92
48 °C
Boiler temperature
HC1
14°C
21°C
Fig. 52
Heating mode
The control unit calculates a set boiler water tempera-
ture depending on the outside temperature and/or the
room temperature (if a room temperature-controlled
remote control facility is connected) and the slope/level
of the heating curve. The set boiler water temperature
determined is then transferred to the burner control
unit.
The burner control unit determines the heat demand
and accordingly regulates the modulating burner. The
boiler water temperature is limited in the burner control
unit: to 74 °C by the temperature controller, and to
82 °C by the electronic temperature limiter. The tem-
perature limiter in the safety chain locks out the burner
control unit at 100 °C boiler water temperature.
DHW heating
The burner, the circulation pump and the 3-way valve
are started or changed over if the cylinder temperature
lies 2.5 K below the set cylinder temperature.
In the delivered condition, the set boiler water temper-
ature is 20 K above the set cylinder temperature
(adjustable via coding address 60 in group
"DHW"
).
The burner will be switched off and the circulation
pump run-on time will begin if the actual cylinder tem-
perature exceeds the set cylinder temperature by 2.5
K.
Boosting DHW heating
This function is activated by specifying a second set
DHW temperature via coding address 58 in group
"DHW"
and activating the fourth DHW phase for DHW
heating.
Heating is boosted during the periods selected in this
time phase.
Function description
Control unit
5686 293 GB
Functions
