AFA4000/E VAV Airflow Controller / p.133
(seconds) in steps of 5 until the face velocity controls back to the set point over an
acceptable time.
If the Integral Time is set too low, the face velocity will take too long to control back to the
set point when the face velocity changes.
If the Integral Time is set too high, the Integral may over-compensate and create overshoot
and give unstable control.
Set the Integral Time to approximately 10 – 30 seconds.
9. The controller has an Auto Tune correction algorithm that increases the speed of response
once the measured airflow value drops below the set point value if the Prop band and
Integral settings are incorrect. The algorithm is only active when the measured airflow is
below the set point and the Integral value is set greater than zero.
8.4 AFA4000/E/AS configuration menus
Note: The Auto Sash menus are only available when the Auto Sash is connected.
To configure the AFA4000/E/AS Airflow Monitor, navigate to Main Menu > Set up Auto Sash >
Setup Menu to display the Menu options.
Press the ↓ button to scroll down the menu list and press Mute to select the required option.
8.4.1 Auto Sash setup menu
Note: The Setup menu is password protected. The default password is 1 0 0 1.
Note: Select the option Back to Setup Menu to return to the next option in the Auto Sash setup
menu.
To change options in the Auto Sash setup menu:
1. Press Mute to enter edit mode. The ‘>’ symbol next to the parameter is underlined.
2. Press the ↑ / ↓ buttons to scroll through the options.
3. Press Mute to select the option. The ‘>’ symbol underline disappears.
4. Press the ↓ button to scroll down to the next menu option.
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