What will cause high head even after doing the following. I wont go into all the reason's why some of this was done. The relevant issues to my question was that these things have been done and I still have high head pressure.
(1). (original service call)
Unit was just charged a week ago by another company but it has leaked down again. (determined indoor coil was leaking). Charged the unit up and ordered the new coil to put in tomorrow. When I charged the unit the suction pressure was 75 psi and head was 325 psi. 15 degrees superheat. I decided to go ahead and clean the condenser since I was putting a new evap coil tomorrow. Cleaned the coil and head pressure dropped to 310 PSI. Guess I've got non-condensibles in the system. Tomorrow I'll recover all the refrigerant and pull a good vacuum and take care of it then.
(2). Next day I changed the indoor coil. Pulled a lengthy vacuum. Changed the pump oil before pulling the vacuum. Doing this by the textbook.
(Summary) After all of this the unit is still running 310 psi head. 75 suction - Indoor temp at this time was about 87 degrees. Getting an 18 degree TD. 15 degree superheat at the condenser.
If suction pressure is ok and both coils are clean and good airflow at the vents what else could be causing this head pressure?
Any ideas are very much appreciated!