TEL AFA4000/2, Installation And Operating Manual

Page: 32 / 177

AFA4000/2 Airflow Monitor / p.32
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.