Installed new 4-ton Carrier gas system. Installed new Ecobee Pro 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. Built a transition to existing trunk line supply plenum and sealed with mastic airlock. Installed an Aprilaire filter. Installed surge protectors for both indoor and outdoor units. Replaced disconnect and whip at the outdoor condensing unit. Charged system to factory spec. System is working properly at time of departure.