Viessmann Vitodens 200-W B2HE Installation And Service Instructions Manual page 108

Function description
Appliance functions
Note
If heating circuits with mixer are present in the heating
system: The flow temperature of the heat generator is
one differential temperature higher than the flow tem-
perature for the heating circuits with mixer. Differential
temperature in delivered condition set to 8 K.
The differential temperature can be adjusted using the
following parameters:
■ Heating circuit 2: Parameter 934.5
■ Heating circuit 3: Parameter 935.5
■ Heating circuit 4 (if installed): Parameter 936.5
90
80
70
60
50
40
30
10
Fig. 58
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.
108
(cont.)
Slope
5 0 -5 -10 -15 -20
Outside temperature in °C
1.4
1.2
1.0
0.8
0.6
0.4
0.2
-25 -30
90
A
C
D
Fig. 59 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
E Heating circuit pump "On"
Changing the set room temperature
Operating instructions
-20
B
E