Midea ASHP – how to...
 
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Midea ASHP – how to set weather compensation

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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

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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(@batalto)
Famed Member Member
3655 kWhs
Joined: 3 years ago
Posts: 1091
 

Mine is set via service man. Password is 234 to get into it

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

@batalto thank you 👍🏻
It doesn’t change the flow temp on the front of the control panel- is that correct?

any idea what temps to start at and how to adjust?

complete novice here!

thanks- Katie 


   
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(@batalto)
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3655 kWhs
Joined: 3 years ago
Posts: 1091
 

@curlykatie no it won't. They'll look the same. Have you logged in to see what your current settings are?

As a warning, when you make a change it turns off both your hot water and your heating. You'll need to turn them back on at the front panel. Don't learn like I did when we had no hot water in the morning once 

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
Thylacine333 and Derek M reacted
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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

@batalto thanks for the warning!!

so I’ve turned off the weather compensation setting on the controller and adjusted the settings on ‘serviceman’ to 45 degrees at -2 and 32degrees at 15… not if this is a reasonable starting point?! The front panel is still saying flow temp of 50- so how do I know if it’s working to my new settings?!

also, if I find this is too warm, which part of the curve do I adjust initially and by how much?

thank you 👍🏻


   
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(@batalto)
Famed Member Member
3655 kWhs
Joined: 3 years ago
Posts: 1091
 
  1. @curlykatie yeah that flow temp on the front panel stays the same as it's run on and off from the stat. 

You can see details in the operation menu - page 8 of 9. At least I think this is the right one off the top of my head. You can check the manual if you want to double check

16742494643335268678476358785632

Also probably worth getting the app as well.

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

@batalto great- thank you. 
I’ve got the app but it doesn’t seem to have much on it so not sure if I’ve got the right one!


   
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(@batalto)
Famed Member Member
3655 kWhs
Joined: 3 years ago
Posts: 1091
 

@curlykatie it's kind of buried. Go to three dots at the top right, then electric consumption, you can look at those graphs. Then there is even more hidden in the top right dots; where you can find history data!

Bar that you can't find much else in the app. Still, better than nothing. Cathode ray is currently investigating if he can find some more detailed info by extracting it from the ASHP directly.

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
Curlykatie reacted
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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

@batalto more questions!

I am really confused as to whether the system is running on the weather compensation that I set in serviceman or not. I have attached a few pictures of the settings I have selected, along with some of the operation parameters screen. 
On the operation screen, what numbers should I be interested in?!
My concern is on the operation parameters screen the climate curve data is blank. The app would also indicate that it is working at a fixed flow rate temp of 40 as per the front control screen (pic also included). 

I’ve read through the manual but even more confused!

thanks for your help,

 

katie

00474DF2 876C 475D BC35 A4519B013BDE
EEEC265C E62A 4A34 A600 2E52C2BCB459
CFE58035 A3FF 4198 A34D 0D585A68C55D
C57026CE DEDB 4695 8768 23D15BE5F046
05845411 BB7C 4A80 9194 082C7E2E5EDB

   
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(@batalto)
Famed Member Member
3655 kWhs
Joined: 3 years ago
Posts: 1091
 

Looks like it's fine. Might be a little low. It's 40°@-2 and 25°@15. See how you get on and tweak from there 

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE


   
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cathodeRay
(@cathoderay)
Famed Member Moderator
6918 kWhs
Joined: 2 years ago
Posts: 1391
 

@curlykatie - the Midea controller/menus are a nightmare both to read and use. That said, as @batalto says, your screens look about right, perhaps a little on the low side - I am currently on 55@-4 / 35@15, for rads not UFH.

A couple of other comments: your DHW is currently off (as in off at the mains type of off), no squggles next to the tap on the RHS. This is probably because you have been in to the For Serviceman menu, exiting that menu turns off DHW and possibly the heating as well. Your DHW will not heat in this state, you need to turn the DHW on (tap right then tap On/Off to get the squiggles). That will mean it's on, but only in the sense that an immersion heater might be on, but not actually heating, because of a timer or the fact the hot water has not cooled enough to trigger the heater to become active. Very occasionally, I have had the DHW On/Off actually cause the DHW heating to come on. It's Midea, it's idiosyncratic.

On your Front Page view of the controller, in addition to telling you the DHW is off, on the RHS the 41 is your current DHW tank actual temp. On the LHS, that number with the tear drop symbol (very appropriate, they'll be tears before bedtime if I know anything about Midea's ways of working) is meaningless. Occasionally it changes, it may reflect what the leaving water temp would be if you weren't in weather comp mode. However it is very useful for confirming you are in weather comp mode: tap left and then try changing the number upwards or downwards. If you get a message saying you are in weather temp set function mode, do you want to turn it off or Chinglese to that effect then you are in weather comp mode, just use the Back button to leave things as they are.      

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


   
Derek M and Mars reacted
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(@curlykatie)
Estimable Member Member
431 kWhs
Joined: 1 year ago
Posts: 76
Topic starter  

@batalto fab- thank you!
Which numbers am I looking at on the operation screen which will indicate the actual flow temperature? 

what does the fixed temp of 40 on the front screen relate to? I thought this would change as the flow temp adjusted to ambient temp? 


   
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