LG Electronics LSN090CE, LSU120CE, LSU090HE, LSU090CE, LSN180CE Cycle Parts, Trouble analysis

Page 51

Troubleshooting Guide

CycleParts

Trouble analysis

1. Check temperature difference between intake and discharge air and operating current.

Temp. Difference

Operating Current

Temp. difference : approx. °F(0°C)

Current: less than 80% of rated current

Temp. difference : approx. 14°F(8°C)

Current: less than 80% of rated current

Temp. difference

: less than 14°F(8°C)

Current

: over the reated

 

current

All amount of refrigerant leaked out. Check refrigeration cycle.

Refrigerant leakege Clog of refrigeration cycle Defective compressor

Excessive amount of refrigerant

Temp. difference : over 14°F(8°C)

• Normal

NOTICE

Temperature difference between intake and discharge air depends on room air humidity. When the room air humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower temperature difference is larger.

2. Check temperature and pressure of refrigeration cycle.

Suction pressure

Temperature

 

 

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal valve)

 

 

 

 

 

 

 

High

Defective compressor

Current is low.

 

Defective 4-way reverse valve

 

 

 

 

Higher

 

 

 

 

Excessive amount of

High pressure does not quickly

 

 

 

Normal

refrigerant

rise at the beginning of

 

 

 

operation.

 

 

 

 

 

 

Insufficient amount of

Current is low.

Lower

Higher

refrigerant (Leakage)

 

 

 

Clogging

Current is low.

 

 

 

 

NOTICE

1.The suction pressure is usually 8.5~9.5 kg/cm2G(Cooling) at normal condition.

2.The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty.

Service Manual 51

Image 51
Contents Room Air Conditioner Table of Contents Be sure not to do Be sure to follow the instruction Safety PrecautionsInstallation Do not modify or extend the power cordOperation Moisture may condense and wet or damage furnishings Low refrigerant levels may cause product failure Keep level even when installing the productOn the product. outdoor unit OccupantsSalt spray directly Solvents, etcDisuse Do not drink the water drained from the unitReplace all the batteries in the remote Dimensions Symbols Used in this ManualIndoor Unit Model Btu Series Dimension Mminch 109042.9 30011.8 1787.0 9k, 12k Outdoor UnitDIM 18k, 24kIntroduction FeaturesInstallation Installation PartsInstallation Tools Bushing-Sleeve Installation MapThis Product Contains R-410A Refrigerant Confirm The RefrigerantOutdoor unit Rooftop InstallationsSelect The Best Location Indoor unitEvap Moz/ft Piping Length And ElevationDrill a Hole In The Wall How To Mount Installation PlatePutting nut on Flaring WorkCut the pipes and the cable Burrs removalConnecting The Piping Indoor unit installationIndoor Tighten the flare nut with a wrench Wrap the insulation material around the connecting portionIndoor unit installation Insert the connecting cable into the indoor unitConnection Indoor Incorrect case Correct caseConnection Of Piping -Outdoor Connection Of The Drain HoseConnection Of The Cable Wiring DiagramRoom Air Conditioner Drain piping Checking The DrainageSeal small openings around pipings with a gum type sealer Forming The PipingLeak test Air PurgingAir purging With Vacuum Pump PreparationFinishing the job EvacuationBtu/h ChargingEvaluation of the performance Prepare remote controlTest Running Settlement of outdoor unitFunction of Controls Cooling Mode OperationHealthy Dehumidification Mode OperationDefrost Control Heating Mode OperationJet Cool Mode Operation H/P Model Sleep Timer OperationChaos Natural Wind Mode Jet Cool Mode Operation C/O ModelProtection of the evaporator pipe from frosting Forced operationTest operation Auto restartDisplay Function Self-diagnosis FunctionHeating Model Operation Mode Remote Control OperationsTo remove the Grille from the Chassis DisassemblyTo remove the Control Box To remove the Motor Cover Cooling & Heating Models Troubleshooting GuideRefrigeration Cycle Diagram Cooling Only ModelsWay Valve Liquid Side Way, 3-way ValvePumping Down ProcedureBalance Refrigerant of the 3-way Valve Vacuum pump After Evacuation Gas ChargingAdditional gas charging Method of using graphMethod of using equation According to Indoor & Outdoor TemperatureTrouble analysis Cycle PartsProduct does not operate at all Electronic Parts 9k modelElectronic Parts 18k model Product is not operate with the remote controller Compressor/Outdoor Fan are unable to drive.9k Model Compressor/Outdoor Fan are unable to drive.18k Model Nector When indoor Fan does not operateWhen Vertical Louver does not operate When a comunication error occurs Indoor Unit Phenomena in case of connecting errorOutdoor Unit Electric Control Device Schematic DiagramOutdoor 9k, 12k Outdoor 18k, 24k Wiring Diagram Models 9kC/O Models 12kH/P, 12kC/O, H/P Models 18kC/O Models 18kH/P, 24kC/O, H/P Components Location Outdoor9k, 12k Outdoor18k, 24k 6871A20680 6871A20681Cooling Only Product SpecificationsLS090HE LS120HE LS180HE LS240HE Cooling & HeatingExploded View Outdoor Unit 9k, 12k Btu/h Seriess 435512 W0CZZ-2 Outdoor Unit 18kH/P, 24k SeriessParts List Indoor Replacement Parts ListLSN180CE LSU120HE Parts List OutdoorReplacement Parts List LSU240HE No A20462V
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