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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Dec 5, 2025
Topics: 19 / Replies: 3619
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Yes, you can work out a lot from a plot of FT. Interesting that there were both deep and shallow defrosts, for reasons I dont understand.  

33 minutes ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

OK thats a pity it would have been good to see if/how defrost changed as a result of switching off night shift and overnight there would have been ple...

37 minutes ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

My Vaillant was defrosting every 45-60mins overnight (chart shows FT). As you can see it doesnt fully recover from the defrosts because noise reducti...

1 hour ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Something odd about this diagram; the refrigerant is moving in the wrong direction for defrost - warm refrigerant from the compressor should be headin...

1 hour ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

Thats a bit suspicious. Some (older?) heat pumps apparently defrost on a timed cycle rather than on demand. I wonder if these are in that category (...

3 hours ago
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RE: Help me keep the faith with my air source heat pump installation

In short, like much on FB, this is nonsense. The amount of heat lost by the radiators to the room (which is what you care about) depends on the aver...

12 hours ago
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

It will be good then to see some plots tomorrow morning to compare! I'm beginning to wonder from your description if it's delaying starting defrost...

13 hours ago
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