TEL AFA4000/E - Page 99

AFA4000/E VAV Airflow Controller / p.99
12. If the sample is accepted, lower the sash by half and measure the face velocity using a
calibrated instrument. Use the ↑ / ↓ buttons to enter the measured face velocity and press
Mute. The monitor samples the airflow for 5 seconds.
13. If the calibration is successful, the monitor returns to the Main Menu. Select Run to go to
normal operating mode and check the velocity reading is accurate and stable.
14. If the calibration is stable and accurate, press and hold the Mute button for 5 seconds until
the Main Menu is displayed.
15. Use the ↑ / ↓ buttons to select Set Up Monitor, then Configure.
16. Enter the password (the factory default password is 0-0-0-0) and press Mute to continue.
17. Use the ↑ / ↓ buttons to select Econ Configure, then Manual/Auto followed by Mute.
18. Select Auto and press Mute to continue.
19. Select Done and press Mute.
20. Select Run to go to normal operating mode.
7.1.1 Possible messages
Message
Reason
Actions
Deviations too high
Airflow sample is unstable.
Follow the instructions to repeat
the sample or quit the
calibration.
Increase higher airflow
sample
Second sample value is too
close to the first sample value.
Close the sash slightly and repeat
the higher sample. The minimum
difference between the samples
that the controller will accept is
0.3 m/sec (60 fpm).
Sensor diff too low
The monitor does not detect
any difference in the sensor
output between the 2 airflow
samples.
Check that the sensor hose is
connected and repeat the
calibration.
7.1.2 Calibration notes
• Make sure the sensor hose is connected correctly at the side wall and rear of the sensor.
• Make sure the extraction fan is running and the fume cupboard is balanced before
calibrating the monitor.