Weather-Compensated Control Unit - Viessmann VITODENS 200-W Service Instructions Manual

Function description

Weather-compensated control unit

Boiler temperature
Heating
DHW
Solar energy
Information
Select with
Heating mode
The control unit determines a set boiler
water temperature subject to outside
temperature or room temperature (if a
room temperature-dependent remote
control is connected) and to the slope/
level of the heating curve.
The determined set boiler water temper-
ature is transferred to the burner control
unit. From the set and actual boiler water
temperatures, the burner control unit cal-
culates the modulation level and regu-
lates the burner accordingly.
DHW heating
The burner and the circulation pump for
cylinder heating are started if the cylinder
temperature lies 2.5 K below the set cyl-
inder temperature.
118
48 °C
(
The electronic temperature limiter inside
the burner control unit limits the boiler
water temperature to 82 °C.
In the delivered condition, the set boiler
water temperature is 20 K higher than
the set DHW temperature (adjustable via
coding address "60"). The burner will be
switched OFF and the circulation pump
run-on time will begin, if the actual cylin-
der temperature exceeds the set cylinder
temperature by 2.5 K.