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LG LP090CED-Y8 Service Manual
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LG LP090CED-Y8 Service Manual

Window air conditioner
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Internal Use Only
http://biz.lgservice.com
Window Air Conditioner
SVC MANUAL
MODEL : LP090CED-Y8
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 LP090CED-Y8

  • Page 1 Internal Use Only http://biz.lgservice.com Window Air Conditioner SVC MANUAL MODEL : LP090CED-Y8 CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Specification

    ❈ Some of functions are slightly different depending upon models. ❈ The specification may be subject to change without prior notice for purpose of improvement. - 2 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Features And Benefits

    This feature extends the overall life of compressor by preventing the short-cycling of the air-conditioner. When the compressor restarts, LG PTAC is designed to give a minimum of three minutes to have a time of equalizing the refrigerant pressures for optimizing cycling.
  • Page 4 The unit will activate the reverse cycle defrost when the outdoor coil temperature has remained at a cold temperature to form the ice on the coil.This ice will reduce airflow though the coil and will also reduce the efficiency of unit. The LG PTHP will employ an active reverse cycle defrost function to melt the ice off the outdoor coil for insuring room comfort conditions and savings from extended operation.

  • Page 5: Electronic Control

    • Push Timer to cycle through the settings from 1 Hour ¡ 2 Hours ¡ ... ¡ 12 Hours maximum. - 5 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 HEAT after the cooling season is over. This odor, caused by fine dust particles on the heater, will disappear quickly. This is harmless. - 6 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Additional Controls

    54° F (12.2° C) 72° F (22.2° C) Unit Type Cooling+Electric Heater+Heat Pump Cooling+Electric Heater Heat Pump Only Cooling Only - 7 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Energy Saver

    24 Volt-N 24 Volt-L Compressor Heater Reversing Valve High Fan Low Fan GL GH O (Molex Housing Spec 396-07V) - 8 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Mechanical Parts

    Flip the discharge grille 180°, then reattach the discharge grille to the front grille with 4 screws. - 9 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Control Box

    6. Pull the control box assembly out from the unit. (See Figure 4) 7. Re-install the components by referring to the removal procedure. Figure 4 - 10 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Air Handling Parts

    8. Pull the electric heater towards left for a while and then lift up vertically to disassemble it completely from Air guide. Figure 8 - 11 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Cross Flow Fan

    Figure 12) 5. Remove the axial fan. 6. Re-install the components by referring to the removal procedure. Figure 12 - 12 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Electrical Parts

    4. Disconnect all the leads of capacitor terminals. 5. Re-install the components by referring to the removal procedure, above. Figure 16 - 13 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Power Cord

    The wires should also be pressed a little downwards to prevent touching it to the display PWB. Figure 19 - 14 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Refrigeration Cycle

    2. Remove the capillary tube. 3. Re-install the components by referring to notes. - 15 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Open valve C. Discharge the line at the manifold connection. 5) The system is now ready for final charging. - 16 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Figure 22A-Pulling Vacuum Figure 22B-Charging - 17 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Installation

    4) Insulation strip prevents the exhaust air from re-entering from either side of condenser space which may decrease Rear the cooling efficiency of condenser. - 18 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Wall Sleeve Installation

    Internal Condensate Removal (ICR) system optional on heat pump units. - 19 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Preparation Of The Front Grille

    A Construction level unit will also insure proper performance of As shipped, the LG wall sleeve is ready for installation. the Internal Condensate Removal (ICR) system Do not remove the stiffener from inside the wall case or the optional on heat pump units.
  • Page 21 - 21 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 - 22 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Unit Installation

    4. Reinstall the front grille by hooking the top over the unit top, then pushing it in at the bottom. (See Figure 27) Figure 27 - 23 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Electrical Requirements

    National Electrical Code and local codes and ordinances. NOTE: DO NOT USE AN EXTENSION CORD on 208, 230, and 208/230 Volt units. - 24 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Field-Installed Accessories

    Figure 30 - New Door Installation Figure 28 - Remove Front Door Hinge Pins (Each Side) Brackets (Each Side) Front - 25 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Important Note: The unit OFF switch does not disconnect all electrical power to this unit. - 26 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 10. Place the top cover assembly back into the unit. coming out of the inlet of the spraying tube. Figure 37 - 27 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 40 Figure 39 - 28 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 The unit OFF switch does not disconnect all electrical power corresonding holes in the architectural grille. to this unit. - 29 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Condensate Drain Kit

    See Figure 42 for components of the drain kit. - 30 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 Slide the chassis into the wall sleeve until the chassis flanges - 31 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Leveling Legs

    Checklist The following is an abbreviated guide to leveling leg installation. Refer to appropriate areas for more detailed information. - 32 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 1. Two leveling legs are supplied in each kit. 2. One kit is required per unit. 3. Four mounting screws are provided in each kit. - 33 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Hard Wire Kit

    12. Insert the wire tie into the 1/4-inch diameter hole located just above the incoming power opening. Tie all wires together securely with the wire tie. See Figure 51. - 34 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Figure 52 - Electrical Wiring Routing Right Side of Chassis Wire Tie 3/16 Inch Diamenter Hole Electrical Supply Wires Back of Control Panel - 35 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Fuse Holder Kit

    Control Panel The unit OFF switch does not disconnect all electrical power to this unit. Fuse Holder Knockouts under panel - 36 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 Wire nut the other end to black subbase wire leading to Fuseholder RD-9 receptacle. (Figure 51) Green Field Connection Black Wiring - 37 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors may result in equipment damage. - 38 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 Figure 57 - NEMA Plug Configurations Voltage Unit Plug Subbase Receptacle 2-13/16" Cover (71 mm) Wiring Access Subbase Box Assembly Low Voltage Compartment - 39 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Troubleshooting Guide

    LIQUID LIQUID OUTLET PRESSURE DROP (LIQUID REFRIGERANT) HIGH PRESSURE VAPOR LIQUID PEFRIGERANT CAPILLARY TUBE LOW PRESSURE VAPOR Figure 58 - 40 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 Satisfactory operation with temperature difference of Repair clogging in inlet & outlet air 44.6~50˚ F refrigeration circuit. (7~10˚ C) - 41 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 Regular but fails to start Irregular motor insulation ( ) Replacement of compressor (locking of rotor, metal) Replacement of compressor (Motor damaged) - 42 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 If knocking sounds continue when running or loose, replace the motor. If the motor hums or noise appears to be internal while running, replace motor. - 43 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Room Air Conditioner Voltage Limits

    ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING MINIMUM MAXIMUM 208/230V 187V 253V - 44 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 If the blower or fan is hitting air guide, rearrange the air handling parts. Copper tubing Carefully rearrange tubing not to contact, compressor, shroud, and barrier. - 45 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Piping Diagrams

    Compressor Gas side LOC. Description PCB Connector Thermistor for indoor Air temperature CN-IDAT Thermistor for Evaporator Pipe temperature CN-IDPT - 46 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Schematic Diagram

    A C I T OR GN/YL M O TO GN/YL P/NO:3850A20594H CN-DISP1 CN-DISP2 CN-ODT CN-IDAT CN-IDPT CN-AUX_S CN-THERMO_S CN-LINK CN-IDF CN-4WAY CN-ODF CN-ICR - 47 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Exploded View

    Note) * Please ensure GCSC since the replacement parts may be changed depending upon the buyer's request. Please check the correct parts in View RPL(Replacement Part List) on GCSC. (GCSC Website http://biz.lgservice.com) - 48 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 P/NO : MFL42137105 February, 2008...

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