Emergency Override - Critical Room Control CRC-FHM User Manual

IN USE:
FHM (Monitor only) - Selecting IN USE will display the IN USE graphic and activate
alarms based on the IN USE face velocity or airflow volume set point
FHC (Monitor and Control) – Selecting IN USE will display IN USE graphics and activate
the programmed IN USE face velocity or airflow volume set point. The onboard control
loop will make volume adjustments to the fume hood airflow to attain the IN USE set
point and activate alarms based on IN USE set point.
STANDBY:
FHM (Monitor only) - Selecting STANDBY will display the STANDBY graphic and
deactivate alarms.
FHC (Monitor and Control) – Selecting STANDBY will display STANDBY graphics and
activate the programmed STANDBY face velocity or airflow volume set point. The
onboard control loop will make volume adjustments to the fume hood airflow to attain
the STANDBY set point and deactivate alarms.

Emergency Override

The CRC-FHM/FHC emergency override offers the ability to command the hood exhaust to
maximum flow from any of the main screens. When the unit is put into Emergency Override, the
screen changes to red background and an audible alarm will sound. The control loop output (CRC-
FHC only) will automatically drive the exhaust valve fully open.
Fume Hood Monitor and Controller – User Guide
User selects "EMERGENCY
OVERRIDE" from any main screen
and the unit will switch to
EMERGENCY OVERRIDE Mode
7
The CRC_FHM/C will return to
"In Use" mode when user selects
"CANCEL OVERRIDE"
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