AFA4000/E VAV Airflow Controller / p.39
4.2.2 Auto Sash Controller with Sash Low micro-switch
A Sash Low Micro-Switch can be specified for fitting by TEL or by the fume hood manufacturer.
The switch can be arranged to be open / closed when the sash is closed, depending on fitting.
The wiring arrangement must be modified for installation and the operational requirements of
the fume hood.
The following functionality is available:
• The sash automatically drives to the bottom position, when the user is not present.
• Press the Down pushbutton to drive the sash to the bottom position, when the user is
present.
• The Up pushbutton is disabled.
4.2.3 Auto Sash Controller with Sash Low proximity switch
A Sash Low Proximity Switch can be specified for fitting by TEL or the fume hood manufacturer.
The switch can be arranged to be open/closed when the sash is closed, depending on fitting. The
wiring arrangement must be modified for installation and the operational requirements of the
fume hood.
The following functionality is available:
• The sash automatically drives to the bottom position, when the user is not present.
• Press the Down pushbutton to drive the sash to the bottom position, when the user is
present.
• The Up pushbutton is disabled.
4.2.4 Auto Sash Controller DDA profile
The sash controller can be set to operate a DDA style fume hood with a moveable base. A
secondary sash position sensor is fitted to the base to detect the base position. Once a base
movement has been detected, the calibrated sash open height from the base will be maintained
when the sash is driven open, and the sash will close to the new base position when the sash is
driven closed or auto closes and will give the following operation:
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