30
Note
Only use suitable and approved leak detection agents
(EN 14291) and devices for the tightness test. Leak
detection agents with unsuitable constituents (e.g.
nitrides, sulphides) can cause material damage.
Remove residues of the leak detection agent after test-
ing.
Checking the combustion quality
The electronic combustion controller automatically
ensures optimum combustion quality. During commis-
sioning/maintenance, only the combustion values need
to be checked. For this, check the CO
2
or O
2
content.
For a description of the electronic combustion control-
ler functions, see page 91.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
CO
2
or O
2
content
■
The CO
2
content must be within the following limits
for the lower and upper heating output respectively:
–
7.7 to 9.2 % for natural gas E and LL
■
The O
2
content must be between 4.4 and 6.9 % for
all gas types.
If the actual CO
2
or O
2
values lie outside their respec-
tive ranges, proceed as follows:
■
Check the ionisation electrode and connecting cable;
see page 24.
Note
During commissioning, the combustion controller car-
ries out an automatic calibration. Allow approx. 30 s
after the burner has started before testing the emis-
sions.
A
Fig. 22
0
1.
Connect a flue gas analyser at flue gas port
A
on
the boiler flue connection. Measure the value in
the core flue gas flow.
0
2.
Open the gas shut-off valve. Start the boiler. Cre-
ate a heat demand.
0
3.
Set the lower heating output (see page 31).
0
4.
Check the lower heating output.
0
5.
Check the CO
2
content. If the actual value devi-
ates from the aforementioned ranges by more
than 1 %, check the ionisation electrode and con-
necting cable. See section "CO
2
or O
2
content".
0
6.
Enter the actual value into the report.
0
7.
Set the upper heating output (see page 31).
0
8.
Check the CO
2
content. If the actual value devi-
ates from the aforementioned ranges by more
than 1 %, check the ionisation electrode and con-
necting cable. See section "CO
2
or O
2
content".
0
9.
After testing, press
OK
.
10.
Enter the actual value into the report.
Commissioning, inspection, maintenance
Checking all gas equipment for tightness at…
(cont.)
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