Samson 5100, 5179 operating instructions Gradient characteristic, 5.2.2 4-pointcharacteristic

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:

￿Old building, radiator design 90/70:		Gradient approx. 1.8
￿New building, radiator design 70/55:		Gradient approx. 1.4
￿New building, radiator design 55/45:		Gradient approx. 1.0
￿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.

40EB 5179 EN