Electrical Output Of The Fuel Cell - Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual

Function description
Electronic combustion controller of gas...
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 and lasts for 20 s
approx. During calibration, higher than normal CO
emissions may occur briefly.

Electrical output of the fuel cell

Electrical output is influence by the gas quality and the
geodetic head. Electrical output is also reduced by a
decrease in the fuel cell's electrical efficiency over
time.
192
=1). Self-calibration takes
λ
(cont.)
Vitovalor PT2 is operated with constant heat input (gas
input) and constant overall efficiency. This means that
the ratio of electrical output to thermal output changes
over the service life. As the overall output remains con-
stant, electrical output decreases over the service life
while thermal output increases.