Manufacturer Lennox Model # EL16XC1-060230A02 Serial # 5820B02991 Performed a preventative maintenance on a unit with two evaporator coils and one condenser. The split temperature is 19. Took a amperage readings of the condenser fan motor and compressor both are operating properly. The capacitor and contactor are both operating. Changed customer supply 16x25x4 filter. System is operating properly at this point.