Lennox 99M99 Pressure Switch 318423-701 Designed as the direct replacement

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

allowing for seamless communication between the thermostat and the blower motor

though field adjustment of the sensitivity screw may be required to compensate for paddle weight

minimizing contact pitting and ensuring clean arc suppression

Lennox 99M99 Pressure Switch 318423-701 Designed as the direct replacementAs 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),