Description
The Trane SWT3980 is an OEM replacement L115-10F limit switch engineered to protect furnaces and heating systems from dangerous overtemperature conditions. As a critical safety component, the limit switch monitors heat exchanger or plenum temperatures and interrupts the burner circuit when temperatures exceed the rated setpoint, preventing equipment damage and potential fire hazards.
How It Works
The L115-10F designation identifies this switch’s operating parameters: the switch opens (trips) at 115°F to shut down the burner, and resets (closes) at approximately 105°F once safe temperatures are restored. This automatic reset design allows normal system operation to resume without manual intervention once the overheat condition has cleared.
Key Features
- OEM Trane replacement part — direct fit for compatible Trane heating equipment
- L115-10F rating: opens at 115°F, 10°F differential reset
- Automatic reset operation for convenient, reliable protection
- Interrupts burner circuit on overtemperature to prevent equipment damage
- Designed for use in furnaces and forced-air heating systems
- Durable construction for long service life in demanding HVAC environments
Application
The SWT3980 is a genuine Trane replacement limit switch intended for use in compatible Trane furnaces and air handling equipment. Always verify compatibility with your specific model before installation. Proper limit switch function is essential to safe furnace operation — a faulty or bypassed limit switch can result in overheating, heat exchanger damage, or fire risk.
Installation Notes
- Disconnect power to the unit before servicing
- Match wiring connections to original switch terminals
- Consult Trane equipment documentation for mounting location and orientation
- Test system operation after replacement to confirm proper limit function
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