A.O. Smith 140 Benutzerhandbuch
Installation and Service Manual Upsilon-Series
52
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 UB 110 and UB 140:
- 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% (-1,2%, +0,8%) 5,1% (-1,2%, +0,7%)
CO
2
percentage at full load = 9,0% (-0,4%, +0,6%) 10,3% (-0.4%, +0.8%)
- 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
2
percentage at low load between 7,7% and 8,8%
9,1% and 10,3%
Contact A.O. Smith 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 UB 110 and UB 140:
- 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