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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...
Latest Posts
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RE: Anyone concerned about GivEnergy?
@editor Thank you for your reply. We do have an active ...
By SUNNYSKIES , 7 minutes ago
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RE: Estimating true heat loss from twelve months of consumption data
@ian33a — a measured heat loss always trumps a calculat...
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RE: Setback savings - fact or fiction?
@cathoderay Thanks for your detailed response.Just two ...
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RE: Grant Aeona 3 R32 cycling with weather compensation.
The hot water heating looks normal. The heat transfer ...
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RE: A2A vs A2W: Which Heat Pump Would You Pick?
Good questions @temperature_gradient. My understanding ...
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RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
All going according to plan, mid July we get that 7kW a...
By Batpred , 16 hours ago
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Current metrics - DHW target set to 47c
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RE: My Grant R290 9kW Heat Pump Installation
@petch I'm very sorry that I have not picked up your po...
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RE: New Solar, Batteries, Air Source and Under Floor Heating advice please
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RE: DIY or Don’t Touch? Solarman Smart Meter Install
That was my understanding also.
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RE: Vaillant Sensocomfort Time
Oh I remember this from when I set mine up 2 years ago,...
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Heat geek have already stated that the pro is in fact c...
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RE: The Myth of the MCS Performance Guarantee
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