Removed old equipment and installed new Rheem 14 seer 3.5 ton full gas system. Installed new return plenum with 20x25x1 filter, new emergency drain pan, new pan safety switch, new coil safety switch, new composite pad for outdoor unit and new surge protector. Reconnected supply plenum return box, high voltage, low voltage, drain line, gas line, and vent pipe. Tested system operations in heating and cooling, set proper charge.