Trane Tracer ZN.520

CNT-SVX04A-EN
Sequence of operation
50
Trane systems and zone sensors do not communicate this information to the
controller, but the Tracer ZN.520 zone controller accepts this network variable
as communicated input nviOccManCmd.
Occupancy—schedule
Building automation systems normally communicate an occupancy request
using the occupancy—schedule input. The Tracer ZN.520 zone controller
accepts communicated occupancy schedule as a network variable input known
as nviOccSchedule.
Occupancy—sensor
Some occupancy sensors may be equipped with the ability to communicate an
occupancy mode to the controller. In such devices, a network variable input k
known as nviOccSensor is used to communicate occupancy to the controller.
Trane systems and zone sensors do not currently send this variable. The
hardwired occupancy input of this controller is handled as if it is a
communicated occupancy sensor input. When both a hardwired input and a
communicated input exist, the communicated input will be used.
Table 32 Effect of occupancy commands on the controller
Note 1: Occupied bypass is initiated by either a communicated request or a local input. The effective occupancy is occupied bypass.
Note 2: The occupancy sensor can be either a local input or a communicated input. If a valid value for the network input is present, it has precedence over
the local input.
Note 3: If the occupancy sensor communicated input is invalid or not present, and no local input exists, the controller's mode is occupied.
Occupancy—manual
command
Occupancy—schedule Occupancy—sensor
(Note 2)
Controller's effective
occupancy
Occupied Any state Occupied (Note 3) Occupied
Unoccupied Occupied
Unoccupied Any state Any state Unoccupied
Occupied bypass Occupied Any state Occupied
(Note 1) Unoccupied Any state Occupied bypass
Occupied standby Any state Occupied bypass
(Note 1)
Invalid or not present Occupied (Note 3) Occupied
Unoccupied Occupied bypass
(Note 1)
Occupied standby Any state Any state Occupied standby
Invalid or not present Occupied Occupied (Note 3) Occupied
Unoccupied Occupied standby
Unoccupied Any state Unoccupied
Occupied standby Any state Occupied standby
Invalid or not present Occupied (Note 3) Occupied
Unoccupied Unoccupied