144
Air factor λ – CO
2
/O
2
content
Air factor λ O
2
content (%) CO
2
content (%) for nat-
ural gas H
CO
2
content (%) for
LPG P
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
To achieve an optimum combustion con-
trol, the system regularly carries out an
automatic self-calibration; also after a
power failure (shutdown). For this, the
combustion is briefly regulated to max.
ionisation current (equals air factor λ=1).
The automatic calibration is carried out
shortly after the burner start and lasts
approx. 5 s. During calibration, higher
than normal CO emissions may occur
briefly.
Function description
Electronic combustion controller
(cont.)
5412 755 GB
