PSAM line sets simplify retrofitting older R22 systems to modern R410A or R32 mini splits when new copper

https://wiki-room.win/index.php/AC_Unit_Line_Set_Replacement:_When_and_Why_to_Do_It

PSAM line sets simplify retrofitting older R22 systems to modern R410A or R32 mini splits when new copper and correct sizing are required by manufacturers.