LG ARUN120LTE4 User Manual

P/NO : MFL67221412
www.lg.com
Original instruction
INSTALLATION MANUAL
AIR CONDITIONER
• Please read this installation manual completely before installing the product.
• Installation work must be performed in accordance with the national
wiring standards by authorized personnel only.
• Please retain this installation manual for future reference after reading
it thoroughly.your set and retain it for future reference.
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LG ARUN120LTE4 Specifications

General

Brand	LG
Model	ARUN120LTE4
Category	Air Conditioner
Language	English

Summary

IMPORTANT SAFETY INSTRUCTIONS

Installation Safety

Guidelines for safe installation, grounding, and circuit requirements.

Operation Safety

Precautions for safe operation, including power, water, and handling.

INSTALLATION PROCESS

Refrigerant piping work

Ensuring dryness, cleanness, and tightness of refrigerant piping.

Electrical work

Correctly connecting electrical circuits and drive circuits for the unit.

Airtight test

Performing an airtight test to ensure no pressure drop in the system.

Vacuum drying

Evacuating the system to a specific vacuum level to remove moisture.

Additional charge of refrigerant

Correctly calculating and charging additional refrigerant for system operation.

SELECT THE BEST LOCATION

Outdoor Unit Installation

Foundation for Installation

Preparation of Piping

Procedure for preparing pipes, emphasizing correct flaring work.

REFRIGERANT PIPING INSTALLATION

Precautions on Pipe connection / Valve operation

Steps for connecting pipes and operating valves correctly.

PIPE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNIT

Refrigerant piping system

Pipe Connection Method between outdoor unit/indoor unit

Explains pipe diameter selection based on capacity and length.

Pipe Connection Method/Precautions for Series connections between Outdoor units

Pipe connection between outdoor units (General Case)

Examples of Wrong Pipe Connections

The amount of Refrigerant

Refrigerant charging

Distribution Method

Horizontal Distribution

Vertical Distribution

Leak Test and Vacuum drying

Vacuum Mode

Vacuum mode setting method

Steps for setting the vacuum mode using DIP switches and buttons.

Vacuum mode off method

Procedure to turn off the vacuum mode after completion.

ELECTRICAL WIRING

Caution

General cautions regarding electrical work compliance with regulations.

WARNING

Warnings about using authorized engineers and proper wiring practices.

CAUTION

Cautions about grounding and avoiding electrical interference.

Control box and connecting position of wiring

Wiring of main power supply and equipment capacity

The thickness of Minimum wire (mm²)

Ground wire

Communication and Power Cables

Communication cable

Separation of communication and power cables

Field Wiring

Single outdoor unit

Series outdoor units

Automatic Addressing

Checking the setting of outdoor units

Checking the initial display

The Procedure of Automatic Addressing

Step-by-step guide for performing automatic addressing.

Setting the function

How to select and set various functions using buttons and DIP switches.

Cool & Heat selector

Group Number setting

Group Number setting for Indoor Units

How to set group numbers for indoor units using a wired remote.

Setting the ODU address

IDU capacity adjusting

Comfort Operation

Target pressure adjusting

Mode setting method

Method for adjusting target pressure using DIP switches.

Self-Diagnosis Function

Error Indicator

Explains error display and codes for self-diagnosis.

Indoor unit related error

Outdoor unit related error

Outdoor unit related error

CAUTION FOR REFRIGERANT LEAK

Checking procedure of limiting concentration

Steps to check refrigerant concentration and ensure safety.