Vitodens 200-W, B2HA 19 to 80 Technical Data
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Combustion Management System
The combustion management system utilizes the physical
correlation between the level of the ionization current
and the air factor
λ
. For all gas qualities, the maximum
ionization current results with air factor
λ
.
The ionization signal is evaluated by the combustion
management system, and the air factor is adjusted to
between
λ
=1.24 and 1.44. This range provides for an
optimum combustion quality. Thereafter, the electronic
gas valve regulates the required gas volume based on the
prevailing gas quality.
To check the combustion quality, the CO
2
content or the
O2 content of the flue gas is measured. The actual values
enable the prevailing air factor to be determined.
The relationship between the CO
2
or O2 content and
air factor
λ
is illustrated in the table below.
To achieve an optimum combustion control, the system
regularly performs an automatic self-calibration; also after
a power failure (shutdown). For this, the combustion is
briefly regulated to max. ionization current (equals air factor
λ
=1). The automatic calibration is performed shortly after
the burner starts and lasts approximately 5 seconds. During
the calibration, higher than normal CO emissions may occur
briefly.
The combustion management system can also be
calibrated manually, e.g. after maintenance or service
work (coding address “85”, see Service Instructions).
The Vitodens 200-W, B2HA boilers come equipped with Lambda Pro, the industry’s first intelligent combustion
management system. The boiler adjusts automatically to any gas type and quality without the need for a fuel
conversion kit.
Air factor
λ
- CO
2
/O2 content
Air factor
λ
O2 content (%)
CO
2
content (%) for natural gas
CO
2
content (%) for liquid propane gas
1.20
3.8
9.6
11.3
1.24
4.4
9.2
10.9
1.27
4.9
9.0
10.6
1.30
5.3
8.7
10.3
1.34
5.7
8.5
10.0
1.37
6.1
8.3
9.8
1.40
6.5
8.1
9.6
1.44
6.9
7.8
9.3
1.48
7.3
7.6
9.0
Management System
