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SUNandAIR
SUNandAIR
@sunandair
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Noble Member
Joined: Dec 30, 2022
Last seen: Dec 19, 2025
Profile Activity
Topics: 5 / Replies: 503
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Reply
RE: Help with understanding my Mitsubishi Ecodan air source heat pump

@patch I think @ashp-bobba gave you some great pointers about low temperature operation. While it is more efficient to operate at lower flow temperatu...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help with understanding my Mitsubishi Ecodan air source heat pump

Not quite Right Morgan… the freeze stat function monitors system internal water temperature and activates the circulation pump to ensure the outside w...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP Ecodan L9 error - No Heating but Hot Water

That’s interesting, but obviously concerning also…. Do you know how to access the flow rate enquiry menu on your main controller? IE the screen enquir...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: ASHP Ecodan L9 error - No Heating but Hot Water

@phoenix15 just wondering did you eventually find the other filter. Many of the Mitsubishi installs don’t always use the Y strainer. Instead thy have ...

8 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?

Logically, the lower frequency = more gentle, yes, but isn't the main wear/damaging issue here the stopping then restarting, and possibly the 'burst' ...

8 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?

@rhh2348 it’s clear you are wanting to run your heat pump at a low flow rate ie 30c. But you are also aware of some of the limitations of operating at...

9 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?

So James I’m sure you might realis that my first 2 points were giveaway comments - ones that you couldn’t really object to. So your agreement is some...

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

@trebor12345 it should be possible to work out the (nominal) input from the data provided since it has COP and output data. The chart would suggest ...

9 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?

Hi, This set of comments all appear to be set in theory rather than making specific answers. for instance when you say “lower flow temperature and ...

9 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...

9 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?

@jamespa not sure what you mean… is that a theoretical comment or a comment from experience.?

9 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?

First thought is that cycling is a designed in process. And Mitsubishi appears to to have a 20 minute minimum run time for normal operation with 3 to ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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