Description
Lennox 59W45 L150-40F Limit Switch Overview
The Lennox 59W45 is an OEM replacement L150-40F high-limit switch engineered to protect furnaces and heating systems from dangerous overheating conditions. When supply air temperatures exceed the rated set point, this limit switch interrupts the burner circuit, shutting down the heat source before damage can occur. Once temperatures return to a safe operating range, the switch automatically resets, restoring normal system operation.
Key Features
- OEM Lennox replacement part — SKU 59W45
- L150-40F designation: opens at 150°F, resets approximately 40°F below open point (~110°F)
- Automatic reset operation for convenient, reliable performance
- Designed to interrupt burner operation upon high-temperature detection
- Direct OEM fit for compatible Lennox furnace and heating equipment models
- Helps prevent heat exchanger damage and potential fire hazards
Application
This limit switch is a critical safety component in Lennox furnaces and air handlers. It monitors supply air or heat exchanger temperatures and acts as the last line of defense against overheating. Proper limit switch function is essential for safe, code-compliant furnace operation and protects both the equipment and the building occupants.
Installation Notes
- Intended as a direct OEM replacement for Lennox systems specifying the 59W45 / L150-40F limit switch
- Always verify compatibility with your specific Lennox model before installation
- Installation should be performed by a qualified HVAC technician
- Disconnect power to the unit before servicing or replacing any safety controls
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