Installed Carrier 90% gas furnace. Installed propane conversion kit. Installed Ecobee Pro thermostat. Installed new supply and return plenums. Sealed all connections with mastic air lock. Removed smaller satellite return flex and ran straight into main return for the system. Installed new secondary drain pan and installed SS2 and SS3 safety float switches. Rebuilt and insulated primary drain line. Cleared drain and verified operation.