Removed old equipment and installed new Rheem 4 ton duel fuel system. Installed new return plenum with 20x25x4 filter, new supply plenum, new emergency drain pan, new pan safety switch, new coil safety switch, new zone dampers, new 8” bypass, new zone board, 2 new thermostats, and new composite pad for outdoor unit. Reconnected high voltage, low voltage, drain line, gas line, vent pipe, supply ducts and all return ducts. Ran zone damper tests, tested system operations in heating and cooling, set proper charge.