Lennox 99M99 Pressure Switch 318423-701 including the Reznor B series

including the Reznor B series

this HVAC manifold assembly provides the structural integrity needed to withstand thousands of heating cycles without sagging or failing at the weld points

Designed as the direct replacement for FS4-3S-E

The internal pressure-balanced design utilizes high-quality rubber sealing diaphragms to achieve stability against water pressure fluctuations while protecting the range spring from sedimentation and corrosion

Lennox 99M99 Pressure Switch 318423-701 including the Reznor B seriesAs a service ready high pressure switch for diagnostic and repair calls, the Lennox 99M99 is a critical safety component designed for high side refrigerant monitoring. This genuine Lennox replacement part is engineered to actuate at 590 PSI and features an automatic reset at 418 PSI, ensuring the compressor is protected against catastrophic over pressure conditions common in R 410A systems. Built with 106 inch leads and rated for 120 240 VAC (375 VA),