Upon my arrival I performed HI2B, replacement of refrigerant pressure control. I pumped the system down, removed the faulty refrigerant pressure control, installed a new one, new inline filter dryer, purged with nitrogen while brazing and put the system under a pressure test. Once the pressure test was good I evaluated the nitrogen and put the system under vacuum. While obtaining the proper microns under vacuum I resealed the case coil, put fresh pipe dope on both the float safety switch and drain line before reinstalling them. I installed a new piece of Armaflex on the suction line. Had to purge the system 3 times with nitrogen to remove any moisture inside the line set. Once the system was below 500 microns I released the refrigerant back into the line set and ran a performance and safety testing. Found that the system is operating properly in both the performance and safety aspects in f the equipment.