Siemens 125-5033 - Manual (Page 19)

Siemens Building Technologies, Inc. 11
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Applications
Fume Hood Controller: 2-Position Constant Volume
Application 940 is designed for use with a constant volume or two-position fume hood in a
manifold fume hood exhaust system. In this application, two position fume hoods have an
individual exhaust damper or venturi air valve connected to a central fan. The application
modulates the exhaust flow control device to maintain a high or low flow setpoint based on
inputs from the ODP (Operators Display Panel), Digital Input, an exhaust airflow sensor, and
the controller setpoints (Figure 10).
Figure 10. Application 940 Control Drawing shown using a damper.