Performed Air Conditioning Tune Up on Comfortaker/NCP system. Checked electrical connections and tested capacitors. Measured voltage and amp draw on system. Cleaned drain line and ez trap. Poured water through drain pipe to make sure it was draining correctly. Checked the EZ trap safety to test that it was shutting the system. Replaced the 16x20x11 Air Filter. Put system in cooling mode and measured refrigerant charge, static pressure, and temperature delta.