Siemens BACnet ATEC 125-5050 - Manual (Page 21)

Chapter 2 – Applications
21
Siemens Industry, Inc. BACnet ATEC Owner's Manaul
125-5050, Rev. AA 4/20/2010
See the following figure.
Fan Operation
The fan turns on when heating is required.
[insert TEC2566CD]
Application 2867 VAV Parallel Fan Powered with Hot Water Reheat
In Application 2867, the controller modulates the supply air damper of the terminal box
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. Application
2867 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 the following figure.