Viessmann Vitoladens 300-C Installation And Service Instructions Manual page 53

Adjusting the heating curves
Note
If the heating system includes heating circuits with
mixer, then the flow temperature of the heating circuit
without mixer is higher by a selected differential (8 K in
the delivered condition) than the flow temperature of
the heating circuits with mixer.
The differential temperature can be changed in coding
address "9F".
90
80
70
60
50
40
30
10
Fig. 50
Example for outside temperature
Underfloor heating system, slope 0.2 to 0.8
A
Low temperature heating system, slope 0.8 to 1.6
B
Heating system with a boiler water temperature in
C
excess of 75 °C, slope 1.6 to 2.0
Changing the slope and level
90
3.5
A
+20
Outside temperature in °C
Fig. 51
A Changing the slope
Changing the level (vertical parallel offset of the
B
heating curve)
(cont.)
Slope
0 -10 -20
-14
Outside temperature in °C
14 °C:
−
1.4
B
0.2
-20
Commissioning, inspection, maintenance
Factory settings:
■ Slope = 1.4
■ Level = 0
1.4
C
1.2
1.0
B
0.8
0.6
0.4
A
0.2
-30
Extended menu
1.
å
2. "Heating"
3. Select a heating circuit.
4. "Heating curve"
5. "Slope" or "Level"
6. Adjust the heating curve according to the system
requirements.
53