Midea ASHP – how to set weather compensation

Curlykatie · 2023-01-20T17:15:11Z

After lots of help from @derek-m around balancing the system I am now looking for some advice on how best to set weather compensation. We have moved into a 4 bed new build with a Midea ASHP and underfloor heating throughout and individual thermostats in each room. I have looked at the manual and on YouTube but still rather confused as to the best way to set weather compensation. On the main panel I have found the option to select the weather compensation curves- when I click through it says ‘zone 1 high temp mode’ and ‘zone 2 low temp mode’- I have found the high and low temp curves in the manual but unsure which I should be selecting? I also came across a video on YouTube about setting for weather compensation within the serviceman settings? Thank for everyone’s kind help, Katie

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Air Source Heat Pumps (ASHPs)

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benson

(@benson)

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04/09/2025 8:22 pm

@pash44pump what we did to resolve a not too dissimilar issue with our installers was to simply provide them some screenshots of our graphs showing IAT, OAT, and flow temp over a 24 hour period or so- as Cathoderay says the proof is in actually whether it works, rather than heat loss estimations. For us this clearly evidenced that a max flow temp of 45 (which they specified would be required to meet design temp at -2) was not enough to keep the house warm enough, when it was between 0 and -2 outside.

Hope you get it all sorted.

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cathodeRay

(@cathoderay)

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05/09/2025 8:06 am

@pash44pump - to collect the IAT/OAT data, can I suggest you get a couple (more if you want) of these RC-4 data loggers:

Ebay listing here, these are used but look OK to me, under a tenner each. New ones are also available for about £20, see also on Amazon. They run for ages off a button cell, logging the air temperature at whatever interval you specify (I use an hour). You can then download the data over USB in spreadsheet format using a rather clunky software interface and produce whatever charts take your fancy.

I haven't done it (because I get the data via the wired controller), but it may also be possible to record at least an approximation to the flow temp, by taping and then insulating the supplied external probe onto the primary flow pipe. For air temps, you don't need the external probe.

I can go into more detail later if necessary, but there is one potential difficulty: the time stamps in the two (or more) data sets are different eg one data logger records the temp at nine minutes past the hour, the other at ten minutes past the hour, ie the data is out of sync, which can make for awkward plotting, but there are ways round this eg just remove the minutes (datetime stamp becomes yyyy-mm-dd-hh, but you do have to be careful, spreadsheets can be very annoying in the way they handle date/time) .

Midea 14kW (for now...) ASHP heating both building and DHW

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