Trane R Series, Installation Operation & Maintenance

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76 RLC-SVX07A-EN
Installation - Electrical
multiple-machine controller or a remote display panel. A shielded, twisted-pair
connection establishes the bidirectional communications link between the
unit control panel and the Tracer, multiple-machine controller or remote
display panel.
NOTE: The shielded, twisted-pair conductors must run in a separate
conduit.
Field wiring for the communication link must meet the following require-
ments:
1. All wiring must be in accordance with the NEC and local codes.
2. Communication link wiring must be shielded, twisted-pair wiring (Belden
8760, or equivalent). Refer to the Section
“Refrigerant Charging” for wire
size.
3. The maximum total wire length for each communication link is 5,000 feet.
4. The communication link cannot pass between buildings.
5. All UCM's on the communication link can be connected in a “daisy chain”
configuration.
Communication Link Connection Procedure
1. Refer to the Tracer installation literature to determine proper communica-
tion link termination connections at the Tracer unit.
2. Refer to the "Remote Clear Language Display Installation Procedure on
Page" 77 , to determine termination points at a remote Clear Language
Display.
3. Connect the shield of the communication link wiring to the designated
shield terminal at the Tracer unit.
4. Connect leads 561 and 562 from the proper terminals of 1U2 TB2-1 and
TB2-2 on the UCM to the Tracer. There is no polarity requirement for this
connection.
5. At the UCM, the shield should be cut and taped to prevent any contact
between the shield and ground.
NOTE: On multiple-unit installations, splice the shielding of the two twisted-
pairs that come into each UCM in the “daisy chain” system. Tape the spliced
connections to prevent any contact between the shield and ground. At the
last Clear Language Display in the chain, the shield should be cut and taped
off.
6. To get the chiller to communicate with a Tracer on a multiple-unit control-
ler, the ICS address under the “Service Settings” menu must be set and
the optional 1U2 module must be installed. The Tracer will look for chiller
addresses 55, 56, 57, 58, 59 or 60. Each chiller must have a unique
address.
LonTalk Communication Interface (LCI-C)
The Tracer LCI-C interface acts as a translator between Trane's IPC (Inter-
Processor Communication) and Echelon's LonTalk® communications protocol
(ANSI/EIA/CEA 709.1). This allows the chiller to communicate with building
automation systems which also communicate using the LonTalk® protocol.
The LonTalk® communications protocol also allows for peer to peer commu-