Weather-Compensated Control Unit - Viessmann VITODENS 333-F WS3A Service Instructions Manual

Weather-compensated control unit

Control and display elements
A Pressure gauge
B Fault display (red)
C ON indicator (green)
D Reset button
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 mode
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.
Function description
E User interface
F Rotary selector for standard room
temperature
G ON/OFF switch
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 boiler water temperature will be
limited:
93