Trane Tracer AH540 Setup And Operation page 55

Table 18: Effective occupancy arbitration for Tracer AH540/541 with operator display
Commun-
Manual
icated
override
1
schedule
(nviOccMan
(nviOcc
Cmd)
Schedule)
Occupied —
Unoccupied —
Bypass Occupied
Unoccupied
Standby
Null
1 This value is the last enumeration received. It can come from either the nviOccManCmd network variable or the operator dis-
play schedule override.
2 Null = any other value.
3 The variable nviOccSensor is used with the SCC profile only. Refer to the Null rows in this column for the DAC profile.
4 This value represents whether or not the bypass timer is at zero or not. When a bypass request is made, the timer is set to the
value specified in the Occupied Bypass Timer field, and it begins to count down. While it is counting down, the value is not
zero. When the count down is complete, the value is zero.
CNT-SVX05B-EN
Occupancy—schedule
Building automation systems normally communicate an occupancy
request to the Tracer AH540/541 controller using a network variable
input (nviOccSchedule).
Occupancy—sensor
Some occupancy sensors may be equipped with the ability to communi-
cate an occupancy mode to the controller. In such devices, network vari-
able input (nviOccSensor) is used to communicate occupancy to the
controller. Trane systems and zone sensors do not currently send this
variable. The hard-wired occupancy input of this controller is handled as
if it is a communicated occupancy sensor input. When both a hard-wired
input and a communicated input exist, the communicated input is used.
Occupancy
Local sensor
schedule (nviOcc
Sensor
—
—
—
—
—
2
Occupied
Unoccupied
Null
Local
occupancy
binary input
)
3
— —
— —
— —
— —
— —
— —
— —
Occupied —
Unoccupied —
Null Occupied
Unoccupied
Not present
Occupancy modes
Result
Bypass
(nvoEffect
4
timer
Occup)
— Occupied
zero Unoccupied
not zero Bypass
— Occupied
zero Unoccupied
not zero Bypass
zero Standby
not zero Bypass
— Occupied
zero Unoccupied
not zero Bypass
— Occupied
zero Unoccupied
not zero Bypass
— Occupied
zero Unoccupied
not zero Bypass
— Occupied
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