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Midea ASHP – how to set weather compensation

 
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Air Source Heat Pumps (ASHPs)
Last Post by pash44pump 1 minute ago
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 pash44pump
(@pash44pump)
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Joined: 5 days ago
Posts: 6
02/09/2025 9:42 am  

@jamespa thank you. You may well be correct regarding the downstream system being the issue. I can do what you suggest but my question - is this a test that will tell us what we need to know if the external temperature is currently 16C? I know the ASHP can produce sufficiently hot water in warmer temperatures but the problem arises in cold weather. I had a dialogue with the installer earlier this year when house was below desired temperature. At that time it was -1C outside. The Midea controller was set to 55C and the inlet/outlet temperatures were 38/34 so an enormous discrepancy. At 5C they were 46/41 and at 10C later in the month they were 50/46. These are the readings from the heat pump. Obviously the temperatures at the UFH manifolds were lower than those readings. 

I'm happy to try what you suggest though if you think that will give us useful information. How do I measure the temps on the four ports of the buffer (sorry don't know what that means). By measure temps at beginning of UFH loops do you mean as shown in attached photo where I have one of these gauges for each loop (so 2 of these

WhatsApp Image 2025 01 09 at 11.29.11

and one for each room?

On a different point, if I have UFH and rads then leaving the rads on in winter means I am running my ASHP at a flow temp of 55C. Doesn't that make the COP really inefficient? The rads are all in upstairs rooms that aren't used in winter. 

Thanks in advance



   
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