Bryant 5 ton hp - compressor shorted, trips breaker. I installed warranty compressor today. Unit is 4 years old. Pulled deep vac - 13 lbs r22 on nameplate. It sucked up 6 lbs prior to start up. 70 degrees today, so I started up in the cooing mode, closed high side gage and proceeded to finish weighing in charge via suction port. Unit will not take more. Moreover, when I close low gage pressure sits steady at 100+ psi and does not drop - seems to be no suction. Head pressure is about the same, best I remember. Compressor is starting and pulling 11 amps. Compressor is getting very warm. Discharge line is pretty warm. I changed LL filter also. Unit is frosting at the suction valve (may be normal). Both valves are open. I never closed them, by the way. But I checked just the same. I suspected RV. Pulled disconnect and unplugged RV as it was still energized in the cooling mode. I did not hear it shift - no pressure relief - like I usually hear when one is de-energized. If I had bad expansion valve, unit would suck to zero. Any ideas?