Manufacturer Lennox Model # XC14-041-230-02 Serial # 5812D02021 Completed a preventative maintenance on a older Lennox unit. Took a split temperature it was 20. Performed a amperage readings on the condenser fan motor and compressor both are operating properly at this time. Changed the 16x25x1 filter. Cleared out drain line. System is operating properly properly at this point.