Linear Control: Provides predictable flow modulation for accurate HVAC zoning and energy efficiency

Can I use this to replace part 86W18

For contractors performing HVAC repair on 90%+ AFUE systems

The manual reset requirement ensures that a qualified HVAC technician evaluates the system to prevent repeated overheating which could lead to equipment failure

this fixed orifice assembly is designed for the management of both liquid and gas flow

Aprilaire 5558 Humidistat 326070-701 Linear Control: Provides predictable flowThe 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