Hello
My setup:
ATAG iC Economiser Plus27 combi. (installed Sept 2018)
Evohome & OpenTherm Bridge
HR92 rad valves in 5 zones. Plenty of bypass rads.
Nodo-Shop OpenTherrm Gateway
Home-Assistant monitoring all of the above, running on RaspiPi
All works pretty well, bar some fun with the DHW ECO mode - solved now & probably best saved for another thread.
I have a question regarding the Evohome implementation of OpenTherm. The graph below shows OpenTherm Setpoint against time, as an output from the OpenTherm Gateway, placed between the Opentherm Bridge & boiler. Apologies, the picture looks rather small in the preview. I think you can click for a larger view. There is no DHW demand on the boiler at this time.
evo.jpg
I've noticed that at times of reducing/reduced CH demand Evohome steps the setpoint down to 10deg and then after ~1 mins steps it back up to the reduced setpoint. Purple arrows in the graph above. This looks more like TPI control than OpenTherm. Has anyone else noticed this & could you comment on whether this is as expected, as designed or otherwise? This is before the 02.00.19.31 Beta firmware update btw.
Many thanks.
My setup:
ATAG iC Economiser Plus27 combi. (installed Sept 2018)
Evohome & OpenTherm Bridge
HR92 rad valves in 5 zones. Plenty of bypass rads.
Nodo-Shop OpenTherrm Gateway
Home-Assistant monitoring all of the above, running on RaspiPi
All works pretty well, bar some fun with the DHW ECO mode - solved now & probably best saved for another thread.
I have a question regarding the Evohome implementation of OpenTherm. The graph below shows OpenTherm Setpoint against time, as an output from the OpenTherm Gateway, placed between the Opentherm Bridge & boiler. Apologies, the picture looks rather small in the preview. I think you can click for a larger view. There is no DHW demand on the boiler at this time.
evo.jpg
I've noticed that at times of reducing/reduced CH demand Evohome steps the setpoint down to 10deg and then after ~1 mins steps it back up to the reduced setpoint. Purple arrows in the graph above. This looks more like TPI control than OpenTherm. Has anyone else noticed this & could you comment on whether this is as expected, as designed or otherwise? This is before the 02.00.19.31 Beta firmware update btw.
Many thanks.
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