Installed a new TemPStar NXA648GKD 4 ton air conditioner today. Properly located and level-mounted condenser on concrete pad per specifications. Matched existing evaporator coil with new piston and new THX-BBD expansion device. Ran new lineset with proper insulation and made brazed connections. Evacuated entire system to 500 microns using a Fieldpiece EVAC vacuum pump. Charged with TemPStar-specified R-410A refrigerant weight for this model. Tested operation - system is performing to rated efficiency with proper superheat and subcooling values.