TEL AFA4000/E - Auto Sash Control Options

AFA4000/E VAV Airflow Controller / p.37
4.2 Auto Sash control options
To open / close the fume hood sash the Auto Sash Controller is fitted with:
• A Tiptronic open/close control via the Sash Position Sensor.
• A Sash Low micro-switch
• A Sash Low proximity switch
4.2.1 Auto Sash Controller with Tiptronic open / close control
Tiptronic Open / Close control is the default control setup. It functions via a Sash Position Sensor
(sprung potentiometer) with a draw wire (1.2m long) attached to either the sash or the
counterweight. The Auto Sash Controller can then be calibrated to give three methods of
operation:
Method A - Close only
• The bottom position is calibrated.
• The sash automatically drives to the bottom position,
when the user is not present.
• Press the ↓ pushbutton to drive the sash to the bottom
position, when the user is present.
• The ↑ pushbutton is disabled.
Method B - 2 Positions
• The bottom and mid-positions are calibrated.
• The sash automatically drives to the bottom position,
when the user is not present.
• Press the ↓ pushbutton to drive the sash to the bottom
position, when the user is present.
• Press the ↑ pushbutton to drive the sash to the mid-
position, when the user is present.
• When the Tiptronic feature is enabled, manually tip the
sash upwards and the sash will drive to the mid-position.
• Manually tip the sash downwards and the sash will drive
to the bottom position.
• When the Auto Open feature is enabled, the sash
automatically drives to the mid-position when the user is
present.
• There is a time delay following user detection.