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If just one outdoor sensor should be connected, connect it to AF1. This outdoor temperature is
then used also for HK2 and HK3.
5.2.1 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 parameter
Level
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 upper and 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
Functions
WE Configuration
4-point characteristic OFF Co1, 2, 3 -> Fb10 = OFF
4-point characteristic OFF Co5 -> Fb03 = OFF (Anl 3, 5, 8 and 10)
Parameters
WE Parameter level / Range of values
Gradient, flow 1.8 PA1, 2, 3 / 0.4 to 3.2
Level, flow 0 °C PA1, 2, 3 / –30 to 30 °C
Set-back difference 20 °C PA1, 2, 3 / 0 to 50 °C
Min. flow temperature 90 °C PA1, 2, 3 / 20 to 130 °C
Max. flow temperature 20 °C PA1, 2, 3 / 20 to 130 °C
5.2.2 4-point characteristic
The 4-point characteristic allows you to define your own heating characteristic.
It is defined by 4 points for the
Outdoor temperature
, the
Flow temperature
and the
Return flow
temperature
. The
Set-back difference
at points 2 and 3 indicates how much the flow temperature
is reduced outside the times-of-use.
40 EB 5179 EN
Functions of the heating circuit