Samson 5476 manual Gradient characteristic, Functions of the heating circuit

Functions of the heating circuit

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 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

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