What is the thermostat hysteresis of the Heat Controller?

[ArjenvM2 4]

What type of hysteresis curve does the Heat Controller thermostat follow?

 

See attached picture with 3 possible types, in which the Temperature is on the X-axis and the thermostat valve position on the Y-axis (100% is fully open, 0% is fully closed).

Figure 1 is with both for opening and closing independend curves of the valve position and with hysteresis in the temperature switch points

Figure 2 is a thermostat in which the valve is either fully open or fully closed with hysteresis.

Figure 3 is the same as Figure 1, but without hysteresis in the temperature swich points.

 

What would be the corresponding switching temperature (T1 & T2, or T1a, T1b, T2a, T2b) the Heat Controller is using if, for instance, the room is set to 20 degrees centigrade?

 

Please login or register to see this attachment.

[Staszek.S 6]

Hi Fibaro - this would be great if you can respond to this question ?

It would be much easier to maintain and understand what FGT heads are doing, if we know how they should operate - what to expect.

For example - in one of my rooms I have temperature set to 19', right now temperature reported is 19,8, and the head still reports 'required heat YES' - and I have no idea if something is wrong? Or is it still within hysteresis limits ?

Edited December 13, 2022 by Staszek.S

[SHARAN 2]

+1

This is an important question from ArjenvM2 that I hope Fibaro can answer in a proper way!

[Dzejms 0]

+1

[Neo Andersson 142]

Any Fibaro developer would be that kind and answer this?

There are no indications in device JSON about any hysteresis values, but there must be something, as Fibaro radiator head does not open imediatelly if the temperature is below the desired setpoint.

The question is, what is that value, and how does this work.