Manuals / LG Electronics / Household Appliance / Air Conditioner

LG Electronics LA120CPI, LA120HPO, LA090HPO, LA120CPO, LA120HPI Indoor Unit P.W.B. Assembly

Models: LA120HPO LA120CPI LA120HPI LA090HPO LA120CPO

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Page 49

Schematic Diagram

INDOORUNIT P.W.B. ASSEMBLY

•P/No.: 6871A20999A (PCB ASSEMBLY, MAIN)

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Bottom View

Service Manual 49

Image 49

LG Electronics LA120CPI, LA120HPO, LA090HPO Indoor Unit P.W.B. Assembly, No A20999A PCB ASSEMBLY, Main Top View Bottom View

Contents

Room Air Conditioner Table of Contents Installation Safety PrecautionsDo not use damaged power cords, plugs, or a loose socket Install the panel and the cover Operation Do not install the product on a defective installation stand Do not place a heater or other When flammable gas leaks, turnDo not use the product in a tight Sounds, odors, or smoke comes That water is drained away prop Keep level even when installing Do not use the product for spe Product when removingCial purposes, such as preserv Ing foods, works of art, etc. It is a Outlet while the air conditioner is DisuseIt is not sanitary and could cause Symbols Used in this Manual DimensionsIndoor Unit 9k, 12k Models Outdoor Unit Models Product Specifications Installation Parts InstallationInstallation Tools Installation Map This Product Contains R-410A Refrigerant Confirm The Refrigerant Select the best Location Rooftop InstallationsIndoor unit Outdoor unit Piping Length and Elevation Oil trap should be installed every 16.4~23feets 5~7 meters Open panel front Preparing Work for InstallationCover pipe and cover side remove Drain hose junction Fixing Indoor Unit Pipe and the wire. Refer to installationCase of nothing wrong, connect Flaring Work Flaring work and connection of piping Check Connecting the PipingIndoor Foamed polyethylene or equivalent is recommended 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 To check the drainage Checking the DrainageDrain piping Forming the Piping Air purging Air PurgingAir purging with vacuum pump Evacuation Soap water methodFinishing the job Charging Panel Front Assembly Test Running Prepare remote controllerSettlement of outdoor unit Evaluation of the performance Pump Down Pump Down Procedure How to replace picture & photograph Functions Operation Chaos Swing Mode Time delay Safety ControlCooling Operation Mode Function of main control Auto Operation for Cooling Auto Operation Electronic control mode Auto Operation for Dehumidificationonly Heating Model Healthy DehumidificationAuto Operation for Heatingonly Heating Model Hot-Start Control Heating Operation Modeonly Heating Model Cooling Mode with the Sleep Mode Cooling or Heating Mode with Sleep Mode Auto ControlHeating Mode with the Sleep Modeonly Heating Model Forced Operation Auto restartCooling Heat pump Model Test operation Display Function Signal ReceptorSelf-diagnosis Function Operation Indication Lamps Controls Remote Control OperationsNd F Button To remove the Grille from the Chassis DisassemblyTo remove the Control Box Before removing the Turbo Fan To remove the Evaporator. Remove hole tubing holdeTo 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 Way Valve ProcedurePumping Down Air purging of the charge hose Re-air purging Gas leakage Balance refrigerant of the 3-way valve All amount of refrigerant leaked Evacuation After Evacuation Gas ChargingConnect the charge hose to the charging cylinder Purge the air from the charge hose Method of using equation Method of using graphAccording to Indoor & Outdoor Temperature Additional gas charging 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