TEL AFA4000/E, Installation And Operating Manual

Page: 131 / 210

AFA4000/E VAV Airflow Controller / p.131
item Instructions
Integral Time (cont.)
The ideal setting for this value is to select a value as high as
possible that gives stable control of the damper or Inverter
without ‘hunting’. Ref er to section 0 for a practical
explanation of how to set this value on a fume cupboard.
Boost Duration
This function is used in conjunction with the Sash position
sensor for VAV control.
When the sash is opened, the output drives to a calculated
position for a brief time period before the output switches
back to face velocity control. The Boost Duration is the time
period that the output is held before switching back to face
velocity control.
This parameter should not require an on-site setting and is
factory set to 5 seconds.
Boost Percentage
This function is used to adjust the pre-determined output
position that the damper drives to when the boost function
is active.
Done
Return to the Monitor Config menu (section 8.1.1).