Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 178

Function description
Control functions
(cont.)
The heating curve characteristics determine the set
flow temperature subject to outside temperature. The
control unit regulates in line with an average outside
temperature. This is made up of the actual and the
adjusted outside temperature.
Example using the settings in the delivered condition
90
80
70
60
50
40
30
Fig. 107
Heating curve for operation with standard room
A
temperature
Heating curve for operation with reduced room
B
temperature
Room temperature
In conjunction with the remote control and room tem-
perature hook-up (coding address "B0"):
Compared to the outside temperature, the room tem-
perature has a greater influence on the set flow tem-
perature (change via coding address "B2").
DHW temperature
The priority control of the cylinder heating can be
adjusted individually for each heating circuit. Adjust-
ment via code A2, Heating group, for each heating cir-
cuit. This is used to determine which heating circuit is
affected by priority control during cylinder heating.
178
10 5 0 -5 -10
Outside temperature in °C
A
B
-15 -20
■ With priority control:
During cylinder heating, the set flow temperature of
the relevant heating circuits is set to 0 °C.
The mixer closes. The heating circuit pump is
switched off.
■ Without priority control:
The heating circuit pump continues to operate with
the same set value.
With reduced priority control:
■
During cylinder heating, the set flow temperature of
the relevant heating circuits is set to the set value of
reduced heating mode.
Heating circuit pump logic (economy mode)
The heating circuit pump is switched off (set flow tem-
perature set to 0 °C) when the outside temperature
exceeds the value selected via coding address "A5".