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LG CQ12 NA0 User Manual

LG CQ12 NA0
146 pages
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Air Conditioner
SVC MANUAL(General)
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 CQ12 NA0 Specifications

General IconGeneral
TypeSplit System
Cooling Capacity12000 BTU/h
Power Supply220-240V, 50Hz
RefrigerantR410A
Compressor TypeRotary
Noise Level (Outdoor)50 dB

Summary

Part 1 General Information

Safety Precautions

Covers safety precautions, warnings, and cautions for unit servicing.

Model Line Up

Lists indoor and outdoor unit models with specifications and capacities.

Nomenclature

Explains the coding system for indoor and outdoor unit model names.

Part 2 Functions & Controls

List of Functions & Accessory

Details functions and accessories available for different indoor unit types.

Air Flow

Describes airflow modes like auto swing, chaos wind, jet cool, and swirl wind.

Air Purifying

Explains the PLASMA Air Purifying System for removing contaminants.

Installation Functions

Details functions like ESP setting and high ceiling operation for installation.

Reliability

Covers reliability features like hot start, self-diagnosis, and soft dry operation.

Convenience Functions & Controls

Explains user-friendly features like auto cleaning, sleep timer, and group control.

Special Function & KIT

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

Part 3 Basic Control

Normal Operation

Explains basic principles of controlling motor RPM via compressor frequency and voltage.

Compressor Control

Details compressor control logic using fuzzy control for stable system performance.

EEV (Electronic Expansion Valve) Control

Explains EEV operation with fuzzy control for superheat and discharge pipe temperature.

4. Trouble Shooting

Self-diagnosis Function

Describes unit self-diagnosis and error indicators for indoor and outdoor units.

Pump Down

Provides a step-by-step procedure for pump down operation, including settings and indicators.

Evacuation

Details refrigerant evacuation process using a vacuum pump to 0.8 Torr.

Gas Charging

Explains refrigerant charging procedure after evacuation, including hose connection.

Cycle Part

Discusses trouble analysis based on temperature difference and refrigeration cycle checks.

Electronic Parts Troubleshooting

Addresses issues with electronic parts and provides troubleshooting for common indoor unit errors.

Troubleshooting Outdoor Error

Details common outdoor unit errors, their causes, and diagnostic procedures.

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