Operating instructions

157
Air ratio λ– CO
2
/O
2
content
Air ratio λ O
2
content
(%)
CO
2
content
(%) for natu-
ral gas E
CO
2
content
(%) for natu-
ral gas LL
CO
2
content
(%) for LPG P
1.20 3.8 9.6 9.2 11.3
1.24 4.4 9.2 9.1 10.9
1.27 4.9 9.0 8.9 10.6
1.30 5.3 8.7 8.6 10.3
1.34 5.7 8.5 8.4 10.0
1.37 6.1 8.3 8.2 9.8
1.40 6.5 8.1 8.0 9.6
1.44 6.9 7.8 7.7 9.3
1.48 7.3 7.6 7.5 9.0
For optimum combustion control, the
system regularly carries out an auto-
matic self-calibration; also after a power
failure (shutdown). For this, the combus-
tion is briefly regulated to max. ionisation
current (corresponding to air ratio λ=1).
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 control unit
(cont.)
5772 909 GB
Service