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ASHP Install from hell - help please

saf1973 · 2022-01-24T17:47:22Z

Where do I start, well its taken 14 months for my installer (who shall remain nameless for now due to on-going issues) to get this far, a couple of months ago they left me in this state with the Daikin 16KW set on 50C (which I lowered after a huge bill) and said they would come back to finish the DHW. The installer is a very large UK-wide company whom said they had done thousands of installs, yet they couldn't work out how to commission the DHW! That included a visit from a Daikin engineer who also seemed clueless. Anyway, they have let me down 3 times in the last two months on cancellations due to "Covid" etc (easy excuse nowadays) but I want to be able to fire a list of what is wrong to them as a final chance. The good thing is that I have only paid the 10% deposit and if they fail to get everything done including registering for RHI before which closes on 31/3 I wont be paying another penny. So here is the schematic which I drew up today, prompted by me noticing that there is a 5C drop from the HP flow before it even gets to the radiator circuit. Amazingly, the majority of the house is getting up to temperature but there are some undersized rads causing some issues (that's for another thread). I am new to ASHP, so I'm still learning about the theory, but here is what look wrong to me..... Please comment/correct me if I am wrong. 1) The BoilerMag filter is fitted to the flow from the HP and not after the last Radiator, with the HP being at the lowest point of the whole install I would assume it is currently filling up with gunk. 2) The Daikin backup heater EKMBUHCA plumbing seems to be reversed according to the install manual. 3) The buffer flow is incorrectly plumbed into the bottom and therefore HW is mixing with cold return from the Rads and DHW, thus causing temp loss before it gets to the Rads. 3a) It actually looks like there is a return loop that doesnt get back to the HP for heating, the accumulator is blending the water instead. i'm trying to find a schematic of how it should be done but not found one yet.

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Air Source Heat Pumps (ASHPs)

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saf1973

(@saf1973)

Estimable Member Member

Joined: 4 years ago

Posts: 59

Topic starter 17/08/2022 5:48 pm

So I get another email (two now) from Solartherm stating that the case is closed, then I get the NICEIC report which shows it far from closed!

Attached snippets from the report.

👍

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

17/08/2022 6:19 pm

@saf1973

At least the NICEIC Engineer appears to know what he is doing. I hope it leads to you getting all your problems resolved.

👍

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4476

19/06/2025 8:38 am

@saf1973 I’ve been going through old cases on the forums, and wanted to see if there’s been a resolution. Did you ever get a satisfactory outcome to your issues?

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