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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 29, 2025
Profile Activity
Topics: 17 / Replies: 2722
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Have you got a buffer tank with 3 or 4 ports? Do you know what temp the flow gets down to during defrost?

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@davidnolan22 Couple of questions/ideas Are you operating any kind of noise reduction mode Have you got all rads permanently on, no trvs ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@gary Thats really interesting. My Vaillant takes (I think) a different approach and whacks the compressor up to 100% modulation immediately after...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Have you got any plots from melcloud showing how it works during recovery from defrost. I have heard an argument that, if you have lots of fancoils,...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

I would be careful with that presumption. Minimum volume is at least in significant part about defrost, and what matters is the minimum volume availa...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Three pipe buffer

It sounds rushed to me but also that it may not be possible to question the direction. I hope you are lucky! Since he has been doing it this way fo...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Three pipe buffer

Caleffi speak in one of their tutorials about the benefits of a 3 pipe buffer. Someone else may have taken the trouble to understand it. As always ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Sorry but fundamentally you have to. The rate at which energy is absorbed by the emitters is determined by the flow temperature and the pipe area ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

OK. I think your theory, if it applies at all, applies to a small minority of use cases. The vast majority of our housing stock doesn't have UFH an...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Running my new Nibe ASHP efficiently

Yes, its the 'integral' term in a proportional - integral - differential' controller. Vaillant actually call it the 'energy integral', the units are ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Running my new Nibe ASHP efficiently

Vaillant have the same concept. Basically its the sum (actual FT - target FT) * Time. So if the actual FT is 30 and the target 35 and this remains t...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

Understood. You suggest (I think) that your data shows that oversizing is positively beneficial to performance in your case. Have I understood tha...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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