Tracer® Uc400-B Controller - Trane UniTrane Installation, Operation And Maintenance Manual

Startup
mode, when the controller always uses the stored default
unoccupied setpoints. After the controller completes all
setpoint calculations, based on the requested setpoint, the
occupancy mode, the heating and cooling mode, and
other factors, the calculated setpoint is validated against
the following setpoint limits:
• Heating setpoint high limit
• Heating setpoint low limit
• Cooling setpoint high limit
• Cooling setpoint low limit
These setpoint limits only apply to the occupied and
occupied standby heating and cooling setpoints. These
setpoint limits do not apply to the unoccupied heating and
cooling setpoints stored in the controller's configuration.
When the controller is in unoccupied mode, it always uses
the stored unoccupied heating and cooling setpoints.The
unit can also be configured to enable or disable the local
(hard-wired) setpoint. This parameter provides additional
flexibility to allow you to apply communicated, hard-
wired, or default setpoints without making physical
changes to the unit.
Similar to hard-wired setpoints, the effective setpoint
value for a communicated setpoint is determined based
on the stored default setpoints (which determines the
occupied and occupied standby temperature deadbands)
and the controller's occupancy mode.
Fan Switch
The zone sensor fan switch provides the controller with an
occupied (and occupied standby) fan request signal (Off,
Low, Medium, High, Auto). If the fan control request is
communicated to the controller, the controller ignores the
hard-wired fan switch input and uses the communicated
value. The zone sensor fan switch input can be enabled or
disabled through configuration using the Rover service
tool. If the zone sensor switch is disabled, the controller
resorts to its stored configuration default fan speeds for
heating and cooling, unless the controller receives a
communicated fan input.
When the fan switch is in the off position, the controller
does not control any unit capacity. The unit remains
powered and all outputs drive to the closed position. Upon
a loss of signal on the fan speed input, the controller
reports a diagnostic and reverts to using the default fan
speed.
On/Cancel Buttons
Momentarily pressing the on button during unoccupied
mode places the controller in occupied bypass mode for
120 minutes. You can adjust the number of minutes in the
unit controller configuration using Rover service tool. The
controller remains in occupied bypass mode until the
override time expires or until you press the Cancel button.
3. Rotate the setpoint dial on the zone sensor module to
114
Communication Jack
Use the RJ-11 communication as the connection point
from Rover service tool to the communication link—when
the communication jack is wired to the communication
link at the controller. By accessing the communication jack
via Rover, you can access any controller on the link.
Communications
The controller communicates via LonTalk protocol.
Typically, a communication link is applied between unit
controllers and a building automation system.
Communication also is possible via Rover, Trane's service
tool. Peer-to-peer communication across controllers is
possible even when a building automation system is not
present. You do not need to observe polarity for LonTalk
communication links.
The controller provides six 0.25-inch quick-connect
terminals for the LonTalk communication link connections,
as follows:
• Two terminals for communication to the board
• Two terminals for communication from the board to
the next unit (daisy chain)
• Two terminals for a connection from the zone sensor
back to the controller
Table 58. Zone sensor wiring connections
TB1
1 Space temperature / timed override detection
2
3
4
5
6
Tracer® UC400-B Controller
Tracer® UC400-B controller delivers single zone VAV
control in a stand-alone operation or as part of a building
automation system using BACnet
UC400-B Stand-Alone Operation
The factory pre-programs the Tracer® UC400-B with
default values to control the temperature and unit airflow.
Use Tracer® SC building automation system or Tracer®
TU™ software to change the default values. For more
information, refer to:
• BAS-SVX48*-EN Tracer® UC400/UC400-B
Programmable Controllers for Blower Coil, Fan Coil,
and Unit Ventilator Installation, Operation, and
Maintenance guide
Follow the procedure below to operate the Tracer®
UC400-B in a stand-alone operation:
1. Turn power on at the disconnect switch option.
2. Position the fan mode switch to either high, medium,
low, or the auto position.
55°F for cooling or 85°F for heating.
Description
Common
Setpoint
Fan mode
Communications
Communications
®
communications.
UNT-SVX07J-EN