Problematic Samsung Gen6 Defrost Cycle

[Timbones (Tim)]

Related topics about this same issue:

Samsung R32 ASHPs - when is a defrost not a defrost?

I wonder whether we Samsung users have been conflating two controller algorithms… Samsung tell us that real defrosts are subject to the following defrost strategy: [Screenshot 2024-12-31 at 17-37-05 Microsoft PowerPoint - TM EHS(R32)_Control Logic_EU_EN_2019_Ver1.1.pptx - EHS Defrost.pdf] You will see that this implies that a defrost cycle starts when the R32 temperature leaving the EEV is at or below -6degC, and stops when various other parameters combine/apply. This starts the compressor, …

Daikin: Defrost cycle pulled heat from DHW

Here’s an odd one. I have dhw set on “comfort” from 3am to 7am to take advantage of off peak tariffs. This morning was my first proper defrost since install in April last year and it appears to have opened the three port valve to take heat from the dhw. Tank temperature dropped from 50 to 44 degrees. [459306052_10162439818018109_2504099600393747679_n] I’ve never seen this before, any ideas what’s going on here? Link to my emoncms if you want to look in detail: https://myheatpump.uk/app/v…