58 VAV-SVX07B-EN
Calibration, Operation Modes, and Control
Flow Tracking (FTC)
Two (2) UC400 controllers work together to provide flow tracking control (refer to the illustration
below). The space temperature controller (STC) Discharge Air Flow is communicated to the flow
tracking controller and is reported as Air Flow Setpoint BAS.
Note: This must be set up on the Tracer SC using either a global reference or TGP2 program. for
more details, refer to the Air Systems for Tracer SC Application Guide (BAS-APG007).
The flow tracking controller adds the configured airflow tracking offset (positive or negative) to the
Air Flow Setpoint BAS and controls the airflow to this setpoint (Air Flow Setpoint Active). The flow
tracking controller does not require a space temperature sensor or a discharge air temperature
sensor. If the calculated airflow setpoint is less than 10% of the configured nominal airflow, and the
configured airflow tracking offset is less than zero, the air valve is closed. If the calculated airflow
setpoint is less than 10% of the configured nominal airflow, and the configured airflow tracking
offset is greater than or equal to zero, the air valve is positioned at the configured minimum airflow.
The maximum airflow setpoint is limited by the configured maximum airflow.
Reheat Control in Flow Tracking Control Operation
Reheat is not an option on a flow tracking controller.
Unoccupied Flow Tracking Control
In unoccupied control mode, the controller operates the air valve the same as it does in occupied
control mode. The controller enters this mode from a communicated command or from a local
occupancy sensor.
Exhaust
Comm Link
Supply STC VAV
To Other VAVs
or Main
Control Panel
Primary Air
From Main
AHU
Occupied Space
Exhaust FTC VAV
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