Trane Tracer AH540 User Manual

Occupancy modes
CNT-SVX05B-EN 43
The controller can be placed into the occupied standby mode when a com-
municated occupancy request is combined with the local (hard-wired)
occupancy binary input signal. When the communicated occupancy
request is unoccupied, the occupancy binary input (if present) does not
affect the controller occupancy. When the communicated occupancy
request is occupied, the controller uses the local occupancy binary input
to switch between the occupied and occupied standby modes.
During occupied standby mode, the controller economizer damper posi-
tion goes to the economizer standby minimum position. The economizer
standby minimum position can be changed using the Rover service tool.
When no occupancy request is communicated, the occupancy binary input
switches the controller operating mode between occupied and unoccupied.
When no communicated occupancy request exists, the unit cannot switch
to occupied standby mode.
Occupied bypass mode
If configured for either space temperature control or discharge air tem-
perature control, the controller uses occupied bypass mode for timed over-
ride conditions. For example, if the controller is in unoccupied mode and
someone presses the
ON button on the zone sensor, the controller is placed
in occupied bypass mode for 120 minutes (adjustable) or until someone
presses the
CANCEL button on the zone sensor. The controller can be
placed in occupied bypass mode by either communicating an occupancy
request of Bypass to the controller or by using the timed override
ON but-
ton on the Trane zone sensor.
When the controller is in unoccupied mode, you can press the
ON button
on the zone sensor to place the controller into occupied bypass mode for
the duration of the bypass time (typically 120 minutes).
If the controller is in the occupied standby mode, you can press the
ON
button on the zone sensor to place the controller into occupied bypass
mode for the duration of the configured bypass time. Typically, the con-
troller is in occupied standby mode rather than occupied mode because of
the local binary occupancy input.
Sources of occupancy mode control
There are four ways to control the occupancy mode (see Table 16 on
page 39):
• Communicated request (usually provided by the building automation
system or peer device)
• Pressing the zone sensor timed override ON button (or CANCEL button)
• Occupancy binary input (see “Occupancy binary input” for more infor-
mation)
• Default operation of the controller (occupied mode)
A communicated request from a building automation system or another
peer controller can change the controller occupancy. However, if commu-
nication is lost, the controller reverts to the default operating mode (occu-

Trane Tracer AH540 Specifications

General

Brand	Trane
Model	Tracer AH540
Category	Controller
Language	English