LG Electronics LQN120HV4 User Manual

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Power Wiring / Communications Cable Guidelines

FOUR-WAY CEILING-CASSETTE INDOOR UNITS

Installation and Best Layout Practices

• Follow manufacturer’s circuit diagrams in the technical manuals.

• 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 required 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.

Refrigerant Piping Insulation

Field-installed vapor and liquid refrigerant piping lines must be

properly and completely covered in insulation (up to the indoor unit

piping connections). Any exposed piping will generate condensate or

will cause burns if touched. Insulation for this field-installed refriger-

ant piping must have a minimum heat resistance of 248°F.

Drain Piping Insulation

Drain piping must have insulation a minimum of 7/32 inches thick.

Installing the Insulation

1. Overlap the insulation at the connection of the field-installed piping and the indoor unit piping. Tape together so that no gaps exist.

2. Secure insulation to the rear piping housing section with vinyl tape.

3. Bundle the piping and drain hose with tape where they meet at the back of the indoor unit frame. Position the drain hose at the bottom of

the bundle (positioning the drain hose at the top of the bundle will cause the drain pan to overflow inside the indoor unit).

Figure 202:Insulating the Piping.

Ensure no gaps are present.

Overlap the Insulation at the

Connection

Insulation for Refrigerant Piping

(Field-Supplied)

Insulation for Field-Installed Piping

(Field-Supplied)

Insulating the Refrigerant and Drain Piping

Ensure all piping is insulated. Exposed piping can cause burns if touched.

Loose wiring will cause unit to malfunction, overheat, and catch re, resulting in severe injury or death.

• Terminal screws will become loose during transport. Properly tighten the terminal connections during installation.

A voltage drop will 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.

Due to our policy of continuous product innovation, some specications may change without notication.

154 | CEILING-CASSETTE

Multi F and Multi F MAX Indoor Unit Engineering Manual

MULTI

MAX

MULTI

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LG Electronics LQN120HV4 LG Air Conditioner Cooling Area, Adjustable Air Direction