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

Page 25 / 25 Prev

Air Source Heat Pumps (ASHPs)

Last Post by JamesPa 43 minutes ago

291 Posts

18 Users

41 Reactions

44 K Views

RSS

JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 3726

20/12/2025 5:07 pm

Posted by: @pash44pump

↑

@jamespa thank you. The "incentive" for using the original installer is that because they accept that they put in an undersized HP at the outset, they have agreed to replace it with a new HP at their cost (kit and installation). The downside is that they are being prescriptive on what they want to fit so I'm trying to find a reasonable compromise.

Regards

Ok given that history they aren't going to risk under sizing. I made a couple of suggestions above.

Is it really impossible to fit R290, the rules aren't quite as restrictive as some claim

This post was modified 2 hours ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

ReplyQuote

pash44pump

(@pash44pump)

Estimable Member Member

Joined: 4 months ago

Posts: 63

20/12/2025 5:08 pm

Suggestions noted thank you

ReplyQuote

JamesPa

(@jamespa)

Illustrious Member Moderator

Joined: 3 years ago

Posts: 3726

20/12/2025 6:09 pm

Just one more thought. If you have convenient space for the 20kW cascade and your installer is paying then it possibly isnt a bad option. Most of time only one will be running, possibly at a slightly better efficiency than would be the case with a single larger unit. You almost have a spare. Depends on the plumbing of course but if you have plenty of otherwise unused low grade space and the additional cost is paid for by the installer perhaps this shouldn't be ruled out. Annual service might be double though so mind that.

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.

ReplyQuote