Description
The Lennox 57W37 is an automatic reset limit switch engineered to protect furnace heat exchangers and components from dangerous overheating conditions. Designed as a direct OEM replacement for compatible Lennox heating systems, this limit switch features a 3″ insertion depth and operates within a 140–170°F temperature range, making it well-suited for residential and light-commercial forced-air furnace applications.
How It Works
The auto limit switch continuously monitors supply-air or heat exchanger temperatures. When temperatures exceed the upper set point, the switch opens the control circuit, shutting down the burner to prevent equipment damage and potential fire hazards. Once temperatures fall back within the safe operating range, the switch automatically resets — eliminating the need for manual intervention and minimizing system downtime.
Key Features
- OEM Lennox replacement part — SKU 57W37
- Operating temperature range: 140°F to 170°F
- 3″ insertion depth for proper heat exchanger mounting
- Automatic reset design for convenient, hands-free recovery
- Protects furnace components from overheating damage
- Direct drop-in replacement for compatible Lennox furnace models
Application
- Residential and light-commercial forced-air furnaces
- Compatible with select Lennox furnace product lines
- Ideal for service technicians performing OEM-spec repairs
Why Choose the Lennox 57W37?
Using a genuine Lennox OEM limit switch ensures proper fit, reliable performance, and maintains the integrity of your heating system. The 57W37 is a trusted solution for HVAC professionals who demand precision and dependability in every repair.
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