Hi Michal,
Your Samsung heat pump sounds really simple to understand.
I don’t have one but I have read all the posts.
You have two basic ways to run, with or without room temperature control and you can follow a weather curve if you want, Samsung call it water law.
If you use the room thermostat, either Samsung or third party the heat pump heats until the room reaches the requested temperature and then stops until the room cools down enough, then the heating starts again. The water flows at the temperature determined by the water law settings.
With no room thermostat then it just runs at a set flow temperature, again determined by water law.
If that flow temperature determined by the water law `curve’ is too low then the heat pump works in very short cycles and only stops for the minimum amount of time necessary to start heating again.
With no other changes the extremely short cycling can only be cured by increasing the flow temperature, that is increasing the water law `curve’
I think it really is that simple but I am sure somebody will point out anything that is wrong.
The flow temperature that you need to run at in pure water law mode without short cycles will probably produce more heat than you want at times and overheat the house.
That is because the minimum flow temperature required to prevent short cycling produces more heat than your house loses.
The only way to stop short cycling and keep the house temperature under control is to use the room thermostat or manually control the heat pump by turning it on and off yourself.
Pure water law is designed to run continuously but you need to select a flow temperature that is high enough for your radiators to deliver the heat produced.
Pure water law doesn’t work for you because you won’t run a high enough flow temperature to prevent short cycling but for some other people it may well work, I could live with it if I had to, it is what I do. But you don’t want to do this.
That is it, I don’t think it is any more complicated than this.
As I said, somebody will point out any errors.