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for at least one second activates
the TÜV function, i.e. the internal regulator/tempera-
ture controller function becomes inactive. The hea-
ting then operates at maximum heat output until the
safety temperature limiter responds (STB). Re-
leasing either of the two buttons interrupts the TÜV
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only for at least 3 seconds activates the
“regulator stop” function. This allows the fan speed
(and therefore the heat output) to be adjusted ma-
nually on the hot water setting potentiometer (e.g.
for adjusting the gas orifice, etc.). The boiler then
operates in its heating regime; the internal “on-off”
regulator and the temperature controller function
are active.
The regulator off function is ended by pressing the
button again or by switching off the burner.
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An oversized heat exchanger/condenser, with a wa-
ter-cooled combustion chamber in its upper part,
combines the functions of a heat exchanger and
condenser.
Condensation occurs on the tube walls where the
temperature is below the dew point for the combus-
tion products.
Efficiency curve at high/low setting:
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