Optimising ecodan ASHP

hotheat · 2023-12-02T12:35:55Z

Hi, I am trying to optimise my installation and have learnt a lot in the past few days but still have some significant gaps in my knowledge! I have an 11.2kw ecodan hearing all rads to a 4 bed detached home. I had been controlling by third party thermostat with overnight set back, but a few days ago switched to weather compensation (and turned off the overnight setback last night as it was so cold…but that was expensive! So will leave it on in normal times). it’s set to 42/-4, 32/15. No science behind this I took a guess but it seems right at maintaining the thermostat downstairs at 20 so far. Upstairs a bit cold in this cold weather, otherwise ok. I finally set up the WiFi unit yesterday (a year later…) so finally have some data! There doesn’t seem to be much difference between flow and return temps. See pic below. my questions are: (sorry there’s a few, I will take as many or as few answers as I can get!) 1. should I be trying to increase this delta and if so how do I do that? 2. WC seems to increase comfort but doesn’t decrease energy consumption - does that sound right? At the moment tends to be drawing about 2kw at any given time usually. Sometimes this falls and I don’t know why… 3. Is the fall in flow temp likely a defrost cycle? This seems to have happened hourly today, it is cold so seems right? 4. How do I know if my heat pump is cycling? 5. I can’t get data on consumption/delivery as the app says no consumption meter fitted. There is an sd card in there which I thought was saving that data. Any idea on how I can get this or is it a lost cause? 6. I understand moving the curve at the -4 end, but not at the 15c end - any tips? Or do I just wait and see as it gets warmer? thank you!

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Air Source Heat Pumps (ASHPs)

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Gary

(@gary)

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08/12/2023 9:13 pm

I think I’ve said it before but mine will cycle anything below 32C. The difference between flow temp and house temp is too small and your emitters can’t lose the heat the smaller that gap the more cycling you will get.

im using a similar amount 30-40 at milder temps 40-50 at sub zero

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hotheat

(@hotheat)

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Topic starter 08/12/2023 9:19 pm

@gary thanks Gary, yes I saw that you said that before which is what made me wonder. Your explanation makes sense - I will keep an eye on it then to make sure it’s sticking to a max of a couple of cycles an hour, and probably leave it at 30.

That’s reassuring! Had a monster day of 70kwh last Saturday but it was v cold all day, lots of chores as it was Saturday and I didn’t set back overnight because it was so cold (don’t know if this is right approach or not but I didn’t want to risk getting into a death spiral)

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