Viessmann C3TB, Installation And Service Instructions For Contractors

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96
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
Min. flow temperature, heating circuit
C5:20 Electronic minimum flow tempera-
ture limit 20 °C (only when operat-
ing at standard room temperature) C5:1
to
C5:127 Minimum limit adjustable from 1 to
127 °C (limited by boiler-specific pa-
rameters)
Max. heating circuit flow temperature
C6:74 Electronic maximum flow tempera-
ture limit set to 74 °C C6:10
to
C6:127 Maximum limit adjustable from 10 to
127 °C (limited by boiler-specific pa-
rameters)
Heating program - changeover
d5:0 With external heating program
changeover. Observe settings of
coding addresses "3A", "3b" and
"3C" in
"General" group.
Operating program switches to
"constant central heating with re-
duced room temperature" or
"standby mode" depending on the
setting of the reduced set room
temperature.
d5:1 Operating program switches to "con-
stant operation with standard room
temperature".
Ext. heating program changeover to heating circuit
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
d8:3 Operating program changeover via
input DE3
Max. pump speed in standard mode
E6:... Only for heating systems without a
heating circuit with mixer:
Max. speed of internal variable
speed heating circuit pump as % of
max. speed in standard mode. Val-
ue is specified by boiler-specific
parameters (only for weather-com-
pensated control unit). E6:0
to
E6:100 Maximum speed adjustable from 0
to 100 %
Codes
Coding level 1
(cont.)
5775 636 GB
Codes