Setting the correct temperature and controlling central heating

[ihormelnyk]

Setting the correct temperature and controlling central heating

[shimopus]

Hi @Tommrodrigues

Let me answer some questions as I was spent some time to investigate.

During the summer, how do I turn off the central heating whilst retaining hot water?

The only way which is working for me is set the Temperature to less then 40 degrees by Celcium - as it is lowest threshold for my boiler.

What exactly is boiler cooling?

As this protocol is a general one for a huge amount of different type of "boilers" this thing will work only for that ones which is supporting heating and cooling. So the answer - yes, your boiler doesn't support cooling.

if I would like to set the house temperature to 23 C for example, how do I control the boiler in such a way

This is a simple PID-controller implementation with predefined coefficients. For more information please read https://en.wikipedia.org/wiki/PID_controller

P.S. Did you try this library on NodeMCU? Which firmware did you use?

[phenotypic]

@shimopus Thank you so much for your reply,

That's clarified a lot for me. Makes sense that setting the temperature below a threshhold will 'turn off' the central heating. This shouldn't affect tap water temperature should it?

The PID controller makes sense, I'll look at his code again and see how I can adapt it for my case.

I suppose the only question I have remaining is what exactly are the enableCentralHeating, enableHotWater, enableCooling functions for? Are they just to retain connection with the boiler and don't play any real role?

As for which firmware I used, I'm unsure exactly what you mean. I flashed the NodeMCU with the Arduino IDE at the newest board version etc.

Thank you once again for your help,

Kind regards, Tom

[shimopus]

@Tommrodrigues you've said

This shouldn't affect tap water temperature should it?

If you'll change only the heating temperature that the answer is not it will not change the hot water temperature settings.

[ihormelnyk]

Hi @Tommrodrigues ,
My boiler Buderus Logamax u072-24k supports only central heating control.
And setBoilerStatus with enableCentralHeating = false turns off central heating.

[phenotypic]

@ihormelnyk @shimopus Strangely, it seems that setBoilerStatus with enableCentralHeating = false doesn't turn off my central heating; however, as suggested, setting the temperature to 0 does this. Furthermore, even with the temperature set to 0, the hot water (taps) seem to work as expected thankfully. Thank you once again for your help, I'll be sure to carry on fiddling with the library!

Kind regards, Tom