Table of Contents | LG Electronics LA120CPO, LA120HPO, LA090HPO

Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions	3
Dimensions	9
Symbols Used in this Manual	9
Indoor Unit	9
Outdoor Unit	10
Product Specifications	11
Installation	12
Installation Parts	12
Installation Tools	12
Installtion Map	13
Confirm the Refrigerant	14
Select the best Locations	15
Piping Length and Elevation	16
Preparing Work for Installation	17
Fixing Indoor Unit	18
Flaring work and connection of piping	19
Flaring work	19
Connection of piping-Indoor	20
Connection of the drain hose	21
Connection of piping-Outdoor	23
Connecting the cable between indoor unit and outdoor unit	24
Connect the cable to the Indoor unit	24
Connection method of the connecting cable(Example)	25
Checking the drainage and forming the pipings	26
Checking the drainage	27
Forming the piping	28
AIR PURGING	29
Air purging	29
Charging	31
Panel front assembly	32
Test running	33
How to replace picture & photograph	35
Operation	36
Functions	36
The function of main control	37
Display Function	43
Self-diagnosis Function	43
Remote Control Operations	44
Disassembly	45
Indoor Unit	45
Schematic Diagram	47
Heat Pump/Cooling Only Series(Indoor Unit)	47
Heat Pump Series (Outdoor Unit)	48
INDOOR UNIT P.W.B. ASSEMBLY	49
OUTDOOR UNIT P.W.B. ASSEMBLY	50
DISPLAY P.W.B. ASM	51
Wiring Diagram	52
Troubleshooting Guide	54
Refrigeration Cycle Diagram	54
Pipe length and the elevation	55
3-way Valve	56
Cycle Parts	62
Electronic Parts	63
Exploded View	72
Replacement Parts List	74

2Room Air Conditioner

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LG Electronics LA120CPO, LA120HPO, LA090HPO, LA120HPI, LA120CPI service manual Table of Contents

Contents

Room Air Conditioner Table of Contents Do not use damaged power cords, plugs, or a loose socket Safety PrecautionsInstallation Install the panel and the cover Do not install the product on a defective installation stand Operation Do not use the product in a tight When flammable gas leaks, turnDo not place a heater or other Sounds, odors, or smoke comes Keep level even when installing That water is drained away prop Cial purposes, such as preserv Product when removingDo not use the product for spe Ing foods, works of art, etc. It is a It is not sanitary and could cause DisuseOutlet while the air conditioner is Indoor Unit DimensionsSymbols Used in this Manual Outdoor Unit 9k, 12k Models Product Specifications Models Installation Tools InstallationInstallation Parts Installation Map Confirm The Refrigerant This Product Contains R-410A Refrigerant Indoor unit Rooftop InstallationsSelect the best Location Outdoor unit Oil trap should be installed every 16.4~23feets 5~7 meters Piping Length and Elevation Cover pipe and cover side remove Preparing Work for InstallationOpen panel front Drain hose junction Case of nothing wrong, connect Pipe and the wire. Refer to installationFixing Indoor Unit Flaring work and connection of piping Flaring Work Indoor Connecting the PipingCheck Foamed polyethylene or equivalent is recommended Wrap the insulation material around the connecting portion Indoor unit tubing Flare nut Pipings For right piping. Follow the instruction below Good case Bad case Connection of Piping -Outdoor Connecting the Cables Connection method of the connecting cableExample How to connect wiring to the terminals Connecting the cable between indoor unit and outdoor unit Drain piping Checking the DrainageTo check the drainage Forming the Piping Air purging with vacuum pump Air PurgingAir purging Finishing the job Soap water methodEvacuation Charging Panel Front Assembly Settlement of outdoor unit Prepare remote controllerTest Running Evaluation of the performance Pump Down Procedure Pump Down How to replace picture & photograph Operation Functions Cooling Operation Mode Time delay Safety ControlChaos Swing Mode Function of main control Auto Operation Electronic control mode Auto Operation for Cooling Auto Operation for Heatingonly Heating Model Healthy DehumidificationAuto Operation for Dehumidificationonly Heating Model Heating Operation Modeonly Heating Model Hot-Start Control Heating Mode with the Sleep Modeonly Heating Model Cooling or Heating Mode with Sleep Mode Auto ControlCooling Mode with the Sleep Mode Cooling Heat pump Model Auto restartForced Operation Test operation Self-diagnosis Function Signal ReceptorDisplay Function Operation Indication Lamps Nd F Button Remote Control OperationsControls To remove the Control Box DisassemblyTo remove the Grille from the Chassis To remove the Motor To remove the Evaporator. Remove hole tubing holdeBefore removing the Turbo Fan Schematic Diagram Heat Pump/Cooling Only SeriesIndoor Unit Heat Pump Series/ Cooling Only Series Outdoor Unit Indoor Unit P.W.B. Assembly No A20999A PCB ASSEMBLY, Main Top View Bottom View Outdoor Unit P.W.B. Assembly No A20901C PCB ASSEMBLY, Main Top View Bottom View No A20921A PCB Assembly Display P.W.B. ASM Wiring Diagram Outdoor UnitCooling Only Models, & Heating Models Troubleshooting Guide Refrigeration Cycle Diagram Piping Length and Elevation Pumping Down ProcedureWay Valve Air purging of the charge hose Re-air purging Balance refrigerant of the 3-way valve Gas leakage Evacuation All amount of refrigerant leaked Connect the charge hose to the charging cylinder Gas ChargingAfter Evacuation Purge the air from the charge hose According to Indoor & Outdoor Temperature Method of using graphMethod of using equation Additional gas charging Cycle Parts Trouble analysis Electronic Parts 9k model Product does not operate at all Product is not operate with the remote controller Compressor/Outdoor Fan are unable to drive When indoor Fan does not operate Nector When Vertical Louver does not operate When a comunication error occurs Phenomena in case of connecting error Indoor Unit Outdoor Unit Voltage of Connectors according to Indoor Fan Speed RY-COMP-B Exploded View Indoor Unit Outdoor Unit Replacement Parts List Parts ListIndoor Parts ListOutdoor December No A20926C