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Air Source Heat Pumps (ASHPs)
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 Grantmethestrength
(@grantmethestrength)
Reputable Member Member
Joined: 9 months ago
Posts: 143
13/11/2025 3:24 pm  

Posted by: @grahamf
↑

Your system is constantly cycling, but fortunately the frequency of cycling is not very high.  Have you tried lowering the weather compensation curve to try to reduce the cycling?

My system design was 45c @ -3c which was way too hot for us. I slowly adjusted it down as we went through the end of last heating season to 32c @ -3c OAT on the other end it is 23c (the lowest the unit will go to) @ 20c OAT (I did have this at 16c as we really don't need heat when it is about 16c outside, but having seen other peoples settings I thought I would try 20c. I was hardly getting any DeltaT maybe 1-2c but the house was warm. I have just changed over to medium pump speed and holy cat poop Batman, Grant don't do things by half! my flow rate is now 37 l/min. I will monitor it and see what that has done if anything (well apart from doubling the power consumption of the pump!!).

I get what you are all saying about the cycling which I am not too concerned about as it is still mild out, even here in Pembrokeshire, and it is not being caused by defrosts which is a good thing. I may have a look at using night mode to throttle the compressor (if that is the right word to use) maybe limit it to 75% see where that gets me. 

 


Kind Regards
Si
——————————————————————————
Grant Aerona3 13kW
13 x 435w + 13x 480w Solar Panels
Sigenergy 10kW Inverter
16kW Sigenstor battery


   
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