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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
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
05/12/2021 12:33 pm  

found the code! 17. what do I look for? and what readings are best?



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4427
05/12/2021 2:57 pm  

@nigel42 

Hi Nigel42,

For me to be able to provide the best help and advice, could you please provide a list of the equipment installed within your system, so that I can ensure that we are both looking at the same information.



   
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 batalto
(@batalto)
Famed Member Member
Joined: 5 years ago
Posts: 1091
05/12/2021 3:54 pm  

@nigel42 you're wasted on this forum. I hear GCHQ is always looking for code breakers


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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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
05/12/2021 9:34 pm  

@derek-m Thanks, i'll get on it!



   
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 Colin
(@colin)
Estimable Member Member
Joined: 4 years ago
Posts: 56
06/12/2021 4:17 am  
Posted by: @witchcraft

@nigel42  (Now if you can work out how to change the DHW temperature please tell me 🙂 (I have a Vaillant Arotherm Plus 12kW)

For my Arotherm Plus 12kw which is currently set for Fixed heating mode, I can change the DHW temperature on the Sensocomfort by going to Control -> Domestic Hot Water -> DHW Temperature

I've still to test in other modes but according to the manual you can try here:-

Settings -> Installer Level -> Installation Configuration -> DHW Temperature

C.

 



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
06/12/2021 10:39 am  

@derek-m hi, Here's my set up in photos.

 

Other factors which might help you. 

3 bedroom semi detached 130m2 

recent refurbished house, lots of insulation! 

No Gas

UFH to ground floor, no rads.

Electric rads in bedrooms . Electric UFH in 2 shower rooms.

4.62kw solar panels



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
06/12/2021 10:49 am  
D85EAA94 D587 4736 AD61 0128088AEABD
8C4CE333 6975 4B50 8233 A93B1840E350
F0DEC150 A6CF 4E12 80A8 0CF3045816A0
A85ABEE7 7299 48B2 8BF0 A6AAA0E5D8FD
84A450CD 685C 48D1 8526 09600A65CE8E
12A5492D 7C24 4A71 A2D1 4A9A877781D0
469E471A 0380 4ACB BD50 EAE29660C495
17E4137F 8AE6 48AA A892 131006EEC3F7
5452ED63 2802 43EF AD2A 4F223C9549AD
73042E8F A24E 4F55 8E4E AAA0696657CE
B7C1AD55 3153 4634 B6E6 6BDB1EEFC18F
4728EF7D F3DE 4CB1 94C8 8E229DCC17A9
CD9C24DF 2514 4E0C B4C6 2842C7ED0A82
45AAC65D F728 4999 A625 758316B3490B

 

 



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4427
06/12/2021 11:44 am  
Posted by: @nigel42

@derek-m hi, Here's my set up in photos.

 

Other factors which might help you. 

3 bedroom semi detached 130m2 

recent refurbished house, lots of insulation! 

No Gas

UFH to ground floor, no rads.

Electric rads in bedrooms . Electric UFH in 2 shower rooms.

4.62kw solar panels

Hi Nigel,

I think Colin has kindly provided details of how to adjust the DHW settings in an earlier post.

I was surprised to read that you have electric radiators in the bedrooms and electric UFH in the shower rooms, seems strange if you have an ASHP.



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
06/12/2021 12:16 pm  

@derek-m hi, we went for Electric rads because we don't like too hotter bedrooms and just turn them on and off was as when needed. What would you have fitted? Curious to know!

What temp would you recommend for the DHW?

 

thanks again.



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4427
06/12/2021 3:15 pm  

@nigel42

Hi Nigel,

From the energy consumption and hence running cost point of view, even in Winter an ASHP would be approximately 3 times more efficient than direct electrical heating. If you are not using the electrical heaters very often then they should not be too expensive to run.

DHW in the 45C to 50C range should be adequate. It very much depends on your personal preference, the size of your tank, and how much hot water you use. About once per week your system should carry out a Legionella Cycle, heating the hot water to 60C -65C for at least 10 minutes.



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
06/12/2021 8:01 pm  

@derek-m hi, our tank is 300L and there is only 2 of us, only showers and the UFH are the main users of the water. I've just reduced the DHW from 50 to 48! 

Is there something else I should be looking at?

 

Thanks



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4427
06/12/2021 8:25 pm  

@nigel42 

Hi Nigel,

I am trying to get my head around how your system is actually being controlled, since according to your photo's, you appear to have the main Vaillant controller, plus what I think is the Vaillant remote controller, also at least 2 Heatmiser thermostats and a Heatmiser unit that may be for the UFH.

Did the installer give you any instruction as to what all the different controls are doing, and how they may interact with one another?

Would it be possible for you to list where each of the above devices are located, and they appear to be controlling.


This post was modified 4 years ago by Derek M

   
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