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ASHP low UFH temperature

 
Air Source Heat Pumps (ASHPs)
Last Post by Derek M 3 years ago
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 Dancharris
(@dancharris)
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Joined: 3 years ago
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Topic starter 06/03/2021 8:52 am  

Hello, I have Daikin ASHP which runs my hot water and underfloor heating. End of last year I had the unit serviced and gas changed and during the last few months the heating doesn’t heat up above 19degrees during the cold periods.

Somebody mentioned to me that If the gas was not correctly removed (mode 21) the system could have to much refrigerator gas and could be the issue why the underfloor heating is not heating sufficiently.

Has anybody heard of this as a possible issue?


   
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 Bob@Lochinver
(@boblochinver)
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138 kWhs
Joined: 3 years ago
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06/03/2021 12:31 pm  
Posted by: @dancharris

Hello, I have Daikin ASHP which runs my hot water and underfloor heating. End of last year I had the unit serviced and gas changed and during the last few months the heating doesn’t heat up above 19degrees during the cold periods. ?

Hi @dancharris Have you went back to the people that did the service and asked them for if they have any thoughts ? I would think just doing a service should at the very least make it run at its best performance and not degrade the service. Wonder if they used the right type of gas ? 


   
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 Dancharris
(@dancharris)
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Topic starter 06/03/2021 2:13 pm  

Hi, they have used the correct gas, I have them coming back to next week to check everything again.


   
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 Derek M
(@derek-m)
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Posts: 4165
07/03/2021 10:33 am  

Hi Dancharris,

I remember watching a Youtube video recently (an American guy, though he seemed to know what he was talking about), where the problem with an ASHP was found to be too much gas, rather than too little.

Could I ask why you had the gas changed?

There are different refrigerant gases in use, but I have not investigated the differences and whether it would affect operation if the wrong gas is installed.

Regards,

Derek.

 


   
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