I have an 06D compressor on a carrier heat pump. The oil in the compressor keeps pumping out and circulating through the system.The unit is not flooding and the insertion heater is good.
No matter how long the compressor runs the oil just keeps circulating through the system. If you leave your charging hose on the suction service valve for 10 minutes then remove it, you get a good blast of foamy oil. The suction pressure is 55 to 60 psi with a varying superheat of 14 to 20 deg at the compressor.
There is an identical carrier next to this unit with the same suction line length,size, rise etc. Two years ago i serviced this unit and the sight glass had oil, now you cant get any oil in the glass, even after adding.
Anyone have an idea whats pumping the oil out of the compressor and whats the soulution besides replacment?