If by “Samsung controller” you mean the MWR-WW10N attached to your MIM-E03*N, then inverter frequency isn’t available there. I have a (borrowed) MIM-C02N wired into the F1/F2 terminals in the MIM-E03EN and this displays lots of information on my laptop about the Outdoor Unit’s operation (mainly refrigerant circuit temperatures and pressures and EEV/SOV positions but also including inverter frequency).
It may be that the OEM kit available from the site shop can access this data also (@glyn.hudson?).
But even if you haven’t got any monitoring equipment, it looks like you can still get inverter output (%) directly from the Outdoor Unit panel (press the K4 button 20 times, according the Installers Guide p167). The Guide can be downloaded from the Midsummer Wholesale website.
I’m getting confused with what my COP is as there seems to be a lot of different figures about but none very good at least to me—any suggestions to what I can tweak to improve things would be most welcome?
Could you post the MyHeatPump link to your data? Have you considered submitting this system to https://heatpumpmonitor.org/ ? That will make it easier to share the data with others and use the analytic tools built into the site.
Dear Sarah,
In my effort to have the gen7 completely monitored/controllable by MQTT, I’d like to collect that information. Would you know what message number is the inverter frequency encoded with?
Best regards,
Sorry @Topaz, I don’t communicate with the MIM-E03EN controller at code level - I simply plug the MIM-C02N into my PC and analyse the Excel spreadsheet data that the S-NET Pro2 software generates.
Don’t know if this might help you. They are Modbus registers but I believe the Modbus register number is directly related to the NASA equivalent … More Hidden Registers.odt (21.7 KB)
I know nothing about Modbus registers, but noticed the “Value seems off” against the 0x8217 entry in your odt file - something I too have worried about.
If I time plot HP thermal duty (W) (calculated from m.Cp.deltaT, shown in red) and “compressor current” (as reported by the MIM-C02N but multiplied by 1000 to show them on the same axes, shown in blue) I get:
I can see a fair correlation between them once duty has dropped below HP nameplate (8kW), but the earlier behaviour while the compressor inverter output was at or above 50Hz makes no sense, and I suspect that it isn’t actually compressor current being reported at all (not least because the units of compressor current are reported as “degC” rather than “amps”).
Sarah,
I must say your document is very interesting. I found many of them by reversing manually values read on the modbus line.
I’ll adjust the myehs wiki website to reflect the new registers your document uncovers.
Thanks a lot!
