VFHOMT-11/18
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8
Operating Procedures
Supreme Air Venturi Fume Hood Options
Auto Sash
Auto Sash Return
The Auto Sash Return option is a passively balanced system that lowers the
open sash to an 18” operating height. When the sash is raised to the full open
position, a sash lock holds the sash open for set-up purposes. By pressing the
electronic sash stop release button, the sash automatically closes to the 18"
operating height.
Push Button Sash
The Push Button Sash, located within the light control panel, is a motorized
sash controller that opens or closes the sash. From the closed position, a single
push of the up button will open the sash to a preprogrammed sash stop height
and another push of the up button will then fully open the sash. From the open
position, a single push of the down button will fully close the sash. At any time
a user may interrupt the mechanism, and stop sash travel, by pushing the stop
button. In the event of a sash obstruction the sash will stop and retract a few
inches so the object can be removed. When the mechanism is not in operation,
the sash can be manually opened or closed. The standard electromechanical
sash stop is not provided when this option is chosen. The push button sash
mechanism is supplied installed and prewired to a junction box located on the top
of the hood.
Split sash hoods are equipped with two sash controllers-one for each sash.
Auto Sash Operator
The Proximity Sash is designed to close the sash after it has been left open
for a set period of time. Using an Overhead Motion Sensor the system senses
operator absence and then closes the sash after a programmable time period
(0-3600 seconds). At any time a user can override this function and manually
adjust the sash.
The system also includes a photoelectric sensor which scans the sash plane for
obstructions. Any obstruction will halt sash descent and issue a warning. Once
the obstruction is removed the system will reset and sash operation will continue.
All control variables are user programmable. See supplemental Proximity Sash
manual for more information.
The Automatic Sash Operator is supplied factory installed and prewired to a
junction box located on the top of the hood.
NOTE: The Proximity Sash Operator can be programmed to open or close a
sash. As it is possible that an occurrence in a fume hood could be complicated
by opening the sash, Kewaunee recommends this system to be used only for
closing the sash. Therefore, the choice of opening of a sash should be manually
performed.
Summary of Contents for Supreme Air Series
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