25
Flue gas emissions test
The electronic combustion control unit automatically ensures an optimum combustion
quality. Only the combustion values need to be checked during commissioning 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
values lie outside their respective ranges, check the balanced
flue system for tightness, see page 18.
Note
During commissioning, the combustion control unit carries out an automatic calibra-
tion. Only test the emissions approx. 30 s after the burner has started.
A
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.
Weather-compensated control
unit:
K
+
d
press simultaneously:
"
Relay test
" and then
"
Base load
" is shown.
4.
Check the CO
2
content. Should the
actual value deviate from the above
ranges by more than 1 %, implement
steps from page 25.
5.
Enter actual values into the service
report.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 760 GB
Summary of Contents for VITOCONTROL-S, WB2B
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