Trane VAV VV550 LonTalk, Руководство по установке и эксплуатации

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VAV-SVP01A-EN 19
VAV Start Up/Check Out Procedure
Communication Wiring
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
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 the National Electrical Codes (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
• Use 22 AWG Level 4 unshielded communication wire for most Comm5 installations.
• Limit Comm5 links to 4,500 ft and 60 devices maximum (without a repeater).
• Use the following termination resistors on all links:
• 105
Ω
at each end for Level 4 wire
• Use daisy chain topology.
• Limit zone sensor communication stubs to 8 per link, 50 ft each maximum.
• Use one repeater for an additional 4,500 ft, 60 devices, and 8 communication stubs.
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.
• Although Comm5 does not require polarity sensitivity, Trane recommends keeping polarity
consistent throughout the site.
• Make sure that 24VAC power supplies are consistent in how they are grounded. Avoid sharing
24VAC between Comm5 controllers.
• Avoid over tightening cable ties and other forms of cable wraps. This can damage the wires
inside the cable.
• Do not run Comm5 cable alongside or in the same conduit as 24VAC 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 a daisy chain configuration.
• Use termination resistors as described in "Termination resistance placement for Comm5 links"
• Insulate termination-resistor leads.
• Use only one type of communication wire; do not mix different types