LG Electronics LA090HPO, LA120HPO, LA120CPO, LA120HPI Display P.W.B. ASM, No A20921A PCB Assembly

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Schematic Diagram

DISPLAYP.W.B. ASM

• P/No.: 6871A20921A (PCB ASSEMBLY)

Service Manual 51

Image 51

Contents Room Air Conditioner Table of Contents Install the panel and the cover Safety PrecautionsInstallation Do not use damaged power cords, plugs, or a loose socketOperation Do not install the product on a defective installation standSounds, odors, or smoke comes When flammable gas leaks, turnDo not place a heater or other Do not use the product in a tightThat water is drained away prop Keep level even when installingIng foods, works of art, etc. It is a Product when removingDo not use the product for spe Cial purposes, such as preservDisuse Outlet while the air conditioner isIt is not sanitary and could cause Dimensions Symbols Used in this ManualIndoor Unit 9k, 12k Models Outdoor UnitModels Product SpecificationsInstallation Installation PartsInstallation Tools Installation Map This Product Contains R-410A Refrigerant Confirm The RefrigerantOutdoor unit Rooftop InstallationsSelect the best Location Indoor unitPiping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 metersDrain hose junction Preparing Work for InstallationOpen panel front Cover pipe and cover side removePipe and the wire. Refer to installation Fixing Indoor UnitCase of nothing wrong, connect Flaring Work Flaring work and connection of pipingFoamed polyethylene or equivalent is recommended Connecting the PipingCheck IndoorIndoor unit tubing Flare nut Pipings Wrap the insulation material around the connecting portionBad case For right piping. Follow the instruction below Good caseConnection of Piping -Outdoor Connecting the Cables How to connect wiring to the terminals Connection method of the connecting cableExampleConnecting the cable between indoor unit and outdoor unit 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 Charging Panel Front Assembly Evaluation of the performance Prepare remote controllerTest Running Settlement of outdoor unitPump Down Pump Down ProcedureHow to replace picture & photograph Functions OperationFunction of main control Time delay Safety ControlChaos Swing Mode Cooling Operation ModeAuto Operation for Cooling Auto Operation Electronic control modeHealthy Dehumidification Auto Operation for Dehumidificationonly Heating ModelAuto Operation for Heatingonly Heating Model Hot-Start Control Heating Operation Modeonly Heating ModelCooling or Heating Mode with Sleep Mode Auto Control Cooling Mode with the Sleep ModeHeating Mode with the Sleep Modeonly Heating Model Test operation Auto restartForced Operation Cooling Heat pump ModelOperation Indication Lamps Signal ReceptorDisplay Function Self-diagnosis FunctionRemote Control Operations ControlsNd F Button Disassembly To remove the Grille from the ChassisTo remove the Control Box To remove the Evaporator. Remove hole tubing holde Before removing the Turbo FanTo remove the Motor Heat Pump/Cooling Only SeriesIndoor Unit Schematic DiagramHeat Pump Series/ Cooling Only Series Outdoor Unit No A20999A PCB ASSEMBLY, Main Top View Bottom View Indoor Unit P.W.B. AssemblyNo A20901C PCB ASSEMBLY, Main Top View Bottom View Outdoor Unit P.W.B. AssemblyDisplay P.W.B. ASM No A20921A PCB AssemblyWiring Diagram Outdoor UnitCooling Only Models, & Heating Models Refrigeration Cycle Diagram Troubleshooting GuidePiping Length and Elevation Air purging of the charge hose ProcedureWay Valve Pumping DownRe-air purging Gas leakage Balance refrigerant of the 3-way valveAll amount of refrigerant leaked EvacuationPurge the air from the charge hose Gas ChargingAfter Evacuation Connect the charge hose to the charging cylinderAdditional 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 modelProduct is not operate with the remote controller Compressor/Outdoor Fan are unable to drive 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 RY-COMP-B Voltage of Connectors according to Indoor Fan SpeedIndoor Unit Exploded ViewOutdoor Unit Parts ListIndoor Replacement Parts ListParts ListOutdoor December No A20926C