Trane CNT-SVX07C-EN User Manual

Page of 84
Timed override control
CNT-SVX07C-EN
37
The fan will run as configured (continuous or cycling) for occupied mode. 
The controller always uses the stored default setpoint values (config-
urable using the Rover service tool), regardless of hard-wired or commu-
nicated setpoint values. In addition, the outdoor air damper uses the 
Economizer Occupied Standby Minimum Position setpoint to reduce the 
ventilation rate.
Occupied bypass mode
The controller is placed in occupied bypass mode when the controller is 
operating in the unoccupied mode and either the timed override 
ON
 but-
ton on the Trane zone sensor is pressed or the controller receives a com-
municated occupied bypass signal from a BAS. In occupied bypass mode, 
the controller maintains the zone temperature based on the occupied 
heating or cooling setpoints. The fan will run as configured (continuous or 
cycling). The outdoor air damper will close when the fan is off. The con-
troller will remain in occupied bypass mode until either the 
CANCEL
 but-
ton is pressed on the Trane zone sensor or the occupied bypass time 
(configurable using the Rover service tool) expires. The temperature set-
points can be local (hard-wired), communicated, or stored default values 
(also configurable using the Rover service tool).
Timed override control 
If the zone sensor has a timed override option (
ON
/
CANCEL
 buttons), push-
ing the 
ON
 button initiates a timed override on request. A timed override 
on request changes the occupancy mode from unoccupied mode to occu-
pied bypass mode. In occupied bypass mode, the controller controls the 
zone temperature based on the occupied heating or cooling setpoints. The 
occupied bypass time, which resides in the Tracer ZN521 and defines the 
duration of the override, is configurable from 0 to 240 minutes (default 
value of 120 minutes). When the occupied bypass time expires, the unit 
transitions from occupied bypass mode to unoccupied mode. Pushing the 
CANCEL
 button cancels the timed override request. A timed override can-
cel request will end the timed override before the occupied bypass time 
has expired and will transition the unit from occupied bypass mode to 
unoccupied mode.
If the controller is in any mode other than unoccupied when the 
ON
 but-
ton is pressed, the controller still starts the occupied bypass timer with-
out changing the mode to occupied bypass. If the controller is placed in 
unoccupied mode before the occupied bypass timer expires, the controller 
will be placed in occupied bypass mode and remain in that mode until 
either the 
CANCEL
 button is pressed on the Trane zone sensor or the occu-
pied bypass time expires.