Lennox 80K89 Limit Switch 320734-701 When performing a boiler burner

When performing a boiler burner teardown or a commercial water heater repair

Using it in larger bodies will result in incorrect outlet pressures

it is calibrated to open the electrical circuit if temperatures exceed the 215°F threshold and automatically reset once the system cools to 185°F

35" WC pressure switch

maintaining the original safety certifications and factory specifications of the appliance

Lennox 80K89 Limit Switch 320734-701 When performing a boiler burnerThe Lennox 80K89 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces. Engineered as a 150 180F AUTO Limit Switch, this L180 30F thermal cutout ensures the burner assembly shuts down if internal temperatures exceed the 180F threshold, preventing heat exchanger damage. Once the plenum cools by approximately 30F, the switch automatically resets, restoring normal furnace cycles. This Lennox