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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 8, 2025
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Topics: 17 / Replies: 2679
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RE: Performance of Heat Pumps in Mild Weather

'and thus its capacity' assumes that output is a linear function of modulation frequency. But I dont think thats the key point so lets not argue over ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Aren't you potentially confusing two things here. OP could of course increase rad size/ volume and reduce ft but that won't change the minimum output...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

It can't once it has got to minimum frequency. If it isn't already at mine frequency then I agree. That would overheat the house. If house ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@heatgeek here is the Farnborough Daikin on 7th April. A steady 7+kW when heating hot water and then a steady 1.6kW when it returns to space heating....

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Im really gutted for you, there are loads of Ecodan 11.2kW machines out there and its a very popular and well renowned make, so it should work well. ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

@adamk Please feel free to post any proposals for comment. I'm sure you will get some useful feedback. If it helps, and I hope it does, my Vailla...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

To the best of my knowledge demand < minimum output is the only reason for cycling other than defrost, unless of course there is something else (eg...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

which (a) is, I suspect, the outcome he wants (because he doesn't want to bother training up) and (b) may well be at least in part true because of...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

After I wrote my initial comment I guessed that might be the case! Turning down the flow might reduce the peak power output but I cant see how it...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

... which presumably will reduce the cycling frequency but not materially change the on/off ratio (which is determined by the ratio of demand to minim...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Sorry I cant help further. Knowing when the various components (compressor, fan, EEV, water pump) change state might illuminate the matter, but other...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Cycling will occur if the heat demand (measured in kW) from the house is less than the minimum output of the heat pump (also measured in kW), which is...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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