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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 11, 2025
Profile Activity
Topics: 17 / Replies: 2824
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RE: Best control strategies for heat pumps that are way oversized

We don't and they may well be overstated. Certainly there is a reduction in efficiency because the heat pump has to run at a higher ft, but this migh...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

Possibly not. As I understand it this mode, which many heat pumps have, caps the compressor speed which reduces the maximum output but not the minimu...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

It will, but it's heating more than you need assuming you are happy with the current downstairs temp and unlikely to fix the basic problem ie that the...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Best control strategies for heat pumps that are way oversized

Indeed. In this case I would personally leave it to the heat pump. However if you can align the cycling to cheap periods that's a wholly different s...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Best control strategies for heat pumps that are way oversized

Yes, as can more capable heat pump controllers

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

... which is probably its min output. At 12C you would expect cycling even if the pump was right sized, it gets colder later this week so i suggest r...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

That will be the water pump capacity not the heat pump capacity, which is dependent on the house loss. The water pump may be on longer than the heat...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Best control strategies for heat pumps that are way oversized
8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 20
Views: 1518
Reply
RE: Hitachi Yutaki M efficient operation

That's disappointing. It's way oversized almost without any doubt. 6kW is probably nearer the mark, possibly less. I will re-read your description...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

@iraknic Ok I was hoping 6 was 6kW not 6 tons (an American measure of capacity roughly equal to 3kW). I suspect it's well oversized. What do y...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki M efficient operation

I am not familiar with the Hitachi monitoring so someone else will need to answer this. If you can monitor power consumption it will be visible in th...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculators and spread sheets

@transparent @sicky Just a couple of observations 1. Sadly I would say the standard of work is exactly what one expects, this is either the b...

9 months ago
Forum
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