Siemens BACNET 125-5037 - Manual (Page 25)

Siemens BACnet VAV Actuator Owner’s Manual
Siemens Building Technologies, Inc. 15
Application 2564 VAV Series Fan Powered with
Electric Reheat
Overview
In Application 2564, 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 series fan for air circulation. In order for the terminal box to work properly, the central
air-handling unit must provide supply air. See Figure 11.
Fan Operation
CAUTION:
On series fan powered terminal boxes, the terminal box fan must be
controlled/interlocked to start either before or at the same time as the central air
handler. Failure to do so may cause the terminal box fan to rotate backwards and
cause consequent damage at start up.
In day mode, the fan is ON all the time. In night mode, the fan cycles on when heating or
cooling is required.
BACnet Actuator
Controller
Modulating
Damper
Actuator
TEC2564CDR1
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
3 Stage
Electric
Reheat
Supply Air
Recirculated
Plenum Air
Recirculated
Air Damper
3 to 5 Straight Duct Diameters
required for proper sensor reading
Fan
Elec Heat
Stage 3
Electric Heat
Stage 2
Electric Heat
Stage 1
Figure 11. Application 2564 Control Drawing.