Occupancy modes
CNT-SVX05B-EN 41
Occupancy modes
The occupancy mode can be either communicated to the controller or
hard-wired using the occupancy binary input IN9.
The valid occupancy modes for space temperature control are:
• Occupied
• Unoccupied
• Occupied standby
• Occupied bypass
The valid occupancy modes for discharge air temperature control are:
• Occupied
• Unoccupied
• Occupied bypass
Occupied mode
The occupied mode is the normal operating mode for occupied spaces or
daytime operation. The Tracer AH540/541 controller operates this
sequence according to the configured control mode.
Space temperature control: Occupied mode
If configured for space temperature control, the controller attempts to
maintain the space temperature at the active occupied heating or cooling
space setpoint, based on the measured space temperature, the discharge
air temperature, the active setpoint, and the proportional/integral control
algorithm. Additional information related to controller setpoints can be
found in “Space temperature setpoint arbitration” on page 36.
Discharge air temperature control: Occupied mode
If configured for discharge air temperature control, the controller main-
tains the discharge air temperature at the configured discharge air heat-
ing or cooling setpoint. The default occupied mode of the controller is
cooling. In the occupied mode, the controller communicated application
mode input (nviApplicMode) and heat/cool mode input (nviHeatCool)
determine the controller heating and cooling setpoint. See Table 72 on
page 103 for heating and cooling control modes of operation.
Unoccupied mode
The unoccupied mode is the normal operating mode for unoccupied spaces
or nighttime operation. When the controller is in the unoccupied mode,
the controller attempts to maintain the space temperature between the
configured unoccupied heating and cooling setpoints, based on the mea-
sured space temperature. The Tracer AH540/541 controller operates
according to the configured control mode.
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