Viessmann VITODENS 300 Service Instructions Manual page 53

Code 2
(cont.)
Parameters
Address A3:...
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
to
15
Coding in the delivered condition
Boiler circuit, mixer circuit
* 1
A4:0 With frost protection
*1
Only for weather-compensated control units.
Heating circuit pump
ON at
-10 °C
-9 °C
-8 °C
-7 °C
-6 °C
-5 °C
-4 °C
-3 °C
-2 °C
-1 °C
0 °C
1 °C
to
14 °C
Possible change
A4:1
Coding
OFF at
-8 °C
-7 °C
-6 °C
-5 °C
-4 °C
-3 °C
-2 °C
-1 °C
0 °C
1 °C
2 °C
3 °C
16 °C
No frost protection; this
setting is only possible if
code "A3: 9" has been
selected.
Note
When selecting a value
below 1 °C there is a risk
of pipes outside the ther-
mal envelope of the
building being damaged
by frost. The standby
mode, in particular,
should be taken into con-
sideration, e.g. during
holidays.
53