Siemens BACNET 125-5037 - Manual (Page 28)

Applications
18 Siemens Building Technologies, Inc.
Application 2567 VAV Parallel Fan Powered with Hot
Water Reheat
Overview
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.
Fan Operation
The fan turns on when heating is required.
BACnet Actuator
Controller
Modulating
Damper
Actuator
TEC2567CDR1
Air
Velocity
Sensor
SAFETIES
BY
OTHERS
6
5
4
3
C
Wall Switch (Opt.)
"COMMON" Termination for all DOs
10K ohm Thermistor
or Spare DI
Hi/Lo Tubing
Connections
RTS
FLN
NO
Supply
Air Damper
Supply Air
Recirculated
Plenum Air
Recirculated
Air Damper
3 to 5 Straight Duct Diameters
required for proper sensor reading
Valve
Actuator Spare DO
Fan
Figure 14. Application 2567 Control Drawing.