Sequence of operation
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Occupancy sources
The controller's occupancy can be controlled in four ways:
■ Communicated request (usually provided by the building automation
system or peer device)
■ By pressing the zone sensor's timed override On button
■ Occupancy binary input
■ Default operation of the controller (occupied mode)
A communicated request from a building automation system or another peer
controller can change the controller's occupancy. However, if communication is
lost, the controller reverts to the default operating mode (occupied) after 15
minutes, if no local hardwired occupancy signal exists.
A communicated request can be provided to control the occupancy of the
controller. Typically, the occupancy of the controller is determined by using
time-of-day scheduling of the building automation system. The result of the
time-of-day schedule can then be communicated to the zone controller.
For complete information about the setup for Tracer Summit applications of
this controller, see the Tracer Summit product literature. For more information
on the setup of another building automation system, refer to the product-
specific literature from that manufacturer.
Determining the occupancy mode
The occupancy of the controller is determined by evaluating the combination of
three potential communicating inputs, as well as the hardwired occupancy
input. Three different communicating inputs affect the controller's occupancy
mode:
■ Occupancy—manual command
■ Occupancy—schedule
■ Occupancy—sensor
These inputs provide maximum flexibility, but the number of inputs you decide
to use varies with the application and the features available in your building
automation system. Table 32 on page 50 describes how these inputs interact to
derive the controllers occupancy mode.
Occupancy—manual command
Some communicating devices may request occupancy based on the
information communicated in the network variable known as nvoOccManCmd.
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