Viessmann Vitoligno 300-P Service Instructions For Contractors page 67

Code 2
(cont.)
Coding in the delivered condition
BC:1 Forced heat transfer
when exceeding the max.
boiler water temperature.
The mixer regulates to
the set flow temperature,
and the DHW heating is
enabled
C3:125 Mixer runtime 125 s
C4:1 System dynamics
Mixer control characteris-
tics
C5:20 Electronic minimum flow
temp. limit, i.e. 20 °C
(only during operation
with standard room tem-
perature)
C6:75 Electronic maximum flow
temperature limit set to
75 °C
C8:31 With remote control unit
and for the heating circuit,
operation with room tem-
perature hook-up must be
programmed:
Without room influence
D5:0 With external heating pro-
gram changeover:
Heating program
switches to "Constant
central heating with
reduced room tempera-
ture"
Possible change
BC:0 No forced heat transfer
C3:10 Runtime adjustable from
to 10 to 255 s
C3:255
C4:0 Controller responds too
to quickly (cycles between
C4:3 "Open" and "Close"):
Select a lower value.
Controller responds too
slowly (temperature is not
held sufficiently):
Select a higher value.
C5:1 Minimum limit adjustable
to from 1 to 127 °C
C5:127
C6:10 Maximum limit adjustable
to from 10 to 127 °C
C6:127
C8:1 Room influence limit
to adjustable from 1 to 30 K
C8:30
D5:1 Heating program switches
to "Constant central heat-
ing with standard room
temperature"
Codes
67