Variable Refrigerant Flow Outdoor Units - 6.0 to 42.0 Tons - Service manual

Oct 22, 2026

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Service manual for Variable Refrigerant Flow outdoor units covering a capacity range of 6.0 to 42.0 tons. The document provides proprietary and safety guidance, emphasizing correct installation and instructions to prevent malfunction, property damage, injury, or death. It organizes technical information including nomenclature, wiring and refrigerant flow diagrams, outdoor unit functions, control methods, protection controls, PCB and DIP switch settings, test runs, diagnostics, component checks, and extensive error code tables.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages235

Reading Time9 h 52 min

AccessFree to download

Safety Precautions

Nomenclature

Wiring Diagrams

Refrigerant Flow Diagrams

Outdoor Unit Functions

Basic Control

Normal Operation/Compressor Control

Master-Slave EEVs/Fan Motor Control

Special Control

Oil Return Control

Defrost Control/Partial Defrost Control

Stop Operation/Oil Equalizing

Protection Control

Pressure Protection Control

Discharge Temperature/Inverter Protection

Other Controls

Initial Setup

Quick Control

Setting Optional Modes

Heat Recovery Units

Parts Functions

Dimensional Diagrams

Wiring Diagram

Refrigerant Circuit Diagram

Functions

PCB Settings

Outdoor Unit DIP Switch Settings

Heat Recovery Unit Settings

Indoor Unit Addressing

Pipe Detection Addressing

Troubleshooting Main Components

Test Run

Main Component Errors

Self Diagnostics Check

Checking Components

Error Codes

Error Code General Information

Error Code Tables

Error Codes

Replacing/Checking Electrical Components

Replacing the Inverter PCB Heat Sink

Checking Input Voltage and DC Voltage

SERVICE MANUAL Variable Refrigerant Flow Outdoor Units 6.0 to 42.0 Tons PROPRIETARY DATA NOTICE This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A. , Inc. , and are disclosed by LG Electronics U.S.A. , Inc. only in confidence. Do not throw away, destroy, or lose this manual. Please read carefully and store in a safe place for future reference. Content familiarity is required for proper installation. The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described by the summary list of safety precautions on page 4. For more technical materials such as submittals, catalogs, engineering, installation, best practices, and owner’s manuals, [visit www.lghvac.com](visit www.lghvac.com). For continual product development, LG Electronics U. S.A. , Inc. reserves the right to change specifications without notice. © LG Electronics U. S.A. , Inc. TABLE OF CONTENTS Safety Precautions ............................................................................. 4-7 Nomenclature......................................................................................... 8 Wiring Diagrams ............................................................................... 9-16 Refrigerant Flow Diagrams............................................................ 17-42 Outdoor Unit Functions ................................................................. 43-87 Basic Control ................................................................................ 43-44 Normal Operation/Compressor Control ......................................... 43 Master-Slave EEVs/Fan Motor Control ......................................... 44 Special Control ............................................................................. 45-47 Oil Return Control .......................................................................... 45 Defrost Control /Partial Defrost Control ........................................ 46 Stop Operation / Oil Equalizing ..................................................... 47 Protection Control......................................................................... 48-49 Pressure Protection Control .......................................................... 48 Discharge Temperature/Inverter Protection ................................... 49 Other Controls .............................................................................. 50-53 Initial Setup............................................................................... 50-53 Quick Control ................................................................................. 53 Setting Optional Modes ................................................................ 54-87 Heat Recovery Units....................................................................... 88-95 Parts Functions .................................................................................. 88 Dimensional Diagrams ................................................................. 89-91 Wiring Diagram .................................................................................. 92 Refrigerant Circuit Diagram ............................................................... 93 Functions ...................................................................................... 94-95 PCB Settings ................................................................................. 96-110 Outdoor Unit DIP Switch Settings...................................................... 96 Heat Recovery Unit Settings ...................................................... 97-102 Indoor Unit Addressing ....................................................

FAQs

What is the purpose of this service manual for LG Variable Refrigerant Flow outdoor units?

It provides technical instructions and guidance for installation, wiring, control functions, diagnostics, and troubleshooting of the outdoor units within the stated tonnage range.

Why are the safety precautions and correct installation familiarity required?

The manual states that familiarity is required for proper installation and that following the instructions prevents product malfunction, property damage, injury, or death.

What kinds of diagrams and technical references are included?

The contents list nomenclature, wiring diagrams, refrigerant flow diagrams, and additional sectional diagram references for outdoor unit functions and heat recovery units.

How are troubleshooting and errors handled in the manual?

The manual includes test run procedures, self-diagnostics checks, component checking steps (such as compressors, fan motors, expansion valves, inverter components, sensors, and valves), and extensive error code tables and error code sections.

Oct 22, 2026

Upload by GGG