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Electrical Wiring
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ELECTRICAL WIRING
• If power wires are not properly terminated and firmly attached, there is risk of fire, electric shock, and physical injury or death.
• Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.
Power Wiring Specications and Best Practices
Power Supply / Power Wiring Specifications - Continued
Communication Cables Between the Single Zone Unit and the Controller
• AC Ez or Simple Central Controller: field-provided, 18 gauge, stranded four-conductor communication cable (shielded).
• All other Central Controllers: field-provided, 18 gauge, stranded two-conductor communication cable (shielded).
• Insulation material as recommended by local code.
• Connect all central control devices such as AC Smart II, AC Smart Premium, ACP, BACnet® and LonWorks® gateways, and energy recovery
ventilators all on the same cable. Order does not matter. Polarity does. Keep “A” terminals with “A” terminals, and “B” terminals with “B” terminals.
• Starting at the outdoor unit, terminate the cable on terminals Internet A and Internet B. Route the cable as needed between each device.
• Use a four (4) conductor, shielded, stranded cable between the
Single Zone outdoor unit and the indoor unit.
• Minimum 18 gauge shielded CVVS or CPEVS cable.
• Insulation material as required by local code.
• Rated for continuous exposure of temperatures up to 140 °F.
• Maximum allowable cable length: 984 feet.
• Firmly attach the cable; provide slack but secure in a way to pre-
vent external forces from being imparted on the terminal block.
• Wiring should be completed without splices.
• Terminate the cable shield to a grounded surface at the outdoor
unit only.
• Always verify the communication cable is connected to a communications terminal on the Single Zone unit. Never apply line
voltage power to the communication cable connection. If contact is made, the PCBs may be damaged.
• The shield of the communications cable connecting the outdoor unit to the indoor unit should be grounded only to the outdoor unit frame.
• Tie the shield of each cable segment together using a wire nut at each indoor unit. Maintain polarity throughout the communication network.
• Position the outdoor unit communications cables away from the power wiring. Refer to minimum spacing requirements provided in
Table 30.
• Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., be-
tween outdoor unit and indoor unit).
General Communication Cable Specifications
• Never apply line voltage power to the communications cable terminal block. If contact is made, the PCBs may be damaged.
• Always include some allowance in the wiring length when terminating. Provide some slack to facilitate removing the electrical
panels while servicing.
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