Mitsu PAR-WT60R Wireless Controller - options

Air Source Heat Pumps (ASHPs)

Last Post by Abernyte 3 weeks ago

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DavidAlgarve

(@davidalgarve)

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Topic starter 17/09/2025 5:37 pm

I hope I have satisfactorily installed the above wireless controller on my PUHZ-SW120/ EHSC-VM2D, although testing is not yet practical with OAT's of 33C+.

I have been operating on weather compensation in recent winters, but I wonder if contributors having a similar set up, could give me their experience using the wireless controller with "Auto Adaption" as opposed to using it with "Weather Compensation"

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Abernyte

(@abernyte)

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18/09/2025 6:31 am

I have been running mine in auto adapt since 2019 and it has proved highly effective. There is a period of learning while it gets a feel for how quickly the house gains or loses heat. I have a leaky timber framed house in an elevated and exposed Scottish hillside so things can get chilly when the east wind blows. Once it settles it seems very good at anticipating changes of temperature and keeps the structure at a very stable comfortable point. It can occasionally overshoot if the temperature rises rapidly and internal temp can hold a bit on the warm side but nothing drastic. I recommend it.

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DavidAlgarve

(@davidalgarve)

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Topic starter 18/09/2025 12:19 pm

@abernyte Thank you for passing on your experience and it is much appreciated,

I would like to learn more about the way in which auto adapt learns and adjusts. Does it increase/decrease the flow temperature depending on the rate of change of temperature in the room where the wireless controller is placed?

If that is the case, would it not be helped/ improved by using data from weather compenstaion, which presumably is available somewhat earlier? Or is it already collecting that data?

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Abernyte

(@abernyte)

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18/09/2025 3:37 pm

How it does it's job is something of a mystery although it is clearly managing the WC curve as a result of what data the wireless controller is feeding it. I was told by the installer that the positioning of the wireless controller is important in a single zone setup, avoiding direct sunlight and placing it as near to the central part of the house as is feasible.

It all seems to have worked seamlessly for me but I do acknowledge that I was fortunate in using an installer who was very knowledgeable and experienced with HP installations. I honestly don't need to look near the system. I use MelCloud scheduling for all the seasons and rarely need to alter any settings. It is as close to heating system fit and forget as you can manage.

👍

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