Replaced a Daikin model air conditioner. First, safely recovered the existing refrigerant using a recovery machine. Disconnected the old unit from electrical and refrigerant lines. Installed the new Daikin unit, reconnecting electrical wiring and refrigerant lines. Evacuated the system to remove air and moisture, then recharged it with R-410A refrigerant. Tested the system for leaks and ensured optimal cooling performance. Verified that all settings were within manufacturer specifications.