Installed 4 ton R-454B down flow system. Payne condenser and mobile home air handler. New disconnect and pad for the condenser. Installed Honeywell T6 thermostat. Cleaned out the closet where the air handler sits. Ran all new primary condensation drain. Tested drain operation with water. Pressure tested system with nitrogen and pulled vacuum. Charged AC with R-454B refrigerant. Replaced 45/5 capacitor at the condenser. Tested heating and cooling operation of new system. Everything is working at completion of install.