VAV Wireless Receiver Interface
BMTW-SVN01F-EN 133
VAV Wireless Receiver Interface
Description
The variable air volume (VAV) wireless receiver allows a Tracer Summit
system to monitor wireless thermostats. You can connect the wireless
receiver to any Comm4 UCM communication link on TB2. The link pro-
vides a serial communication interface between the BCU and each wire-
less receiver in the system. For specific information about the number of
wireless receivers allowed per BCU and per communication link, refer to
Table 7 on page 46.
Type of Communication Card: Comm4
Refer to “Comm4 Card” on page 51.
Wiring Notes
To establish wiring connections between the UCM and the BCU, Trane
requires that you use the communication-link wiring specified in this
manual. For wire selection specifications, see “UCM Communication-
Wire Characteristics” on page 55.
Use fiber-optic modems for building-to-building communication. If fiber
optics are not used, building-to-building communication wiring requires a
Transtector transient protector at each building. You can purchase Tran-
stector protectors through Trane. Contact your local Trane sales office for
details.
In a daisy chain configuration, use one pair of wires that start at the BCU
and go to all UCMs in a continuous loop. A branch configuration is possi-
ble if you need to tap into a daisy chain. Limit the total aggregate length
of the wiring for each communication link to 5,000 ft (1,524 m).
To connect communication wiring:
Attach one end of the communication-link wiring to TB2 on the BCU. For
the location of TB2, refer to Figure 16 on page 47. The wireless receiver
ships from the factory with wire terminations completed inside the
receiver. The wire protruding through conduit on the back side of the unit
is ready to be spliced. To identify which color to use when splicing com-
munication-link wiring, refer to Figure 61 on page 134.
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