Aprilaire #56 Humidistat

• For use with Aprilaire models 110, 112, 220, 224, 400, 440, 445, 445A, 448, 500, 550, 550A, 558, 560, 560A, 568, 600, 700, 760, 760A and 768.<
• The Aprilaire Auto Trac humidifier control is computer-equipped, completely automated and will never need manual adjustments.
• The advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level.

Had one of these units prematurely quit, not triggering the Aprilaire humidifier. Aprilaire technical reps were great assisting to determine the problem of the humidifier not working, which was the humidistat. Unfortunately, it was out of warranty, so had to purchase. Mechanical and electrical installation was simple. Worked at start-up, and has been doing fine since. Do hope it lasts longer than the last one, though. They are not cheap.

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