Space Temperature Control Mode - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Sequence of Operations
Table 28.Effective occupancy arbitration for Trane Comm5 devices (continued)
Communicated
Communicated occupancy
occupancy mode schedule
a
mode override (heartbeat)
b
Not present Occupied
Unoccupied
Standby
Not present
a. The communicated occupancy override enumerations of unoccupied and standby can be bypassed.
b. The bypass timer is set to the value in the configured occupied bypass time each time one of the following occurs:
• Receive communicated occupancy mode override of bypass
• Receive timed override On request from the local zone sensor module
(zone sensor ON button is pressed for one second then released)
After the bypass timer is set to the configured occupied bypass time, it counts down to zero.
The bypass timer is cleared to zero each time one of the following occurs:
• Receive communicated occupancy mode override of: occupied, unoccupied, standby, or not present
• Receive timed override cancel request from the local zone sensor module
(zone sensor cancel button is pressed for one second then released)
To disable the bypass timer, set the configured occupied bypass time to zero. This effectively disables the zone sensor module
timed override On function, and the communicated occupancy mode override bypass request.
c. An upper case X means "do not care".
Note: The shaded area of the table is where most jobs operate.

Space Temperature Control Mode

Space temperature control (STC) is one of three supported control algorithms. Space
temperature control requires a valid space temperature. If there is no valid space
temperature (communicated or local), the space temperature control algorithm does not
run; the unit either shuts down or goes to construction mode.
Tracer
temperature at the active space cooling setpoint or the active space heating setpoint. The
space temperature control algorithm runs once every 10 seconds.
40
Communicated
occupancy
mode sensor
(heartbeat)
Occupied
Unoccupied
Not present
c
X
c
X
Occupied
Unoccupied
Not present
®
VV550/VV551 controllers use the active space temperature to maintain the space
Occupancy
binary input Bypass timer
c c
X X
c
X Zero
Not zero
c
Occupied X
Unoccupied Zero
Not zero
c
Not present X
c
X Zero
Not zero
c
X Zero
Not zero
c c
X X
c
X Zero
Not zero
c
Occupied X
Unoccupied Zero
Not zero
c
Not present X
Reported
effective
occupancy
mode
Occupied
Standby
Bypass
Occupied
Standby
Bypass
Occupied
Unoccupied
Bypass
Standby
Bypass
Occupied
Unoccupied
Bypass
Occupied
Unoccupied
Bypass
Occupied
CNT-SVX17G-EN