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Function
WE Configuration
Outdoor temperature – Current input OFF FB18 = ON
0: 0 to 20 mA = –20 to 50 °C
4: 4 to 20 mA = –20 to 50 °C
5.1.1 Gradient characteristic
Basically, the following rule applies: a decrease in the outdoor temperature causes the flow tem
-
perature to increase. By varying the
Gradient
and
Level
parameters, you can adapt the charac
-
teristic to your individual requirements. Increasing
Gradient
results in a higher flow tempera
-
ture, decreasing
Gradient
in a lower flow temperature. The
Level
parameter performs a parallel
transport of the heating characteristic in an upward or downward direction.
Outside the times-of-use, reduced set points are used for control:
Reduced flow set point
= Flow set point
–
Set-back difference
.
The
Max. flow temperature
and
Min. flow temperature
parameters mark the upperand lower lim-
its of the flow temperature. A separate gradient characteristic can be selected for the limitation
of the return flow temperature.
Examples for adjusting the characteristic:
4
Old building, radiator design 90/70: Gradient approx. 1.8
4
New building, radiator design 70/55: Gradient approx. 1.4
4
New building, radiator design 55/45: Gradient approx. 1.0
4
Underfloor heating depending on arrangement: Gradient smaller 0.5
Function
WE Configuration
Characteristics OFF FB19 = OFF
Parameters
WE WE* Range of values
Gradient, flow 1.8 0.8 0.2 to 3.2
Level, flow 0 °C –5 °C –30 to 30 °C
Set-back difference 15 °C 5 °C 0 to 50 °C
Min. flow temperature 20 °C 20 °C 20 to 130 °C
Max. flow temperature 90 °C 50 °C 20 to 130 °C
* Default setting applies to system Anl 9, floor heating
EB 5476 EN 41
Functions of the heating circuit