Chapter 5 UCM Wiring and Addressing
104 BMTW-SVN01F-EN
Terminal Unit Controller (TUC)
Interface
Description
Terminal unit controllers (TUCs) allow Tracer Summit to monitor and
control terminal units such as fan coils, water-source heat pumps, unit
ventilators, and blower coils.
You can connect TUCs to any Comm4 UCM communication link in the
BCU on TB2. The link provides a serial communication interface between
the BCU and each TUC in the system. For specific information about the
number of TUCs allowed per BCU and per communication link, refer to
Table 7 on page 46. Make certain that the polarity is observed throughout
the link. For polarity information, refer to Figure 16 on page 47.
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 communications-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:
1. 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.
2. Attach the other end of the communication-link wiring to the TUC at
the ICS terminal. Refer to the TUC installation literature
(EMTX-IOP-1) for connection points.
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