LG LA090HVP Installation Manual page 48

ELECTRICAL WIRING
Power Wiring Specifications and Best Practices
Power Best Practices
• 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. There is risk of
fire, electric shock, and physical injury or death.
• 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.
General Communication Cable Specifications
• 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.
• 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 19
on page 46.
• Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., between
outdoor unit and indoor unit).
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.
*
• LonWorks™ is a registered trademark of Echelon Corporation.
• BACnet™ is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE).
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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.
• 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.