Gradient Characteristic - Samson TROVIS 5474 Mounting And Operating Instructions

System-wide functions

8.1.1 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 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:
4
New building, radiator design 70/55:
4
New building, radiator design 55/45:
4
Underfloor heating depending on arrangement: Gradient smaller 0.5
Functions
Type of characteristic
Type of characteristic for separate/direct
heating circuit*
Parameters
Gradient, flow
Level, flow
Set-back difference
Max. flow temperature
Min. flow temperature
50
EB 5474 EN
Gradient approx. 1.8
Gradient approx. 1.4
Gradient approx. 1.0
WE Configuration
OFF Co5 -> Fb03 = ON, select: 2
ON Co2, Co3 -> Fb10 = ON, select: 2*
* Only in systems Anl 1 to 3 with Co5 -> Fb13 = ON
WE Parameter level / Range of values
1.8 PA2*, PA3*, PA5 / 0.4 to 3.2
0 °C PA2*, PA3*, PA5 / –30 to 30 °C
15 °C PA2*, PA3*, PA5 / 0 to 30 °C
90 °C PA2*, PA3* / 20 to 160 °C
20 °C PA2*, PA3* / 20 to 120 °C
* Only in systems Anl 1 to 3 with Co5 -> Fb13 = ON