Installed new 3-ton Carrier gas system. Installed new Ecobee thermostat. Rebuilt and insulated condensate drain line. Cleared and treated drain. Replaced secondary drain pan. Installed SS2 & SS3 float switches. Installed new filter dryer, pressure tested with dry nitrogen and pulled a vacuum on the copper line set. Replaced both supply and return plenums and sealed with mastic air lock. Replaced master bedroom grilles. Spliced on new 18” duct to the other system return for better walkway. Charged system to factory spec. System is working properly at time of departure.