CNT-SVX05A-EN
19
Analog inputs
When a duct static pressure is established, the controller generates a
Duct
Static Pressure
diagnostic if the signal is no longer valid, and shuts down the
unit. When the sensor returns to a valid input, the controller automatically
clears the diagnostic and allows the unit to resume operation.
The Tracer
™
AH.540 controller, when configured for variable air volume control,
cannot operate without a valid duct static pressure input. When the sensor
returns to a valid input, the controller resumes unit operation. The controller is
not required to have a duct static pressure input for constant volume space
temperature or constant volume discharge air temperature control.
On/cancel buttons
Momentarily pressing the On button during unoccupied mode places the
controller in occupied bypass mode for 120 minutes. You can adjust the number
of minutes the Tracer AH.540 is placed in the occupied bypass mode using
Rover
™
service tool. The controller remains in occupied bypass mode until the
override time expires or until you press the Cancel button.
If Tracer Summit
™
sends an unoccupied mode command to the controller and
someone presses the On button on the zone sensor, the controller goes to
occupied bypass and communicates back to Tracer that its effective occupancy
mode is occupied bypass.
If the controller is in the unoccupied mode, regardless of the source (Tracer
Summit or hardwired occupancy binary input), pressing the On button causes
the controller to go into the occupied bypass mode for the duration of the
configured occupied bypass time.
