AFA4000/E VAV Airflow Controller / p.28
3.7.4 Input functions
The AFA4000/E has 3 programmable inputs that can be set to:
• Analogue (0 - 5 Vdc)
• Digital open operation or
• Digital closed operation
3.7.4.1 Analogue input functions
• Any Input set to Analogue - Temperature
• Temperature is displayed alongside airflow velocity in °C or °F (if
Show Temp is enabled)
• Low Temp toggles on / off with other alarms in the status window
if temperature is less than the Low Temp Alarm point
• Red Alarm LED Halo illuminated
• Audible alarm sounds - can be muted by pressing the Mute
pushbutton
• Low Temp relay operates (when configured)
• High Temp toggles on / off with other alarms in the status window
if temperature is higher than the High Temp Alarm point
• Red Alarm LED Halo illuminated
• Audible alarm sounds - can be muted by pressing the Mute
pushbutton
• High Temp relay operates (if configured)
• Temp Error toggles on / off with other alarms in the status
window if a temperature sensor input is configured but a sensor is
not connected to the controller
• Offset allows the displayed temperature to be offset by ± 5°C or ±
10°F
• Any Input set to Analogue – Sash Position
• Used to give calculated volumetric output signal based on sash
position and airflow velocity
• Can also be used to give Sash High Alarm
• Sash High toggles on / off with other alarms in the status window
if the sash height is higher than the calibrated position
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