I’ve got a 9kW Daikin system, installed by Octopus. With the help of members here, I’m monitoring it using ESPAltherma and a CT connected to a MyEnergi Eddi. The data is logged to Home Assistant and published to emoncms and heatpumpmonitor: https://heatpumpmonitor.org/system/view?id=120 The house …

My inclination would be to switch to pure LWT control, since the thermostat is not providing any useful input. You could then adjust the WC settings so that the house is the temp you want, without the added complexity of the ‘stat. Once that’s dialled in, maybe look at using the ‘stat if you need it…

If your rooms are too cold - and that is what you want to fix first - then running the heat pump for more hours of the day is a good start. From your screenshots, it’s clear the heat pump is pulling over 3kW in some one hour periods, so you could get 3 hours of minimum power operation for the same …

PS: @dmhom your SCOP of 3.23 isn’t too bad. My 9kW system has returned 3.30 since December 2023. John’s has delivered 3.35. But I firmly believe running the heat pump for more hours per day will deliver better efficiency and probably won’t use any more electricity, as the system will get into the l…

@John @squarepeg77 thank you for feedback most useful. @John I had the Level 3 Heat Pump Monitoring Bundle (emonHP) installed by Octopus. @John Can you clarify setting the system for LWT. If you switch the Madoka off I understood it turned the HP system off as it was wired through this. In the MM…

You can either set the Madoka as high as it will go, to a level it won’t get to, so it is effectively always on, or you can go to the MMI, put it in installer mode (5678) and set Setpoint Mode on main zone to LW only (not room or external room stat), and also Weather dependent. I don’t have the m…

Hi Derek @dmhom In my view, the 1st thing to do is to work on reducing the frequency of defrosts which is killing your CoP. It’s an unfortunate habit of the Daikins that they go hell for leather at the start of a cycle to get the flow temperature up to target and having the pump working hard at th…

there is also a maximum input setting in the mmi some where which can help

[image] dmajwool: 8.6.2 Defrost / Oil return off this is an information field. Not sure what it means. Reports as ON during a defrost

[image] dmajwool: It’s an unfortunate habit of the Daikins that they go hell for leather at the start of a cycle to get the flow temperature up to target and having the pump working hard at these times encourages the next lot of frost to form - and because the machine is not learning from its ex…

Performance of 9kW Daikin

Hardware Heatpump

meatballs (Ben) 8 February 2025 17:37 193

If pushing Madoka up make sure modulation is disabled…

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Tuning performance of Dakin 8kw Altherma 3