LG Electronics AS-W096URH1/UBH1/UWH1/UMH1 Air Purging, Air purging with vacuum pump

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Installation

AirPurging

Air purging

The air and moisture remaining in the refrigerant system have undesirable effects as indicated below.

1.Pressure in the system rises.

2.Operating current rises.

3.Cooling(or heating) efficiency drops.

4.Moisture in the refrigerant circuit may freeze and block capillary tubing.

5.Water may lead to corrosion of parts in the refrigeration system.

Therefore, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor unit.

Air purging with vacuum pump

1. Preparation

•Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units have been properly connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and the liquid side on the outdoor unit. Note that both the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.

2. Leak test

• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.

CAUTION: Be sure to use a manifold valve for air purging. If it is not available, use a stop valve for this purpose. The "Hi" knob of the manifold valve must always be kept close.

•Pressurize the system to no more than 150 P.S.I.G. with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P.S.I.G. Next, test for leaks with liquid soap.

CAUTION: To avoid nitrogen entering the refrigerant system in a liquid state, the top of the cylinder must be higher than its bottom when you pressurize the system. Usually, the cylinder is used in a vertical standing position.

1.Do a leak test of all joints of the tubing(both indoor and outdoor) and both gas and liquid side service valves. Bubbles indicate a leak. Be sure to wipe off the soap with a clean cloth.

2. After the system is found to be free of leaks,

relieve the nitrogen pressure by loosening the

charge hose connector at the nitrogen cylinder.

Indoor unit

Manifold valve

When the system pressure is reduced to normal,

disconnect the hose from the cylinder.

Outdoor unit

Pressure
gauge	Hi
Lo	Hi

Charge hose

Nitrogen gas cylinder(in vertical standing position)

26Room 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