Viessmann VITODENS 200-W Service Instructions Manual page 49

Code 2
(cont.)
Coding in the delivered condition
Boiler circuit, mixer circuit
A4:0 With frost protection (only
for weather-compensa-
ted control units)
A5:5 With heating circuit pump
logic function (economy
circuit): Heating circuit
pump "OFF" when the
outside temperature (AT)
is 1 K higher than set
room temperature (RT
AT > RT
weather-compensated
control units)
Parameter address
A5:...
1
2
3
4
5
6
7
to
15
Possible change
A4:1
A5:0
A5:1
to
A5:15
)
set
+ 1 K (only for
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
Codes
No frost protection, adjust-
ment only possible if cod-
ing address "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 cir-
cuit pump "OFF", if (see the
following table)
49