ESBE 90C-1 Série Mode D'emploi page 15

If the split mode is selected, the characteristic curve is adjusted in 3 steps. First the
standard slope has to be set, after that the split point and finally the steepness of the
curve after the split. While adjusting the curve the steepness of the slope and the
calculated reference flow temperature for -20 °C outdoor temperature is displayed.
Splited curve is often selected to compensate.
Settings range:
Characteristic curve : simple or split / Default: simple
Slope : 0.0...3.0 / Default: 0.8
Splitpoint at outdoor temp.: +10°C...-10°C
Angle: differs, depends on steepnes and split point
The diagram shows the influence of the selected characteristic curve steepness (stan-
dard curve) on the calculated reference flow temperature of the heating circuit. The
correct curve is appointed by setting the intersection point of the calculated maximum
flow temperature and the minimum outdoor temperature.
Maximum calculated flow temperature 60°C at minimum outdoor temperature according
to heat demand calculation -12°C.
The intersection results in a slope of 1.2.
Example 1: Simple
Characteristic curve
90
80
70
60
50
40
30
20
20
+15
+10
+5
+0 °C
−5
10 0 -10 -12 -20
Outdoor temperature ° C
Example 2: Split
Splitpoint 0° selected with
90
heating curve part 1 selected
80
to 1.0 and heating curve part
2 selected to 0.8 will increase
70
flow temp from 38° to 40° at
outdoor temp 0° compared to
60
simple heating curve 0.9
50
40
30
20
20
Example 3: Split
90
Splitpoint 0° selected with
heating curve part 1 selected
80
to 1.1 and heating curve part
2 selected to 0.7 will increase 70
flow temp from 38° to 42° at
60
outdoor temp 0° compared to
simple heating curve 0.9
50
40
30
20
20
Example 4: Max/Min Split
90
Splitpoint 0° selected with
heating curve part 1 selected
80
to 1.1 and heating curve part
2 selected to 0.7 will increase 70
flow temp from 38° to 42° at
60
outdoor temp 0° compared to
simple heating curve 0.9
50
Max limitation 50°C and min
limitation 25°C added.
40
30
20
20
Characteristic curve
+15
+10
+5
+0 °C
−5
10 0 -10 -12 -20
Outdoor temperature ° C
Characteristic curve
+15
+10
+5
+0 °C
−5
10 0 -10 -12 -20
Outdoor temperature ° C
Characteristic curve
+15
+10
+5
+0 °C
−5
10 0 -10 -12 -20
Outdoor temperature ° C
15