Completed installation of Liberty 1.5-ton split system air conditioner. Set 18,000 BTU outdoor unit on vibration-dampening pad. Installed matched evaporator coil in air handler. Brazed refrigerant lines using nitrogen purge to prevent oxidation. Evacuated system to 500 microns and charged with R-410A to manufacturer specifications. Wired low-voltage connections and verified proper communication between thermostat and system components. Conducted startup sequence and confirmed 18-20°F delta T across evaporator.