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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Oct 20, 2026
Profile Activity
Topics: 18 / Replies: 3075
AllTopicsReplies
Reply
RE: Performance in the current cold snap…

@hughf - it's painful. The last week:

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Daikin problem

@togfather - I too have an old stone built home, a cottage rather than a barn, though listed. Unless you have done a lot of insulation and leak fixing...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

At the moment (just measured), rads ~47, primary in 53, secondary out 54 degrees (not a typo, either measurement error or some sort of lag effect perh...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

A heat pump on the verge of a nervous breakdown: Miraculously, the current actual IAT is only 1.4 degrees below the desired IAT. But just look...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

Thanks for such a detailed description in words. It really does help my understanding of what you are doing.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

It is certainly interesting that the numbers should be so similar. Looking at the last week's use, to 0700 yesterday (Monday), it is still in the same...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

Yes, I came across Raspberry Pi solutions, but it means adding a whole new layer of complexity which I think I could manage technically (can solder wi...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

@toodles - yes, that makes sense, though I can't see the LWT magenta line poking out from the bottom of the fourth defrost in your latest chart. It ma...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Do setbacks save energy without compromising comfort?

@scrchngwsl - thanks, though I will need to put my thinking cap on to get my head round that lot! I have thought about how to do this a few time...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Defrost Cycles - How Common Are They?

I think they are there. I have marked them with blue crosses: The key mark of a defrost is the LWT (flow temp) falls below the RWT (return tem...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

Thanks for the kind thoughts. At least it is sunny as well as less humid, and the cold won't last forever.

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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