Electrical Connections - LG LD097HV4 Engineering Manual

ELECTRICAL CONNECTIONS

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.
• Properly ground the outdoor unit and the indoor unit per NEC and local codes.
• Connect the wiring firmly so that the wires cannot be easily pulled out.
• Confirm that the electrical capacity is sufficient.
• Power supply to the outdoor unit must be selected based on NEC and local codes. Maximum allowable voltage fluctuation ±10% or name-
plate rated value.
• 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.
Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the indoor unit in the same conduit.
Use separate conduits.
Communication / Connection (Power) Cable Specifications from Outdoor
Unit to Indoor Unit
• Power wiring to the outdoor unit must be solid or stranded, and must comply with the applicable local and national electric codes.
• For communication / connection (power) wires between the Single Zone outdoor unit and the indoor unit, use a minimum 14 gauge, four
(4) conductor, stranded, shielded or unshielded wire. If shielded, the wire must be grounded to the chassis at the outdoor unit only. Wiring
must comply with all applicable local and national codes.
• Communication cable from indoor unit to remote controller(s) is to be 22 AWG, 3-conductor, twisted, stranded, unshielded. Wiring must
comply with all applicable local and national codes.
• Insulation material as required by local code.
• Firmly attach the cable; provide slack but secure in a way to prevent external forces from being imparted on the terminal block.
• Wiring must be completed without splices.
• Terminal screws may become loose during transport. Properly tighten the terminal connections during installation or risk electric shock,
physical injury, or death.
• Loose wiring may cause unit to malfunction, overheat, and catch fire, resulting in severe 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 equipment
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.
40 | DUCTED Due to our policy of continuous product innovation, some specifications may change without notification.
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