LG Electronics AS-W126URH0/UBH0/UWH0/UMH0/UCH0 service manual Pump Down Procedure

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Installation

NOTICE If the actual pressure is higher than shown, the system is most likely over-charged, and charge should be removed. If the actual pressure are lower than shown, the system is most likely undercharged, and charge should be added.

PUMP DOWN

This is performed when the unit is relocated or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant into the outdoor unit without the loss of refrigerant.

CAUTION: Be sure to perform Pump Down procedure in the cooling mode.

Pump Down Procedure

1.Connect a low-pressure gauge manifold hose to the charge port on the gas side service valve.

2.Open the gas side service valve halfway and purge the air in the manifold hose using the refrigerant.

3.Close the liquid side service valve(all the way).

4.Turn on the unit's operating switch and start the cooling operation.

5.When the low-pressure gauge reading becomes 1 to 0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the gas side valve and then quickly turn off the unit. Now Pump Down procedure is completed, and all refrigerant is collected into the outdoor unit.

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Contents LG Room Air Conditioner Table of Contents Code Type Code of Model Meaning LG Model Name2002 Meaning 2003~2005Installation Safety PrecautionsThere is risk of fire, electric shock, explosion, or injury Thinner OperationBe cautious that water could not enter the product Keep level even when installing the productOperation Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Btu SeriesOutdoor Unit AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1 Product SpecificationsSelect the best Location InstallationIndoor unit Outdoor unitPiping Length and Elevation Fixing Installation PlateOil trap should be installed every 5~7 meters Flaring Work Drill a Hole in the WallCheck Connecting the PipingIndoor Foamed polyethylene or equivalent is recom- mendedWrap the insulation material around the connecting portion For left rear piping Indoor unit installation Bad case For left piping. Follow the instruction below Good caseOutdoor unit OutdoorConnecting 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 Test Running Prepare remote controllerSettlement of outdoor unit Evaluation of the performancePump Down Pump Down ProcedureFunctions Active power filter controlPSC Power relay controlOverheatng. ProtectionPower module Stand by control at low temp3, 4, 5, 6 Off Timer Cancel Sleep Mode, Timer on or Timer OFFHigh39C Low11C Cooling Down to 18C Heating Down to 16C Up to 30CLG Brand/OEM Brand OperationLED display of indoor unit Control method Protection of the evaporator pipe from frostingModel Comp. Operating frequency Cooling mode operationIntake air Temp Setting Temp Healthy Dehumidification mode operationTemp. differences Comp. Operating frequency Heating mode operationOperating freq. step of comp Intake air temp Setting temp Fan speed Fuzzy mode operationOptionalsFuzzy operation for cooling At beginningFuzzy operation for dehumidification Fuzzy operation for HeatingJet heat mode operation Jet cool mode operationSwing mode Chaos swing modeSleep timer operation for heating cycle Sleep timer operationSleep timer operation for cooling cycle Auto restarting operation Indoor temp Operating Mode Setting tempForced operation Trial OperationProtection from DC Peak Current Protection from total current controlPortection from overheating of compressor Portection from overheating of power moduleAS-W096/126U1 Series Defrosting controlAS-W096/126U0 Series Low Ambient Auto CleaningAuto ChangeoverOptional To remove the Grille from the Chassis DisassemblyTo remove the Evaporator To remove the Control BoxTo remove the Discharge Grille To remove the Cross-Flow Fan To remove the Motor CoverIndoorAS-W096U 0, AS-W126U 0 Series Schematic DiagramElectric Control Device OutdoorAS-W096Series, AS-W126Series Indoor Unit AS-W096/126U0,1 Series Wiring DiagramAS-W126U0 Series Outdoor Unit AS-W096U0 SeriesComponents Location Indoor Main P.W.B Assembly DC PartDisplay ASSEMBLYAS-W096/126U0,1 Series Outdoor Main P.W.B Assembly AS-W096/126U0 Series Refrigeration Cycle Diagram Troubleshooting GuideModel Capillary Tube Model Adopted Electrion Expansion ValveOutdoor unit Indoor unit Oil trap should be installed per 5~7 metersPipe Length and the Elevation Way Valve Liquid Side Way, 3-way ValveAir purging ProcedureCheck for gas leakage Purge the air from the systemSet the 2-way valve to the closed position Pumping DownAir purging of the charge hose Mount the valve stem nuts and the service port nut Re-installationRe-air Purging Air purgingGas leakage Balance Refrigerant of the 3-way ValveAll amount of refrigerant leaked EvacuationAfter Evacuation Gas ChargingConnect the charge hose to the charging cylinder Purge the air from the charge hoseTrouble analysis Cycle PartsSelf-diagnosis function Diagnosis Procedure Precaution in Service or CheckElectronic Parts Procedure Specification RemedyProduct doesnt operate with the remote controller Check Point Comp. on Comp. OFF Compressor/Outdoor Fan are unable to driveWhen indoor Fan does not operate Trouble 5 When the horizontal louver does not operate Heater does not operate at all Indoor Outdoor Outdoor Unit does not operate at allDC Peak ErrorError Code ➅ Trouble 8-1When compressor does not operate normallyCommunication error between Indoor and Outdoor Error Code ➄ Trouble 8-2When compressor does not oprate normallyCT Error Error Code ➆ Trouble 8-3When compressor does not oprate normallyProblem of missing the connector Outdoor Main PCB Assy Problem of missing the connector Indoor Main PCB AssyConnectors Condition Problem error mode CN-T/BlockIndoor Unit Exploded ViewOutdoor Unit Description Replacement Parts ListPanel ASSY, Front SUB No A20061Z October