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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 10, 2025
Profile Activity
Topics: 17 / Replies: 2682
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RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

yes thanks! Im not sure I can really comment further as your key concern (unless I misunderstand you) seems to be the thermal offs which appear to b...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

I cant immediately see anything wrong but I also cant follow the pipework. As you say this is a poor time to test/set things up, but I would still ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

Great. If you could post a picture of the area around the cylinder it would confirm that there is nothing untoward here.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

Can you explain what you mean by 'off' please? If they are off how is that affecting the heat pump/circuits. If you are getting a SCOP of 3.5 what ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@cbrenewable Hopefully the diagram shows one of the valves in the wrong place, otherwise there is a valve in the wrong place. Any idea why two pumps...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Hitachi Yutaki SCombi Heat Pump - Thermal Off's

@trebor12345 Hi. What is it you are still trying to solve/understand. I will see if I can help. Definitely that is a 4 port buffer.

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@CBrenewable A COP of 2.4 is definitely low and you are right to be concerned. You should be seeing 4 or better at present. Can you tell us s...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: help sizing rads based on room by room heat loss

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: help sizing rads based on room by room heat loss

Have you got the loss calculations, if so perhaps you could post?

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: help sizing rads based on room by room heat loss

The output of a rad is proportional to DT to the power 1.3, where DT is the average temperature difference between rad and room. At a flow temperatu...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

Just to clarify this was a serious question, its going to be easier to explain your observations above if you have plots. If you dont then just say a...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

Ok on second thoughts scrub the questions. Id be tempted to optimise the rads as previously described. If you find that this results in a rad curve ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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