Trane LO - Manual (Page 77)

UNT-IOM-6 77
Tracer ® ZN.520
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 commu-
nicated, 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.
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 com-
municated 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 configu-
ration 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.
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 access-
ing the communication jack via Rover™, you gain access to any
controller on the link.
Fan Switch
On/Cancel Buttons