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Pump speed
Posted: Mon May 22, 2023 3:33 pm
by wintersteiger
Does anybody happen to know whether there is an OpenTherm data ID for the CH pump speed? It doesn't seem to be in the version 2.2 specification, but I would imagine that there is one in later revisions. I would like to see that just so I can tell when and for how long the pump is running.
Re: Pump speed
Posted: Mon May 22, 2023 9:58 pm
by hvxl
There is no Opentherm data ID defined for real-time information about the pump in newer versions of the Opentherm spec either. Probably that information is not considered relevant for a thermostat to be able to control the boiler.
The only data IDs that can give you some idea of when and how long the pump has been running are: ID117 (CH pump starts) and ID121 (CH pump operation hours).
Re: Pump speed
Posted: Tue May 23, 2023 2:13 pm
by wintersteiger
That's a good point - it probably is indeed irrelevant for a thermostat.