Hi,
What is the return temperature from the puffer, before the anti condensation valve ?
Hi Michael,
sorry for late reply but I was out for work last week and 've made some tests this weekend.
I've checked the dirty separator filter (
https://www.caleffi.com/italy/it/catalogo/dirtmagr-defangatore-con-magnete-corpo-tecnopolimero-545305) but it was ok, just some dirt at the bottom.
The return temperature before the VAC is always at the same T of the buffer bottom (usually 40°), when the buffer start becaming full it grows up of course.
I've made some tests with P and I:
P=12.5 and I=0.05 (my previous regulation): it was ok when hot request is average, the boiler always run very low. problem start when one or two circuits start asking hot water, this bring buffer T very low and the boiler never increases power.
P=5 and I=0.1, a little bit better, the average power is higher (30/40%) and so also the fuel consumption is better. I've edited the system schedule so it never start 2 or more circuit at the same time and this give me a lot better configuration. The problem start when I turn on a circuit with fan coil that ask for hot water. also in this case the buffer T goes down but the boiler run at the same (low) power.
Now I'm making some tests with P=5 and I=0.2, i'm thinking that I make the power very high and P start decreasing it it it is too much.
I'm increasly convinced that with my configuration with buffer the boiler must be driven by the buffer top temperature, but i'm hoping to be wrong and hoping find a good setup
thanks for your interest and help Michael!