Viessmann Vitoladens 300-W Service Instructions For Contractors page 49

Code 2
(cont.)
Coding in the delivered condition
Boiler circuit, mixer circuit
A4:0 With frost protection
A5:5 With heating circuit pump
logic function (economy
circuit): Heating circuit
pump OFF if outside tem-
perature (AT) is 1 K
higher than the set room
temperature (RT
AT > RT
Parameter address
A5:...
1
2
3
4
5
6
7
to
15
)
set
+ 1 K
set
With heating circuit pump logic function: Heating cir-
cuit 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
AT > RT - 1 K
set
AT > RT - 9 K
set
Possible change
A4:1 No frost protection, adjust-
ment only possible if cod-
ing address "A3: -9" has
been selected.
Note
If a value is selected below
1 °C, there is a risk of pipes
outside the thermal enve-
lope of the building freezing
up. The standby mode, in
particular, should be taken
into consideration, e.g. dur-
ing holidays.
A5:0 Without heating circuit
pump logic function
A5:1 With heating circuit pump
to logic function: Heating cir-
A5:15 cuit pump OFF, if (see the
following table)
Codes
49