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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Aug 18, 2025
Profile Activity
Topics: 17 / Replies: 2696
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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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
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, ...

4 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...

4 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...

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

Im not sure what you are monitoring but defrost is normally done by switching off the fan reversing the direction of refrigerant flow so the heat ...

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

If your ASHP has both a pressure sensor internally and isolation valves and you also have a pressure sensor one on the expansion vessel then you can i...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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