Operating instructions

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)
D ON indicator (green)
E Reset button
F User interface
G ON/OFF switch
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
G Heating and DHW
/ Comfort mode
b/a Setting values
d Confirmation
c Information
e Standard settings (Reset)
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.
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.
Constant temperature control unit
90
Function description
5692 672 GB