Constant Volume - General - Critical Room Control CRC-FHM User Manual

Constant Volume - General

Constant Volume Sensing uses direct feedback from the CRC-CLV to monitor and sum the volume
of air that is being exhausted. This value is displayed on the front screen and can be
communicated to the rooms control system to accurately calculate total exhaust.
Fume Hood Monitor and Controller – User Guide
Select "Constant Volume"
Select "cfm" or "l/p"
Reduces or eliminates small fluctuations
in air volume
Set DP high value for valve (usually 2" WC)
Set DP low value for valve (usually 0" WC)
Set K Factor for valve
Show / hide commissioning info on front screen
To "Zero" the exhaust valve's voltage signal, first
shunt the high and low port on the valve's
transducer, then press "Zero Valve" to set the
voltage input that corresponds with zero air flow.
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