Viessmann Vitodens 200, Service Instructions Manual

Page: 60 / 116

60
Control unit for weather-compensated mode with standard prog. unit
Function description
Heating mode
The control unit determines a set
boiler water temperature subject to
the outside temperature or the room
temperature (if a room temperature-
dependent remote control is
connected) and the slope/level of the
heating curve.
The determined set boiler water
temperature is then transferred to the
burner control unit.
From the set and actual boiler water
temperatures, the burner control unit
calculates the modulation level and
controls the burner accordingly.
The burner control unit limits the
boiler water temperature:
H by the limit thermostat to 84Ă º C,
H by the electronic high limit
thermostat to 82Ă º C.
The thermocouple in the safety chain
locks out the burner control unit at
100Ă º C boiler water temperature.
Supplementary DHW heating
The supplementary heating facility
will be activated if a control period of
10Ăminutes (e.g. 22:10 to 22:20Ăhrs)
has been selected. This period must
lie outside the control range for
normal DHW heating, to enable the
control unit to recognise the signal.
You can set the temperature value
for supplementary heating in coding
addressĂ"107".
5692Ă485
G
B