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Fine tuning your ASHP performance

 
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Air Source Heat Pumps (ASHPs)
Last Post by MarkC 3 years ago
195 Posts
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 LittleRed
(@littlered)
Eminent Member Member
Joined: 4 years ago
Posts: 37
04/12/2021 6:56 pm  

@derek-m Thanks, I will ask him. He has more technical expertise than I have and has lived here for longer so has been monitoring temperatures for some time. I am clueless about this system, just expected it to work with the installer settings, call me naive, but when I buy a car I expect it to work without me having to go under the bonnet every day, same with this heating system, I have no desire to be constantly measuring, just want to know that it is set up correctly. How much space do you suggest should be around our air pump? 



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
04/12/2021 7:08 pm  

@littlered You need as much space as possible, since the cold air coming out of the front needs to dissipate into the surrounding atmosphere, so that only fresh 'warmer' air is drawn in at the rear and the side. I think from photo's that you provided that there is a fence near the front of your ASHP, which could be deflecting the cold air back into the intake.



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
04/12/2021 7:21 pm  
Posted by: @dant

Whilst it’s quiet then 🙂

I just had this from my ASHP installer when I asked them about weather compensation mode - I have a LG Therma V, with UFH downstairs and radiators upstairs. Would welcome feedback on their reply from this audience.

 

"Hi Dan,

All good here thanks. Glad to hear you’re both on the mend, it’s a tough gig being ill with a little one isn’t it!

When we have rads and UFH working together we tend to find using the weather compensation curve is not particularly effective. It can mean that there’s low temperature water in a convective radiator panel which doesn’t provide sufficient output. Our customers with similar set ups are far happier to hit a set flow temp of 50/55 which ensures the panels convect warm air into the rooms.

You can experiment with using the weather compensation mode to see if it suits, but we would recommend just to keep the set flow temperature. Ultimately the thermostat will turn off once it’s hit the set temp so the heat pump will be operating for a shorter period of time at a slightly higher flow temperature and  you’ll find little difference in the ultimate efficiency. You could try adjusting the set back temperature by a few degrees which would mean the temperature in the house is maintained.

Hope that makes sense and do come back to me if there are any further issues re. upstairs heating."

Hi Dan,

I thought that I had responded to this question previously.

I'm afraid it would appear that many installers are quite happy to set a fixed water flow temperature of 50C or even 55C, because they will not have to spend time and effort setting up the weather compensation, and since they are not paying the electricity bills, why should they care.

As has been previously established, running an ASHP at high water flow temperatures is not only inefficient, but quite costly. I would suggest that you ask your installer to come back, at their expense, to set up your system correctly on weather compensation, though I suspect that you will not have much success if you have already paid the invoice.



   
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 LittleRed
(@littlered)
Eminent Member Member
Joined: 4 years ago
Posts: 37
04/12/2021 9:24 pm  

@derek-m There is a path directly in front of the pump about 1 metre wide, then a fence, but I will certainly add this advice into the feedback we are collating as neighbours while trying to ensure we all have the best set up before the developers leave the estate.



   
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 witchcraft
(@witchcraft)
Estimable Member Contributor
Joined: 5 years ago
Posts: 91
05/12/2021 7:58 am  

@derek-m Mine was 55 degree flow temperature curve at 1.5 Weather compensation off after "commissioning".  Our rads were probably hotter than with the old oil boiler - house was toasty throughout, electricity meter was let's say sweating under the load.



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
05/12/2021 9:01 am  

ok, I have read all the posts about this subject and am still lost as to how I go about finding how to start checking my system (im a complete novice). I have a Vaillant AroTherm Plus 10. It was commissioned in August this year. Any help as to how I get started with finding out my performance and fine tuning will be welcome together with feedback! 😀 



   
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 witchcraft
(@witchcraft)
Estimable Member Contributor
Joined: 5 years ago
Posts: 91
05/12/2021 9:24 am  

@nigel42 Go to Control/Installer level on the black room control unit and its all there .  Installer code is 00 as a default unless your installers changed it. (Now if you can work out how to change the DHW temperature please tell me 🙂 (I have a Vaillant Arotherm Plus 12kW)

 



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
05/12/2021 10:22 am  

@witchcraft ok thanks, i'll take a look. Soz about help re how to change the DHW. Not a clue!



   
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 Justin
(@justinsb)
Estimable Member Member
Joined: 4 years ago
Posts: 100
05/12/2021 10:22 am  

@nigel42 get into the habit of recording your electricity meter each day, at roughly the same time. That way you can actually see what your "normal" usage pattern are costing you, & find out if any changes that you make are having the desired effects (ie using less electricity). It's a bit of a pain to begin with, but it really helps to set up your baselines



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
05/12/2021 10:25 am  

damm it. code didn't work. Installers must have changed it! 😥 



   
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 Justin
(@justinsb)
Estimable Member Member
Joined: 4 years ago
Posts: 100
05/12/2021 10:42 am  

Have a really good look through the instructions & online, as my one has a very helpful password reset function at the back of the docs. Ok, mine's an Ecodan, but you never know your luck



   
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 batalto
(@batalto)
Noble Member Member
Joined: 5 years ago
Posts: 1092
05/12/2021 11:14 am  

@nigel42 call the installers - it's your unit. Or just test some numbers. It's two digits...


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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