Dhw Heating - Viessmann VITODENS 200-W Service Instructions Manual

Weather-compensated control unit
Keys at the user interface:
A Central heating time pro-
gram
B DHW heating and DHW cir-
culation pump time pro-
grams (if connected to the
control unit)
H Holiday program
D Time/date
E Reduced room temperature
F Set DHW temperature
Heating operation
The control unit determines a set boil-
er water temperature subject to out-
side temperature or room temperature
(if a room temperature-dependent
remote control is connected) and to
the slope/level of the heating curve.

DHW heating

The burner and the cylinder primary
pump are started if the cylinder tem-
perature lies 2.5 K below the set cylin-
der temperature.
Function description
(cont.)
O+F Emissions test function
K Standby mode
L DHW only
G Heating and DHW
M Party mode
N Economy mode
b/a Setting values
d Confirmation
c Information
e Standard settings (Reset)
The determined set boiler water tem-
perature is transferred 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 accord-
ingly.
The electronic temperature limiter
inside the burner control unit limits the
boiler water temperature to 82 °C.
In the delivered condition, the set boil-
er water temperature is 20 K higher
than the set DHW temperature (adjus-
table via coding address "60"). The
burner will be switched OFF and the
circulation pump run-on time will
begin, if the actual cylinder tempera-
ture exceeds the set cylinder tem-
perature by 2.5 K.
93