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VAV-SVX07A-EN 15
VAV Start Up/Check Out Procedure
Communication Wiring
WARNING
Electrocution and Fire Hazards with Improperly Installed and Grounded
Field Wiring!
Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid
these hazards, you MUST follow requirements for field wiring installation and grounding as
described in NEC and your local/state electrical codes. All field wiring MUST be performed by
qualified personnel. Failure to follow these requirements could result in death or serious injury.
Communication Link Wiring Requirements
• Use 18 AWG Trane purple-shielded communication wire for BACnet installations.
• Link limit of 4,000 ft and 60 devices maximum (without a repeater).
• Use a Trane BACnet termination on each end of the link.
• Use daisy chain topology. See Figure 2, p. 15.
• Maintain polarity.
Recommended Wiring Practices
To ensure proper network communication, follow these recommended wiring and planning
guidelines when installing communication wire:
• All wiring must comply with the National Electrical Code (NEC) and local codes.
• Make sure that 24 VAC power supplies are consistent in how they are grounded. Avoid sharing
24 VAC between controllers.
• Avoid over tightening cable ties and other forms of cable wraps. This can damage the wires
inside the cable.
• Do not run communication cable alongside or in the same conduit as 24 VAC power. This
includes the conductors running from TRIAC-type inputs.
• In open plenums, avoid running wire near lighting ballasts, especially those using 277 VAC.
• Use same communication wire type, without terminators, for the zone sensor communication
stubs from the Tracer UC400 controller IMC terminals to the zone sensor communication
module.
Note: For more information see wiring guide BAS-SVN03*-EN, Unit Controller Wiring for Tracer
SC™ System Controller.
Figure 2. BACnet link wiring in daisy chain configuration with Trane BACnet terminators and zone senor
communication stubs