Description
The Lennox 56W20 is an OEM-grade automatic-reset limit switch engineered to protect furnaces and heating systems from unsafe operating temperatures. Designed as a direct replacement for compatible Lennox equipment, this limit switch monitors supply-air or heat-exchanger temperatures and automatically interrupts the burner circuit when temperatures exceed the rated threshold — then resets itself once safe operating conditions are restored.
Key Features
- Auto (automatic) reset operation — no manual intervention required after trip event
- Operating temperature range: 120°F to 150°F
- OEM Lennox replacement part (SKU: 56W20)
- Protects heat exchangers and furnace components from overheating damage
- Interrupts burner operation upon high-limit condition, restoring normal function once temperatures normalize
- Direct drop-in replacement for compatible Lennox furnace models
How It Works
The limit switch continuously monitors the temperature within the furnace air plenum or heat exchanger. If temperatures rise above the 150°F set point, the switch opens the control circuit, shutting down the burner to prevent equipment damage or fire hazard. Once temperatures fall back to the safe range (120°F), the auto-reset mechanism closes the circuit and allows normal operation to resume — making it ideal for applications where nuisance manual resets would disrupt system performance.
Application
- Lennox residential and light commercial furnaces
- High-limit overheat protection in forced-air heating systems
- Direct OEM replacement for Lennox 56W20 limit switch
Why Choose the Lennox 56W20?
Using genuine OEM or OEM-equivalent limit switches ensures proper calibration, reliable trip points, and compatibility with Lennox control boards. Substituting non-rated components can result in nuisance trips, equipment damage, or voided warranties. The 56W20 delivers the precision and dependability that professional HVAC technicians demand.
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