Trane UniTrane Installation, Operation And Maintenance Instructions page 99

When the hardwired setpoint adjustment is used to determine the setpoints, all unit setpoints are
calculated based on the hardwired setpoint value, the configured setpoints, and the active mode
of the controller. The hardwired setpoint is used with the controller's occupancy mode (occupied,
occupied standby, or unoccupied), the heating or cooling mode, the temperature deadband values,
and the heating and cooling setpoints (high and low limits) to determine the controller's active
setpoint.
When a building automation system or other controller communicates a setpoint to the controller,
the controller ignores the hardwired setpoint input and uses the communicated value. The
exception is the unoccupied 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:
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•
•
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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 (hardwired)
setpoint. This parameter provides additional flexibility to allow you to apply communicated,
hardwired, or default setpoints without making physical changes to the unit.
Similar to hardwired 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 hardwired 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.
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.
UNT-SVX07B-EN
Heating setpoint high limit
Heating setpoint low limit
Cooling setpoint high limit
Cooling setpoint low limit
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