3-20-19. Removed old humidifier. Installed new aprilaire 600 humidifier. Connected bypass. Connected water line. Ran outdoor sensor. Wired system. Tested humidifier. Running properly. Performed the furnace start up. No gas leaks detected. Gas and exhaust levels are normal. No CO detected in the air. Heat rise was 43 degrees. High limit passed the safety check. Unit is heating properly. Thank you for choosing Black-Haak heating.