Standardized Fitment: Four-hole ASME flange ensures a secure

including popular C6BA-X and C6BH-X indoor cased coil models

the unit includes integral check valves and filter washers to prevent cross-flow between supply lines

including 1/2" and 3/4" B1H and B1X models

monitoring internal heat levels to prevent heat exchanger damage

Lennox 74W77 Limit Switch 326058-756 Standardized Fitment: Four-hole ASME flangeThe 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