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 105.
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
value lies outside the respective range, proceed with the
following steps:
&
Check the balanced flue system for soundness, see page 17.
&
Check the ionisation electrode and connecting lead, see page 20.
&
Check the parameters of the combustion control unit, see page 91.
Note
During commissioning, the combustion control unit carries out an automatic
calibration. This may lead to CO emissions in excess of 1000 ppm for a short
time.
1.
Connect a flue gas analyser at flue
gas port
A
on the flue outlet.
2.
Open the gas shut-off valve, start
the boiler and create a heat
demand.
3.
Adjust the lower output.
Constant temperature control unit:
&
Press both keys
9
and
d
simul-
taneously, until the display shows
"1".
Weather-compensated control unit:
&
Press both keys
9
and
d
simul-
taneously until the display shows
"Relay test".
&
With
a
/
b
in the display, select
"Base load".
Further details regarding the individual steps
(cont.)
15
Initial start-up, inspection, maintenance
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