Viessmann B2TA, Installation And Service Instructions For Contractors

Page: 72 / 144

72
Parameter address
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 tempera-
ture limit 20 °C (only in operation
with standard room temperature;
only for weather-compensated
control units) C5:1
to
C5:127 Minimum limit adjustable from 1 to
127 °C (limited by boiler-specific pa-
rameters)
C6:74 Electronic maximum flow tempera-
ture limit 74 °C (only for weather-
compensated control units) C6:10
to
C6:127 Maximum limit adjustable from 10 to
127 °C (limited by boiler-specific pa-
rameters)
d3:14 Heating curve slope = 1.4 d3:2
to
d3:35 Heating curve slope adjustable from
0.2 to 3.5 (see page 51)
d4:0 Heating curve level = 0 d4:–13
to
d4:40 Heating curve level adjustable from
–
13 to 40 (see page 51)
d5:0 With external heating program
changeover (observe setting for
coding addresses "3A", "3b" and
"3C" in the
"General" group).
Operating program switches to
"Constant central heating with re-
duced room temperature" or
"Standby mode" (subject to the
settings of the set reduced room
temperature) (only for weather-
compensated control units).
d5:1 Heating program switches to "Con-
stant operation with standard room
temperature".
d6:0 Heating circuit pump stays in con-
trol mode at signal "External block-
ing" d6:1 Heating circuit pump stops at "Exter-
nal blocking" signal (subject to cod-
ing addresses "3A", "3b" and "3C")
d6:2 Heating circuit pump starts at "Exter-
nal blocking" signal (subject to cod-
ing addresses "3A", "3b" and "3C")
d7:0 Heating circuit pump stays in con-
trol mode at signal "External de-
mand" d7:1 Heating circuit pump stops at "Exter-
nal demand" signal (subject to cod-
ing addresses "3A", "3b" and "3C")
d7:2 Heating circuit pump starts at "Exter-
nal demand" signal (subject to cod-
ing addresses "3A", "3b" and "3C")
d8:0 With EA1 extension:
No operating program changeover. d8:1 Operating program changeover via
input DE1.
d8:2 Operating program changeover via
input DE2.
Codes
Coding level 2
(cont.)
5773 216 GB
Codes