First experiences, how does it actually work?

CsGezaCsGeza
edited October 2019 in Technical Questions

Hi,

I'm new in tado. Yesterday I have installed V3 Thermostat with Extension kit.

I have floor heating in living room and radiator heating in other rooms. I need very small switching hysteresis because the thermostat in living room and floor heating is very slowly.

I have different feelings after the first night with tado.

Setpoint was 22°C. It was still heating over 22°C, at 22.4 I have changed setpoint to 21.5°C then stopped.

I didn't find any specifications, what is the switching range? Me would be the 0.1°C perfect.

Setpoint 22C then heat on 21.9, heat off 22 (or 22.1). Is it possible with tado?

What does heating icon mean, one-two-tree heat-line?


Thanks for your help.

Best Answer

Answers

  • VertigoVertigo ✭✭✭

    I cant help with your questions (fellow newbie here) but can I ask first, is that a iOS screenshot? On my android app I cant select a time on the graph to read the exact value like in your screenshot, which is annoying as the Y axis has only 2 horizontal division lines (17C and 20C in the one im looking at) and I just have to guess what the temperature was.

    But like you, IIm also interested in understanding the "heating power". I see in openhab it varies between 0 and 100%, but my boiler only supports on/off, and I cant figure out when it actually turns on or off. Just now heating power was at 24% and the boiler ran for a bit.

    I will say tado does appear to do a good job maintaining temperatures in my setup, preemptively stopping heating when the radiators are hot and getting pretty close to its target most of the time. I think it learns how your heating system works to prevent over/undershoots so perhaps you should give it some time to learn your system?

  • Thanks for your answer. ;)

    Yes, it's on iOS.

    Couldn't you touch area of chart and slide your finger left or right? On iOS es works in this way.

    Yes, maybe need it more time to learn my heating system...?

  • VertigoVertigo ✭✭✭

    PID loop doesnt explain the heater is still on when the target temperature is already exceeded. That would require a negative P value :)

  • In this way, I can hardly imagine how could be this thermostat more efficient if would heats only to 22.1C at 22C setpoint instead of 22.6C...?

    Saving money was my last wish, but the comfort would be the first. But it is not comfortable 21.8-22.6 by a floorheating. :(

    Maybe we have to say goodbye..? :/

  • Well, it depends what parameters they are using; generally you get an overshoot unless finely tuned
  • VertigoVertigo ✭✭✭

    CsGeza, contact tado support via email. They have access to all the logs and they understand their own fuzzy logic, they should be able to help and either explain what happened or fix it.

    jacoscar, overshoots in achieving the target can obviously happen, if too much power is applied for too long trying to reach the target, but in this case, power was still being applied after the target temperature had already been reached. It wasnt just residual heat from his floor causing the overshoot, his boiler was still being fired. That makes no sense and is not a PID tuning problem. No matter how badly you tune the loop or what values you use for P, I and D, at the very latest the moment you overshoot your target, the calculated power requirement should change sign. In practice its always long before if I and D are not zero, so residual heat can get you to the target. But never ever long after you overshot it.

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