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SUNandAIR

@sunandair

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Noble Member

Joined: Dec 30, 2022
Last seen: Dec 19, 2025

Topics: 5 / Replies: 503

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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...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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 ...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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.

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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...

12 months ago

Forum

Air Source Heat Pumps (ASHPs)

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 ...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

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...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

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...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

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...

1 year ago

Forum

Air Source Heat Pumps (ASHPs)

RE: L9 error with Mitsubishi ecodan heat pump

So many questions. but if you’re having to manually activate the circulator it sounds like it’s not set up properly. your language setting is set...

1 year ago

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