Flue system types
Available in the following countries
GB, IE
Gas categories
Available in the following countries
GB, IE
Electronic combustion control unit
The electronic combustion controller utilises the physi-
cal correlation between the level of the ionisation cur-
rent and the air ratio
. The maximum ionisation cur-
λ
rent is achieved at an air ratio of 1 for all gas qualities.
The ionisation signal is evaluated by the combustion
controller. The air ratio is regulated to a value that is
between
= 1.2 and 1.5. This range provides for an
λ
optimum combustion quality. Thereafter, the electronic
gas train regulates the required gas volume subject to
the prevailing gas quality.
To check the combustion quality, the CO
the O
content of the flue gas is measured. The pre-
2
vailing air ratio is determined using the actual values.
Flue system types
B
, B
23
23P
Gas categories
I
/I
2N
2H
To achieve optimum combustion control, the system
regularly carries out an automatic self-calibration; also
after power failures (shutdown). For this, the combus-
tion is briefly regulated to maximum ionisation current
(corresponding to air ratio
place shortly after the burner starts. The process lasts
approx. 20 s during which higher than normal CO
emissions may occur briefly.
content or
2
, B
, C
, C
, C
, C
, C
33
13
33
53
63
2N/2H - G 20 - 20 mbar
=1). Self-calibration takes
λ
Specification
, C
, C
83
83P
93
75