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JamesPa
@jamespa
Moderator
Illustrious Member
Joined: Apr 3, 2023
Last seen: Jul 27, 2025
Topics: 16 / Replies: 2638
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RE: Vaillant arotherm plus heat pump frost protection

We might need to unpack this to work out whats happening. Here is an extract with the paper manual which came a couple of months ago with my unit (t...

6 months ago
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RE: Vaillant arotherm plus heat pump frost protection

Ok, just trying to clarify. So what you are experiencing if I understand you correctly is that when there is no call for heat and the outside temper...

6 months ago
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RE: Vaillant arotherm plus heat pump frost protection

What do you mean exactly by frost protection?

6 months ago
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RE: 4 port buffer tank connections

All fair enough. I dont think I can really add much more beyond what I've already said. if somehow you need to accommodate it switching itself on at...

6 months ago
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RE: Ecodan 6kW - is it "cycling", or normal operation?

All heat pumps cycle, in fact the 'non-cycling' temperature window is quite small even if the heat pump is perfectly matched to the house. Because th...

6 months ago
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RE: 4 port buffer tank connections

Well this is an interesting line of thought and I wonder where MCS would sit (on the fence? as far away as possible?) If manufacturer insists on a b...

6 months ago
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RE: 4 port buffer tank connections

OK thats definitely a different problem. The buffer will presumably cool down fairly quickly in relation to 12 hrs and at that point I imagine that ...

6 months ago
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RE: Ecodan 6kW - is it "cycling", or normal operation?

The plot you posted was more like 80% duty cycle, unless you also increase flow temperature (compromising efficiency) then you cant, at the outdoor te...

6 months ago
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