Viessmann VITODENS 200-W Service Instructions Manual page 90

Function description
Weather-compensated control unit
DHW heating with a gas fired boiler
The burner, the circulation pump and the
three-way valve are started or changed
over if the cylinder temperature lies 2.5
K below the set cylinder temperature.
Boosting DHW heating
The booster heating function is activated
if a switching period is selected for the
fourth time phase.
90
(cont.)
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.
The set temperature value for the heat-
ing boost is adjustable in coding address
"58".