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LG LP123CD3A Manual
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LG LP123CD3A Manual

LG LP123CD3A Manual

Window air conditioner
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Internal Use Only
http://biz.lgservice.com
Window Air Conditioner
SVC MANUAL(Exploded View)
MODEL : LP123CD3A
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 LP123CD3A

  • Page 1 Internal Use Only http://biz.lgservice.com Window Air Conditioner SVC MANUAL(Exploded View) MODEL : LP123CD3A 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 ©2009 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: Control Locations

    HEAT after the cooling season is over. This odor, caused by fine dust particles on the heater, will disappear quickly. This is harmless. - 5 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 6: Fan Speed

    30 minutes. • Push Timer to cycle through the settings from 1 Hour 2 Hours 12 Hours maximum. - 6 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Self-Diagnosis

    Bad Thermistor Wiring 0.25 sec On per flash, 0.25 sec OFF between flashes, LED Flash Rate 2.00 sec OFF between codes. - 7 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: 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 - 8 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Energy Saver

    24 Volt-N 24 Volt-L Compressor Heater Reversing Valve High Fan Low Fan GL GH O (Molex Housing Spec 396-07V) - 9 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Mechanical Parts

    Flip the discharge grille 180°, then reattach the discharge grille to the front grille with 4 screws. - 10 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: 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 - 11 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 13: Cross Flow Fan

    Figure 12) 5. Remove the axial fan. 6. Re-install the components by referring to the removal procedure. Figure 12 - 13 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Electrical Parts

    4. Disconnect all the leads of capacitor terminals. 5. Re-install the components by referring to the removal procedure, above. Figure 16 - 14 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Power Cord

    The wires should also be pressed a little downwards to prevent touching it to the display pcb. Figure 18 - 15 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Refrigeration Cycle

    2. Remove the capillary tube. 3. Re-install the components by referring to notes. - 16 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 Open valve C. Discharge the line at the manifold connection. 5) The system is now ready for final charging. - 17 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Figure 16 A-Pulling Vacuum Figure 16 B-Charging - 18 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: 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. - 19 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Wall Sleeve Installation

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

  • Page 21: Preparation Of The Front Grille

    Preparation of the Wall Case for All Types of temperature control. Construction As shipped, the LG wall sleeve is ready for installation. Care should be taken in location of electrical supply entry Do not remove the stiffener from inside the wall case or the...
  • Page 22 - 22 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 - 23 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Unit Installation

    4. Reinstall the front grille by hooking the top over the unit top, then pushing it in at the bottom. (See Figure 4) Figure 4 - 24 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: 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. - 25 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Field-Installed Accessories

    Figure 23 - New Door Installation Figure 21 - Remove Front Door Hinge Pins (Each Side) Brackets (Each Side) Front - 26 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Important Note: The unit OFF switch does not disconnect all electrical power to this unit. - 27 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 10. Place the top cover assembly back into the unit. coming out of the inlet of the spraying tube. Figure 30 - 28 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 Figure 33. Figure 32 - 29 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 The unit OFF switch does not disconnect all electrical power corresonding holes in the architectural grille. to this unit. - 30 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Condensate Drain Kit

    See Figure 35 for components of the drain kit. - 31 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Slide the chassis into the wall sleeve until the chassis flanges - 32 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Leveling Legs

    Checklist The following is an abbreviated guide to leveling leg installation. Refer to appropriate areas for more detailed information. - 33 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 1. Two leveling legs are supplied in each kit. 2. One kit is required per unit. 3. Fout mounting screws are provided in each kit. - 34 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Hard Wire Kit

    12. Insert the wire tie into the 1/4" diameter hole located just above the incoming power opening. Tie all wires together securely with the wire tie. See Figure 46. - 35 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 8. Install the junction box cover plate. 9. Reinstall the control panel assembly. Back of Control Panel - 36 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Fuse Holder Kit

    Control Panel The unit OFF switch does not disconnect all electrical power to this unit. Fuse Holder Knockouts under panel - 37 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 Wire nut the other end to black subbase wire leading to Fuseholder RD-9 receptacle. (Figure 51) Green Field Connection Black Wiring - 38 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 Figure 51—Standard Escutcheon HEAT HEAT E/SAVE E/SAVE F1 LOW HIGH HIGH F2 HIGH COOL COOL TIMER TIMER TEMP/TIME MODE TIMER - 39 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 Attach skirting with four sheet metal screws provided with kit. prior to its installation and use. (Figure 57, Location E) 7. Wire subbase for appropriate voltage (Figure 59). - 40 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 41 Figure 60 - NEMA Plug Configurations Voltage Unit Plug Subbase Receptacle 2-13/16" Cover (71 mm) Wiring Access Subbase Box Assy Low Voltage Compartment - 41 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Outside Dimensions

    LIQUID LIQUID OUTLET PRESSURE DROP (LIQUID REFRIGERANT) HIGH PRESSURE VAPOR LIQUID PEFRIGERANT CAPILLARY TUBE LOW PRESSURE VAPOR Figure 60 - 42 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Troubleshooting Guide

    Satisfactory operation with temperature difference of Repair clogging in inlet & outlet air 44.6~50˚ F refrigeration circuit. (7~10˚ C) - 43 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 Regular but fails to start Irregular motor insulation ( ) Replacement of compressor (locking of rotor, metal) Replacement of compressor (Motor damaged) - 44 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 45 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. - 45 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Room Air Conditioner Voltage Limits

    ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING MINIMUM MAXIMUM 208/230V 187V 253V - 46 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 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. - 47 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Piping Diagrams

    Compressor Gas side LOC. Description PCB Connector Thermistor for indoor Air temperature CN-IDAT Thermistor for Evaporator Pipe temperature CN-IDPT - 48 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Schematic Diagram

    INDOOR Pressure MOTOR Switch GN/YL P/NO:3850A20594M CN-AUX_S CN-THERMO_S CN-IDPT CN-IDAT CN-LINK CN-ODT CN-DISP1 CN-IDF CN-DISP2 CN-4WAY CN-ICR CN-ODF CN-PRESS - 49 - Copyright ©2009 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 8. Exploded View 552114 35211A 552113 W52106 352116 352115 352390 135500B 152302A 149400 148000 342800 435300A 349600A 435300B 346810 359011 554030 337000 135515 546810 349600B 354210 559011 549990 W50400 263230B 130411 135500A 263230A 753010 W6631 249950 135312 330871 152302B 268711B 238310 135800 W0CZZB...
  • Page 51 December, 2009 P/NO : MFL63264607...

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