Viessmann VITODENS 333 Service Instructions Manual page 54

Coding
Code 2
(cont.)
Coding in Function mode
the as
delivered
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 unit.
54
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
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.
Without heating circuit
pump logic function
With heating circuit pump
logic function: Heating
circuit pump OFF, if (see
the following table)