Viessmann VITOCROSSAL Service Instructions Manual page 32

Commissioning, inspection, maintenance
Adjusting heating curves
90
80
70
60
50
40
30
10
Fig. 23
Slope setting ranges:
■ Underfloor heating systems: 0.2 to 0.8
■ Low temperature heating systems: 0.8 to 1.6
Selecting the set room temperature
Individually adjustable for each heating circuit.
The heating curve is offset along the set room temper-
ature axis. With the heating circuit pump logic function
active, the curve modifies the start and stop character-
istics of the heating circuit pump.
Standard set room temperature
90
A
C
B
D
Fig. 24 Example 1: Adjustment of the standard set
room temperature from 20 to 26 °C
Boiler water temperature or flow temperature in °C
A
Outside temperature in °C
B
Set room temperature in °C
C
Heating circuit pump "OFF"
D
Heating circuit pump "ON"
E
Changing the standard set room temperature
Operating instructions
32
(cont.)
Slope
5 0 -5 -10 -15 -20
Outside temperature in °C
-20
E
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-25 -30
Reduced set room temperature
90
A
C
B
D
Fig. 25 Example 2: Adjustment of the reduced set
room temperature from 5 °C to 14 °C
Boiler water temperature or flow temperature in °C
A
Outside temperature in °C
B
Set room temperature in °C
C
Heating circuit pump "OFF"
D
Heating circuit pump "ON"
E
Changing the reduced set room temperature
Operating instructions
Changing the slope and level
Individually adjustable for each heating circuit.
-20
E