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LG FM15AH UL3 Svc Manual
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LG FM15AH UL3 Svc Manual

Multi air conditioner, multi-inverter type
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Internal Use Only
http://biz.lgservice.com
Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-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 FM15AH UL3

  • Page 1 Internal Use Only http://biz.lgservice.com Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-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 ..................59 2. Pump Down ......................63 3. Evacuation......................64 4. Gas Charging .......................65 5. Cycle Part ......................66 6. Electronic Parts....................67 - 1 - Copyright ©2007 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........................11 - 2 - Copyright ©2007 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 ©2007 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 ©2007 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 ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    [MT24AH NH0] * indicates color of panel(B:Blue, C:Cherry, D:Wood, M:Metal, R:Mirror, V:Silver, W:White wood, E:Red, G:Gold, H:White Silver, 1:KISS) - 6 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 [MB09AHB NP0] [MB12AHB NP0] AMNH096VEA0 AMNH126VEA0 [MV09AH NE0] [MV12AH NE0] Ceiling & floor AMNH186VBA0 AMNH246VBA0 [MV18AH NB0] [MV24AH NB0] - 7 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Outdoor Units

    No. of connectable indoor units Max.5 Total capacity index of connectable 14.1 15.2 indoor units kBtu/h Power supply 1ø, 220-240V, 50Hz Chassis - 8 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 Number of BD units to be connected Max.3 Total capacity index of connectable 21.4 indoor units kBtu/h Power supply 3ø, 380-415V, 50Hz Chassis - 9 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 PMBD7230 PMBD3640 Connectable indoor unit capacity 2.05~7.03 5.28~10.6 2.05~7.03 5.28~10.6 2.05~7.03 kBtu/h 7~24 18~36 7~24 18~36 7~24 BD unit - 10 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Nomenclature

    Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units A6U : Connectable max. 6 indoor units - 11 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 Ex) 36,000 Btu/h ¡ '36', 72,000 Btu/h ¡ '72' BD : Branch distributor M : Multi system outdoor unit P : Parts - 12 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Part 2 Functions & Controls

    7.1 Zone Controller ......................36 7.2 Low Ambient control....................36 7.3 Space Control ......................37 7.4 Auto Elevation Grille....................37 7.5 Defrost Control(Heating) .....................38 - 13 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: List Of Functions & Controls

    Wireless LCD remote control General central controller General central controller Optional CAC network (Non LGAP) function Dry contact Optional Dry contact - 14 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Soft start for compressor Optional Test function Test operation Notes: The Exploded View part has the particular Function table for each model. - 15 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 16 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: 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) - 17 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: 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 - 18 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Installation Functions

    R03S R01S HIGH Slide switch for ceiling height 4.1.4 Close the rear cover and check if it works normally. - 19 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 AUTO Heater Preheat Defrost Humidify Timer Filter Out door Time ZONE Operation unit Program set Set no. Time 01 - 20 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 & E.S.P. which are mentioned in the table. 2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies. - 21 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: 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. - 22 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Reliability

    Compressor OFF Temp. ➔ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 23 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: 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 - 24 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 - intake air temperature reaches below 1.0°C of the temperature of setting temp.. • Compressors two minutes time delay. - After compressor off, the compressor can restart minimum 2 minutes later. - 25 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 26 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 Setting fan Indoor fan speed speed 4way Valve * Some Models are different with temperature of indoor fan ON/OFF - 27 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Auto Cleaning Operation

    Setting step 13~14 minutes 1 minute 2~3 minutes (Cooling Only) Unit Operation Indoor Setting step L Low Comp. Setting step - 28 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Auto Operation (Fuzzy Operation)

    • While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidifica- tion operation. - 29 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Auto Restart Operation

    Memorized condition are on / off condition, operating mode (cooling/ heating), set temperature and fan speed. The unit will memorize the above conditions and start with same memorized condition. - 30 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: 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. - 31 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: 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. - 32 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 • The maximum length of connecting wire should be below 200m(25Ω) on connect- ing each units. • Use a wire more than 0.5mm2 - 33 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: 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 - 34 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: 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 1. - 35 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Special Function & Kit

    • It can prevent frosting of evaporator and keep cooling operation Outdoor pipe T2°C T1°C Outdoor Setting Setting Setting Speed Fan Speed Speed Speed - 36 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Space Control

    • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 37 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Defrost Control(Heating)

    • The second defrost starts only when the outdoor pipe temperature falls below – 6°C after from ending of the first defrost and more than 4 minutes operation of compressor. - 38 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Part 3 Control Logic

    8. LEV Control ........................48 9. Oil restoration operation....................50 10. Compressor warm-up control logic ................50 11. Heat sink control ......................51 - 39 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Compressor

    Frequency ¡ Number of poles BLDC Motor IPM (Inverter) U V W X Y Z Position Detect (16Bits) Circuit - 40 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 • Step E = (Step D + Target STEP) / 2 Target frequency (Hz) Step E frequency Step D Step C Step B Step A Time (sec) - 41 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Step(Frequency) Control

    ✽ The compressor get the minimum step in case Step base value is lower than the minimum step of operating capacity. - 42 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Reversing Valve Operation

    7. If the compressor is stopped during heating mode by Thermistor signal, reversing valve will remain in heating position. - 43 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: 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 - 44 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Input Current Control

    5 Hz 5 Hz Frequency Setting Frequency Frequency Setting Frequency (Option) (Option) frequency fixed fixed frequency fixed [Hz] Down Down - 45 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Outdoor Fan Control

    26°C 45°C 41°C 22°C 18°C 38°C 14°C 28°C 10°C 24°C 18°C 4°C 14°C 0°C 9°C -4°C 2°C -8°C -3°C - 46 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Defrost Control

    Indoor defrost signal OFF indoor unit on/ Starting maximum defrosting time count Reversing Valve start Indoor Fan ON/OFF Outdoor Fan - 47 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Lev Control

    Comp (Reset) Open Close -200 time Starting Time constant Initializin Starting control control control Heating and cooling Heating Cooling - 48 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 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) - 49 - Copyright ©2008 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 ©2008 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 ©2008 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 3. Test Running........................55 - 52 - Copyright ©2007 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 ©2007 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 ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: Test Runing

    I In the case when the vibration of the unit is conveyed to the hose, secure the unit with an anti-vibration rubber. Discharge temperature - 55 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 PCB Assembly to the ' CEILING' state. The initial state of the slide switch is set for the bottom installation. CN_INSTALL CEILING BOTTOM - 56 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: 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} - 57 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Part 5 Trouble Shooting Guide

    1. Self-diagnosis Function....................59 2. Pump Down........................63 3. Evacuation ........................64 4. Gas Charging ........................65 5. Cycle Part ........................66 6. Electronic Parts ......................67 - 58 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 60: Self-Diagnosis Function

    Float switch Open Communication(Indoor ↔ Outdoor) Communication Poorly Outlet pipe sensor Open / Short Different operation mode Different operation mode - 59 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Outdoor BLDC Fan Lock 6times 7times Outdoor Fan is not operating PFC Fault Error(S/W) 7times 3times Over Current of Outdoor Unit PFC - 60 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Capacity Over 5times 1time Signal Error(DSP Board <-> Main Board) 5times 2times Signal Error (Indoor <-> Outdoor) 5times 3times - 61 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 6times 3times Heatsink Th Error (Open/Short) 6times 5times Outdoor BLDC Fan Lock 6times 7times PFC Fault Error(S/W) 7times 3times - 62 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 64: 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. - 63 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 65: 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. - 64 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 66: Gas Charging

    1 minute and then repeat the procedure (pumping down-pin). - 65 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 67: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 66 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 68: Electronic Parts

    4) Replace P.C.B Ass'y 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace P.C.B Ass'y : DC4.5V↑ - 67 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 * Check display P.C.B Assembly - Voltage between CN-DISP1 should be DC +5V, - If problem still persists, Replace display PCB - 68 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 69 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 71: When Indoor Fan Does Not Operate

    The voltage of Pin No 1(orange) and 3(black) of CN-FAN. About AC 160V over About AC 50V over SSR is not damaged Check SSR - 70 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 72: When The Louver Does Not Operate

    If there are no problems after above checks. • Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver - 71 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 73: Troubleshooting Indoor Error

    8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ¡ Repair or Change the PCB. - 72 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) ¡ Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) ¡ Adjust the state of installation - 73 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) ¡ Repair or Change the main PCB. - 74 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 76: Troubleshooting Outdoor Error

    ¡ Check the another indoor unit. * CH05 is displayed at indoor unit, CH53 is displayed at out- door unit. - 75 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 5. Check the insulation from water at IPM part. ¡ Check the trace of water. 6. Check the IPM circuit. - 76 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the internal circuit. (C/T, Diode, Resistor) - 77 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 • Check the components. Check Point 1. Check the power source. 2. Check the components (B/Diode, Reactor, PSC Parts ) - 78 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 2. Check the install condition for over load. (Trans1, B/Diode, Diode, Resistance) 3. Check the SVC V/V open. 4. Check the leakage of refrigerant. - 79 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 2. Check the components 2. Check the insulation of IPM part. (IGBT, R04S, NF1, BD02S) 3. Check the compressor. (same with CH21) - 80 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 3. Check the leakage of refrigerant. 3. Check the leakage of refrigerant. 4. Check the constant compressor. (same with CH21) - 81 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. - 82 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 • CH 51 1. Check the insertion condition of EEPROM. 1. Check the indoor unit capacity. 2. Check the poor soldering - 83 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) 2. Check the Outdoor temp. is very high. - 84 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 2. In Case of CH53, Check the Connection ¡ CN-COMM at the Main PCB ¡ L , N at the terminal block CN-COMM CN-Power < MAIN PCB > - 85 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 Resistance(Ω) at 20°C Constant Inverter Terminal comp. comp. Ω U-GND 2MΩ 2MΩ V-GND 2MΩ 2MΩ W-GND 2MΩ 2MΩ - 86 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 87 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 88 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 89 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 < Input Power Source Check Point > < Main PCB> <CT Sensing Check Point> < Inverter PCB> <CT Sensing Check Point> - 90 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 Power connection normal? Inverter PCB assembly CN(L), CN(N) Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 91 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 < Input Power Source Check Point > 27/30/40k < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 92 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 48/56k < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 93 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 LGMV similar as Replace high pressure sensor at manifold gauge? Check pipe is blocked or not and take measure - 94 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 < Checking the Press switch > 48/56k < Main PCB : Connection Check Point > < Checking the H/press switch > - 95 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 96 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 < Input Voltage Sensing Check Point > < Inverter PCB> 48/56k INPUT(V) INPUT(V) INPUT(V) < Input Voltage Sensing Check Point > < Inverter PCB> - 97 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 98 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 Replace PCB assembly if it is short between pins Signal pin Signal pin Signal pin except No.4,5 pins. CAUTION PFCM module No.4,5 pins are internal short state. - 99 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 101 Power connection normal? Inverter PCB assembly CN(L), CN(N) Is Inverter PCB Normal? Replace inverter PCB assembly Recheck power and installation condition - 100 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 102 < Input Power Source Check Point > 27/30/40k < Main PCB> <DC_LINK Sensing Check Point> <DC Link Voltage Check Point> - 101 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 103 48/56k < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 102 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 104 Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 103 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 105 1. Check the Input Voltage (L–N ➔ 220V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 104 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 106 < CT Sensing Check Point > < Inverter PCB> 48/56k INPUT(CT) INPUT(CT) INPUT(CT) < CT Sensing Check Point > < Inverter PCB> - 105 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 107 Replace inverter compressor PCB Check Point - Check the Transmission connector and LED (Main & Inverter) 48/56k <Inverter PCB> <MAIN PCB> - 106 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 108 Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction 27/30/40k <MAIN PCB> <EEPROM Direction Check Point> - 107 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 109 5. Trouble Shooting 48/56k <MAIN PCB> <Inverter PCB> <EEPROM Direction Check Point> - 108 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 110 2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k 3. Resistance value should be in 7kΩ ±10%.(at 25°C). - 109 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 111 Measuring resistance between No.19,20 pin 48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 110 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 112 3. Resistance value should be in 7kΩ ±10%.(at 25°C). 4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition. - 111 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 113 Measuring resistance between No.19,20 pin 48/56k PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 112 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 114 1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode) 2. Voltage vaule should be in 1V ±0.2V. - 113 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 115 27/30/40k Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> 48/56k <Inverter PCB> - 114 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 116 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? ¡ Replace inverter PCB assembly Recheck power and installation condition - 115 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 117 < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 116 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 118 < Noise Filter wiring Check Point > < Input Power Source Check Point > < Inverter PCB wiring Check Point > - 117 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 119 ¡ CN- INVERTER at the Noise Filter < Noise Filter > AC-220V AC-220V AC-220V MAIN-COMM MAIN-COMM MAIN-COMM < INVERTER PCB > - 118 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 120 1.083 1.123 1.096 Copper Comp pipe Resistance(Ω) at 20°C Inverter Terminal comp. Ω U-GND 50MΩ V-GND 50MΩ 50MΩ W-GND - 119 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 121 In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. - 120 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 122 Check inverter PCB assembly IPM normality Is inverter PCB assembly ¡ Replace inverter PCB assembly normal? Recheck power and installation condition - 121 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 123 5. Check the CT Sensor Output signal (Check output pin 1.2 of the CT Sensor : 5V ) Tester CT Sensor Output (at the INVERTER PCB) - 122 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 124 Inverter PCB assembly CN_L1(R), CN_L2(S), CN_L3(T) Power connection normal? Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 123 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 125 <DC Link Voltage Check Point> Tester DC Link DC Link Voltage INV DC Link Voltage INV oltage INV <INPUT VOLTAGE Check Point> - 124 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 126 < CH25 Check Point > INPUT VOL INPUT VOLTAGE INV INPUT VOLTAGE INV AGE INV <INPUT VOLTAGE Check Point> - 125 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 127 W V U 4. Check the IPM.(Refer 106 page) 5. Check the pressure of refrigerant. 6. Check the Service Valve Open. - 126 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 128 2. Check the Service Valve open. 3. Check the outdoor fan operating condition 4. Check the leakage of refrigerant. - 127 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 129 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 128 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 130 COMP CURRENT CURRENT U,V,W U,V,W <INVERTER PCB> INPUT INPUT INPUT VOLTAGE INV VOLTAGE INV AGE INV <INPUT VOLTAGE Check Point> - 129 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 131 3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal. Ω If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. - 130 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 132 • CH 51 1. Check the insertion condition of EEPROM. 1. Check the indoor unit capacity. 2. Check the poor soldering - 131 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 133 <Noise Filter Connection Check> CN-L3(T) CN-L3(T) CN-L3(T) CN-L1(R) CN-L1(R) CN-L1(R) CN-AC-220V CN-AC-220V CN-AC-220V CN-L2(S) CN-L2(S) CN-L2(S) <INVERTER PCB Connection Check> - 132 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 134 Replace the heatsink sensor (10kΩ ±10% at 25°C) Replace the heatsink sensor Is normal Inverter PCB ? Recheck power and installation condition - 133 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 135 Is Fan motor nomal? Replace inverter PCB assembly <INVERTER PCB connection> <fan motor middle connection> <FAN Motor Connection check> - 134 - Copyright ©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 136 JUNE, 2008 P/NO : MFL36552501...

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