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SUNandAIR
SUNandAIR
@sunandair
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Honorable Member
Joined: Dec 30, 2022
Last seen: Aug 13, 2026
Profile Activity
Topics: 5 / Replies: 564
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Reply
RE: Analysing MELcloud heat pump graphs

Hi @boycey I don’t think the graphs you posted where they are straight and parallel are actually showing the HP in operation. If you look at them clos...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Analysing MELcloud heat pump graphs

@boycey in terms of understanding MELCloud here are a few graphs from our radiator system we are reheating on a low and slow WCcurve after a 12 c se...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Analysing MELcloud heat pump graphs

@boycey hi, So if your schedule was set back then it would appear the thermostat dropped below the setback temp at 4.40am and started heating but th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Analysing MELcloud heat pump graphs

hi Boycey There needs to be a few bits of other information to be 100% sure. Most importantly is the heat pump operating… 4am looks like hp is off...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Running ASHP efficiently, general thought process. (Low and slow)

hi @boycey I don’t have underfloor heating so can’t comment on what adjustment to the existing setup you might make. hopefully there may be others in ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Running ASHP efficiently, general thought process. (Low and slow)

That’s great @boycey it might help to know how warm the room was at 14:00 and what was the outdoor ambient at the same time. It looks like the cyc...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Running ASHP efficiently, general thought process. (Low and slow)

Hi @boycey Optimum flow rate is 9 LPM for the PUZ WM50. Max/Min is 6 to 14.

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Running ASHP efficiently, general thought process. (Low and slow)

principles are good. regarding DT3 this may or may not be issue. May be issue- if flow rate is high (I believe the 5kw model has a low flow rate, le...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: non-Mitsubishi owners - how much control do you have over your ASHP "freeze stat" function?

@ecodan-efficiency Hi and thanks for your reply. just to clarify, over the past 2 years there have been several discussion threads on the Ecodan ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: L9 error with Mitsubishi ecodan heat pump

@michel54 it’s really good news that your heating is now working. It’s always a bit unnerving, offering advice without fully knowing the system. I ho...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: non-Mitsubishi owners - how much control do you have over your ASHP "freeze stat" function?

well I guess there might be some magic dust after all... even in weather compensation it’s happening. Not just Auto Adaptive. we have put our syste...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: L9 error with Mitsubishi ecodan heat pump

@michel54 hi Michel. The L9 fault is specific to a problem with the flow rate registered by your flow meter. If the flow rate drops below the usu...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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