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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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 witchcraft
(@witchcraft)
Estimable Member Contributor
Joined: 5 years ago
Posts: 91
07/12/2021 4:31 pm  

@derek-m Good point, though as there is always an obvious correlation between wind direction and outside temperature - it obviously has an effect.  Lots of variables for this simple electronics technician (retired) to understand!  



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
07/12/2021 4:34 pm  

@derek-m its the model that colin posted below at 1.35pm. FYI



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
07/12/2021 4:35 pm  
Posted by: @kev-m

@derek-m 

Actually, now you mention it, yes. I didn't change anything from yesterday and the house was 21.5C yesterday evening.  I thoight about moving the curve down but didn't.  Rads were 35 or so as I remember checking them. It's now about 20C now and rads are still 35C.  So my very unscientific conclusion is that I could be losing 1C or so because of the 30mph winds and rain.

I feel a log fire coming on this evening ... 🙂 

Thanks for that Kev,

With auto adaptation your system would have probably raised the water flow temperature to 36C to compensate.



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
07/12/2021 5:15 pm  

@nigel42 

Hi Nigel,

Sorry that I did not get back to you earlier.

I'm afraid that I am having to make quite a few assumptions as to how your system may or may not be configured and operating.

Obviously, the two Heatmiser thermostats (one in the living room? and one in the kitchen?) are opening and closing the valves for the UFH and probably switching on and off the associated water pump. Whether signals are also fed to the Vaillant controller from the thermostats directly or via the Heatmiser hub is something that you may be able to clarify.

Your ASHP is controlled by the Vaillant controller, I assume, the one with the screen with the 4 pushbuttons underneath, that appears to be located in your airing cupboard/utility room. Unfortunately the photo is not very clear, and I cannot see whether it is operating in water flow control, weather compensation control, or room temperature control. Could you please clarify?

Where is the VRC720 (760) unit located?

Could you please identify the unit with the 4 pushbuttons beneath the screen so that I can ensure that I have the correct manual?

 

 



   
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 Derek M
(@derek-m)
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Joined: 5 years ago
Posts: 4425
07/12/2021 5:38 pm  

@nigel42 

Hi Nigel,

You may find this manual of use if you do not have a copy.

vrc-700-operating-instructions-1968310.pdf



   
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 Colin
(@colin)
Trusted Member Member
Joined: 4 years ago
Posts: 56
07/12/2021 5:48 pm  

@derek-m Don't forget the link Derek 😉 

VAILLANT.CO.UK "https://www.vaillant.co.uk/downloads/product-manuals/vrc-700/vrc-700-operating-instructions-1968310.pdf"



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
07/12/2021 5:56 pm  
Posted by: @colin

@derek-m Don't forget the link Derek 😉 

VAILLANT.CO.UK "https://www.vaillant.co.uk/downloads/product-manuals/vrc-700/vrc-700-operating-instructions-1968310.pdf"

Thanks Colin,

I'm afraid I did forget the link. One of the pleasures of growing older. I have read through so many posts over the past months, that I find it difficult remembering what I said, let alone remember what was said by others.

I tried to attach the actual document, but for some reason the forum refused my request. 



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
07/12/2021 6:42 pm  
Posted by: @derek-m

@nigel42 

Hi Nigel,

Sorry that I did not get back to you earlier.

I'm afraid that I am having to make quite a few assumptions as to how your system may or may not be configured and operating.

Obviously, the two Heatmiser thermostats (one in the living room? and one in the kitchen?) are opening and closing the valves for the UFH and probably switching on and off the associated water pump. Whether signals are also fed to the Vaillant controller from the thermostats directly or via the Heatmiser hub is something that you may be able to clarify.

Your ASHP is controlled by the Vaillant controller, I assume, the one with the screen with the 4 pushbuttons underneath, that appears to be located in your airing cupboard/utility room. Unfortunately the photo is not very clear, and I cannot see whether it is operating in water flow control, weather compensation control, or room temperature control. Could you please clarify?

Where is the VRC720 (760) unit located?

Could you please identify the unit with the 4 pushbuttons beneath the screen so that I can ensure that I have the correct manual?

 

 

hi

yes the two heatmiser are in the locations you stated, and are opening and closing the valves for the UFH. I believe the signals are fed via the heatmiser hub.

 

the VRC720 is located in the hallway.

the unit in the utility room is a Vaillant heat pump control VWZ AI (photo attached) 

I've also attached a photo (sorry about the lighting on it) of the current display.

61268059 4F1C 4B9C BBD5 7633CD9B09CB
6D797811 B852 424B BE25 640787136435

hope this helps

 



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
07/12/2021 6:42 pm  
Posted by: @colin

@derek-m Don't forget the link Derek 😉 

VAILLANT.CO.UK "https://www.vaillant.co.uk/downloads/product-manuals/vrc-700/vrc-700-operating-instructions-1968310.pdf"

Hi Colin,

Maybe you can help. I have read all the way through this document that is titled 'Weather-compensated system control', but can find nothing relating to weather compensation other than it is mentioned on page 4.

I am assuming that the actual setting of the weather compensation parameters is done elsewhere, can you throw any light on this?



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
07/12/2021 6:49 pm  

@nigel42 

Hi Nigel,

Could you please provide a readable closeup of the VWZ AI unit screen.

Is the display on the VRC720 showing consumed electrical energy or produced heat energy? Maybe you could provide a list of the status information that is available.



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
07/12/2021 6:50 pm  

got a better photo of the display !!

E4D57506 E850 4C48 8E61 47FA255B2E42

 



   
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 Nigel42
(@nigel42)
Trusted Member Member
Joined: 5 years ago
Posts: 32
07/12/2021 6:51 pm  

got a better photo of the display !!

E4D57506 E850 4C48 8E61 47FA255B2E42

 



   
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