Description
Lennox 57W38 Auto Limit Switch Overview
The Lennox 57W38 is an automatic reset limit switch engineered to protect furnaces and heating systems from overheating conditions. Designed as a direct OEM replacement for compatible Lennox equipment, this limit switch monitors supply-air temperatures and automatically interrupts the burner circuit when temperatures exceed the safe operating threshold — then resets automatically once conditions return to normal.
Key Features
- Temperature range: 150°F to 180°F operating limit
- 3″ insert mount for straightforward installation into the heat exchanger plenum or duct
- Automatic reset operation — restores normal function once temperature drops to a safe level
- OEM Lennox replacement part for compatible furnace models
- Provides reliable overheat protection to safeguard equipment and occupants
Application
The 57W38 limit switch is intended for use in Lennox gas furnaces and heating systems requiring a 3″ insert-style limit control. It interrupts burner operation when supply-air temperatures rise above the set limit, preventing heat exchanger damage and potential fire hazards. The automatic reset feature minimizes service calls by restoring normal operation once the over-temperature condition clears.
Installation Notes
- Verify compatibility with your specific Lennox furnace model before installation
- Designed for 3″ insert mounting — confirm plenum or duct wall thickness matches
- Always de-energize the system before installation or service
- Consult the equipment service manual for wiring and mounting instructions
Why Choose the Lennox 57W38
Using a genuine Lennox OEM limit switch ensures proper fit, accurate temperature calibration, and long-term reliability. The 57W38 delivers the precision overheat protection your Lennox system was designed for, helping maintain warranty compliance and peak system performance.
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