Viessmann Vitodens 222-F Installation And Service Instructions Manual page 75

Heating circuit 1, heating circuit 2, heating...
"Temperature limits, frost protection function"
Setting
2 see service instructions
... see service instructions
!
Please note
With settings below 1 °C, pipes outside the ther-
mal envelope of the building could freeze up.
Use settings below 1 °C only if pipes are appro-
priately thermally insulated.
"Frost protection"
Setting
With
Without
"Heating limit: Economy function outside temperature"
Setting
5 see service instructions
Without
... see service instructions
(cont.)
Explanations
A3:2 Outside temperature below 1 °C: Heating circuit pump
"ON"
Outside temperature above 3 °C: Heating circuit pump
"OFF"
A3:-9 to Heating circuit pump ON/OFF, see following table:
A3:15
Parameter
A3: ...
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
to
15
Explanations
A4:0 Frost protection active
A4:1 No frost protection. Adjustment only possible if param-
eter "A3:-9" has been set.
Note
Observe "Please note" for parameter "A3"
Explanations
A5:5 Economy function outside temperature: Heating circuit
pump "OFF" when the outside temperature (OT) is
1 K higher than the set room temperature (RT
OT RT + 1 K
>
set
A5:0 No economy function outside temperature
A5:1 to With economy function outside temperature: Heating
A5:15 circuit pump "OFF"; see the following table:
Parameter level 2
Heating circuit pump
"ON" "OFF"
-10 °C -8 °C
-9 °C -7 °C
-8 °C -6 °C
-7 °C -5 °C
-6 °C -4 °C
-5 °C -3 °C
-4 °C -2 °C
-3 °C -1 °C
-2 °C 0 °C
-1 °C 1 °C
0 °C 2 °C
1 °C 3 °C
to to
14 °C 16 °C
)
set
75