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Last seen: May 29, 2025
@potatoman As no one seems to be obliging, I attach a diagram. The idea is that only bypass flow goes through the tank when necessary so it is undistu...
@trebor12345 The Auto function is supposed to adapt automatically and select the right curve in constant pressure mode. By default the pump is set to...
@trebor12345 Your house is remarkably similar to mine, layout included. I have 185 sqms with 4 beds and 2 baths, same size lounge with exactly the sa...
@trebor12345 Use the internal private messaging system on this forum.
@trebor12345 Re your question about changing setting to controlled DT, this may be worth trying if your current DT is 1C as the heat pump will automa...
@trebor12345 There doesn't seem to be anything obvious on the refrigeration cycle as the temperature ups and downs look logical. However your DT is e...
@trebor12345 I can send you a service manual however it is very large (200MB) so exceeds the file size limit here. If you can send me an appropriate ...
@trebor12345 The penny has finally dropped. I thought you were describing defrost sequences. If you say that this happens at 20C OAT, it is not norma...
@trebor12345 @jamespa From the calcs you sent, your house conforms with modern insulation standards e.g. roof u-value 0.11. Your overall heat loss is...
@trebor12345 The heat exchanger function is the same regardless of whether it is inside or outside. Your heat pump is a 7kW unit, not 3kW as per y...
@trebor12345 By way of further explanation, in cooling mode the compression cycle of the heat pump reverses i.e. the gas flow goes in the opposite d...
@trebor12345 Firstly, the brochure description of the Hitachi says that it definitely uses hot gas bypass for defrost as per the process I described...
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Latest Posts
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RE: Vaillant ecoTEC Plus - Flow Temp and Set Up
That is not the case. The heating curve adjustment set...
By JamesPa , 12 hours ago
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RE: Free app: run the immersion / heat pump from Growatt battery & solar surplus – no Home Assistant
Please bear in mind, everyone, that in order to use thi...
By Majordennisbloodnok , 16 hours ago
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RE: The good, the bad and the not that great – my heat pump installation
@burtis Thanks for posting this and Im so pleased you ...
By JamesPa , 18 hours ago
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RE: I need help with Ecodan ASHP
@f1p It turns out there have been a solar panel install...
By Andris , 1 day ago
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews your installer would be right to say that the...
By GrahamF , 1 day ago
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RE: Tradespeople on Their Phones: What’s Acceptable When They’re Working in Your Home?
Actually, that's a very important point. I've only ev...
By Majordennisbloodnok , 2 days ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@susannasaunders can I just add to @rob-of-york s comm...
By JamesPa , 2 days ago
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RE: Aerotherm and weather compensation
These are likely inked. The basic explanation is tha...
By JamesPa , 2 days ago
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RE: Electrical works for air to air heat pump
agree with above. I have not had extra costs added wh...
By Batpred , 2 days ago
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Good to hear that you found a solution. Absolutely a...
By Batpred , 2 days ago
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RE: Are there any comparisons of DHW heat stores around?
@sarahemmm I have done things the opposite way round I ...
By Toodles , 2 days ago
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RE: How will removing the standing charge on gas bills benefit heat pumps?
The BUS grant funding for 2026/27 will run out at the c...
By Rob of York , 4 days ago
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RE: Say hello and introduce yourself
@e-a-west as the good Major said, welcome to the forums...
By Mars , 5 days ago
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