Viessmann B2UA, Installation And Service Instructions Manual

Page: 114 / 200

114
Coding in the delivered condition Possible change
Heating mode/reduced
mode: Weather-compen-
sated b0:2 Heating mode: With room
temperature hook-up
Reduced mode: Weather-
compensated
b0:3 Heating mode/reduced
mode: With room tempera-
ture hook-up
b2:8 Only for heating circuit
with mixer and remote
control, and operation
with room temperature
hook-up must be pro-
grammed for the heating
circuit:
Room influence factor 8 b2:0 Without room influence
b2:1
to
b2:64 Room influence factor ad-
justable from 1 to 64. The
higher the value, the great-
er the room influence.
b5:0 Only for heating circuit
with mixer and remote
control:
Without room tempera-
ture-dependent heating
circuit pump logic func-
tion b5:1
to
b5:8 Heating circuit pump logic
function, see the following
table.
Parameter ad-
dress b5:... With heating circuit pump logic function:
Heating circuit pump "OFF"
Heating circuit pump "ON"
1 RT
actual
> RT
set
+ 5 K RT
actual
< RT
set
+ 4 K
2 RT
actual
> RT
set
+ 4 K RT
actual
< RT
set
+ 3 K
3 RT
actual
> RT
set
+ 3 K RT
actual
< RT
set
+ 2 K
4 RT
actual
> RT
set
+ 2 K RT
actual
< RT
set
+ 1 K
5 RT
actual
> RT
set
+ 1 K RT
actual
< RT
set
6 RT
actual
> RT
set
RT
actual
< RT
set
– 1 K
7 RT
actual
> RT
set
– 1 K RT
actual
< RT
set
– 2 K
8 RT
actual
> RT
set
– 2 K RT
actual
< RT
set
– 3 K
Coding in the delivered condition Possible change
C5:20 Electronic minimum flow
temperature limit 20 °C
(only in operation with
standard room tempera-
ture) C5:1
to Minimum limit adjustable
from 1 to 127 °C (limited by
boiler-specific parameters)
Code 2
"Heating circuit ..."
(cont.)
5773 238 GB