Overriding Occupancy - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Sequence of Operations
Occupancy Determined by Manual Command
Some communicating devices may request an occupancy mode based on the
information communicated in the communicated occupancy override network variable.
Trane
but the controller accepts this network variable.
Note: The receipt of communicated occupancy override with a value other than bypass
Occupancy Determined by Schedule
Building automation systems typically communicate an occupancy mode request using
the occupancy schedule input. The controller accepts communicated occupancy
schedule in the communicated occupancy schedule network variable input.
Occupancy Determined by Sensor
Some occupancy sensors may have the capability to communicate an occupancy mode
to the controller. In such devices, the communicated occupancy sensor variable is used
to communicate the occupancy mode to the controller. Trane systems and zone sensors
do not currently send this variable. The hardwired occupancy input of the controller is
handled as if it is a communicated occupancy sensor input. When both a hardwired input
and a communicated input are available, the communicated input is used.

Overriding Occupancy

Some Trane zone sensors include timed override buttons labeled ON and CANCEL. The
controller always recognizes the timed override ON button. Use the timed override ON
button to place the controller in override (occupied bypass mode). Use the timed override
CANCEL button to cancel the override request.
Table 27
Table 26.Bypass timer action
Zone sensor
buttons
None
ON
CANCEL
Both ON and
CANCEL
a. When an update of the communicated occupancy mode override indicates bypass,
b. If both the ON and CANCEL buttons are pressed simultaneously, it is interpreted as
38
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systems and zone sensors do not communicate this information to the controller,
causes the occupied bypass timer to be set to zero.
shows the result of using the ON button in each of the four occupancy modes.
Bypass timer action
Timer counts down to zero and stops
Set bypass timer to the configured occupied bypass
a
time
Set bypass timer to zero
Set bypass timer to the configured occupied bypass
b a
time
the bypass timer is set to the configured occupied bypass time.
ON.
Table 26 shows bypass timer actions and
CNT-SVX17G-EN