Installed a Rheem RP1448AJ1NA two-zone central air conditioning system in a residential home. Mounted the 4-ton outdoor condensing unit on a concrete pad using Rubber-A-Mounts for vibration isolation. Ran two separate sets of refrigerant lineset piping to indoor evaporator coils located in the attic space - one for the living room and one for the master bedroom. Used existing ductwork and installed motorized zone dampers to control airflow to each zone. Evacuated the entire system to 500 microns using a Fieldpiece EVAC4WAY vacuum pump. Charged with 3 lbs 8 oz of R-410A refrigerant per Rheem's specifications. Programmed the Rheem AccuLink zoning control board and verified proper cooling operation in each zone.