System 4 - Compressor Replacement. Tech pulled vacuum on system and charged with 5lbs and 7oz of R410A, factory charge is 8lbs. Rewired compressor wires and reconnected all other wiring. Will need to return to further diagnose low voltage short due to it blowing low volt fuse as soon as power was turned on. OD Disconnect had 2- 15amp blown fuses, replaced with 2- 30amp for the time being but will need 2- 15 fuses(small ones). Tech finished up charging the system with 3lbs of 410a refrigerant. and corrected the low voltage challenge. Short at the Reversing valve wire was identified. System #4 is back cooling. 30amp fuses at the outdoor unit will be needed to be replaced with 15amp fuses(small fuses).