Description
The Trane SWT3985 is an OEM replacement L150-30F high limit switch engineered to protect furnaces and air handlers from dangerous overheating conditions. When supply air or heat exchanger temperatures exceed the rated setpoint, this limit switch interrupts the burner circuit, shutting down the heating system to prevent equipment damage and potential safety hazards.
How It Works
The limit switch continuously monitors temperature within the furnace plenum or heat exchanger area. If temperatures rise beyond the rated limit, the switch opens the control circuit, cutting power to the burner. Once temperatures return to a safe level within the operating differential, the circuit is restored and normal operation resumes.
Product Specifications
- Brand: Trane
- Part Number: SWT3985
- Model Designation: L150-30F
- Limit Temperature: 150°F
- Differential: 30°F
- Application: Furnace / Air Handler High Limit Protection
- Replacement Type: OEM Direct Replacement
Key Features
- Protects heat exchanger and furnace components from overheating
- Opens burner circuit at 150°F to prevent equipment damage
- 30°F differential allows system to reset after temperature normalizes
- Designed as a direct OEM replacement for Trane systems
- Helps maintain safe, reliable furnace operation
- Essential safety component for residential and light commercial HVAC systems
Compatibility
The SWT3985 is a genuine Trane replacement part intended for use in compatible Trane furnace and air handler models. Always verify compatibility with your specific unit’s model and serial number before installation. Consult your equipment’s service manual or contact a qualified HVAC technician for proper installation guidance.
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