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LG LMU24CHV Service Manual

LG LMU24CHV
113 pages
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Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Internal Use Only
http://biz.lgservice.com

Table of Contents

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LG LMU24CHV Specifications

General IconGeneral
Cooling Capacity24000 BTU/h
Heating Capacity27000 BTU/h
RefrigerantR410A
Voltage208/230V
Power Supply208/230V, 60Hz
Outdoor Unit Noise Level54 dB

Summary

Part 1 General Information

Safety Precautions

Safety instructions and warnings for operation and repair.

Model Line Up

Overview of different indoor and outdoor unit models and their configurations.

Nomenclature

Explanation of model naming conventions for units and components.

Part 2 Functions & Controls

List of Functions & Accessory

Detailed list of functions and accessories available for indoor and outdoor units.

Air Flow

Explains different airflow modes like auto swing, chaos swing, and jet cool.

Air Purifying

Details the PLASMA Air Purifying System and its operation.

Installation Functions

Describes the E.S.P. (External Static Pressure) setting for installation.

Reliability

Explains features related to reliability like hot start and self-diagnosis.

Convenience Functions & Controls

Covers various user-friendly functions like auto cleaning, auto operation, and timers.

Special Function & KIT

Details special functions like low ambient control and auto elevation grille.

Part 3 Basic Control

Normal Operation

Describes the basic principles of controlling the unit's operation.

Compressor Control

Explains how the compressor operation is controlled using fuzzy logic.

EEV Control

Details the control logic for the Electronic Expansion Valve.

Oil Return Control

Explains the procedure for oil return operation in the refrigeration cycle.

Defrost Control

Describes how the defrost operation is managed to prevent ice buildup.

Protection Control

Outlines various protection mechanisms like high/low pressure and temperature controls.

Part 4 Test Run

Check Before Test Run

Essential checks to perform before initiating a test run.

Test Run Flow Chart

A visual guide detailing the steps for conducting a test run.

Test Running

Procedures and precautions for performing test runs on different unit types.

Part 5 Trouble Shooting

Self-Diagnosis Function

Explains the self-diagnosis feature and error indicators for indoor and outdoor units.

Pump Down

Procedure for gathering refrigerant into the ODU for maintenance.

Evacuation

Steps for evacuating the system to remove air and moisture.

Gas Charging

Procedure for charging the system with the correct amount of refrigerant.

Cycle Part

Analysis of issues related to the refrigeration cycle based on temperature and current.

Product Not Operating

Troubleshooting steps when the product does not operate at all.

Remote Controller Issues

Diagnosing problems when the product does not operate with the remote controller.

Compressor/Fan Not Operating

Troubleshooting steps for when the compressor or outdoor fan does not operate.

Indoor Fan Issues

Steps to diagnose and fix problems with the indoor fan operation.

Louver Malfunction

Troubleshooting for when the unit's louvers do not operate correctly.

Troubleshooting Indoor Error

Detailed guide for troubleshooting specific indoor unit error codes.

Troubleshooting Outdoor Error

Detailed guide for troubleshooting specific outdoor unit error codes.

Part 6 Service Order

PCB Service Order

Step-by-step guide for ordering and replacing PCB components.

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