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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.
TYPE : High Efficiency Inverter
P/NO : MFL40910618
www.lg.com
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Summarization of Contents
Installation of Outdoor Unit
Installation Places
Guidelines for selecting an optimal location for the outdoor unit to ensure proper function and minimize disturbance.
Piping Length and Elevation
Specifications for pipe length and elevation differences between indoor and outdoor units for optimal performance.
Synchro Operation
Procedures and specifications for connecting multiple indoor units to a single outdoor unit for synchronized operation.
Refrigerant Additional Charging Method
Instructions for calculating and adding refrigerant based on pipe length and diameter for optimal system performance.
Synchro Combination Table
A table detailing compatible indoor and outdoor unit combinations for synchro operation systems.
PCB Setting for Simultaneous Operation
Procedure for setting DIP switches on the outdoor unit PCB for auto-addressing in multi-unit systems.
Night Silent Operation Setting
Instructions on configuring the DIP switch for the 'Night Silent Operation' feature on the outdoor unit.
Wiring Connection
Electrical Wiring Requirements
Guidelines for electrical wiring, power source selection, and circuit breaker requirements for safe installation.
Indoor-Outdoor Unit Cable Connection
Detailed instructions on connecting cables between indoor and outdoor units, ensuring correct terminal and wire color matching.
Power Cord and Connecting Cable Specifications
Compliance requirements for power cords and connecting cables with relevant standards and precautions for wire thickness.
Power Wiring Precautions
Best practices for laying power wiring, including using round pressure terminals and ensuring screw tightness.
Connecting Cable to Outdoor Unit
Step-by-step guide for connecting the main cable to the outdoor unit, including earthing procedures and clamp usage.
Connecting Pipes
Preparation of Piping
Procedures for cutting pipes, removing burrs, and preparing flare nuts for leak-free connection.
Flaring Work and Check
Detailed instructions on performing flaring work using a dedicated tool and checking the quality of the flare.
Connecting Pipes to Outdoor Unit
Steps for connecting the pipes to the outdoor unit, including tightening flare nuts with a torque wrench.
Preventing Foreign Objects Entry
Methods to prevent foreign objects and insects from entering the outdoor unit through piping holes.
Forming the Piping
Instructions on insulating and securing pipes and drain hoses for both below and above outdoor unit installations.
Leakage test and Evacuation
Preparation for Leakage Test
Steps to prepare the system, including checking connections and removing service valve caps before the leakage test.
Performing Leakage Test
Procedure for pressurizing the system with nitrogen gas and checking for leaks using liquid soap.
Evacuation Procedure
Instructions for using a vacuum pump to remove air and moisture from the refrigerant system to achieve a specific vacuum level.
Finishing the Job
Steps to complete the process after evacuation, including opening valves and securing service ports to prevent leakage.
Test running
Precautions in Test Running
Essential safety precautions and procedures to follow before and during the test run of the air conditioner.
Installation Completion Check
A checklist of items to verify after installation, including measurements and visual inspections for proper operation.
Power Supply Connection
Instructions for connecting the power supply cord and operating the unit for the initial test run.
Performance Evaluation
Methods for measuring and evaluating the air conditioner's performance during the test run, focusing on temperature differences.
Final Wiring Preparation and Precautions
Final checks and precautions for wiring, power source, voltage, and specific operating conditions like simultaneous operation.
Hand Over Procedure
Guidance on teaching the customer operation and maintenance procedures after installation is complete.
Self-diagnosis Function
Outdoor Error Indicator
Explanation of LED indicators on the outdoor unit PCB and a table of error codes with their descriptions.
Installation Guide at the Seaside
Selecting Outdoor Unit Location
Guidelines for installing the outdoor unit in seaside locations, focusing on avoiding sea wind and ensuring proper drainage.
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