With my limited vision, I may be missing the finer details of your graphs but the ‘timings’ look very ‘mechanical’ as though despite your needs, the pump has a setting based on time rather than needs. I too have a Daikin with the MMI and the Onecta app is of little merit or use to me other than to report an approximation of consumption. Homely presides over the operation of my system so is not a direct comparison by any means but I am attaching a graph from the last 24 hours indicating OAT, IAT and pump cycles in case this is of any assistance. If you look at the list of available data and you notice any that you would like me to include, please ask. I tried to reduce the amount of values on any one chart for clarity - it looks rather busy otherwise!

Regards, Toodles.

@toodles   Thanks for the reply and data.  Mine does look very mechanical. I found a setting in the MMI for the Pump and it was as I thought set to "Sampling". I changed this at 14:00 to "Continuous" and have added an extra screenshot below.  It has flattened out the sampling cycles between the calls for heat and made it a little easier to see how the heat pulses have variable times of duration. My system is based purely on outside temperature and I presume this is what is affecting the pulse width.  I have plans to add external temperature measurement and also flow and return temperature measurement. I just need a little time to get up in to the loft to add the sensors.

My main concern was to try to establish that the Heat pump is working correctly and as the manufacturers, intended.  I think I have read that the pump is set to sampling to save costs.  I will leave it on continuous for 24 hours to evaluate what happens. 

I was very interested in Mars's video regarding heat pump monitoring, with Homely and the other contributors.

Could I take you up on your offer to supply another graph?

Could it include:  Inside Temperature, Outside Temperature and Estimated Power Input. (My Shelley device is just a current clamp with mains voltage sensing so it may help me to understand a little better.

Is the Homely device connected to your heat pump via an interface, which it can then access all the heat pump data in real time and adjust the settings of the heat pump to maximise comfort and minimise costs, based on your energy suppliers tariff?

Regards, pj_preston

@pj_preston The Homely smart controller is connected to the Daikin via the MMI and uses Modbus (they use a D.comm unit to accomplish this). If you read my review on RHH, it describes the control it provides but basically it takes over from the WC settings, compares temperatures OAT and IAT, monitors losses, weather, solar gain etc. and ‘micromanages’ the whole system. From installation, it takes a week or so to ‘learn’ your system and your needs then just gets on with the job. Regards, Toodles (graph as requested attached).