Wiring Guidelines - LG ARNU 073 SER2 Engineering Manual

Multi v wall-mounted indoor unit

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Table of Contents

general Power Wiring / communications cable guidelines

• Follow manufacturer's circuit diagrams displayed on the inside of the control box cover.

• Have a separate power supply for the indoor units.

• Provide a circuit breaker switch between the power source and the indoor unit.

• 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 name plate.

• Confirm wiring / cable thickness specifications:

• Power wiring is field supplied. Wire size is selected based on the larger MCA value, and must comply with the applicable local and

national codes.

• Communication cable must be a minimum of 18 AWG, two-conductor, stranded, shielded, and must comply with the applicable local

and national codes. Ensure the communication cable is properly grounded at the master outdoor unit only. Do not ground the ODU-IDU

communication cable at any other point.

• 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.

• Any openings where the field wiring enters the cabinet must be completely sealed.

• Terminal screws may loosen during transport. Properly tighten the terminal connections during installation or risk electric shock,

physical injury or death.

• Loose wiring may cause unit the wires to burnout or the terminal to overheat and catch fire. There is a risk of electric shock,

physical injury or death.

• Terminal screws may loosen during transport. Properly tighten the terminal connections during installation or risk equipment

malfunction or property damage.

• Loose wiring may cause unit malfunction, the wires to burnout or the terminal to overheat and catch fire. There is a risk of equip-

ment malfunction or property damage.

A voltage drop may cause the following problems:

• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.

• Compressor will not receive the proper starting current.

Power Wiring and communications cable connections

1. Insert the power wiring / communications cable from the outdoor unit or heat recovery unit (Heat Recovery systems only) using the desig-

nated path in the indoor unit.

2. Connect each wire to its appropriate terminal on the indoor unit control board. Verify that the color and terminal numbers from the outdoor

unit or heat recovery unit (Heat Recovery systems only) wiring match the color and terminal numbers on the indoor unit.

3. Secure the power wiring / communications cable.

Figure 41: Location of Power Wiring / Communications Cable Terminals in

SE and S8 Frame Standard Wall-Mounted Indoor Units.

Lock nut

Conduit

mounting

plate

1(L1) 2(L2)

3(A)

4(B)

Power Supply

Communication

High Voltage

(208/230V)

Lock nut

Conduit

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

aPPlIcatIon guIdelIneS

Figure 42: Location of Power Wiring / Communications Cable Terminals

in SB and SC Frame Standard Wall-Mounted Indoor Units.

Lock nut

Conduit

mounting

plate

3(A)

4(B)

1(L)

2(N)

Conduit

mounting

plate

Communication

Power Supply

High Voltage

(208/230V)