LG Electronics AS-W126URH1/UBH1/UWH1/UMH1 Air purging, Procedure, Check for gas leakage

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Troubleshooting Guide

Air purging

Required tools : hexagonal wrench, adjustable wrench, torque wrenches, wrench to hold the joints, and gas leak detector.

The additional gas for air purging has been charged in the outdoor unit.

However, if the flare connections have not be done correctly and there gas leaks, a gas cylinder and the charge set will be needed.

The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration pipes, it will affect the compressor, reduce to cooling capacity, and could lead to a malfunction.

Indoor unit

Liquid side

 

 

 

 

Open

Outdoor unit

 

2-way

 

 

valve

 

 

Gas side

 

 

Clsed

 

 

3-way

 

 

valve

 

Service port nut:

Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the gas leakage from the refrigeration cycle.

CAUTION: Do not leak the gas in the air during Air purging.

• Procedure

(1)Recheck the piping connections.

(2)Open the valve stem of the 2-way valve coun- terclockwise approximately 90°, wait 10 sec- onds, and then set it to closed position.

Be sure to use a hexagonal wrench to operate the valve stem.

(3)Check for gas leakage.

Check the flare connections for gas leakage.

(4)Purge the air from the system.

Set the 2-way valve to the open position and remove the cap from the 3-way valve’s service port.

Using the hexagonal wrench to press the valve core pin, discharge for three seconds and then wait for one minute. Repeat this three times.

(5)Use torque wrench to tighten the service port nut to a torque of 1.8kg.cm.

(6)Set the 3-way valve to the back seat.

(7)Mount the valve stem nuts to the 2-way and 3- way valves.

(8)Check for gas leakage.

At this time, especially check for gas leakage from the 2-way and 3-way valve’s stem nuts, and from the service port nut.

CAUTION: If gas leakage are discovered in step (3) above, take the following mesures :

If the gas leaks stop when the piping connections are tightened further, continue working from step (4). If the gas leaks do not stop when the connections are retightened, repair the location of the leak, dis- charge all of the gas through the service port, and then recharge with the specified amount of gas from a gas cylinder.

60Room Air Conditioner

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Contents LG Room Air Conditioner Table of Contents LG Model Name 2002Code Type Code of Model Meaning 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 Dimensions Symbols Used in this ManualIndoor Unit 9k, 12k Btu SeriesOutdoor Unit Product Specifications AS-W096U0 AS-W126U0 AS-W096U1 AS-W126U1Installation Select the best LocationIndoor unit Outdoor unitFixing Installation Plate Oil trap should be installed every 5~7 metersPiping Length and Elevation Drill a Hole in the Wall Flaring WorkConnecting the Piping CheckIndoor 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 Checking the Drainage To check the drainageDrain piping Forming the Piping Air Purging Air purgingAir purging with vacuum pump Soap water method EvacuationFinishing the job Prepare remote controller Test RunningSettlement of outdoor unit Evaluation of the performancePump Down Procedure Pump DownFunctions Power relay control Active power filter controlPSCOverheatng. ProtectionPower module Stand by control at low tempCancel Sleep Mode, Timer on or Timer OFF 3, 4, 5, 6 Off TimerHigh39C Low11C Cooling Down to 18C Heating Down to 16C Up to 30COperation LED display of indoor unitLG Brand/OEM Brand Protection of the evaporator pipe from frosting Control methodCooling mode operation Model Comp. Operating frequencyHealthy Dehumidification mode operation Intake air Temp Setting TempHeating mode operation Operating freq. step of compTemp. differences Comp. Operating frequency Fuzzy mode operationOptionals Intake air temp Setting temp Fan speedFuzzy operation for cooling At beginningFuzzy operation for Heating Fuzzy operation for dehumidificationJet cool mode operation Jet heat mode operationSwing mode Chaos swing modeSleep timer operation Sleep timer operation for cooling cycleSleep timer operation for heating cycle Indoor temp Operating Mode Setting temp Auto restarting operationForced operation Trial OperationProtection from total current control Protection from DC Peak CurrentPortection from overheating of power module Portection from overheating of compressorDefrosting control AS-W096/126U0 SeriesAS-W096/126U1 Series Auto Cleaning Auto ChangeoverOptionalLow Ambient Disassembly To remove the Grille from the ChassisTo remove the Control Box To remove the Discharge GrilleTo remove the Evaporator To remove the Motor Cover To remove the Cross-Flow FanSchematic Diagram Electric Control DeviceIndoorAS-W096U 0, AS-W126U 0 Series 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 Troubleshooting Guide Refrigeration Cycle DiagramModel Capillary Tube Model Adopted Electrion Expansion ValveOil trap should be installed per 5~7 meters Pipe Length and the ElevationOutdoor unit Indoor unit Way, 3-way Valve Way Valve Liquid SideProcedure Air purgingCheck for gas leakage Purge the air from the systemPumping Down Air purging of the charge hoseSet the 2-way valve to the closed position Re-installation Mount the valve stem nuts and the service port nutRe-air Purging Air purgingBalance Refrigerant of the 3-way Valve Gas leakageEvacuation All amount of refrigerant leakedGas Charging After EvacuationConnect the charge hose to the charging cylinder 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 ➆Problem of missing the connector Indoor Main PCB Assy Problem of missing the connector Outdoor Main PCB AssyConnectors Condition Problem error mode CN-T/BlockExploded View Indoor UnitOutdoor Unit Replacement Parts List DescriptionPanel ASSY, Front SUB No A20061Z October