Cut in humidifier module. Piped to return duct. Cut in and finished pipe. Attached water line and open it to water heater, no leaks found. Wired and installed control. Wired up transformer to line power. Wired to terminal strip of furnace. Ran and attached drain line. Tested humidifier. System operating normal at this time. Furnace clean and tune. Cycled system. Checked her exchanger, ok. Checked and cleaned burners and flame sensor. Checked for CO in airstream, none found. Checked and found normal levels of XS air and CO in exhaust. System operating normal at this time. Job complete.