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cathodeRay
cathodeRay
@cathoderay
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Joined: Feb 28, 2022
Last seen: Sep 12, 2025
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Topics: 17 / Replies: 2129
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RE: Do setbacks save energy without compromising comfort?

This is the point that I failed to get across to @derek-m, whether we like it or not, as far as the heat pump is concerned the OAT, is what it is wher...

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

But based on what? At any one point in time, the OAT is fixed, the Set LWT is fixed (by the WCC or because the heat pump is Fixed LWT mode), but what ...

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

@derek-m - let's not start rowing again, but what exactly does 'no problem' mean or contribute?

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

Unfortunately there is no way I can run with such a low LWT and have a warm house. This was known about at design time, having a small listed building...

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

I am still unclear how practically to do this. The OAT has been falling overnight, and is currently 4 degrees, ie approaching the defrost cycle range....

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

Yes, it is in one of the modbus registers, and I just collect it as I would collect any other register value. I'm guessing it is set by an algorithm t...

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

I thought the intention with the Met office data was to verify the accuracy or otherwise of the Midea OAT, and if it passed muster then it could be ac...

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

I had considered something along these lines, but came to the conclusion that it needs a free flow of air to reflect the local air temp. It has 5V goi...

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

Yes, the real problem is the cycling, even at OATs that should have a steady LWT. Below 5 degrees OAT it will defrost cycle, above a certain OAT it ha...

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

I don't think the AA script will do anything, recall it changes the ends of the WCC, which by definition won't be in use if WCC is off because Fixed L...

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

@derek-m - I'm going to turn off the setback as from tonight, and will try a period of fixed LWT starting tomorrow morning, and will monitor what happ...

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

It's the same with Midea, most of the values are integers. I have just taken a pragmatic view that that will have to be good enough, and it is certain...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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