Function Description Constant Temperature Control Unit - Viessmann Vitodens 200 Service Instructions Manual

Function description
Constant temperature control unit
Controls and display elements
A Pressure gauge
B Fault display (red)
C ON indicator (green)
Keys at the user interface:
O Set boiler water tempera-
ture
F Set DHW temperature
O+F Emissions test function
K Standby mode
L DHW only
Heating mode
The selected set boiler water tem-
perature 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 protec-
tion temperature when there is no
demand.
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D Reset button
E User interface
F ON/OFF switch
G Heating and DHW
/ No function
b/a Setting values
d Confirmation
c Information
e Standard settings (Reset)
The boiler water temperature will be
limited:
To 74 °C by the control thermostat
inside the burner control unit.
To 82 °C by the electronic tempera-
ture limiter inside the burner control
unit.
To 100 °C by the temperature limiter
in the safety chain (interlocks the
burner control unit).