AFA4000/E VAV Airflow Controller / p.24
The AFA4000/E pushbuttons are typically set to:
• Pushbutton I set to Fan On / Off and is Off
• Pushbutton Fan Stop parameter set to Hide Airflow
• Screen Backlight dims to low power mode
• Red Alarm LED Halo illuminated
• All alarm functions and alarm function outputs are inhibited
when the fan is off.
Note: When the Fan Stop parameter is set to Show Airflow, in
the Fan OFF position, the controller displays the current
airflow and all input alarm functions remain active.
Fan On
Start Up (10 Seconds)
• Pushbutton I set to Fan On / Off and is On
• Extract Fan Relay is On
• Pushbutton Fan Start time parameter set to >0 seconds
• All alarm functions and outputs are inhibited during the start-
up time period
Start-up Timer: the start-up timer is used to allow the fan to run
up to full speed before the AFA1000/E alarm functions are active,
so that false Low Air alarms are not sent to the BMS.
Note: When the Fan Start Time is set to zero, and the fan is
switched ON, the airflow velocity displays and all alarm
functions are active as soon as the pushbutton is pressed.
• Pushbutton I set to Setback Override On / Off
• Night setback function is overriden
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