Heating mode
The control unit determines a set boil-
er water temperature subject to out-
side temperature or room temperature
(if a room temperature-dependent
remote control is connected) and the
heating curve slope/level. The deter-
mined set boiler water temperature is
then transferred to the burner control
unit. The burner control unit deter-
mines the heat demand and accord-
ingly regulates the two-stage burner.
The burner control unit limits the boil-
er water temperature: by means of the
control thermostat to 74 °C; by the
electronic temperature controller to 82
°C. The temperature limiter in the
safety chain locks out the burner con-
trol unit at a boiler water temperature
of 100 °C.
DHW heating
DHW heating will be enabled if the
cylinder temperature drops 2.5 K
below the set cylinder temperature.
The burner and the cylinder primary
pump are switched ON. In the deliv-
ered condition, the set boiler water
temperature lies 20 K above the set
cylinder temperature. The burner will
be switched OFF and the cylinder pri-
mary pump run-on time will be acti-
vated, if the actual cylinder
temperature rises 2.5 K above the set
cylinder temperature.
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