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Best schedule for condensing boilers

Posted: 03 Feb 2016, 10:25
by paolov77
hi all,

I have a condensing boiler attached to the Netatmo Thermostat.

I'm trying to find the perfect schedule for my thermostat. A condensing boiler is efficient if it condenses, while if it reaches the target temperature begins a ON/OFF mode, that it's better to avoid.

I think that the best program would be a sort of conditioned if - e.g:

[*] if the indoor temperature is less that X, thermostat target temperature increases to Y
[*] when the target temperature Y is reached, new thermostat temperature is set to X


In this way the boiler would always be in the best working mode.

What do you think about that? Is it possible to imagine an advanced schedule program like my example?

Re: Best schedule for condensing boilers

Posted: 03 Feb 2016, 11:53
by willoz88
I think you should obtain what are you lookin for by disable the PID function and return to hysteresis mode, but i don't remember if the hysteresis level could be modified..

Re: Best schedule for condensing boilers

Posted: 03 Feb 2016, 12:19
by paolov77
Great advice...do you know if there is a suggested threshold for condensing boilers?

Re: Best schedule for condensing boilers

Posted: 03 Feb 2016, 16:17
by JanMetDePet
Modulating system????

Re: Best schedule for condensing boilers

Posted: 04 Feb 2016, 10:56
by paolov77
Uhm...modulating what?

Re: Best schedule for condensing boilers

Posted: 04 Feb 2016, 16:52
by JanMetDePet
No on/off situation for the boiler: Simple: "the thermostat tells the boiler: hold on, first look at results." Advanced: the thermostat sees what is the reaction on heating and regulates it's demand to the boiler. It will result in a much more flat temprature, which will save you energy, because at the "overshoot" in temp you will like it, but when the temp drops and finally the boiler starts heating up again (creating a new overshoot) your expirience is "cold" and turn up the requested temp.

Re: Best schedule for condensing boilers

Posted: 15 Feb 2016, 10:33
by willoz88
Netatmo does not support modulation.
paolov77 wrote:Great advice...do you know if there is a suggested threshold for condensing boilers?
It's my suggestion to keep the advanced mode (PID) and adjust the minimum heat time, mine is 6 minutes, but you must test
this function and adjust this value according to your house and boiler characteristics.

Otherwise you should come back to histeresys mode and adjust the value to your needs, there's no an absolute rule.
also in this case you must test and adjust the value for a training period to obtain your desired confort; but remember, higer values
results in greath fluctuating house temperature and may be very disconfortable.

The choice is yours...

Re: Best schedule for condensing boilers

Posted: 15 Feb 2016, 15:03
by naevus
Hello Paolo (my name too...): I have a Vaillant condensing boiler with a probe linked to it. The probe tunes the water temperature between 40 and 50 °C, based on temperature outside.

I set 17 °C when in the night and when I am away, 19 when I am at home. no prediction, but PID mode with minimum heating time set to the max available (7 minutes). hope it helps