Electrical Connections
Liebert
®
SRC
™
User Manual 74
6.2 Communication-cable Specifications
• Use a 4 conductor, shielded, stranded cable between the outdoor unit and the indoor unit.
• Minimum 18-gauge shielded CVVS or CPEVS cable.
• Insulation materials as required by local code.
• Rated for continuous exposure of temperatures up to 140°F.
• Maximum allowable cable length: 984 ft.
• Firmly attach the cable. Provide slack but secure in a way to prevent external forces from being
imparted on the terminal block.
• Terminate the cable shield to a grounded surface at the outdoor unit only.
6.3 Communication Cables between the Unit and Controller
• Field-supplied, 18 gauge, stranded 4-conductor communication cable (shielded).
• All insulation material as recommended by local code.
• Starting at the outdoor unit, terminate the cable on terminals Internet A and Internet B. Route the cable
as needed between each device.
NOTE
• Always verify that the communication cable is connected to a
communications terminal on the unit. Never apply line-voltage power to the
communication-cable connection. If contact is made, PCBs may be
damaged.
• The shield of the communication 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 through the communication network.
• Never use a common multiple-core communication cable. Each
communications bus must be provided a separate cable (that is, between
the outdoor unit and indoor unit).
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