Viessmann Vitoligno 300-C Installation And Service Instructions Manual page 96

Codes
Code 2
(cont.)
Coding in the delivered condition
Frost protection temperature
A3:2 Outside temperature below 1 °C:
Frost protection function "On"
Outside temperature above 3 °C:
Frost protection function "Off"
!
Please note
If the frost protection temperature is set to less
than 1 °C outside temperature, uninsulated
pipes may freeze.
There is a particular risk for outdoor pipes and in
standby mode, e.g. during holidays. Provide
pipes with thermal insulation and avoid unsuper-
vised standby mode.
Parameter address Frost protection function / heating cir-
"A3" cuit pump "On"
9 10 °C
− −
8 9 °C
− −
7 8 °C
− −
6 7 °C
− −
5 6 °C
− −
4 5 °C
− −
3 4 °C
− −
2 3 °C
− −
1 2 °C
− −
0 1 °C
−
1 0 °C
2 1 °C
to to
15 14 °C
Coding
Coding in the delivered condition
Frost protection activate
A4:0 The frost protection function is ac-
tivated. Start and stop tempera-
tures of the function can be adjus-
ted (code "A3", "Heating" group).
Frost protection function: The heat-
ing circuit pump is switched on at
the relevant outside temperature; a
min. flow temperature of 10 °C is
specified. At the relevant outside
temperature, the frost protection
function is automatically switched
off.
96
Possible change
A3:-9 Frost protection function "On"/"Off"
to See the following table:
A3:15
Frost protection function / heating circuit
pump "Off"
8 °C
−
7 °C
−
6 °C
−
5 °C
−
4 °C
−
3 °C
−
2 °C
−
1 °C
−
0 °C
1 °C
2 °C
3 °C
to
16 °C
Possible change
A4:1 The frost protection function is deac-
tivated. Adjustment only possible if
code "A3:−9" has been set.
Note
Observe the note for code "A3".