TEL AFA4000/E - Calibration Procedures for AFA4000;E; Calibrating Airflow Monitors

AFA4000/E VAV Airflow Controller / p.98
7. Calibration
7.1 AFA4000/E and AFA4000/E/AS Airflow Monitors
The airflow monitor must be calibrated when it is first installed, or when required during use.
When the unit is powered up, the AFA4000 either enters Run mode (if it has already been
calibrated), or it displays the message Requires set up, press Mute to continue. The Set Up menu
allows the unit to be calibrated or configured (password required).
To calibrate the monitor:
1. From the Run Screen press and hold the Mute button for 5 seconds until the Main Menu is
displayed.
Note: When you go from the main menu to the run screen, a note briefly appears saying
‘calibration required’.
2. Use the ↑ / ↓ buttons to select Set Up Monitor, then Configure.
3. Enter the password (the factory default password is 0-0-0-0) and press Mute to continue.
4. Use the ↑ / ↓ buttons to select Econ Configure, then Manual/Auto followed by Mute.
5. Select Manual and press Mute to continue.
6. Open the sash to the normal operating height and use a calibrated instrument to measure
the face velocity.
7. Use the ↑ / ↓ buttons to adjust the manual output so the face velocity is equal to the design
velocity (e.g. 0.5 m/sec (100 fpm)). Press Mute.
8. Select Done followed by Mute. This manually sets the output to a fixed value to allow the
airflow sensor calibration.
9. Use the ↑ / ↓ buttons to select Set Up Monitor, then Calibration.
10. Enter the password (the factory default password is 0-0-0-0) and press Mute to continue.
Note: The Monitor Set up Menu also includes Calibration and Password sub-menus which
are used by engineers to set up the system. If you enter any of the Monitor Set up
sub-menus by accident, press the ↑ and ↓ arrows together when the password is
requested to return to the Monitor Set up menu.
11. With the sash open to the normal operating height measure the face velocity using a
calibrated anemometer. Use the ↑ / ↓ buttons to enter the measured face velocity then press
Mute. The monitor samples the airflow for 5 seconds.