Viessmann Vitodens 333 Service Instructions Manual page 106
Compact gas fired condensing boiler. 4.2 to 19 kw natural gas and lpg version
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Also See for Vitodens 333:
- Service instructions manual (132 pages) ,
- Instruction manual (16 pages) ,
- Technical manual (180 pages)
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Function description
Electronic combustion control unit
Air factor
CO
/O
2
2
Air factor
O
content
2
(%)
1.24
4.4
1.27
4.9
1.30
5.3
1.34
5.7
1.37
6.1
1.40
6.5
1.44
6.9
To achieve an optimum combustion
control, the system regularly carries
out an automatic self calibration; also
after a power failure (shutdown). For
this, the combustion is briefly regu-
lated to max. ionisation current
(equals air factor =1). The automatic
calibration is carried out shortly after
the burner start and lasts approx. 5 s.
This may lead to CO emissions in
excess of 1000 ppm for a short time.
106
(cont.)
content
CO
content
2
(%) for natur-
al gas E
9.2
9.0
8.7
8.5
8.3
8.1
7.8
The combustion control unit can also
be calibrated manually. e.g. after
maintenance or service work (see
page 88).
CO
content
CO
content
2
2
(%) for natur-
(%) for LPG P
al gas LL
9.1
10.9
8.9
10.6
8.6
10.3
8.4
10.0
8.2
9.8
8.0
9.6
7.7
9.3
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