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davidnolan22
@davidnolan22
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Joined: Jan 15, 2025
Last seen: Jan 7, 2026
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Topics: 0 / Replies: 136
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RE: Yes, the "zoning with ASHP" topic again...

My original “design" from my installer for my 11.2KW heat pump was a 9 zone system. One of the zones had a flow rate of under a litre a minute. That...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me understand my Mitsubishi Ecodan system

@gergoh The 8kw newish r290 Mitshi machine can modulate really low. might be a good option.

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Help me understand my Mitsubishi Ecodan system

@ashp-bobba I'm not a heating engineer, but with a heat loss of 2.5kw at minus whatever, is there any heat pump that can modulated low enough ...

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

@cbrenewable What's the heat output each day for the last few days, and the input. My COP is 6 and over at the minute. The big rads not gettin...

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

@cbrenewable Hi, the graphs from Mel pump would be good. Can you draw your system, have you got a low loss header? or are you directly piped into ...

9 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

@sandman1600 you need to measure whats going on really before you make loads of changes. If you can measure the temp of the flow and return to and ...

9 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

the reason why cop is bad is the delta t's on the primary circuit are small, so its not giving out much energy by the mitshi calculations. nobody kno...

9 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

Has anyone been to check what is going on with the secondary side of the system with the UFH? I’ve not read all the posts recently. The minimum modula...

9 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

Yeah, big balance isn’t it. Big enough to heat commonly cold days, but not so big ruins more typical temps. im not sure where in the country the unit ...

10 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

I’ve circle your compressor output. It’s just going from low to minimum output to off. And then as we thought, off all day. But it’s warm today, but m...

10 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

@sandman1600 it’s tricky. Looking at the graphs: it’s not ideal. It’s on/ off all the time as it can’t modulate lower. Personally, I’d not be hap...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Volumisers in Heat Pump Systems: Does Placement Matter?

@gary mine was “designed” to 45, bit system can’t get above 36. That bit was nonsense. from looking at your graphs of one day: you’ve got loads of ...

10 months ago
Forum
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