AFA4000/E VAV Airflow Controller / p.26
• Pushbutton I Run Down Timer = set to the required post-
purge time
• Pushbutton 2 icon set to Services On/Off, Relay Output 2
Operation:
Fan On / Pre-purge period
• Services Output disabled
• Services icon flashes
• Fan runs
• Services icon = Rst.
Can be switched on if
airflow is safe.
Will revert to Rst (Off) if
Low Air Alarm activates.
Disabled until airflow is
safe.
Fan Off / Post-purge period
• Services Output Off
• Services icon flashes
• Fan runs for post=purge
period, then switches off.
• Pushbutton II set to Pump On / Off
• Pump On / Off Relay operates
• Pushbutton II set to Setback Override On / Off
• Night setback function is overriden
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