Lennox Auto Limit Switch F with F Differential

The Lennox Auto Limit Switch line covers OEM auto-reset furnace high-limit switches (also called furnace limit controls or temperature limit switches). They protect Lennox furnaces and HVAC heating equipment from dangerous overheating.

Key Features:

• Auto-reset operation: the switch opens the control circuit when the sensed temperature reaches its set point. It closes again on its own once the temperature falls by the rated differential, so no manual reset is needed after a trip.
• Overheat protection: it interrupts the burner circuit when temperatures get too high. This helps protect the heat exchanger, blower assembly and other furnace components from thermal damage.
• Factory-calibrated set points: the open temperature and differential are set for consistent, repeatable performance.
• Genuine Lennox OEM design: it is engineered as a direct replacement for the original control in compatible Lennox equipment.

Each limit switch is identified by its open temperature and differential rating, such as an "L" designation followed by the open temperature and the differential in degrees Fahrenheit. This makes it easy to match the replacement to the original control. It suits HVAC technicians doing furnace maintenance, repair or component replacement in residential and light commercial heating systems.