Installed Carrier 3.5-ton heat pump system. Installed Ecobee thermostat. Replaced secondary drain pan. Installed new supply and return plenums. Replaced satellite plenum with metal wyes. Sealed all connections with mastic air lock. Rebuilt primary drain line and cleared to ensure proper operation. Replaced disconnect and whip at outdoor condenser. Re-insulated the suction line and ran low voltage in 1/2 inch Seal-Tite. Pressure tested line set and pulled a vacuum. Weighed in additional refrigerant to meet manufacturer specifications.