Trane SWT3019 Flow Switch

The Trane SWT3019 Flow Switch is a critical safety component designed for precise reverse flow detection in light commercial and residential units. Built for high-reliability air and liquid monitoring, this genuine OEM part ensures that system operations are halted when thermal or pressure thresholds are exceeded, preventing catastrophic heat exchanger failure. For technicians managing Trane furnace troubleshooting, this switch serves as a primary limit against backflow conditions on the return air side of the assembly. Featuring standard 1/4" quick-connect terminals, it integrates seamlessly into existing wiring harnesses, supporting both 120V and 240V circuits.

Operating as a temperature-actuated safety, the SWT3019 is calibrated to open at 95°F and close at 85°F. This specific differential is essential for preventing short-cycling while maintaining rigorous protection levels for the burner and vent motor. Whether you are performing a flow switch replacement in an ADC, ADX, or TDC series furnace, this genuine Trane part maintains the factory-specified 95Op 85Cl setpoints required for safety certification. Its compact, durable housing is engineered for the high-vibration environments typical of HVAC blower compartments.

• Precise Safety Calibration: Fixed 95°F open and 85°F close setpoints ensure accurate response to reverse flow temperatures.
• OEM Compatibility: Direct Trane SWT3019 replacement for multiple furnace models, including ADX1B080 and TDX080 series.
• Dual Voltage Support: Rated for reliable operation across 120V/240V HVAC control circuits.
• Simplified Installation: Standard 1/4 inch quick terminals allow for rapid field replacement during service calls.
• System Protection: Actively monitors for backflow to protect the heat exchanger and combustion components from thermal stress.

Where is the SWT3019 typically installed?
This switch is mounted on the HE side (heat exchanger side) of the return air stream to detect reverse flow conditions that could indicate a blower failure or venting issue.

Can I use this switch in both heating and cooling applications?
Yes, while commonly found in Trane gas furnaces, it is a versatile safety switch used wherever a 95°F thermal break is required for reverse flow logic.

What are the signs of a failing flow switch?
Technicians typically encounter nuisance trips or a system that fails to initiate the ignition sequence because the switch remains in the 'open' state, often due to mechanical wear or debris at the sensor interface.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.