Performed cooling season preventative maintenance on Carrier 24APB6 Performance Series condensing unit and FV4C air handler. Checked refrigerant charge by measuring subcooling and superheat values. Cleaned condenser coils with approved flush solution. Inspected electrical connections, capacitors, contactors. Tested all operational modes including two-stage cooling. Replaced air filters and rinsed condensate drain line. Cycled system to ensure proper operation within Carrier's rated tolerances.