Heating Mode; Dhw Heating; Boosting Dhw Heating - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Weather-compensated control unit

Heating mode

The control unit determines a set boiler water tempera-
ture subject to outside temperature or room tempera-
ture (if a room temperature-dependent remote control
is connected) and to the slope
curve.
The determined set boiler water temperature is trans-
ferred to the burner control unit. From the set and
actual boiler water temperatures, the burner control
unit calculates the modulation level and regulates the
burner accordingly.

DHW heating

The burner and the circulation pump for cylinder heat-
ing are started if the cylinder temperature lies 2.5 K
below the set cylinder temperature.

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.
(cont.)
level of the heating
/
The electronic temperature limiter inside the burner
control unit limits the boiler water temperature.
In the delivered condition, the set boiler water temper-
ature is 20 K higher than the set DHW temperature
(adjustable via coding address "60" in group
"DHW"/3). The burner will be switched off and the cir-
culation pump run-on time will begin, if the actual cylin-
der temperature exceeds the set cylinder temperature
by 2.5 K.
Heating is boosted during the periods selected in this
time phase.
Function description
115