Viessmann Vitodens 333 Service Instructions Manual page 52

Coding
Code 2
(cont.)
Coding in the delivered condition
Heating circuit A1/M2
A4:0 With frost protection
(only for weather-com-
pensated control units)
A5:5 With heating circuit
pump logic function
(economy circuit): Heat-
ing circuit pump "OFF"
when the outside tem-
perature (AT) is 1 K
higher than set room
temperature (RT
AT > RT
for weather-compen-
sated control units)
Parameter address
A5:...
1
2
3
4
5
6
7
to
15
52
Possible change
A4:1
A5:0
A5:1
to
A5:15
)
Set
+ 1 K (only
Set
With heating circuit pump logic function: Heating
circuit pump "OFF"
AT > RT + 5 K
Set
AT > RT + 4 K
Set
AT > RT + 3 K
Set
AT > RT + 2 K
Set
AT > RT + 1 K
Set
AT > RT
Set
AT > RT -v1 K
Set
AT > RT - 9 K
Set
No frost protection; this
setting is only possible if
code "A3:-9" has been
selected.
Note
Observe the note for
code "A3".
Without heating circuit
pump logic function
With heating circuit pump
logic function: Heating
circuit pump "OFF" (see
the following table)