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ELECTRICAL SYSTEM INSTALLATION
Communications Cables
General Communication Cable Specifications
• Use a two-core, shielded, stranded cable between the water source
unit and the indoor units.
• 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.
• Use copper-bearing ring or spade terminals to terminate communi-
cation cables.
• Firmly attach the cable; provide slack but secure in a way to pre-
vent external forces from being imparted on the terminal block.
Figure 63: Water Source Unit Communications Labeling Schematic.
Recommended—Two-Core Shielded, Stranded Cable in a Daisy Chain
Configuration
Note:
• Ring and spade terminals used to connect communications cables MUST be copper bearing. Do NOT use terminals that are galva-
nized or nickle plate over steel.
• Always verify the communication cable is connected to a communications terminal on the water source 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 water source unit to the indoor units should be grounded only to the water
source unit frame. Tie the shield of each cable segment together using a wire nut at each indoor unit.
• Never ground the shield of the communications cable to the indoor unit frame or other grounded entities of the building.
• Position the water source unit communications cables away from the power wiring. Refer to minimum spacing requirements provided
in Table 28.
• Never use a common multiple-core communications cable. Each communications bus shall be provided a separate cable (i.e., be-
tween water source units and indoor units, water source 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.
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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.
• Communications cable connecting the water source unit an indoor
unit(s) should be installed and terminated in a daisy chain (BUS)
configuration starting at the water source unit.
• Terminate the cable shield to a grounded surface at the water
source unit only. Cable shields between connected devices shall be
tied together and continuous from the water source unit to the last
device connected.
Improperly Terminated Communications Cable—Multiple Core Cable in
a Starburst Configuration
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