Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 105

"Heating circuit ..."/group 5
Coding in the delivered condition
No room temperature-de-
pendent heating circuit
pump logic function (only
for weather-compensa-
ted control units)
Parameter ad- With heating circuit pump logic function:
dress b5:... Heating circuit pump "OFF"
1 RT
2 RT
3 RT
4 RT
5 RT
6 RT
7 RT
8 RT
Coding in the delivered condition
C5:20 Electronic minimum flow
temperature limit 20 °C
(only in operation with
standard room tempera-
ture; only for weather-
compensated control
units)
C6:74 Electronic maximum flow
temperature limit 74 °C
(only for weather-com-
pensated control units)
d3:14 Heating curve slope =
1.4
d4:0 Heating curve level = 0
(cont.)
> RT + 5 K
actual set
> RT + 4 K
actual set
> RT + 3 K
actual set
> RT + 2 K
actual set
> RT + 1 K
actual set
> RT
actual set
> RT – 1 K
actual set
> RT – 2 K
actual set
Possible change
Heating circuit pump "ON"
RT < RT
actual
RT < RT
actual
RT < RT
actual
RT < RT
actual
RT < RT
actual
RT < RT
actual
RT < RT
actual
RT < RT
actual
Possible change
C5:1 Minimum limit adjustable
to from 1 to 127 °C (limited by
C5:127 boiler-specific parameters)
C6:10 Maximum limit adjustable
to from 10 to 127 °C (limited
C6:127 by boiler-specific parame-
ters)
d3:2 Heating curve slope adjust-
to able from 0.2 to 3.5 (see
d3:35 page 70)
d4:–13 Heating curve level adjust-
to able from –13 to 40 (see
d4:40 page 70)
Code 2
+ 4 K
set
+ 3 K
set
+ 2 K
set
+ 1 K
set
set
– 1 K
set
– 2 K
set
– 3 K
set
105