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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 25, 2025
Profile Activity
Topics: 17 / Replies: 2699
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RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

A period of on followed by a period of off is one cycle, but only if followed (or preceded) by more on-off periods. One on/off transition on its own ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

Absolutely could be a volumiser and thats what I would recommend if the extra system volume is needed to meet the minimum requirement.

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

I will answer in a different order in the hope of shedding some light. Before I do though I would make the general remark that, in order to analyse t...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

Nothing wrong with a remote on/off switch. I used to use my 40 year old hall thermostat that way when I had a boiler (as a thermostat it was essentia...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: buffer/volumizer cupboard space eater, do i need one?

You are right, the very low flow temp is the major contributor to good COP. Also, at low flow temperatures, the potential penalty of a buffer is less...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

The installers who insist you need a buffer are ones to be avoided. You may need a volumiser which has only 2 ports. These dont suffer the problems ...

6 months ago
Forum
Introductions, Forum Rules & Updates
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RE: What is this white plastic ring on my radbots?

OK, let me refine my simplified initial statement. Generally I would recommend that any TRVs except (a) for aesthetic reasons as described above ...

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

OK that now makes sense, basically both control loops are operating as expected. If you changed the target deltaT to 5 I presume that the heat pu...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What is this... white plastic ring?

@powysperson You don't say what your heating us. If by any chance you have a heat pump don't fit radbots. In most cases don't fit trv tops either...

6 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: advice on excessive shortcycling and overall efficiency

I agree with the above Fancoiks have a very small water volume and you have a fairly high capacity heat pump in a mild climate. Short cycling is to ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Share Your Experiences with Heat Pump Manufacturer Support

Sorry I'm still not sure what you are actually observing (what do you see as opposed to what do you think might be the explanation) The heat pump ca...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Boston Lincs based homeowner seeks advice on HP install

Difficult to comment. Given the choice I would design for 45 or less and wouldn't accept anyone who won't. I would reject without question anyone wa...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
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