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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 22, 2025
Profile Activity
Topics: 17 / Replies: 2698
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

It might actually account for more defrosts because the compressor is working harder. On the positive side it should cycle less at mild temperatures!...

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

Interesting. What does the water pump do during this. I understand the compressor stopping, its will need to do that to switch from heating to coo...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

I have not yet seen a set of performance curves for a heat pump with more than a factor of 3 between max output (at say OAT - 2C) and min output (at s...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Its actually very cold at night just at present, mine is runnoing at upper 30s flow temperature and going into defrost mode overnight! Looks like...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan consuming 100kwh per day in new build!!!

Sorry to hear this is not yet fixed but please do keep posting as those here can help. At present its actually very cold at night despite the warm da...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

Sorry to hear this, it shouldn't happen! Did the installers bump up the WC curve again and/or reinstate control by thermostat, undoing all your good...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Help me keep the faith with my air source heat pump installation

Which, if you are right (which you may be), is unfortunate to say the least, because climate change and the catastrophic effects it is certain to have...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Pressure drop Primary circuit

PHE s can fail, I'm not sure what the most common failure mode is. If a plate separating the two circuits failed pressures will presumably equalise, ...

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

Hitachi is sadly not alone. The OAT sensor should be in the shade and out of any influence from the heat pump itself. only some manufacturers do thi...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Pressure drop Primary circuit

If you have heat exchangers between primary and secondary the two circuits are isolated so a leak in one wont affect the other. So whichever pressure...

5 months ago
Forum
Air Source Heat Pumps (ASHPs)
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