Upon arrival unit was off. Checked evap coil and saw a small buildup of ice. Took hot water and sprayed the coil until all ice was melted. Turned unit on and found the system was low on refrigerant. After getting customer authorization we chemically cleaned the condenser coil due to a high buildup of dirt and debris simulate higher pressures than the system actually had. Added 2 lbs 6 oz R410A to the system to bring the subcooling up to 13 from 1. Also added uv dye to the system. Pressures went from 75/270 to 130/366. Unit is working properly