Mitsubishi Ecodan - issues with flow/return difference and fluctuation

Salilah1173 · 2023-01-24T19:39:30Z

Asking for advice, before I speak (again) to our installers (!) We have Mitsubishi Ecodan 8.5 air source heat pump - currently not really performing well (they fixed a hardware issue a few days ago). My current worries are a) we can't seem to get to temperature above 19.8, with underfloor heating on all the time, and upstairs radiators set at 18C (they are fine, the upstairs temp is above 18) b) we are seeing flow temperature and return temperature tracking nearly exactly - most of the time - no more than 2 degrees difference and most of the time less - I thought the differential should be more? c) significant fluctuations for flow (and of course return) temperatures for a 24 hour period e.g. 19:00 last night %£c, 20:00 43, 21:00 50C, 22:00 54.4, 23:00 54.8, 24:00 50C, Same at 01:00, 03:00 down to 43C, 04:00 back up to 54C and so on! The hot water comes on at 01:00 to 03:00 so that makes sense, but we are seeing jumps 4:00 at 53.4, 5:00 at 48, 06:00 back to 54, 07:00 down to 48, 08:00 back up to 53, and so it continues. Is this "wrong"? Any ideas what it might be? Any thoughts much appreciated - I'll be calling the installers out, but would really like to know more of what I should be seeing as performance! thanks lotsSali

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Morgan

(@morgan)

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27/01/2023 11:12 am

@chickenbig looking at that it appears to concentrate on and used entirely for close up inspection of components and machinery etc as opposed to the outside of the building in full.

Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
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ChickenBig

(@chickenbig)

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27/01/2023 11:29 am

@morgan I found it to work OK outdoors (taking a few steps backwards), although the temperature range selection was a tad annoying if you got any clear (cold) sky in the picture.

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william1066

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27/01/2023 3:32 pm

@morgan

Posted by: @morgan

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is there such a thing as a cheap thermal camera?

Depends what you call cheap, but for about £75 - search "MLX90640 2.8" Thermal Imager" on ebay. I have not tried them, but it may do the job. Of course, "only the rich can afford to buy cheap".

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