Viessmann B2TF Installation And Service Instructions Manual page 106

Function description
Control functions
(cont.)
90
80
70
60
50
40
30
10
Fig. 57
Slope setting ranges:
■ Underfloor heating systems: 0.2 to 0.8
■ Low temperature heating systems: 0.8 to 1.6
Set room temperature
Standard room temperature or comfort room tem-
perature
Individually adjustable for each heating circuit.
The heating curve is offset along the set room temper-
ature axis. The start and stop points of the heating cir-
cuit pumps depend on the Heating limit... outside tem-
perature, heating circuit... setting.
90
A
C
B
D
Fig. 58 Example 1: Adjusting the set room tempera-
ture from 20 to 26 °C
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 set room temperature
Operating instructions
106
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 room temperature
90
A
C
B
D
Fig. 59 Example 2: Adjusting the reduced set room
temperature from 5 °C to 14 °C
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