Application 2567 VAV Parallel Fan Powered with Hot
In Application 2567, the controller modulates the supply air damper of the terminal box to
provide for cooling and modulates a hot water valve for heating. When in heating, the
terminal box either maintains minimum airflow or modulates the supply air damper. The
terminal box also has a parallel fan that re-circulates the room air. In order for the terminal
box to work properly, the central air handling unit must provide supply air. See Figure 14.
The fan turns on when heating is required.
3 to 5 Straight Duct Diameters
required for proper sensor reading
Figure 14. Application 2567 Control Drawing.
"COMMON" Termination for all DOs
Siemens Building Technologies, Inc.
Wall Switch (Opt.)