulty IPM board ● Faulty outdoor fan assembly ●...
  • Page 82 Troubleshooting 2.4.4.16. J4 Malfunction J4 displayed J4 displayed Communication error between outdoor main Communication error between outdoor main chip and compressor driven chip chip and compressor driven chip Is there at least one LED in the Is there at least one LED in the compressor driven chip light? compressor driven chip light? Check the signal wire between the...
  • Page 83 Troubleshooting 2.4.4.17. J5 Malfunction If the sampling voltage is not 5V, the LED displays a failure Malfunction conditions code. Wiring mistakes ● Possible causes Faulty overload protector ● System blockages ● ● Faulty outdoor PCB J5 displayed J5 displayed High pressure protection High pressure protection Are the high pressure Are the high pressure...
  • Page 84 Troubleshooting 2.4.4.18. P6/J6 Malfunction If the sampling voltage is not 5V, the LED displays a failure Malfunction conditions code. Wiring mistake ● Possible causes Faulty over load protector ● System blockages ● ● Faulty outdoor PCB Electrical Control System...
  • Page 85 Troubleshooting P6/J6 displayed P6/J6 displayed Low pressure protection Low pressure protection Reconnect the low pressure Are the low pressure Are the low pressure Reconnect the low pressure protector and main control protector and main control protector and main control protector and main control board wired properly? board wired properly? board...
  • Page 86 Troubleshooting 2.4.4.19. J8 malfunction An abnormal voltage rise or drop is detected by checking the Malfunction decision specified voltage detection circuit. conditions Abnormal power supply  Supposed causes Wiring mistake  Faulty bridge rectifier  board  Faulty IPM J8 display J8 display AC power input voltage AC power input voltage...
  • Page 87 Troubleshooting 2.4.4.20. P2 malfunction If the sampling voltage is not 5V, the LED will display the failure. Malfunction decision conditions Faulty overload protector Supposed causes ● Wiring mistake ● System leakage or block ● Faulty PCB ● Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units.
  • Page 88 Troubleshooting Appendix 1 Temperature Sensor Resistance Value Table (℃--K) ℃ ℃ ℃ ℃ K Ohm K Ohm K Ohm K Ohm 12.6431 2.35774 0.62973 115.266 108.146 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...
  • Page 89 Troubleshooting Appendix 2 Unit: ℃---K Discharge temperature 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 90 Troubleshooting Appendix 3 Normal voltage of P and N 208-240V(1-phase,3-phase) 380-415V(3-phase) In standby 310VDC around around 530VDC In operation With passive PFC With partial active With fully active module PFC module PFC module >200VDC >310VDC >370VDC >450VDC Electrical Control System...
  • Page 91 AIR CONDITIONING SYSTEMS LCAC Scan here to download the latest version of this manual.

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