Lennox 74W77 Limit Switch R-410A this single-stage SPDT control provides

this single-stage SPDT control provides a wide regulation range from -40°F to 212°F

always verify the current heater's continuity during the replacement process

and BT1420035

Does this assembly include the sensing bulb and mounting hardware

optimizing the regulator for variable inlet pressures up to 125 psig while maintaining stable outlet pressure under shifting load demands

Lennox 74W77 Limit Switch R-410A this single-stage SPDT control providesThe Lennox 74W77 Limit Switch is a critical OEM safety component engineered for precise thermal regulation within Lennox furnaces and air handlers. This L155 30F limit switch is calibrated to open at 155F and automatically reset when the temperature drops by 30F, preventing heat exchanger damage and ensuring safe operational cycles. Designed as a direct Lennox 74W77 replacement, this high limit control utilizes a bimetal sensing element to monitor