Trane RTWB Helical-Rotary Installation Operation & Maintenance page 26

26
Installation Electrical
General
Field wiring for the communication
link must meet the following
requirements:
1. All wiring must be in accordance
with local codes.
2. Communication link wiring must
be shielded, twisted-pair wiring.
3. The maximum total length for
each communication link is 1,500
meters.
4. The communication link cannot
pass between buildings.
5. All UCM 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
communication-link termination
connections at the Tracer module.
2. Connect the shield of the
communication-link wiring to the
designated shield terminal at the
Tracer module.
3. Connect leads to terminals 1 and
2 of TB2 of the module A9 of the
UCM to the Tracer. There is no
polarity requirement for the
connection.
4. 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 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.
5. To get the chiller to communicate
with a Tracer on a multiple-unit
controller, the ICS address under
the "service settings" menu must
be set and the optional A9
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.
RTWB-SVN01B-E4