Description
The Lennox 11W50 is an OEM-grade high-limit control designed to protect furnace heat exchangers and system components from damaging overtemperature conditions. With a trip temperature of 170°F and a reset temperature of 140°F, this limit control automatically interrupts the burner circuit when supply-air temperatures exceed safe operating thresholds, then resets once temperatures return to the normal operating range — providing reliable, repeatable protection cycle after cycle.
How It Works
The limit control continuously monitors air temperature within the furnace plenum or heat exchanger area. If temperatures rise above the 170°F setpoint — due to restricted airflow, a dirty filter, or a blower fault — the control opens the burner circuit to prevent damage. Once the system cools to 140°F, the control automatically resets, restoring normal furnace operation without manual intervention.
Key Features
- OEM Lennox replacement part — direct-fit for compatible Lennox furnace models
- Trip (open) temperature: 170°F
- Reset (close) temperature: 140°F
- Automatic reset operation for convenient, hands-free recovery
- Protects heat exchangers and furnace components from thermal damage
- Interrupts burner circuit on overtemperature to prevent unsafe operation
- Compact design for easy installation in tight furnace cavities
Applications
- Lennox residential and light commercial gas furnaces
- Replacement of failed or out-of-spec OEM limit controls
- Preventive maintenance and safety system restoration
Why Use an OEM Limit Control?
Using the correct OEM-specified limit control ensures the furnace operates within manufacturer-approved safety parameters. An improperly rated limit control can allow unsafe temperatures to persist or cause nuisance shutdowns — both of which compromise comfort, efficiency, and equipment longevity. The Lennox 11W50 delivers the precise trip and reset points your system was engineered to rely on.
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