Performed preventative maintenance on Lennox AC system. Changed MERV 11 16x25x5 air filter provided by the customer. Tested evaporator coil pan and condensate line for proper drainage. Temperature split is at 21° with a supply air temperature of 45°. This unit has an accurate refrigerant charge. Compressor- 5.7 RLA Condenser fan motor- 0.7 FLA. Both of these readings are within the amperage rating for this unit. System is operating properly at this time and is ready for the upcoming season.