Operating Instructions

VI Siemens Building Technologies, Inc.

Applications .................................................................................................................. 13

Basic Operation ............................................................................................................ 13

Average Face Velocity Control .................................................................................. 13

Minimum and Maximum Flow Rates ......................................................................... 13

Display Filters ............................................................................................................ 14

Calibration ................................................................................................................. 14

Warning and Alarm Features .................................................................................... 14

Warning Operation .................................................................................................. 15

Alarm Operation ...................................................................................................... 15

Alarm Strategies ..................................................................................................... 15

Sash Area Alarms ................................................................................................... 16

Emergency Purge Feature ........................................................................................ 16

Emergency Purge Operation .................................................................................. 16

Emergency Purge Strategies .................................................................................. 17

Fail-safe Operation .................................................................................................... 18

Fume Hood Controller ............................................................................................ 18

Sash Sensor ........................................................................................................... 18

ODP ........................................................................................................................ 18

Differential Pressure Transmitter ............................................................................ 18

Pneumatic Damper Actuator .................................................................................. 18

Venturi Air Valve ..................................................................................................... 19

AO-P Module .......................................................................................................... 19

Electronic Actuator Assembly ................................................................................. 18

Fume Hood Controller: Universal Sash Configuration with Damper or Venturi Air

Valve .............................................................................................................................. 19

Application 941: Universal Sash with Damper .......................................................... 22

Control Loops ......................................................................................................... 23

Application 942: Universal Sash with Venturi Air Valve ............................................ 24

Venturi Calibration .................................................................................................. 25

Flow Control ............................................................................................................ 25

Airflow Control

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Calibration ............................................................................................................... 25

Venturi Air Valve Operation .................................................................................... 25

Point Database .............................................................................................................. 26

Troubleshooting ........................................................................................................... 32

Basic Service Information ......................................................................................... 32

Preventive Maintenance ............................................................................................ 32

Safety Features ......................................................................................................... 33