Installed new 4-ton Carrier gas system. Installed new Ecobee Lite. 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 airlock. Installed new high-density filtration. Replaced disconnect at the condenser. Charged system to factory spec. System is working properly at time of departure.