LG Electronics AS-W096URH1/UBH1/UWH1/UMH1, AS-W126URH1/UBH1/UWH1/UMH1 Table of Contents

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Air Conditioner Service Manual
TABLE OF CONTENTS
LG Model Name	3
Safety Precautions	5
Dimensions	10
Symbols Used in this Manual	10
Indoor Unit	10
Outdoor Unit	11
Product Specifications	12
Installation	13
Select the Best Location	13
Piping Length and Elevation	14
Fixing Installation Plate	14
Drill a Hole in the Wall	15
Flaring Work	15
Connection of Piping	16
Connecting the Cables	22
Checking the Drainage	24
Forming the Piping	25
Air Purging	26
Test Running	28
Functions	30
Operation	33
Disassembly	47
Indoor Unit	47
Schematic Diagram	50
Electric Control device	50
Wiring Diagram	52
Components Location	54
Troubleshooting Guide	57
Refrigeration Cycle Diagram	57
Pipe Length and the Elevation	58
2-way, 3-way Valve	59
Cycle Parts	66
Self-diagnosis Function	67
Electronic Parts	69
Exploded View	80
Indoor Unit	80
Outdoor Unit	81
Replacement Parts List	82
Indoor	82
Outdoor	84

2Room Air Conditioner

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Contents LG Room Air Conditioner Table of Contents Code Type Code of Model Meaning LG Model Name2002 2003~2005 MeaningSafety Precautions InstallationThere is risk of fire, electric shock, explosion, or injury Operation ThinnerKeep level even when installing the product Be cautious that water could not enter the productOperation Indoor Unit DimensionsSymbols Used in this Manual 9k, 12k Btu SeriesOutdoor Unit Product Specifications AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1Indoor unit InstallationSelect the best Location Outdoor unitPiping Length and Elevation Fixing Installation PlateOil trap should be installed every 5~7 meters Drill a Hole in the Wall Flaring WorkIndoor Connecting the PipingCheck Foamed polyethylene or equivalent is recom- mendedWrap the insulation material around the connecting portion For left rear piping Indoor unit installation For left piping. Follow the instruction below Good case Bad caseOutdoor Outdoor unitConnecting the Cables Circuit Grade Breaker Drain piping Checking the DrainageTo check the drainage Forming the Piping Air purging with vacuum pump Air PurgingAir purging Finishing the job Soap water methodEvacuation Settlement of outdoor unit Prepare remote controllerTest Running Evaluation of the performancePump Down Procedure Pump DownFunctions Overheatng. ProtectionPower module Power relay controlActive power filter controlPSC Stand by control at low tempHigh39C Low11C Cancel Sleep Mode, Timer on or Timer OFF3, 4, 5, 6 Off Timer Cooling Down to 18C Heating Down to 16C Up to 30CLG Brand/OEM Brand OperationLED display of indoor unit Protection of the evaporator pipe from frosting Control methodCooling mode operation Model Comp. Operating frequencyHealthy Dehumidification mode operation Intake air Temp Setting TempTemp. differences Comp. Operating frequency Heating mode operationOperating freq. step of comp Fuzzy operation for cooling Fuzzy mode operationOptionalsIntake air temp Setting temp Fan speed At beginningFuzzy operation for Heating Fuzzy operation for dehumidificationSwing mode Jet cool mode operationJet heat mode operation Chaos swing modeSleep timer operation for heating cycle Sleep timer operationSleep timer operation for cooling cycle Forced operation Indoor temp Operating Mode Setting tempAuto restarting operation Trial OperationProtection from total current control Protection from DC Peak CurrentPortection from overheating of power module Portection from overheating of compressorAS-W096/126U1 Series Defrosting controlAS-W096/126U0 Series Low Ambient Auto CleaningAuto ChangeoverOptional Disassembly To remove the Grille from the ChassisTo remove the Evaporator To remove the Control BoxTo remove the Discharge Grille To remove the Motor Cover To remove the Cross-Flow FanIndoorAS-W096U 0, AS-W126U 0 Series Schematic DiagramElectric Control Device OutdoorAS-W096Series, AS-W126Series Wiring Diagram Indoor Unit AS-W096/126U0,1 SeriesOutdoor Unit AS-W096U0 Series AS-W126U0 SeriesIndoor Main P.W.B Assembly DC Part Components LocationDisplay ASSEMBLYAS-W096/126U0,1 Series Outdoor Main P.W.B Assembly AS-W096/126U0 Series Model Capillary Tube Troubleshooting GuideRefrigeration Cycle Diagram Model Adopted Electrion Expansion ValveOutdoor unit Indoor unit Oil trap should be installed per 5~7 metersPipe Length and the Elevation Way, 3-way Valve Way Valve Liquid SideCheck for gas leakage ProcedureAir purging Purge the air from the systemSet the 2-way valve to the closed position Pumping DownAir purging of the charge hose Re-air Purging Re-installationMount the valve stem nuts and the service port nut Air purgingBalance Refrigerant of the 3-way Valve Gas leakageEvacuation All amount of refrigerant leakedConnect the charge hose to the charging cylinder Gas ChargingAfter Evacuation Purge the air from the charge hoseCycle Parts Trouble analysisSelf-diagnosis function Precaution in Service or Check Diagnosis ProcedureProcedure Specification Remedy Electronic PartsProduct doesnt operate with the remote controller Compressor/Outdoor Fan are unable to drive Check Point Comp. on Comp. OFFWhen indoor Fan does not operate Trouble 5 When the horizontal louver does not operate Heater does not operate at all Outdoor Unit does not operate at all Indoor OutdoorTrouble 8-1When compressor does not operate normally DC Peak ErrorError Code ➅Trouble 8-2When compressor does not oprate normally Communication error between Indoor and Outdoor Error Code ➄Trouble 8-3When compressor does not oprate normally CT Error Error Code ➆Connectors Condition Problem error mode Problem of missing the connector Indoor Main PCB AssyProblem of missing the connector Outdoor Main PCB Assy CN-T/BlockExploded View Indoor UnitOutdoor Unit Replacement Parts List DescriptionPanel ASSY, Front SUB No A20061Z October