Tracer ® Uc400-B Controller; Communication Wire; Specifications; General Wiring Guidelines - Trane BCHE Installation, Operation And Maintenance Manual

3. Set thermostat away from working area.
4. Align thermostat base with junction box mounting holes
and feed the control wires through hole.
5. Use supplied screws to mount thermostat base to
junction box.
6. Wire nut the thermostat wires to your system wires.
7. Gently tug wire to be sure of proper connection. Double
check that each wire is connected to the proper
terminal.
8. Snap thermostat to base that is mounted on the wall.
Refasten with screw.
9. Turn on power to the system at the main service panel.
10. Test thermostat operation as described in "Testing the
Thermostat".
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Tracer UC400-B Controller
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The Tracer UC400-B single-zone VAV controller can be
used in a stand-alone application or as part of a Tracer
control system.
In the stand-alone configuration, Tracer
receives operation commands from the zone sensor and/or
the auto changeover sensor (on auto changeover units).
The entering water temperature is read from the auto
changeover sensor and determines if the unit is capable of
cooling or heating. The zone sensor module is capable of
transmitting the following information to the controller:
• Timed override on/cancel request
• Zone setpoint
• Current zone temperature
• Fan mode selection (off-auto-high-med-low)
For optimal system performance, units can operate as part
®
of a Tracer SC building automation system. The controller
is linked directly to the Tracer
communication wire, requiring no additional interface
device (i.e., a command unit). The Tracer
can monitor or override Tracer
This includes such points as temperature and output
positions.
Note: For more detailed information, refer to BAS-SVX20*-
EN Tracer® UC400-B Programmable Controller
Installation, Operation, and Maintenance manual.
BCX-SVX002A-EN
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®
UC400-B
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SC via a twisted pair
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control system
®
UC400-B control points.
Communication Wire Specifications
All wiring must comply with the National Electrical Code
(NEC™) and local electrical codes.
Field-supplied BACnet MS/TP link wiring must be installed
in compliance with NEC and local codes. The wire must be
low-capacitance, 18-gauge, stranded, tinned-copper,
shielded, twisted-pair.
Note: For more details, refer to Wiring Guide: Unit
Controller Wiring for the Tracer
Controller (BAS-SVN03*EN, or the most recent
revision).

General Wiring Guidelines

Figure 56. Connecting wires to terminal
To connect wires to the UC400-B controller or the
expansion modules:
1. Strip the wires to expose 0.28 inch (7 mm) of bare wire.
2. Insert the wire into a terminal connector.
3. Tighten the terminal screw to 0.5 to 0.6 N-m (71 to
85 ozf-in. or 4.4 to 5.3 lbf-in.).
4. Tug on the wires after tightening the screws to ensure
all wires are secure as shown on the right.

Setting the Address

The rotary address dials on the UC400-B controller serve
one or two purposes depending upon the network: they are
always used for the MAC Address, which is sometimes all
or part of the BACnet® Device ID as shown in the following
figure.
Use a 1/8 inch (3.2 mm) flathead screwdriver to set rotary
address dials. Dials rotate in either direction.
Installation - Controls
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SC System
65