56
The electronic combustion controller automatically
ensures optimum combustion quality. During commis-
sioning/maintenance, only the combustion values need
to be checked. To do this, test the CO content and CO
2
or O
2
content, and record these in the report on
page 105.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
Permissible CO content
The CO content must be < 1000 ppm for all gas types.
Permissible CO
2
or O
2
content
Operation with natural gas
Rated heating out-
put (kW)
CO
2
content (%) O
2
content (%)
Upper heating out-
put
Lower heating out-
put
Upper heating out-
put
Lower heating out-
put
19 7.3 to 10.5 7.3 to 10.5 2.1 to 8.4 2.1 to 8.4
25 7.3 to 10.5 7.3 to 10.5 2.1 to 8.4 2.1 to 8.4
Operation with LPG
Rated heating out-
put (kW)
CO
2
content (%) O
2
content (%)
Upper heating out-
put
Lower heating out-
put
Upper heating out-
put
Lower heating out-
put
19 8.4 to 11.8 8.4 to 11.8 3.1 to 8.1 3.1 to 8.1
25 8.4 to 11.8 8.4 to 11.8 3.1 to 8.1 3.1 to 8.1
If the actual CO, CO
2
or O
2
values lie outside their
respective ranges, proceed as follows:
■
Check the balanced flue system for leaks: See
page 45.
■
Check the ionisation electrode and connecting cable:
See page.
Note
During commissioning, the combustion controller car-
ries out an automatic calibration. Allow approx. 50 s
after the burner has started before testing the emis-
sions.
Fig. 43
1.
Connect a flue gas analyser at flue gas port
A
on
the boiler flue connection.
2. Open the gas shut-off valve. Start the boiler. Cre-
ate a heat demand.
3. Adjust the lower heating output. See the following
chapter.
4. Check the CO
2
content. If the actual value deviates
from the permissible ranges, implement steps lis-
ted above.
5. Enter the actual value into the report.
6. Adjust the upper heating output. See the following
chapter.
Commissioning, inspection, maintenance
Checking the combustion quality
6221465
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