TEL AFA4000/2, Installation And Operating Manual

Page: 92 / 177

AFA4000/2 Airflow Monitor / p.92
7. Calibration
7.1 AFA4000/2 Airflow Monitor
The airflow monitor must be calibrated when it is first installed, or when required during
use.
When the unit is powered up the following sequence of events occur:
1. The 12 Vdc power is applied to the airflow sensor and a delay on timer is initiated.
2. The alarm then performs a self-test on the display and all indicators.
3. At the end of the delay period the unit performs one of two options:
a. The unit goes into normal operating Run mode when the monitor calibration has
been previously completed.
b. When the unit has not been calibrated, the unit displays ‘Unit requires Set up --
press Enter to access Set up menu’. The Set Up menu allows the unit to be
calibrated or configured (password required).
Note: When the unit has been set with a Fan Stop / Start pushbutton, the monitor
can be set to Run mode before it is calibrated, to allow the Fan to be Started. To
Enter the menu from the Run screen, press and hold the
Mute button for 5
seconds or until the main menu appears.
During the set-up all alarms and output relays are inhibited.
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 Calibration .
3. 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