Application 2566 Vav Parallel Fan Powered With Electric Reheat; Overview; Fan Operation - Siemens BACNET 125-5037 Owner's Manual

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.
3 to 5 Straight Duct Diameters
required for proper sensor reading
Siemens Building Technologies, Inc.
Recirculated
Plenum Air
Air
Velocity
Sensor
Supply Air
Elec Heat
Stage 1
Electric Heat
Stage 2
Electric Heat
Stage 3
Hi/Lo Tubing
Connections
Figure 13. Application 2566 Control Drawing.
Siemens BACnet VAV Actuator Owner's Manual
Recirculated
Air Damper
Fan
Supply
Air Damper
"COMMON" Termination for all DOs
RTS
FLN
SAFETIES
BY
OTHERS
Modulating
Damper
Actuator
Wall Switch (Opt.)
NO
BACnet Actuator
Controller
17