always verify your specific Lennox sensor lead compatibility via the unit’s parts list before installation

meeting stringent safety standards for North American HVAC systems

Check your specific Maxitrol spring selection chart to ensure the physical dimensions match your regulator's internal tower

Utilizing a genuine Lennox part ensures that the calibration matches the original factory response times

York S1-2940-3551 Relay always verify your specific LennoxThe York S1 2940 3551 Relay is a specialized 24V 3 pole plug in heat relay engineered for precise switching in residential and light commercial HVAC systems. This HVAC contactor relay functions as a critical interface between low voltage control circuits and high voltage heating components, ensuring reliable load management. Designed for 24VAC coil operation, the S1 2940 3551 features a robust 3 pole configuration that allows for multi circuit control