Viessmann Vitodens 242-F Installation And Service Instructions Manual page 73

"Heating circuit ..."
Parameter address With heating circuit pump logic function:
b5:...
Heating circuit pump "OFF"
5 RT
6 RT
7 RT
8 RT
Coding in the delivered condition
Min. flow temperature heating circuit
C5:20 Electronic minimum flow tempera-
ture limit 20 °C (only for operation
with standard room temperature)
Max. flow temperature heating circuit
C6:74 Electronic maximum flow tempera-
ture limit set to 74 °C
Heating program changeover
d5:0 With external heating program
changeover (observe setting for
coding addresses "3A", "3b" and
"3C" in the "General" group).
Heating program switches to "Con-
stant central heating with reduced
room temperature" or "Standby
mode" (subject to the value selec-
ted for the set reduced room tem-
perature).
Ext. heating program changeover to heating circuit
d8:0 With EA1 extension:
No operating program changeover.
Max. pump speed in standard mode
E6:... Only for heating systems without a
heating circuit with mixer:
Maximum speed of the internal
speed-controlled heating circuit
pump in % of the max. speed in
standard mode. Value is specified
by boiler-specific parameters (only
for weather-compensated control
units).
Min. pump speed
E7:30 Only for heating systems without a
heating circuit with mixer:
Minimum speed of the internal
speed-controlled heating circuit
pump:
30 % of the max. speed (only for
weather-compensated control
units)
(cont.)
RT + 1 K
>
actual set
RT
>
actual set
RT 1 K
> –
actual set
RT 2 K
> –
actual set
Heating circuit pump "ON"
RT < RT
actual set
RT < RT
actual set
RT < RT
actual set
RT < RT
actual set
Possible change
C5:1 Minimum limit adjustable from 1 to
to 127 °C (limited by boiler-specific pa-
C5:127 rameters)
C6:10 Maximum limit adjustable from 10 to
to 127 °C (limited by boiler-specific pa-
C6:127 rameters)
d5:1 Heating program switches to "Con-
stant operation with standard room
temperature".
d8:1 Operating program changeover via
input DE1.
d8:2 Operating program changeover via
input DE2.
d8:3 Operating program changeover via
input DE3.
E6:0 Maximum speed adjustable from 0
to to 100 %
E6:100
E7:0 Minimum speed adjustable from 0 to
to 100 % of the maximum speed
E7:100
Code 1
1 K
–
2 K
–
3 K
–
73