Performed preventative maintenance on Carrier AC system. Replaced 14x30x1 air filter. Tested evaporator coil pan and condensate line for proper drainage. Temperature split was 6°. Connected gauges and have a low side psi of 66 and a high side psi of 226. This unit needs a refrigerant charge. Quoted the customer for easy seal and dye and 4 lbs of R-410A refrigerant. Both compressor and condenser fan motor are within the rated amperage for this unit. Performed work and not the unit has the proper refrigerant charge. System is operating properly at this time and is ready for the summer season. ***Office set up leak investigation 4 weeks from today.****