Trane SWT3555 Switch

The Trane SWT3555 Switch is a critical low pressure cutout designed for precision monitoring in commercial and residential HVAC systems. Engineered for high-reliability compressor protection, this snap-action differential pressure switch features a fixed setpoint that triggers an open circuit at 24 PSI and restores the connection at 45 PSI. By acting as a fail-safe, the Trane SWT3555 prevents the system from operating under a loss-of-charge condition or during a frozen evaporator event, which can lead to catastrophic compressor failure. This OEM Trane replacement part ensures seamless compatibility with air handlers and chillers, maintaining the thermodynamic balance required for optimal cooling efficiency. Built to withstand standard vibration and terminal cycles, it provides licensed contractors with a dependable solution for HVAC system diagnostics and repair.

• Enhanced Hardware Protection: Automatically shuts down the cycle when refrigerant levels drop below 24 PSI to prevent mechanical seizure.
• Factory-Calibrated Precision: Features a 21 PSI differential (Open @ 24 / Close @ 45) to minimize short-cycling and ensure stable system operation.
• OEM Compatibility: Specifically designed for Trane HVAC systems, ensuring exact fitment and electrical alignment without the need for field modifications.
• Rugged Electrical Rating: Capable of handling standard industrial voltages (up to 240 VAC), making it suitable for a wide range of air-cooled equipment.

What causes the Trane SWT3555 to trip?
This switch typically opens due to low refrigerant levels, a clogged filter-drier, or restricted airflow causing the evaporator coil to freeze.

Is the SWT3555 an auto-reset or manual-reset switch?
This specific model functions as an automatic reset switch, closing the circuit back at 45 PSI once the system pressure stabilizes.

How do I verify if the switch is faulty?
Technicians should use a manifold gauge set to check actual line pressure against the 24/45 setpoints and verify continuity across the terminals with an ohmmeter.

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.