Space Setpoint Operation; Occupancy Mode Sources - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Sequence of Operations

Space Setpoint Operation

Space setpoints provide temperature boundaries for each of the occupancy modes of the
Tracer
setpoints available:
•
•
•
Table 25
the locally stored default unoccupied heating and cooling setpoints. These local
setpoints are configured during factory download and unit verification. Use the Rover
service tool or the Tracer Summit
Table 25.Space setpoint operation
Method
Zone sensor (with an
adjustable hardwired
setpoint, SET)
Communicated Source
Stored default space
setpoints

Occupancy Mode Sources

There are various ways to control the controller occupancy mode. The first two bullet
points are the more common and separately addressed below:
•
•
•
•
•
Communicated Request
A communicated request from a building automation system or another peer controller
can change the controller occupancy mode. However, if communication is lost, the
36
® VV550/VV551 controllers. There are three sets of possible heating and cooling
Occupied (also used by occupied bypass);
Occupied standby;
Unoccupied.
shows the space setpoint operation. In unoccupied mode, the controller uses
When used
A hardwired, adjustable setpoint is connected to the controller. Local setpoints are enabled in
the unit configuration. No communicated setpoint is present.
A communicated setpoint to the unit controller comes from a building automation system or
a peer controller. If both a hardwired setpoint and a communicated setpoint are available, the
controller uses the communicated value. The configuration feature for enabling and disabling
the local setpoint does not affect the setpoint handling when a communicated setpoint is used.
The communicated setpoint always takes priority over the hardwired setpoint, even when the
local setpoint is enabled.
The controller uses the locally stored default heating and cooling setpoints when neither a local
hardwired setpoint nor communicated setpoint is present. The controller uses stored default
setpoints when only a local setpoint exists, but the local setpoint is disabled in the configuration
of the controller. The controller always uses the stored default (unoccupied) setpoints in
unoccupied mode.
Communicated request (Comm5 network variable inputs);
– Communicated occupancy override (occupied, unoccupied, standby, bypass);
– Communicated occupancy schedule (occupied, unoccupied, standby);
– Communicated occupancy sensor (occupied, unoccupied).
Occupancy binary input (occupied, unoccupied);
Zone sensor timed override ON button;
Zone sensor timed override CANCEL button;
Default operation of the controller (occupied mode).
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BAS to modify these default unoccupied setpoints.
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CNT-SVX17G-EN