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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 15, 2025
Profile Activity
Topics: 17 / Replies: 2851
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RE: Thinking of ripping our my IVT Greenline HT Plus C model and replacing with a gas boiler.

Do you know what the alarm means. From what you 'have been told' it sounds like a 'low flow' alarm. If it wasnt there initially then something ...

8 months ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

As a former local government employee (following a career in engineering) I realised that explaining the consequences to politicians simply and in ter...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP and how it should run and potential kw consumption?

I am planning on trialling night time 'set forward' to take advantage of cheap rate tarrif. I have no idea if it will work in practice. The challeng...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

Thanks for that, I think there is much comfort to be drawn because of: ... with which, based on everything you have told me, I agree. My heat ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Defrost behaviours
8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 6
Views: 783
Reply
RE: ASHP and how it should run and potential kw consumption?

I think that conditions over the last couple of days are about the worst possible - cold but very wet = lots of defrost. I too am interested in what ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Analysing MELcloud heat pump graphs

I'm not an ecodan expert but this looks like defrost to me. The give away is that FT goes below RT.. Conditions for defrost are about as bad as they...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I think you are very likely right unfortunately. This is a somewhat surprising conclusion given that the system was presumably designed by Freedom an...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

I confess Im a bit mystified. How was the WC curve determined. If it was determined experimentally, then cycling and losses in PHE etc would be, at ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

It claims to use the energy integral as part of the cycling control loop, but is silent about how the defrost control loop works, so I dont know! ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

One might expect (hope) that the heat pump takes this into account in the control circuit, by accumulating differences and overshooting to compensate....

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is My Midea Heat Pump Inherently Defective?

OK, so (assuming Freedom are correct) you actually have two problems. The principal one is that the max pump rate is insufficient, leading to your ou...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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