Display P.W.B. ASM | LG Electronics LA090HPO, LA120HPO, LA120CPO

Schematic Diagram

DISPLAYP.W.B. ASM

• P/No.: 6871A20921A (PCB ASSEMBLY)

Service Manual 51

Image 51

LG Electronics LA090HPO, LA120HPO, LA120CPO, LA120HPI, LA120CPI service manual Display P.W.B. ASM, No A20921A PCB Assembly

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 socket Operation Do not install the product on a defective installation stand Sounds, odors, or smoke comes When flammable gas leaks, turnDo not place a heater or other Do not use the product in a tight That water is drained away prop Keep level even when installing Ing foods, works of art, etc. It is a Product when removingDo not use the product for spe Cial purposes, such as preserv Disuse Outlet while the air conditioner isIt is not sanitary and could cause Dimensions Symbols Used in this ManualIndoor Unit 9k, 12k Models Outdoor Unit Models Product Specifications Installation Installation PartsInstallation Tools Installation Map This Product Contains R-410A Refrigerant Confirm The Refrigerant Outdoor unit Rooftop InstallationsSelect the best Location Indoor unit Piping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 meters Drain hose junction Preparing Work for InstallationOpen panel front Cover pipe and cover side remove Pipe and the wire. Refer to installation Fixing Indoor UnitCase of nothing wrong, connect Flaring Work Flaring work and connection of piping Foamed polyethylene or equivalent is recommended Connecting the PipingCheck Indoor Indoor unit tubing Flare nut Pipings Wrap the insulation material around the connecting portion Bad case For right piping. Follow the instruction below Good case Connection of Piping -Outdoor Connecting the Cables How to connect wiring to the terminals Connection method of the connecting cableExample Connecting 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 unit Pump Down Pump Down Procedure How to replace picture & photograph Functions Operation Function of main control Time delay Safety ControlChaos Swing Mode Cooling Operation Mode Auto Operation for Cooling Auto Operation Electronic control mode Healthy Dehumidification Auto Operation for Dehumidificationonly Heating ModelAuto Operation for Heatingonly Heating Model Hot-Start Control Heating Operation Modeonly Heating Model Cooling 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 Model Operation Indication Lamps Signal ReceptorDisplay Function Self-diagnosis Function Remote 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 Diagram Heat Pump Series/ Cooling Only Series Outdoor Unit No A20999A PCB ASSEMBLY, Main Top View Bottom View Indoor Unit P.W.B. Assembly No A20901C PCB ASSEMBLY, Main Top View Bottom View Outdoor Unit P.W.B. Assembly Display P.W.B. ASM No A20921A PCB Assembly Wiring Diagram Outdoor UnitCooling Only Models, & Heating Models Refrigeration Cycle Diagram Troubleshooting Guide Piping Length and Elevation Air purging of the charge hose ProcedureWay Valve Pumping Down Re-air purging Gas leakage Balance refrigerant of the 3-way valve All amount of refrigerant leaked Evacuation Purge the air from the charge hose Gas ChargingAfter Evacuation Connect the charge hose to the charging cylinder Additional gas charging Method of using graphMethod of using equation According to Indoor & Outdoor Temperature Trouble analysis Cycle Parts Product does not operate at all Electronic Parts 9k model Product is not operate with the remote controller Compressor/Outdoor Fan are unable to drive Nector When indoor Fan does not operate When Vertical Louver does not operate When a comunication error occurs Indoor Unit Phenomena in case of connecting error Outdoor Unit RY-COMP-B Voltage of Connectors according to Indoor Fan Speed Indoor Unit Exploded View Outdoor Unit Parts ListIndoor Replacement Parts List Parts ListOutdoor December No A20926C