Viessmann Vitodens 300 Service Instructions Manual page 54

Coding
Code 2
(cont.)
Parameters
Address A3:...
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
to
15
Coding in Function mode
the as
delivered
condition
Address:
value
Boiler circuit, mixer circuit
* 1
A4:0 With frost protection
*1
Only for weather-compensated control units.
54
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
Coding
change
Address:
value
A4:1
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
Possible change
No frost protection,
adjustment only possible
if code A3:-9 is selected.
Note
When selecting a value
below 1 °C there will be a
risk of pipes outside the
thermal insulation envel-
ope of the house freez-
ing-up. The standby
mode, in particular,
should be observed, e.g.
during holidays.