Table of Contents
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LG
Room Air Conditioner
SERVICE MANUAL
MODELS: AS-H0766KA2
AS-H0966KA2
AS-H126RKA2
AS-H186TKA2
LS-H246TKA2
website http://biz.LGservice.com
LS-H0766KA2
LS-C0966KA2
LS-H0966KA2
LS-C126RKA2
LS-H126RKA2
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
LG
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Table of Contents
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Summarization of Contents
Safety Precautions
Installation Safety Guidelines
Safety instructions for installing the air conditioner unit.
Dimensions
Symbols Used in this Manual
Explanation of symbols used in the manual for clarity.
Indoor Unit Dimensions
Detailed dimensions and specifications for the indoor unit.
Outdoor Unit Dimensions
Detailed dimensions and specifications for the outdoor unit.
Installation
Selection of the Best Location
Guidelines for choosing the optimal placement for indoor and outdoor units.
Rooftop Installations
Specific considerations for installing units on a roof structure.
Piping Length and Elevation
Recommended piping lengths and elevation differences for system reliability.
How to Fix Installation Plate
Instructions for securely mounting the installation plate on the wall.
Drill a Hole in the Wall
Procedure for drilling the necessary hole for piping through the wall.
Drain Hose Connection
Steps for connecting the drain hose correctly.
Flaring Work and Piping Connection
Flaring Work Procedure
Steps and guidelines for performing correct flaring work on pipes.
Burr Removal
How to properly remove burrs from cut pipe ends.
Placing Flare Nuts
Instructions for placing flare nuts on pipes before flaring.
Indoor Piping Connection
Procedure for connecting pipes to the indoor unit.
Right Rear Piping Connection
Connecting pipes and drain hose for right rear installation.
Connecting Unit Pipings and Drain Hose
Detailed steps for connecting unit pipings and drain hose.
Insulating Connecting Portion
How to properly insulate the connecting pipe area.
Left Rear Piping Connection
Connecting pipes and drain hose for left rear installation.
Indoor Unit Installation Steps
Steps for mounting the indoor unit onto the installation plate.
Left Piping Installation Information
Specific instructions for installing piping on the left side.
Outdoor Piping Connection
Procedure for connecting pipes to the outdoor unit.
Connecting Indoor and Outdoor Unit Cables
Connect Cable to Indoor Unit
Instructions for connecting the electrical cable to the indoor unit.
Connect Cable to Outdoor Unit
Instructions for connecting the electrical cable to the outdoor unit.
Drainage and Piping Formation
Checking Drainage
Procedure to verify proper water drainage from the indoor unit.
Drain Hose Installation
Guidelines for installing the drain hose for correct flow.
Forming the Piping
Steps to insulate and secure the piping connections.
Air Purging
Air Purging Process
Understanding the effects of air and moisture in the refrigerant system.
Air Purging with Vacuum Pump
Procedure for purging air using a vacuum pump.
Soap Water Leak Test Method
Method for checking refrigerant leaks using soap water.
Evacuation Procedure
Steps for evacuating the system using a vacuum pump.
Finishing the Job
Final steps after air purging and evacuation.
Test Running
Outdoor Unit Settlement
Guidelines for properly anchoring and mounting the outdoor unit.
Performance Evaluation
Checking system refrigerant charge and performance after operation.
Pump Down Procedure
Steps to collect refrigerant for relocation or servicing.
Operation
Function of Controls
Explanation of various indicators and operational modes.
Cooling Mode Operation
Details on how the unit operates in cooling mode.
Healthy Dehumidification Mode
Operation specifics for the dehumidification mode.
Heating Mode Operation
Details on how the unit operates in heating mode.
Defrost Control
Mechanism and conditions for defrost control.
Airflow Speed Selection
How to adjust indoor fan speed using the remote control.
Sleep Timer Operation
Using the sleep timer function for automatic operation stops.
Chaos Natural Wind Mode
Operation of the natural wind simulation mode.
Jet Cool Mode Operation
Activating and operating the fast cooling 'Jet Cool' mode.
Forced Operation Mode
Operating the unit without a remote control using the power button.
Test Operation
Performing a short operational test of the unit.
Auto Restart Function
How the unit resumes operation after a power failure.
Evaporator Frost Protection
Mechanism to protect the evaporator from freezing.
Buzzer Sounding Operation
Understanding the unit's buzzer sounds for different actions.
Display Function
Heating Model Indicators
Explanation of indicators for heating model operation.
Cooling Model Indicators
Explanation of indicators for cooling model operation.
Self-Diagnosis Function
How to use the self-diagnosis feature for error detection.
Remote Control Operations
Operation Modes Overview
Displaying the available operation modes on the remote control.
Operation Procedure Steps
Sequence of button presses for setting operations.
Disassembly
Indoor Unit Disassembly
Step-by-step guide for disassembling the indoor unit.
Schematic Diagram
Electric Control Device Diagram
Circuit diagram for the electric control device.
Wiring Diagram
Indoor Unit Wiring
Wiring diagrams for the indoor unit models.
Outdoor Unit Wiring
Wiring diagrams for the outdoor unit models.
Components Location
Main PWB Assembly Layout
Identification of components on the main PWB assembly.
Display Assembly Layout
Identification of components on the display assembly.
Troubleshooting Guide
Refrigeration Cycle Diagram
Diagrams illustrating the refrigeration cycle for different models.
2-way and 3-way Valve Operation
Details on shaft positions and service port for valves during various works.
Pumping Down Procedure
Detailed steps for pumping down refrigerant.
Balance Refrigerant (Gas Leakage)
Procedure for balancing refrigerant, focusing on gas leakage.
Evacuation Procedure
Steps for evacuating the system to remove all leaked refrigerant.
Gas Charging Procedure
Steps for charging the system with refrigerant after evacuation.
Additional Gas Charging
Recharging refrigerant due to leakage, using graphs or equations.
Operating Suction Pressure Graph
Graph showing suction pressure based on indoor and outdoor temperatures.
Operating Suction Pressure Equation
Equation to calculate suction pressure based on temperature inputs.
Cycle Parts Analysis
Trouble Analysis
Analyzing common issues based on temperature difference and operating current.
Electronic Parts Troubleshooting
Product Not Operating (No Beep)
Troubleshooting steps when the product does not operate at all.
Product Not Operating with Remote
Troubleshooting steps when the remote control is unresponsive.
Compressor/Outdoor Fan Not Driving
Troubleshooting steps when the compressor or outdoor fan fails to operate.
Indoor Fan Not Operating
Troubleshooting steps when the indoor fan does not operate.
Vertical Louver Not Operating
Troubleshooting steps when the vertical louvers do not move.
Heating Mode Not Operating
Troubleshooting steps when the heating mode fails to function.
Exploded View
Indoor Unit Exploded View
Diagram showing the breakdown of the indoor unit components.
Outdoor Unit (7, 9, 18K Btu/h) Exploded View
Component breakdown diagram for specific outdoor unit models.
Outdoor Unit (12k Btu/h) Exploded View
Component breakdown diagram for the 12k Btu/h outdoor unit.
Outdoor Unit Exploded View
General exploded view of outdoor unit components.
Replacement Parts List
Indoor Unit Parts List
List of part numbers for indoor unit components.
Outdoor Unit Parts List
List of part numbers for outdoor unit components.
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