LG LP091CEM-Y8 Svc Manual
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LG LP091CEM-Y8 Svc Manual

LG LP091CEM-Y8 Svc Manual

Lg window air conditioner svc manual
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Download this manual See also: Owner's Manual
Internal Use Only
http://biz.lgservice.com
Window Air Conditioner
SVC MANUAL
MODEL : LP091CEM-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 LP091CEM-Y8

  • Page 1 Internal Use Only http://biz.lgservice.com Window Air Conditioner SVC MANUAL MODEL : LP091CEM-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. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 2.58 Btu/h.

  • 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. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes COOLING ONLY MODEL OPERATION MODE SELECTOR Turns air conditioner off.

  • Page 6: Additional Controls

    Temperature Temperature Limit #1 Limit #2 Limit #3 Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Cooling Operation Lowest Temp. Highest Temp. Lowest Temp. Highest Temp. 54°F (12.2°C) 86°F (30.0°C) 54°F (12.2°C) 86°F (30.0°C) 56°F (13.3°C) 86°F (30.0°C) 54°F (12.2°C) 84°F (28.9°C)

  • Page 7: Remote/Local Control

    High Fan Low Fan LO LI GL GH O (Molex Housing Spec 396-09V) Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Note:The following figures show wiring schematics for heat pump and straight cool units with electric heat, respectively.

  • Page 8: Mechanical Parts

    Remove the 4 screws that fasten the discharge grille to the front grille. Flip the discharge grille 180°, then reattach the discharge grille to the front grille with 4 screws. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 1 40˚...

  • Page 9: 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. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 2 Figure 3...

  • Page 10: 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. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 5 Figure 6...

  • Page 11: Cross Flow Fan

    4. Remove the clamp which secures the fan with pliers.(See Figure 12) 5. Remove the axial fan. 6. Re-install the components by referring to the removal procedure. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 9 Figure 10 Figure 11...

  • Page 12: Electrical Parts

    4. Disconnect all the leads of capacitor terminals. 5. Re-install the components by referring to the removal procedure, above. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 13 Figure 14 Figure 15...

  • Page 13: Power Cord

    5. Remove the two screws which fasten the P.C.B. board. 6. Re-install the components by referring to the removal procedure, above. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes for ground Figure 17 Figure 18...

  • Page 14: Refrigeration Cycle

    2. Remove the capillary tube. 3. Re-install the components by referring to notes. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 19 Figure 20 - 14 -...
  • Page 15 Open valve C. Discharge the line at the manifold connection. 5) The system is now ready for final charging. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 6. Recharge as follows : 1) Refrigeration cycle systems are charged from the high-side.
  • Page 16 Equipment needed: Vacuum pump, charging cylinder, manifold gauge, brazing equipment. pinch-off tool capable of making a vapor-proof seal, leak detector, tubing cutter, hand tools to remove components, service valve. Figure 21 A-Pulling Vacuum Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 21 B-Charging...

  • Page 17: Installation

    4) Insulation strip prevents the exhaust air from re-entering from either side of condenser space which may decrease the cooling efficiency of condenser. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Dimension of air conditioner Dimension of sleeve assembly (optional) 1-1/2"...

  • Page 18: Wall Sleeve Installation

    Internal Condensate Removal (ICR) system optional on heat pump units. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes For new construction, early planning with the architect is necessary.

  • Page 19: Preparation Of The Front Grille

    Preparation of the Wall Case for All Types of Construction As shipped, the LG wall sleeve is ready for installation. Do not remove the stiffener from inside the wall case or the weather closure panel from the outside face of the wall case until the outdoor grille and chassis are ready to be installed.
  • Page 20 - 20 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 - 21 - Copyright ©2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: Unit Installation

    (See Figure 26) 4. Reinstall the front grille by hooking the top over the unit top, then pushing it in at the bottom. (See Figure 27) Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 24...

  • Page 23: Electrical Requirements

    3.3.2 ELECTRICAL SAFETY IMPORTANT GROUNDING INSTRUCTIONS The air conditioner has a three-prong grounding plug on its power supply cord which must be plugged into properly grounded three-prong wall receptacle for your protection against possible shock hazard. FUSE – Use a time-delay fuse or circuit breaker. Refer to the nameplate for proper power supply requirements.

  • Page 24: Field-Installed Accessories

    1. Remove front from unit by pulling bottom out and then lifting upward. (Figure 28) Figure 28 - Remove Front Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 2. Remove existing door assembly by lifting door halfway and using both hands, bow door just enough for door hinge pins to slide out of mating holes.
  • Page 25 Important Note: The unit OFF switch does not disconnect all electrical power to this unit. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 1. Remove front plastic cover by rotating bottom outward and then lifting up and out from chassis.
  • Page 26 Figure 34 10. Place the top cover assembly back into the unit. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 11. Install tube #1 and tube #2 (ref. fig. 38) on the pump assembly using the rubber elbows as shown in fig.
  • Page 27 40 Make sure to fasten the pump wire through the wire clip on the back side of the control barrier as shown in fig. 39 Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 15. Assembly the unit back following the reverse order of disassembly.
  • Page 28 Important Note: The unit OFF switch does not disconnect all electrical power to this unit. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Note: A baffle kit must not be used with a stamped aluminum grille on any PTAC installation.

  • Page 29: Condensate Drain Kit

    Important Note: The unit OFF switch does not disconnect all electrical power to this unit. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Receiving Upon receipt of the product, inspect the shipping carton for signs of visible damage.
  • Page 30 Slide the chassis into the wall sleeve until the chassis flanges Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes contact the front edge of sleeve. Secure the chassis to the wall sleeve on each side with screws provided.

  • Page 31: Leveling Legs

    These components may be installed after the sleeve is secured in the wall opening just prior to the installation of the condenser grille and chassis. Figure 47 Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Leveling Legs Part No: AYLL101...
  • Page 32 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. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Installation on Wall Sleeve 1.

  • Page 33: Hard Wire Kit

    The installer must determine and supply the mounting components for attaching the junction box to the wall or door. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes WARNING...
  • Page 34 8. Install the junction box cover plate. 9. Reinstall the control panel assembly. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 50 - Mounting Hard Wire Junction Box Kit...
  • Page 35 The unit OFF switch does not disconnect all electrical power to this unit. Figure 53—Standard Escutcheon Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 54 1. Grasp the cabinet front as shown in Figure 54.
  • Page 36 The unit must be stored in its original shipping carton in a dry, secure place prior to its installation and use. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Installation...
  • Page 37 Cover Wiring Access Subbase Box Assembly Low Voltage Compartment Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Figure 59 - Dimensions Ground Screw Location 13-7/8" (352 mm) Figure 60 - Wiring Diagram NEMA 6-20R...

  • Page 38: Troubleshooting Guide

    Refer to Figure 66 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle. EVAPORATOR COILS COOLED LIQUID PRESSURE DROP Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 1,066mm (42") 505mm (20") ROOM AIR CONDITIONER CYCLE OF REFRIGERATION...
  • Page 39 Obstruction at air outlet Correct above trouble Check clogging in refrigeration circuit. Repair clogging in refrigeration circuit. Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Ineffective Cooling Check of outdoor coil (heat exchanger) & the fan operation.
  • Page 40 Replacement. Irregular motor resistance ( ) Irregular motor insulation ( ) Replacement of compressor (Motor damaged) Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Fails to Start Improper thermostat setting Loose terminal connection. Improper wiring...
  • Page 41 Fan motor noise. Grommets Turbo fan Loose set screw Worn bearings Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes CAUSE Check voltage at outlet. Correct if none. Check voltage to rotary switch. If none, check power supply cord.

  • Page 42: Room Air Conditioner Voltage Limits

    Overload ROOM AIR CONDITIONER VOLTAGE LIMITS NAME PLATE RATING 208/230V Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes CAUSE Check voltage. See the limits on the preceding. page. If not within limits, call an electrician.
  • Page 43 Unit undersized Excessive noise. Cross flow fan Copper tubing Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes CAUSE Check the voltage. See the limits on the preced- ing page. If not within limits, call an electrician.

  • Page 44: Piping Diagrams

    6. Piping Diagrams HEAT EXCHANGER (EVAPORATOR) LOC. Thermistor for indoor Air temperature Thermistor for Evaporator pipe temperature Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes CAPILLARY TUBE COMPRESSOR Description - 44 - HEAT EXCHANGER...

  • Page 45: Schematic Diagram

    7. Schematic Diagram CN-COMP CN-N(L) CN-N(N) CN-EXT(N) CN-EXT(L) CN-IDF CN-ICR Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes CN-TRANS CN-EXT CN-ODF RY-HEAT2 - 45 - In part "A", there are 3 types. Type.1 OUTDOOR...

  • Page 46: 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) Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes 352390...
  • Page 47 Brazing point in assembling or disassembling Section "B" Section "B" Section "B" Enlarged picture Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes Copper pipe Aluminum pipe Section "A" Section "A" Section "A" - 47 -...
  • Page 48 JANUARY, 2008 P/NO : MFL42137113...

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