Determining The Occupancy Mode - Trane Tracer VV550 Installation, Operation And Maintenance Manual

controller reverts to the default operating mode (occupied) after 15 minutes (the
configured receive heartbeat time), if no local hardwired occupancy mode signal exists.
A communicated request can be provided to control the occupancy mode of the
controller. Typically, the occupancy mode of the controller is determined by using time-
of-day scheduling in the building automation system. The result of the time-of-day
schedule can then be communicated to the unit controller (communicated occupancy
schedule). If the communicated occupancy schedule receives heartbeat times out, the
controller reverts back to occupied.
To view the present values chart for Tracer Summit
page
automation system (BAS) applications of this controller, see the Tracer Summit product
literature. For more information on the setup of another building automation system,
refer to product-specific literature from its manufacturer.
Occupancy Binary Input
The binary input can be configured as an occupancy input. The controller uses the
occupancy binary input and the presence of a communicated occupancy schedule to
determine the occupancy mode of the unit.
If a controller does not receive a communicated occupancy schedule, usually from a
building automation system (stand-alone controller), the occupancy binary input
determines the occupancy mode of the unit based on the hardwired signal. Typically, the
signal is hardwired to a binary switch or to a time clock.
If a controller receives a communicated occupancy schedule from a building automation
system, the hardwired occupancy binary input is used with a communicated occupancy
schedule to determine the occupancy mode of the controller: either occupied mode or
occupied standby mode.
If neither a hardwired binary input nor a communicated schedule is used to select the
occupancy mode, the controller defaults to occupied mode.

Determining the Occupancy Mode

The occupancy mode of the controller is determined by evaluating a combination of
three communicating inputs, the hardwired occupancy input, and the timed override ON
and CANCEL buttons on the Trane zone sensor. Three communicating inputs affect the
controller occupancy mode:
•
•
•
These three network variables provide maximum flexibility, but the number of inputs
used varies with the application and the features available in the building automation
system.
CNT-SVX17G-EN
92. For complete information about the setup for Tracer Summit building
Occupancy determined by manual command;
Occupancy determined by schedule;
Occupancy determined by sensor.
Sequence of Operations
™
BAS SCC, refer to Table 61 on
37