Aprilaire 5558 Humidistat L99H008 OEM Precision: Direct replacement ensures

OEM Precision: Direct replacement ensures a perfect fit for the 1/2" bore

field-ready component designed for precise voltage regulation in residential and light commercial HVAC systems

5P specifications for exact OEM fitment in CBX25UH air handlers

Water-Resistant Design: Certified for IP24 rating

Over-application can lead to mess without improving thermal performance

Aprilaire 5558 Humidistat L99H008 OEM Precision: Direct replacement ensuresThe Aprilaire 5558 is a high performance Automatic Digital Modulating Control package engineered specifically for use with the Model 866 modulating steam humidifier. This modulating steam humidistat provides superior precision by utilizing a microcomputer based design and a proportional algorithm. Unlike standard on off controls, the 5558 delivers a 0 10VDC or 2 10VDC modulating output signal, allowing the humidifier to adjust its output based on the