Scroll Chillers: U.S.-built CGA/CGW and IntelliPak (CGAF) Interfaces
BMTW-SVN01F-EN 99
Scroll Chillers: U.S.-built CGA/CGW
and IntelliPak (CGAF) Interfaces
Description
Interfaces for the scroll chillers CGA/CGW and IntelliPak (CGAF) pro-
vide a communication link between each scroll chiller and the BCU. For
specific information about the number of scroll chillers allowed per BCU
and per communication link, refer to Table 7 on page 46.
For information on scroll chillers manufactured in Europe, see “Trane
Europe Chiller Interface” on page 115.
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 wire specified in this man-
ual. 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. For the CGA/CGW, attach the other end of the communication-link
wiring to the UCM at TB2-1 and TB2-2. For the location of the TB2
terminal block on the CGA/CGW, refer to Figure 47 on page 100. For
the CGAF, attach the other end of the communication-link wiring to
the UCM at the comm link + and – terminals. For the location of the
comm link, refer to Figure 48 on page 101. For more detailed informa-
tion on wiring the CGAF, refer to CGAF-IOM-1.
To connect shield:
Connect the shield at the BCU (TB2) to provide a drain for RFI/EMI, and
then splice it with other UCM shields at the UCM end. Tape the shield at
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