Removed old equipment and installed new Rheem 3 ton r-454b a/c with 3 ton evaporator coil and 80% gas furnace. Installed new media filter cabinet with 16x25x4 filter, new emergency drain pan, new pan safety switch, new coil safety switch, new condensation pump, new thermostat, new surge protector and new composite pad for outdoor unit. Reconnected supply plenum, return plenum, high voltage, low voltage, drain line, gas line and vent pipe. Tested system operations in heating and cooling, set refrigerant charge.