Viessmann Vitodens 333 Service Instructions Manual page 53

Code 2
(cont.)
Coding in Function mode
the as de-
livered
condition
Address:
value
Boiler circuit, mixer circuit
A4:0 * 1 With frost protection
A5:5 * 1 With heating circuit
pump logic function
(economy circuit): Heat-
ing circuit pump OFF, if
the outside temperature
(AT) is 1 K higher than
the set room tempera-
ture (RT
AT > RT
Parameter address
A5:...
1
2
3
4
5
6
*1
Only for weather-compensated control units.
Coding
change
Address:
value
A4:1
A5:0
A5:1
to
A5:15
)
Set
+1 K
Set
With heating circuit pump logic function: Heating
circuit pump OFF, if
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
Coding
Possible change
No frost protection, ad-
justment only possible if
code A3: -9 has been se-
lected.
Note
When selecting a value
below 1 °C, there will be
a risk of pipes outside the
thermal insulation envel-
ope of the house freezing
up. The standby mode, in
particular, should be
observed, e.g. during
holidays.
Without heating circuit
pump logic function
With heating circuit pump
logic function: Heating
circuit pump OFF, if (see
the following table)
53