Function Description; Constant Temperature Control Unit - Viessmann Vitodens 200-W Installation And Service Instructions Manual

Constant temperature control unit

s
Heating mode
The selected set boiler water tempera-
ture will be maintained when a demand
is being raised by the room thermostat
and the heating program is set to DHW
and central heating "G".
The boiler water temperature will be
maintained at the default frost protection
temperature when there is no demand.
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.
°C
4 8
A
The electronic temperature limiter inside
the burner control unit limits the boiler
water temperature.
Flow temperature setting range: 20 to
74 °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.

Function description

143