Sarah has recently posted on the same issue Samsung R32 ASHPs - when is a defrost not a defrost?
Our HP runs for long periods as the heat demand is high. At least cycling isn’t an issue! But if the ufh control system registers all zones satisfied then the ufh powers down and everything goes quiet. Now this doesn’t usually last for long, so I don’t think the antifreeze protection kicks in much, if at all. EXCEPT when the zone night setback temperature reductions occur. This is often accompanied by a switch off of the HP, as the zones are satisfied. Elec use can be starkly reduced if ambient temperature is above freezing. But not nil… and I have been wondering why not. This protection run maybe the cause - and would be the reason for previously unexplained low temps in the dhw area of the tank, when they shouldn’t have done. I thought it was poor stratification of the heat store - but this frost protection would cause that. Why would Samsung run it from the dhw? And why is it not possible to change it?? 