LG Multi V Service Manual

Air Conditioner
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication,
modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained
the prior written consent of the LG Electronics entity from which you received this Service Manual. The material
covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.
Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
SERVICE MANUAL (R410A)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
CONFIDENTIAL

LG Multi V Specifications

General

Type	VRF (Variable Refrigerant Flow)
Compressor Type	Scroll
Refrigerant	R410A
Energy Efficiency	High
Control System	Centralized and individual control options
Indoor Units	Multiple types available (e.g., ceiling cassette, wall-mounted, ducted)

Summary

Safety Precautions

Installation

Covers electrical work, grounding, and professional installation for safety.

Part 1 General Information

Model Names

Lists various indoor and outdoor unit model designations and their types.

External Appearance

Details the physical design and forms of different indoor unit types.

Nomenclature

Explains the coding system used for model names of indoor and outdoor units.

Part 2 Outdoor Units

ARU* Series

Introduces the ARU* series of outdoor units for detailed function explanation.

Function

Outlines the operational functions of the ARU* series outdoor units.

Part 3 HR Units

1. Specifications

Details technical specifications for HR units, including capacity, dimensions, and connections.

2. Parts Functions

Explains the function of various components within the HR unit system.

4. Piping Diagrams

Illustrates the refrigerant piping configurations for HR units.

5. Wiring Diagrams

Shows the electrical wiring connections for HR units.

6. Functions

Describes the operational functions and controls of the HR units.

Part 4 PCB Setting and Test Run

HR Unit PCB (PRHR**2A, ** : 04, 03, 02)

Covers switch setup, addressing, and valve configuration for specific HR unit PCB models.

HR Unit PCB (PRHR**3A, ** : 08, 06, 04, 03, 02)

Details switch setup, addressing, and valve configuration for different HR unit PCB models.

Test Run

Outlines pre-test run checks, abnormality handling, and setting verification for the system.

Part 5 Trouble shooting guide

1. The phenomena from main component failure

Lists common component failures, their causes, and troubleshooting methods.

2. Checking Method for Key Components

Provides detailed procedures for checking critical components like compressors and motors.

3. Self-diagnosis function

Explains error codes and their corresponding causes and troubleshooting steps.