Installation & Servicing instructions
AT
AG XL
53
13.2.2
Check O
2
The O
2
percentage is set by the factory. It has to be checked during inspection,
maintenance and faults.
It can be checked as follows:
- Ensure that the boiler is at maximum load and can dump the heat generated;
- Press down the arrow buttons simultaneously for 2 seconds.
The screen turns green;
- Press the right arrow button until you see Service chapter.;
- Press OK;
The screen displays Throttle;
- Press OK;
The screen displays Throttle off;
Only for XL110 and XL140:
- Press the right arrow button to select burner A.
The exchanger symbol displays the selected burner (AB, A or B)
- Calibrate the O
2
meter ;
- Position the lance of the O
2
meter into the flue outlet test point (refer to fig. 13.2.2.a);
- Press on the + button until the maximum value (in kW) has been reached;
The boiler will be burning at the rated full capacity (value on display in %)
- Leave measuring O
2
to the measuring equipment.
Natural
gas
Propane
- O
2
percentage at full load = 4,7% (+/-0,2%)
5,1% (+/-0,2%)
- CO/CO
2
ratio less than 0.004%
- If required, you may turn the setting screw to set the correct O
2
percentage.
(refer to fig. 13.2.2.b).
Finally, the O
2
percentage at low load must be checked:
- Press on the - button until the value1 has been reached.
The boiler will be burning at low capacity (value on display in %).
- Leave measuring O
2
to the measuring equipment and check if the measured O
2
percentage on low load is between following values:
Natural
gas
Propane
- O
2
percentage at low load
between 5,0% and 7,0%
5,1% and 7,0%
- CO/CO
2
ratio less than 0.004%
Contact ATAG Heating when the measured values is outside this range.
End of measuring:
- Press the – button until
off
is displayed (keep pushed down).
This ends the procedure for burner A.
Only for XL110 and XL140:
- Press the return button 1x
- Press the right arrow button to select burner B.
The exchanger symbol displays the selected burner (AB, A or B)
Repeat the procedure for burner B.
- Press the return button to return to the original read-out.
Measuring point figure 13.2.2.a
adjusting screw figure 13.2.2.b
