LG Single "A" Service Manual
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LG Single "A" Service Manual

Single "a" air conditioner, -inverter type
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See also: Svc Manual
Internal Use Only
http://biz.lgservice.com
Single "A" Air Conditioner
SVC MANUAL(General)
MODEL : Single "A"-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.

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  • Page 1 Internal Use Only http://biz.lgservice.com Single "A" Air Conditioner SVC MANUAL(General) MODEL : Single "A"-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    1. Self-diagnosis Function .....................78 2. Pump Down .........................80 3. Evacuation ........................81 4. Gas Charging.......................82 5. Cycle Part........................83 6. Electronic Parts......................84 - 1 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Part 1 General Information

    Part 1 General Information 1. Safety Precautions ......................3 2. Model Line up ........................6 3. Nomenclature........................8 - 2 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Safety Precautions

    Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock. - 3 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 4 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor. - 5 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    [UV18 NBC] [UV24 NBD] [UV30 NBD] AVNH366KLAD [UV36 NKD] Ceiling suspended AVNH426LLAD AVNH486LLAD AVNH606LLAD [UV42 NLD] [UV48 NLD] [UV60 NLD] - 6 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Outdoor Units

    Total capacity index of connectable 10.6 12.5 14.0 15.0 indoor units kBtu/h Power supply 3Ø, 380-415V, 50Hz Chassis ❈ Synchro available - 7 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Nomenclature

    Capacity code Model Type C : Cooling Only H : Heat Pump W: Inverter Heat Pump R410A Universal Outdoor Unit - 8 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Indoor Units

    W: Inverter No mark for non-inverter Capacity code Type U : Outdoor Units Model Type U : Universal Model - 9 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Part 2 Functions & Controls

    Installer Setting-Zone state setting................44 Installer Setting-Option Function Setting..............45 7.2 Zone Controller ......................46 7.3 Auto Elevation Grille....................47 8. Synchro operation......................48 - 10 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: List Of Functions & Controls

    Wireless LCD remote control General central controller General central controller CAC network Optional (Non LGAP) function Dry contact Optional Dry contact - 11 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 Soft start for compressor Optional Test function Test operation Notes: The Exploded View part has the particular Function table for each model. - 12 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 13 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Air Flow Step

    After one minute, it is opposite. Vane 1 Vane 3 Vane 4 • Comparison of Air Flow Types 4-Open (conventional) Swirl Swing (New) - 14 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Air Purifying

    Dust electrode discharge Dust particles Photo-Catalyst Coated Mesh Ionizer +4.8KV discharge Polluted Air Purified fresh Air Generating plasma Odour Odour molecule - 15 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Installation Functions

    R03S R01S HIGH Slide switch for ceiling height 4.1.4 Close the rear cover and check if it works normally. - 16 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 AUTO Heater Preheat Defrost Humidify Timer Filter Out door Time ZONE Operation unit Program set Set no. Time 01 - 17 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: High Ceiling Operation

    - When the elevation is high: higher than 3.0m in height. - Operate the device at one level higher than the standard level. - 18 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Reliability

    • The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by Micom Control. - 19 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Convenience Functions & Controls

    Heating thermo off +0.5°C SET Temp. -0.5°C Cooling thermo off Switching point -2°C Cooling Heating operation Cooling operation operation - 20 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 - After compressor off, the compressor can restart minimum 3 minutes later. - Compressor operating range is form 40% to 110% of rated condition. - 21 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 - After compressor off, the compressor can restart minimum 3 minutes later. NOTE: Some Models are different by temperature of thermo ON/OFF. - 22 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 (Option) 27°C (Option) 20°C 1min 1min Compressor Outdoor fan Setting fan Setting fan Indoor fan speed spped 4way Valve - 23 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Child Lock Function

    - The operation will be started if the ON/OFF button is pressed. - If you want to stop operation, re-press the button. - 24 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Group Control

    • While executing group control command, use the random data(0-3minutes) in the main body of indoor equipment for limiting starting current. • Control device can control up to 16 indoor equipments. - 25 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 • The maximum length of connecting wire should be below 200m(25Ω) on connect- ing each units. • Use a wire more than 0.5mm2 - 26 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Sleep Timer Operation

    Operation Time Table (Example) Setting Temp. 25°C 25°C 25°C 25°C 25°C 09:00 08:00 09:00 08:00 09:00 12:00 17:00 12:00 12:00 12:00 - 27 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Two Thermistor Control

    • To control the room temperature by a wired remote controller, install controller(room temp. sensor) to sense the temperature more accurately. • Maunfactured in the position 3. - 28 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Filter Sign Clear

    When the flashing, press the button to clear this display. CANCEL CANCEL Press button. CANCEL Repeat pressing button 3 times. CANCEL AUTO CLEAN - 29 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 When the filter is covered by dust, it will reduce cooling / heating efficiency and accumulate more electric power. Therefore, do clean the filter whenever cleaning time is expired. - 30 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Special Function & Kit

    <<You cannot use this function when using Synchro operation>> ❊ Some products do not use 'Group control'. It depends on the product type. - 31 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Installer Setting-How To Enter Installer Setting Mode

    ¡ Humidifier ¡ Elevation Grill ¡ Ventilation Kit j Some contents may not be displayed depending on the product function. - 32 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 00: Not Installed Elevation Grill 01: Installed Ventilation Kit j Some contents may not be displayed depending on the product function - 33 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Installer Setting-Test Run Mode

    ❈ During test run mode, receiving signal from wireless remote controller will release this operation. If you press any kind of button, Test Run mode will be released. - 34 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Installer Setting-Setting Address Of Central Control

    Press button to exit or system will automatically exit after 25 seconds without any input. - 35 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Installer Setting-E.s.p

    (01: very low, 02: low, 03: medium, 04: high. 05: power) Move to ESP setting by pressing button. Press button to select ESP value(0~255). - 36 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 ❈ Because the ESP value is already appropriately set when manufactured from the factory, it is recommended that you do not change the ESP value. - 37 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Installer Setting-Thermistor

    Operation in indoor unit temperature sensor Operation in lower temperature after comparing the temperature between the indoor unit 2-Thermistor(2TH) And remote controller - 38 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Installer Setting-Ceiling Height Selection

    ❈ Ceiling height of ‘Super high’ function may not exist depending on the indoor unit. ❈ Refer to the product manual for more details. - 39 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Installer Setting-Static Pressure Setting

    <Static Pressure Setting Table> Function Pressure selection Zone state ESP standard value Fixed Fixed High Variable Variable High - 40 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Installer Setting-Group Setting

    Press button to exit or system will automatically exit after 25 seconds without any input. - 41 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Installer Setting-Mode Override Setting

    Press button to exit or system will automatically exit after 25 seconds without any input. - 42 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Installer Setting-Dry Contact Mode Setting

    25 seconds without any input. * Please refer to dry contact manual for more details. - 43 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Installer Setting-Zone State Setting

    Press button to exit or system will automatically exit after 25 seconds without any input. - 44 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Installer Setting-Option Function Setting

    Press button to exit or system will automatically exit after 25 seconds without any input. - 45 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Zone Controller

    Room2 Thermostat Damper Motor Damper Motor Damper Motor Damper Motor Zone control Room3 Thermostat Room4 Thermostat sub PCB ABZCA - 46 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Auto Elevation Grille

    • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 47 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Synchro Operation

    When using synchro operation, Use only one wired remote controller in the indoor units. POWER INPUT POWER INPUT Fig.2 electric wiring - 48 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 LED stops flickering and lights continuously. 5) If you fail to perform the Addressing work, repeat step 2),3). Long Pipe - 49 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 - Use only one wired remote controller in the indoor units. - Use central controller and function controller "PQCSB101S0 &PQCSC101S0" only. - 50 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: Part 3 Control Logic

    8. LEV Control ........................64 9. Oil restoration operation....................70 10. Compressor warm-up control logic ................70 11. Heat sink control ......................70 - 51 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Compressor

    Frequency ¡ Number of poles BLDC Motor IPM (Inverter) U V W X Y Z Position Detect (16Bits) Circuit - 52 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 • Step E = (Step D + Target STEP) / 2 Target frequency (Hz) Step E frequency Step D Step C Step B Step A Time (sec) - 53 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 55: Step(Frequency) Control

    ✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity. - 54 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 100% (Option) Temp.(˚C) ∆Step DTAI : Step Compensation of temperature difference between indoor temp. and setting temp. (40-110%) - 55 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 Over load working Temperature(˚C) ∆Step DTAI : Step Compensation of temperature difference between indoor temp. and setting temp (40-110%). - 56 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Reversing Valve Operation

    7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating position. - 57 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Discharge Pipe Control

    T1:90 (Option)˚C Hz(Option) COMP Hz (Option) Down Down 10 pulse 10 pulse Expansion valve Stop control (Option) up (Option) up - 58 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 60: Input Current Control

    And after 3 min turn on the compressor and check the current again. 2) If CT2 occurs 5 times in 1 hour,stop the operation and shows Self-Diagnosis Error Mode 22 - 59 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 5 Hz 5 Hz Frequency Setting Frequency Frequency Setting Frequency (Option) (Option) frequency fixed fixed frequency fixed [Hz] Down Down - 60 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 62: Outdoor Fan Control

    Base Step+1 9~14˚C Base Step-4 -4~0˚C Base Step+2 2~9˚C Base Step-5 -8~-4˚C Base Step+2 -3~2˚C Base Step-6 -15~-8˚C Base Step+2 - 61 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 After the system is stopped by CT cut or heat sink cut-off, cycle will return to the normal operating control. T pipe (Cond Out) T2 :10(Option)˚C T1 :4(Option)˚C Outdoor fan Setting value Setting value - 62 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 64: Defrost Control

    Indoor defrost signal OFF indoor unit on/ Starting maximum defrosting time count Reversing Valve start Indoor Fan ON/OFF Outdoor Fan - 63 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 65: Lev Control

    Comp (Reset) Open Close -200 time Starting Time constant Initializin Starting control control control Heating and cooling Heating Cooling - 64 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 2. When the temperature reaches 4˚C, system return to the starting control pulse value. Pull open Starting LEV Target Pulse opening Target step Time (Option) Comp starting Time(sec) - 65 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 Condenser outlet T pipe Condenser out Evaporator inlet T suc Compressor suction Compressor suction T disp Compressor discharge Compressor discharge - 66 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 - Dis_Superheating : T dis_superheating = T dis –((Tin+Tout )/2)> 15˚C(Option) - LEV pulse down : T dis_superheating < 15˚C T dis_superheating > 20˚C ¡ Back to main control - 67 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 69: Flow Chart

    –T ≥0˚C(Option) ≥2˚C(Option) <20˚C <2˚C Check T Check T Back to Close LEV Open LEV Close LEV Main Control - 68 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 ≥15˚C(Option) ≥1˚C(Option) <15˚C <1˚C Check T Check T Back to Close LEV Open LEV Close LEV Main Control - 69 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 71: Oil Restoration Operation

    Opening target : 0.7 300 sec. 0 sec. 0 sec. 0 sec. 180 sec. 90 sec. Time (option) Time (option) Time (option) - 70 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 72: Heat Sink Control

    Heat Sink temp Toff=85(Option)˚C T2=75 (Option)˚C T1=70 (Option)˚C 5 Hz 5 Hz COMP Hz (Option) (Option) frequency frequency frequency Down Down - 71 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 73: Part 4 Test Run

    4. Test Run 4. Test Run 1. Check before Test Run.....................73 2. Test Run Flow chart ......................74 - 72 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 74: Check Before Test Run

    2.0 MΩ as a result of refrigerant accumulation in the internal compressor. If the insulation resistance is less than 2.0 MΩ, turn on the main power supply. - 73 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 75: Test Run Flow Chart

    Guide Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 74 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 PCB Assembly to the ' CEILING' state. The initial state of the slide switch is set for the bottom installation. CN_INSTALL CEILING BOTTOM - 75 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 77: Ceiling Cassette Type

    ❏ Aren't terminal screws loosened? (refrigerant and drain piping)? ❏ Is there any leakage of refrigerant? M4..118N.cm{12kgf.cm} M5..196N.cm{20kgf.cm} M6..245N.cm{25kgf.cm} M8..588N.cm{60kgf.cm} - 76 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 78: Part 5 Trouble Shooting Guide

    1. Self-diagnosis Function....................78 2. Pump Down........................80 3. Evacuation ........................81 4. Gas Charging ........................82 5. Cycle Part ........................83 6. Electronic Parts ......................84 - 77 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 79: Self-Diagnosis Function

    5times Indoor Out-Piping sensor error 6times Differnt mode operation 7times Checksum error 9times BLDC motor fan lock (indoor) 10times - 78 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 80: Trouble Shooting

    Before conducting a checking or repairing job, pull out the plug out of the outlet and make sure that the lamp on the control board outdoor unit is off. - 79 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 81: Pump Down

    – Open the low-pressure valve on the charge set slightly to air purge from the charge hose. (5) Set the 2-way valve to the closed position. - 80 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 82: Evacuation

    (4) Disconnect the charge hose from the vacuum pump. – Vacuum pump oil. If the vacuum pump oil becomes dirty or depleted, replenish as needed. - 81 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 83: Gas Charging

    1 minute and then repeat the procedure (pumping down-pin). - 82 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 84: Cycle Part

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 83 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 85: Electronic Parts

    : Check the rated voltage 2) The output voltage of power mod- 2) 12V ± 3V 2) Replace ule. P.C.B Ass'y - 84 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 85 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 86 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 88: When Indoor Fan Does Not Operate

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 87 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 89: When The Louver Does Not Operate

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 88 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 5kΩ at 25˚C? Correct connection Ω Plug the sensor on Indoor unit PCB Check the resistance Check the voltage - 89 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 (Noise interference) Is it normal ? Adjust the state Check the Volt. Check the Volt. of installation - 90 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 (short) ? Change the float switch Is the drain pump clean ? Clean drain pump Check drain tube installation - 91 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 Is it normal ? Correct connection Or re-soldering PCB Check the DC Motor signal Is it normal ? Change Indoor Motor - 92 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 ❊ CH05 is displayed at indoor unit, Is it normal ? CH53 is displayed at outdoor unit. Correct connection Is connector for communication correctly connected? - 93 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW488D DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW608D DC540V ¡¾ 10% DC680V ¡¾ 10% - 94 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW488D DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW608D DC540V ¡¾ 10% DC680V ¡¾ 10% - 95 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW488D DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW608D DC540V ¡¾ 10% DC680V ¡¾ 10% - 96 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 Check Pressure of suction pipe Check Pressure of discharge pipe Is it normal ? Re-vaccuming system & Re-charging Change main PCB - 97 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW488D DC540V ¡¾ 10% DC680V ¡¾ 10% AUUW608D DC540V ¡¾ 10% DC680V ¡¾ 10% - 98 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 99 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 101 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 100 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 102 Is it normal (4.0Vdc )? Change Main PCB Check Check TRANS Is it normal? Change TRANS Change main PCB - 101 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 103 Correct connection 4.5Vdc at 25˚C Change the sensor Repair or Change the PCB. Estimate the resistance of each sensor. - 102 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 104 /5kΩ at 25˚C? Change the sensor Ω Plug the sensor on Indoor unit PCB Check the resistance Check the voltage - 103 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 105 Check PCB Check Flow Chart (CH60) Check the the connection port. Is it normal ? Correct connection Change EEPROM - 104 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 106 Replace inverter compressor PCB Check Point - Check the Transmission connector and LED (Main & Inverter) 42/48/60k <Inverter PCB> <MAIN PCB> - 105 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 107 Correct connection 2.5Vdc at 25˚C Change the sensor Repair or Change the PCB. Estimate the resistance of each sensor. - 106 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 108 Correct connection Or re-soldering PCB Check the DC Motor signal Is it normal ? Change Indoor Motor Repair or Change the PCB. - 107 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 109 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 108 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 110 0.542 0.63 0.459 1.25 0.469 0.54 0.397 1.07 0.406 0.46 0.345 0.92 0.353 0.79 0.307 0.34 0.262 0.68 0.268 - 109 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 111 18.89 2.561 1.26 2.28 14.79 2.255 1.07 2.09 11.72 1.972 0.92 1.716 1.73 7.62 1.487 0.69 1.57 6.24 1.287 - 110 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
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