Electronic Combustion Control Unit - Viessmann VITODENS 200-W Service Instructions Manual

Remote control DIP switches
Remote control
The remote control affects the heating cir-
cuit without mixer A1
The remote control affects the heating cir-
cuit with mixer M2
When connecting a separate room tem-
perature sensor, set DIP switch "3" to
"ON".

Electronic combustion control unit

The electronic combustion controller uti-
lises the physical correlation between
the level of the ionisation current and the
air factor λ. For all gas qualities, the max-
imum ionisation current results with air
factor 1.
The ionisation signal is evaluated by the
combustion control unit, and the air fac-
tor is adjusted to between λ=1.24 and
1.44. This range provides for an optimum
combustion quality. Thereafter, the elec-
tronic gas valve regulates the required
gas volume subject to the prevailing gas
quality.
(cont.)
DIP switch setting
ON
1 2 3 4
ON
1 2 3 4
ON
1 2 3 4
To check the combustion quality, the
CO content or the O
2
gas is measured. The actual values ena-
ble the prevailing air factor to be deter-
mined. The relationship between the
content and air factor λ is illus-
CO or O
2 2
trated in the following table.
Function description
content of the flue
2
105