LG FM17AH UL1 User Manual

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

LG FM17AH UL1 Specifications

General

Brand	LG
Model	FM17AH UL1
Category	Air Conditioner
Language	English

Summary

Part 1 General Information

Safety Precautions

Essential safety guidelines and warnings for servicing air conditioners.

Part 3 Control logic

Compressor Control Logic

Principles of compressor operation, starting, and frequency control.

Step(frequency) Control

How frequency is determined based on room conditions and system capacity.

Reversing Valve Operation

Discharge Pipe Control

Input Current Control

Defrost Control

LEV Control

Test Run Procedures

Check before Test Run

Pre-operation checks required before starting the test run procedure.

Test Run Flow chart

Step-by-step guide and decision points for conducting a successful test run.

Test Running

Trouble Shooting

Self-diagnosis Function

How to use the self-diagnosis system to identify and interpret error codes.

Pumping Down

Procedure for safely recovering refrigerant into the outdoor unit.

Evacuation

Process for removing air and moisture from the refrigerant system using a vacuum pump.

Gas Charging

Method for charging the system with the correct amount of refrigerant after evacuation.

Electronic Parts Troubleshooting