Gradient Characteristic; 4-Point Characteristic - Samson TROVIS 5179 Mounting And Operating Instructions

Functions of the heating circuit
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:
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

4-point characteristic

4-point characteristic
Parameters
Gradient, flow
Level, flow
Set-back difference
Min. flow temperature
Max. flow temperature
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
Gradient approx. 1.8
Gradient approx. 1.4
Gradient approx. 1.0
WE Configuration
OFF Co1, 2, 3 -> Fb10 = OFF
OFF Co5 -> Fb03 = OFF (Anl 3, 5, 8 and 10)
WE Parameter level / Range of values
1.8 PA1, 2, 3 / 0.4 to 3.2
0 °C PA1, 2, 3 / –30 to 30 °C
20 °C PA1, 2, 3 / 0 to 50 °C
90 °C PA1, 2, 3 / 20 to 130 °C
20 °C PA1, 2, 3 / 20 to 130 °C