Trane Tracer VV550 User Manual

40 CNT-SVX17G-EN
Sequence of Operations
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
®
VV550/VV551 controllers use the active space temperature to maintain the space
temperature at the active space cooling setpoint or the active space heating setpoint. The
space temperature control algorithm runs once every 10 seconds.
Not present
b
Occupied Occupied X
c
X
c
Occupied
Unoccupied X
c
Zero Standby
Not zero
Bypass
Not present Occupied X
c
Occupied
Unoccupied Zero Standby
Not zero Bypass
Not present X
c
Occupied
Unoccupied X
c
X
c
Zero Unoccupied
Not zero Bypass
Standby X
c
X
c
Zero Standby
Not zero Bypass
Not present Occupied X
c
X
c
Occupied
Unoccupied X
c
Zero Unoccupied
Not zero Bypass
Not present Occupied X
c
Occupied
Unoccupied Zero Unoccupied
Not zero Bypass
Not present X
c
Occupied
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:
• Rec
eive communicated occupancy mode override of bypass
• Rec
eive 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.
T
he bypass timer is cleared to zero each time one of the following occurs:
• Rec
eive communicated occupancy mode override of: occupied, unoccupied, standby, or not present
• Receive t
imed 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.
Table 28.Effective occupancy arbitration for Trane Comm5 devices (continued)
Communicated
occupancy
mode override
a
Communicated
occupancy
mode schedule
(heartbeat)
Communicated
occupancy
mode sensor
(heartbeat)
Occupancy
binary input
Bypass timer
Reported
effective
occupancy
mode

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English