Checking all gas equipment for tightness at operating pres-
sure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.
Checking the combustion quality
The electronic combustion control unit automatically ensures an optimum com-
bustion quality. Only the combustion values need to be checked during commis-
sioning and maintenance. For this, check the CO
2
or O
2
content. For a function
description of the electronic combustion control unit, see page 103.
CO
2
or O
2
content
The CO
2
content must be within the following ranges (upper and lower output):
&
7.7 to 9.2% for natural gas E and LL
&
9.3 to 10.9% for LPG P
For all gas types, the O
2
content must be between 4.4% and 6.9%.
If the actual CO
2
or O
2
values lie outside their respective ranges, check the
balanced flue system for tightness.
Note
During commissioning, the combustion control unit carries out an automatic
calibration. Only test the emissions approx. 30 s after the burner has started.
1.
Connect a flue gas analyser at flue
gas port
A
on the boiler flue con-
nection.
2.
Open the gas shut-off valve, start
the boiler and create a heat
demand.
3.
Adjust the lower output.
Constant temperature control
unit:
K
+
d
press simultaneously:
"
1
" is shown.
Further details regarding the individual steps
(cont.)
22
Commissioning, inspection, maintenance
5692
673
GB
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