In order to have the coolers temp at 34. While the system is running, the refrigerant temp in the evap would generally be at 24, so 32 suction pressure while running. The liquid line pressure would also need to be higher then the saturation temp of the outdoor ambient, so liquid line pressure would be at least 254. But 290 would not be out of line on some condensers, varying with location outside.So referring to David40 original post to his 34 degree indoor and 80 degrees outdoor does not correlate 63/290 on the PT Chart? It would be more like 75/173 psi? Im just making sure Im doing this right so that I don't get confused.