Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Airwell/Midea unit ...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Airwell/Midea unit not heating hot water after adjusting weather compensation

 
Air Source Heat Pumps (ASHPs)
Last Post by Thylacine333 3 years ago
5 Posts
3 Users
0 Reactions
3,338 Views
RSS
 Thylacine333
(@thylacine333)
New Member Member
Joined: 3 years ago
Posts: 6
Topic starter 18/01/2023 5:00 pm   [#758]

Hello,

 

I have an airwell monobloc 12 kw ASHP - I understand it to be essentially a rebranded midea unit and certainly the instructions seem to be identical.

The installer set it up to run rads as well as new under floor in an extension. They have it linked to salus room thermostats and originally it was set up like a conventional boiler- turning on and off according to set temp on the thermostats. I followed advice and have been targetting flow temp with the thermostats set just above comfortable room temp to try to find a 'low flow temp/ on all the time' setting to maximise efficiency.

However, since adjusting the weather compensation (instructions from Graham Hendra's really helpful youtube video on the Midea unit) it does not seem any longer to be heating the hot water tank. The house heating is working very well and much better with flow temp adjusted way down from the default -2 and 15 degree settings but the hot water tank only heats for the weekly immersion 'anti legionella cycle'. The wavy lines used to come on next to the DHW icon and that also no longer happens.

I don't know whether I have inadvertently tweaked something I shouldn't have when adjusting the weather comp, or if somehow going from the room thermostat led initiation to leaving the heating on all the time at low flow water temp has affected something.

I've had a look at Graham's Midea set up video as well and the hot water settings seem to be as they should be (at least superficially).

The installer is I am afraid to say hard to track down.

I would be very grateful for any thoughts. I can't help thinking this must be something simple and silly (fingers crossed!).

 

many thanks!



   
Quote
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
18/01/2023 6:02 pm  

Posted by: @thylacine333
↑

Hello,

 

I have an airwell monobloc 12 kw ASHP - I understand it to be essentially a rebranded midea unit and certainly the instructions seem to be identical.

The installer set it up to run rads as well as new under floor in an extension. They have it linked to salus room thermostats and originally it was set up like a conventional boiler- turning on and off according to set temp on the thermostats. I followed advice and have been targetting flow temp with the thermostats set just above comfortable room temp to try to find a 'low flow temp/ on all the time' setting to maximise efficiency.

However, since adjusting the weather compensation (instructions from Graham Hendra's really helpful youtube video on the Midea unit) it does not seem any longer to be heating the hot water tank. The house heating is working very well and much better with flow temp adjusted way down from the default -2 and 15 degree settings but the hot water tank only heats for the weekly immersion 'anti legionella cycle'. The wavy lines used to come on next to the DHW icon and that also no longer happens.

I don't know whether I have inadvertently tweaked something I shouldn't have when adjusting the weather comp, or if somehow going from the room thermostat led initiation to leaving the heating on all the time at low flow water temp has affected something.

I've had a look at Graham's Midea set up video as well and the hot water settings seem to be as they should be (at least superficially).

The installer is I am afraid to say hard to track down.

I would be very grateful for any thoughts. I can't help thinking this must be something simple and silly (fingers crossed!).

 

many thanks!

I would suggest that you check to see if your system is set for CH priority rather than DHW priority. If so, set it to DHW priority and schedule it for times when you require less heating.

 



   
ReplyQuote
cathodeRay
 cathodeRay
(@cathoderay)
Famed Member Moderator
Joined: 4 years ago
Posts: 2895
18/01/2023 6:35 pm  

@thylacine333 - I got caught by this one, at least my guess is it's the same problem. It's another user unfriendly gotcha. Going into For Serviceman and setting the weather curve numbers turns off DHW heating. Your tank will cool, and then die. The solution is to manually turn it on again after exiting the tradesman's entrance. Do it on the main home/front page, right arrow to hot water and make sure you've got the squiggly lines by the tap symbol using the On/Off button, then OK. The squiggles just mean the hot water is 'on' in a general sense, and will call for heat when it needs to, with no squiggles it is 'off' and will never heat. It's like turning an immersion heater on and off at the mains.      


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


   
ReplyQuote



 Thylacine333
(@thylacine333)
New Member Member
Joined: 3 years ago
Posts: 6
Topic starter 18/01/2023 10:22 pm  

@cathoderay thank you so much I think this is the problem! Yes I thought the squiggly lines meant that the ashp was actually heating the tank at that moment rather than just it was ‘on’ in the usual sense.

I thought it had to be something silly and simple but you’ve saved me a lot of time and stress and trying to sort it out!



   
ReplyQuote
 Thylacine333
(@thylacine333)
New Member Member
Joined: 3 years ago
Posts: 6
Topic starter 18/01/2023 10:29 pm  

@derek-m thanks for the suggestion. I think it seems to be a quirk of the control system. Hopefully sorted now fingers crossed!



   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Worth Watching

Latest Posts

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security PRO
This Site Is Protected By
Shield Security PRO →