AFA4000/E VAV Airflow Controller / p.36
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:
The sash automatically closes when the fume hood is
unattended.
The sash automatically opens when the user returns.
Touch sensitive sash movement (menu selectable)
The sash is programmed to lock at a designated position.
To open/close the sash manually.
• Keypad Pushbutton
Open/Close
To open/close the sash using the Keypad Pushbuttons.
To open / close the sash using an optional footswitch.
To disable the Auto Sash Control Unit using a tilt switch.
• Building Management
System (BMS) Inputs
The sash automatically opens or 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.
When manually operated the sash stops at the mid position
The sash is stopped if the load increases above a set level
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