Rta-Rtw Chiller Interface; Description; Type Of Communication Card: Isolated Comm3; Wiring Notes - Trane Tracer Summit Hardware And Software Installation Manual

BMTW-SVN01F-EN

RTA-RTW Chiller Interface

Description

RTA-RTW UCMs allow Tracer Summit to monitor, control, and configure
air-cooled chillers and water-cooled chillers. The RTA-RTW interface pro-
vides a communication link between the BCU and each RTA-RTW chiller.
For specific information about the number of RTA-RTWs allowed per
BCU and per communication link, refer to Table 7 on page 46.

Type of Communication Card: Isolated Comm3

Refer to "Isolated Comm3 Card" on page 49.

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:
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 RTA-
RTW UCM at TB2-1 and TB2-2 on the CSR board. For connection
points on the UCM, see Figure 46 on page 98.
RTA-RTW Chiller Interface
97