LG Single A Svc Manual
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LG Single A Svc Manual

Single "a"-inverter type
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See also: Service 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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Summary of Contents for LG Single A

  • 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 .....................57 2. Pump Down .........................59 3. Evacuation ........................60 4. Gas Charging.......................61 5. Cycle Part........................62 6. Electronic Parts......................63 - 1 - Copyright ©2009 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........................7 - 2 - Copyright ©2009 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 ©2009 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 ©2009 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 ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    No. of connectable indoor units Total capacity index of Btu/h 24,000 42,000 connectable indoor units 12.5 Power supply 1Ø, 208-230V, 60Hz Chassis - 6 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Nomenclature

    Capacity code Model Type C : Cooling Only H : Heat Pump W: Inverter Heat Pump R410A Universal Outdoor Unit - 7 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Part 2 Functions & Controls

    6.2 Child Lock Function.....................24 6.3 Forced operation ......................26 6.4 Timer(On/Off) ......................26 6.5 Two Thermistor Control ....................27 6.6 Filter Sign clear ......................28 - 8 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: List Of Functions & Controls

    Wireless LCD remote control General central controller General central controller CAC network (Non LGAP) function Dry contact Dry contact - 9 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 Soft start for compressor Optional Test function Test operation Notes: The Exploded View part has the particular Function table for each model. - 10 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 11 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: 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) - 12 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: 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 - 13 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 Part 2 Functions & Controls - 14 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 - 15 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Installation Functions

    (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). - 16 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: High Ceiling Operation

    Selection of speed can be done by slide switch at the back of the LCD wired remote. installation on the higher ceiling Installation on the normal-height ceiling - 17 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Ceiling height of ‘Super high’ function may not exist depending on the indoor unit. ❊ Refer to the product manual for more details. - 18 - Copyright ©2009 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 ©2009 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 ©2009 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 ©2009 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 ©2009 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 ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Child Lock Function

    Press the fan speed and high temperature setting keys simultaneously for 3 seconds again. The unit will respond with beep, Child Lock Operation will removed. ROOM ROOM SPEED MODE - 24 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Auto Restart

    In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate proce- dures automatically to the previous operating conditions. - 25 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Forced Operation

    • The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached. • If the appliance is on pause at the time set by the timer, the pause continues. - 26 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Two Thermistor Control

    Operation in indoor unit temperature sensor Operation in lower temperature after comparing the temperature between the indoor 2-Thermistor(2TH) unit and remote controller - 27 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Filter Sign Clear

    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. - 28 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 ❈ 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. - 29 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Press button to exit or system will automatically exit after 25 seconds without any input. - 30 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Part 3 Control Logic

    8. LEV Control ........................44 9. Oil restoration operation....................50 10. Compressor warm-up control logic ................50 11. Heat sink control ......................51 - 31 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Compressor

    Frequency ¡ Number of poles BLDC Motor IPM (Inverter) U V W X Y Z Position Detect (16Bits) Circuit - 32 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 • Step E = (Step D + Target STEP) / 2 Target frequency (Hz) Step E frequency Step D Step C Step B Step A Time (sec) - 33 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Step(Frequency) Control

    ✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity. - 34 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 100% (Option) Temp.(˚C) ∆Step DTAI : Step Compensation of temperature difference between indoor temp. and setting temp. (40-110%) - 35 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 Over load working Temperature(˚C) ∆Step DTAI : Step Compensation of temperature difference between indoor temp. and setting temp (40-110%). - 36 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Reversing Valve Operation

    7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating position. - 37 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: 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 - 38 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: 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 - 39 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 5 Hz 5 Hz Frequency Setting Frequency Frequency Setting Frequency (Option) (Option) frequency fixed fixed frequency fixed [Hz] Down Down - 40 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: 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 - 41 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 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 - 42 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Defrost Control

    Indoor defrost signal OFF indoor unit on/ Starting maximum defrosting time count Reversing Valve start Indoor Fan ON/OFF Outdoor Fan - 43 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Lev Control

    Comp (Reset) Open Close -200 time Starting Time constant Initializin Starting control control control Heating and cooling Heating Cooling - 44 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 46 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) - 45 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 Condenser outlet T pipe Condenser out Evaporator inlet T suc Compressor suction Compressor suction T disp Compressor discharge Compressor discharge - 46 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 - 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 - 47 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: 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 - 48 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 ≥15˚C(Option) ≥1˚C(Option) <15˚C <1˚C Check T Check T Back to Close LEV Open LEV Close LEV Main Control - 49 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: 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) - 50 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: 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 - 51 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Part 4 Test Run

    4. Test Run 4. Test Run 1. Check before Test Run.....................53 2. Test Run Flow chart ......................54 - 52 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 54: 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. - 53 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 55: Test Run Flow Chart

    Guide Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 54 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 2. Ensure the difference between the intake temperature and the discharge one is more than 8°C (Cooling) or reversely (Heating). - 55 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 57: Part 5 Trouble Shooting Guide

    1. Self-diagnosis Function....................57 2. Pump Down........................59 3. Evacuation ........................60 4. Gas Charging ........................61 5. Cycle Part ........................62 6. Electronic Parts ......................63 - 56 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Self-Diagnosis Function

    5times Indoor Out-Piping sensor error 6times Differnt mode operation 7times Checksum error 9times BLDC motor fan lock (indoor) 10times - 57 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 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. - 58 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 60: 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. - 59 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 61: 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. - 60 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 62: Gas Charging

    1 minute and then repeat the procedure (pumping down-pin). - 61 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 63: Cycle Part

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 62 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 64: Electronic Parts

    : Check the rated voltage 2) The output voltage of power mod- 2) 12V ± 3V 2) Replace ule. P.C.B Ass'y - 63 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 64 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 65 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 67: When Indoor Fan Does Not Operate

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 66 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 68: When The Louver Does Not Operate

    Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 67 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 5kΩ at 25˚C? Correct connection Ω Plug the sensor on Indoor unit PCB Check the resistance Check the voltage - 68 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 (Noise interference) Is it normal ? Adjust the state Check the Volt. Check the Volt. of installation - 69 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 (short) ? Change the float switch Is the drain pump clean ? Clean drain pump Check drain tube installation - 70 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 Is it normal ? Correct connection Or re-soldering PCB Check the DC Motor signal Is it normal ? Change Indoor Motor - 71 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 ❊ CH05 is displayed at indoor unit, Is it normal ? CH53 is displayed at outdoor unit. Correct connection Is connector for communication correctly connected? - 72 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 DC300V ¡¾ 10% DC380V ¡¾ 10% AUUW423D[LUU425HV] DC300V ¡¾ 10% DC380V ¡¾ 10% Check the input power (Outdoor, Indoor unit) - 73 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 DC300V ¡¾ 10% DC380V ¡¾ 10% AUUW423D[LUU425HV] DC300V ¡¾ 10% DC380V ¡¾ 10% Check the input power (Outdoor, Indoor unit) - 74 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 1 Phase AUUW243D[LUU245HV] DC300V ¡¾ 10% DC380V ¡¾ 10% Compressor AUUW423D[LUU425HV] DC300V ¡¾ 10% DC380V ¡¾ 10% Check the input power - 75 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Check Pressure of suction pipe Check Pressure of discharge pipe Is it normal ? Re-vaccuming system & Re-charging Change main PCB - 76 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 DC300V ¡¾ 10% DC380V ¡¾ 10% AUUW423D[LUU425HV] DC300V ¡¾ 10% DC380V ¡¾ 10% Check the input power (Outdoor, Indoor unit) - 77 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 78 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 79 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 Is it normal (4.0Vdc )? Change Main PCB Check Check TRANS Is it normal? Change TRANS Change main PCB - 80 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 Correct connection 4.5Vdc at 25˚C Change the sensor Repair or Change the PCB. Estimate the resistance of each sensor. - 81 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 /5kΩ at 25˚C? Change the sensor Ω Plug the sensor on Indoor unit PCB Check the resistance Check the voltage - 82 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 Check PCB Check Flow Chart (CH60) Check the the connection port. Is it normal ? Correct connection Change EEPROM - 83 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 Replace inverter compressor PCB Check Point - Check the Transmission connector and LED (Main & Inverter) 42/48/60k <Inverter PCB> <MAIN PCB> - 84 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 Correct connection 2.5Vdc at 25˚C Change the sensor Repair or Change the PCB. Estimate the resistance of each sensor. - 85 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 Correct connection Or re-soldering PCB Check the DC Motor signal Is it normal ? Change Indoor Motor Repair or Change the PCB. - 86 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 87 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 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 - 88 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 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 - 89 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 0.44 3 Phase AUUW368D 1.84 1.84 1.84 AUUW428D 1.08 1.08 1.08 AUUW488D 1.08 1.08 1.08 AUUW608D 1.08 1.08 1.08 - 90 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 MARCH. 2009 P/NO : MFL47149005...

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