Siemens BACNET 125-5037 - Manual (Page 27)

Siemens BACnet VAV Actuator Owner’s Manual
Siemens Building Technologies, Inc. 17
Application 2566 VAV Parallel Fan Powered with
Electric Reheat
Overview
In Application 2566, the controller modulates the supply air damper of the terminal box for
cooling and controls stages of electric reheat 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, which 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 13.
Fan Operation
The fan turns on when heating is required.
BACnet Actuator
Controller
Modulating
Damper
Actuator
TEC2566CDR1
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
Fan
Elec Heat
Stage 1
Electric Heat
Stage 2
Electric Heat
Stage 3
Figure 13. Application 2566 Control Drawing.