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Communication Cable Specifications From Outdoor Unit to DOAS Units
• Communication cable from Main Outdoor Unit to DOAS Units is to be LG supplied or field supplied 18 AWG, 2 (2 conductor), twisted,
stranded, shielded.
Never splice communications cable. Ensure the communication cable shield is properly grounded to the Main
Outdoor Unit chassis only.
with all applicable local and national codes.
• Cable shields between the connected devices must be tied together and continuous from the main outdoor unit to the last component con-
nected and insulated to prevent grounding against the DOAS Unit electrical enclosures.
• Start the communication cable at the main outdoor unit and route to the DOAS units in a daisy chain configuration.
starburst configuration.
• Insulation as required by NEC and local codes.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable communication cable length is 3,281 feet.
WARNING
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage.
Do not connect the ground line to the pipes. There is risk of fire, electric shock, explosion, physical injury or
death.
•
Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building. In adequate
connections will generate heat, cause a fire, and result in physical injury or death.
• Always verify the communication cable is connected to a communications terminal on the outdoor unit(s).
power to the communication cable connection. If contact is made, the PCBs will be damaged.
•
Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., between
outdoor unit(s) and DOAS unit(s), outdoor units and central controller(s)). If communications cables of separate systems are wired using a
common multiple-core cable, it will result in a poor communications signal and unacceptable system operation.
Do not ground the Outdoor Unit to DOAS Units communication cable at any other point. Wiring must comply
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 INFORMATION
Do not install in a
Never apply line voltage
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