Daikin Monobloc Heat Pump - User guide

Hi All,

Since my HP install in May 2024 I have been trying to understand the settings in the MMI and what I need to worry about changing and what effect each item has on the overall system.

So, I started to create a short form user manual for myself so I don’t have to look at the main Daikin manual very often (hopefully never as it’s a horrible document).

I was thinking does anyone else feel like collaborating to make a useful document that will help other out?

I have made a start and would like anyone else to point out where my document can be improved, add additional information and generally make a really useful document that incorporates our collective wisdom.

If you want to add or comment please PM me and we discuss how you want to get involved.

Here is a link where I have got to so far.

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Hi Dean,

Thanks for doing this. The doc looks great & is easy to read and understand.

Nice one. David.

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I’d actually been thinking of doing something very similar, though perhaps more along the lines of a glossary of terms (modulation, etc.)

I think that modulation allows the heat pump to vary the leaving water temperate depending on how far away the room temperature is from the target. So eg after an overnight set-back, the room temperature might be a couple of degrees low. If the WD is set perfectly, the flow temperature exactly matches the heat loss, but this merely maintains the temperature, whereas you actually want to increase it.

But I could be wrong.

Not sure how modulation and overshoot interact - perhaps if you have modulation, overshoot isn’t needed ?

One suggestion: on the MMI, if you press the help button, it turns on a breadcrumb mode - it shows numbers in the top left which shows which menu / submenu you’re in. It might be helpful to include those numbers on your document to make it easy for people to navigate to a particular config page.

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Indeed modulation varies LWT, though with a rather simple algorithm, at least for my older hybrid, but I think it might apply to the monobloc too:

-if the room is too warm for more than 20 minutes, the LWT setpoint is lowered by 1 step size (which is 25% of the max modulation setting [9-06] which is default 5C (max 10C), so default step size is 1.25C),
-after another 20 minutes of the room being too warm, LWT setpoint is lowered by 2 step sizes,
-until the room temperature goes below RT setpoint, in which the LWT setpoint goes back to regular, or if the room temperature is more than 0.5C too warm, the heat pump switches off,
-and if the room is more than 0.5C too cold, the heat pump switches on (if needed), and after 10 minutes being more than 0.5C too cold, increases LWT setpoint by 1 step size, and after 30 additional minutes, increases it by 2 step sizes,
-if room temperature rises above 0.5C too cold, LWT setpoint increase is limited to 1 step size, and if room temperature reaches RT setpoint, LWT setpoint is set back to regular.

There is no interaction between modulation and overshoot other than that the not so subtle LWT change due to modulation can trigger an overshoot so it is best set to 4C.

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Thank you Arnold this is the best description for Modulation I have seen. Modulation has always been a bit of a black hole that had no definition. I have included this in my user manual if thats ok with you.

Thanks Dave will look at the bread crumbs idea when I have some time.

Hi Dean, absolutely fine, though may be worth checking if it works the same way on your model.