Function Description; Constant Temperature Control Unit; Control And Display Elements - Viessmann VITODENS 200-W Service Instructions Manual

Constant temperature control unit

Control and display elements

A Pressure gauge
B Fault indicator (red)
C Optolink interface
only in conjunction with the diag-
nostic adaptor (accessory) and
Vitosoft (accessory)
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 operation
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.

Function description

D ON indicator (green)
E Reset button
F User interface
G ON/OFF switch
G Heating and DHW
/ No function
b/a Setting values
d Confirmation
c Information
e Standard settings (Reset)
The electronic temperature limiter
inside the burner control unit limits the
boiler water temperature to 82 °C.
Flow temperature setting range: 40 to
74 °C.
91