Indoor Unit Electrical Connections Guidelines - LG LMN078HVT Installation & Maintenance

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Installation manual (55 pages)

Installation manual (54 pages)

Service manual (93 pages)

Table Of Contents

Table of Contents

MULTI

MAX

Power Wiring / Communications Cable Guidelines

• These instructions are for the IDU only. For ODU wiring, refer to the ODU installation manual.

• Confirm power source specifications.

• Confirm that the electrical capacity is sufficient.

• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.

• Confirm cable thickness specifications.

• It is recommended that a circuit breaker is installed, especially if conditions could become wet or moist.

• Include a disconnect in the power wiring system. Add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.

• A voltage drop may cause the following problems:

1. Magnetic switch vibration, fuse breaks, or disturbance to the

normal function of an overload protection device.

2. Compressor will not receive the proper starting current.

The general guidelines for connecting electrical and communication

cables are similar for all standard wall-mounted indoor units; how-

ever, the connections on the terminal block may differ. Depending

on your indoor unit, the location of the terminal block on the indoor

unit might vary from these typical images. Figure 53 shows typical

connections.

The electrical connections procedure includes wiring diagrams for

each type of standard wall-mounted indoor unit.

IDU Electrical Connections Procedure

• Be sure that main power to the unit is completely off before

beginning this procedure. Electric shock can cause severe physical

injury or death.

• Follow all safety and warning information outlined at the beginning

and throughout this manual. Failure to do so may cause bodily injury

or death.

Note:

• Follow all safety and warning information outlined at the beginning

and throughout this manual. Failure to do so may cause unit failure.

• Some units might require you to remove the Control Cover from

the terminal block area. Most Control Covers are attached with a

phillips screw.

• Connect the electrical cable to the indoor unit by connecting the

wires to the terminals on the control board individually according to

the outdoor unit connection. Be sure that the color of the wires at

the outdoor unit and the terminal numbers are the same as those

for the indoor unit.

• Loose wiring may cause unit malfunction, or the terminal to overheat

and catch fire. Terminal screws may become loose during transport.

Properly tighten the terminal connections during installation.

Due to our policy of continuous product innovation, some specifications may change without notification.

ELECTRICAL WIRING