AFA4000/E VAV Airflow Controller / p.184
12. Operation: Auto Sash Controller
12.1 Control philosophy
When all components are installed, setup and calibrated correctly, the Auto Sash Controller
closes the sash after a pre-set delay, provided that the area in front of the fume hood is clear.
The following additional protocols also apply:
• When the user returns to the fume hood during the delay period, the control timer will stop
and reset once the user leaves the fume hood again.
• When the user returns to a fume hood that is closing, the drive will stop when it senses the
user.
• When an obstruction is detected under the sash, the Auto Sash Controller will not open or
close the sash and will give a visual alarm to indicate a fault condition.
• When an obstruction is detected whilst the sash is closing, the sash drive will stop and give
a visual indication to demonstrate a fault condition. To reset the fault alarm, press the reset
button.
• When the sash starts to close a timer is initiated. When the sash does not close within the
specified time, the sash drive will stop and will give a visual alarm to indicate a fault
condition.
• When a user is present in front of the fume hood, the sash can be operated by hand.
• The sash can only be manually lifted to the normal position when the Auto stop is enabled.
12.2 Modes of operation
The Auto Sash Controller has the following modes of operation:
• User Present
• User Not Detected
• Auto-Open (User Configurable)
• Building Management System (BMS) Inputs
• Sash Lock
• Auto Lock
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