TEL AFA4000/2, Installation And Operating Manual

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AFA4000/2 Airflow Monitor / p.31
4. Overview: Auto Sash Controller
The Auto Sash Controller automates the opening and closing of the fume hood sash.
Automation of the sash movement provides an increased level of safety to the controlled
environment. A sash cannot be accidentally left open and can respond to safety critical
inputs from external sources, such as fire alarms and ventilation system failures.
The Auto Sash Controller facilitates cost savings. When linked to ventilation controls, the
automatic closing of an unattended fume hood allows extractor fan speeds and
electricity consumption to be reduced.
4.1 Features
The Auto Sash Controller has the following features:
•
Auto-Close The sash automatically closes when the fume hood is
unattended.
•
Auto-Open The sash automatically opens when the user returns.
• Sash Lock The sash is programmed to lock at a designated
position.
•
Manual Sash
Open/Close To open/close the sash manually.
•
Keypad Pushbutton
Open/Close To open/close the sash using the Keypad Pushbuttons.
•
Footswitch To open / close the sash using an optional, third party
supplied, footswitch.
•
Tilt Switch To disable the Auto Sash Control Unit using a, third
party supplied, tilt switch.
•
Building Management
System (BMS) Inputs The sash automatically closes when a signal is received
from the BMS.
•
Building Management
System (BMS) Outputs The Auto Sash Controller sends signals to the BMS
regarding the current status of the fume hood.