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OWNER'S &
INSTALLATION MANUAL
AIR
CONDITIONER
Please read this manual carefully before operating your set and retain it for future
reference.
CEILING CASSETTE, CEILING CONCEALED DUCT
Original instruction
MFL67870342
Rev.05_012822
Copyright © 2019 - 2022 LG Electronics Inc. All Rights Reserved.
www.lg.com

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Table of Contents
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Summarization of Contents

SAFETY INSTRUCTIONS
Safety Symbols and Warnings
Explains safety symbols, categories, and general/electrical precautions.
INSTALLATION PLACES
Indoor Unit Placement
Specifies suitable locations and clearances for indoor unit installation.
Outdoor Unit Placement
Details recommended locations and considerations for outdoor unit placement.
THE INDOOR UNIT INSTALLATION
Indoor Unit Mounting and Positioning
Instructions for positioning mounting bolts and unit leveling.
Heat Insulation and Drain Piping
Drain Piping Installation
Instructions for proper installation and slope of drain piping.
WIRING CONNECTION
Electrical Wiring Procedures
Guidelines for electrical wiring compliance and unit connections.
CONNECTING PIPES
Piping Preparation and Connection
Procedures for preparing pipes and connecting them to units.
Connecting Pipings and Drain Hose
Steps for connecting indoor unit piping and drain hose.
Outdoor Piping Connection
Steps for connecting piping to the outdoor unit.
LEAKAGE TEST AND EVACUATION
Leakage Test and Evacuation Procedure
Steps to prepare, perform a leakage test, and evacuate the system.
TEST RUNNING
Test Running Precautions and Checks
Important considerations and checks before and during the test run.
SELF-DIAGNOSIS FUNCTION
Indoor Unit Error Codes
Lists error codes and their causes for the indoor unit.
DIP SWITCH SETTING FOR OUTDOOR UNIT
DIP Switch Functions
Explains functions and settings for outdoor unit DIP switches.
BEFORE USE
System Preparation, Usage, and Disposal
Covers system overview, operation, maintenance, and disposal.
PRODUCT INTRODUCTION
Parts Identification
Identifies and explains components of the indoor and outdoor units.
MAINTENANCE AND SERVICE
Indoor Unit Cleaning and Air Filters
Instructions for cleaning the indoor unit and its air filters.
Purifying Filter Maintenance
Filter Cleaning and Replacement
Steps for cleaning and replacing the optional purifying filter.
Operation Tips and Storage
Energy Saving and Storage
Advice on efficient operation, long-term storage, and resuming use.
Troubleshooting and Service
Problem Diagnosis and Service Calls
Guide to common issues, troubleshooting steps, and when to call for service.

Table of Contents