Trane SWT1999 Pressure Switch

The Trane SWT1999 is a critical SPDT differential pressure switch engineered for precision monitoring in residential and commercial HVAC applications. As an OEM Trane replacement part, this single pole double throw switch maintains system safety by detecting pressure variances across heat exchangers and inducer assemblies. Operating on a 0.43 PSI set point, the SWT1999 ensures the inducer motor establishes proper draft before ignition, effectively preventing hazardous combustion conditions. This rugged component is rated for pilot duty at 24V AC (125 VA) and up to 277V AC (360 VA), making it a versatile choice for a wide array of furnace pressure switch repairs. Its differential pressure design allows for precise control of air pressure variations, protecting equipment from overheating and ensuring peak operational efficiency in demanding environments ranging from -40 to 167 degrees Fahrenheit.

Key Benefits:

• Direct OEM Compatibility: Ensures seamless integration with Trane HVAC systems, maintaining original factory specifications.
• Dual-Action Control: The SPDT configuration provides flexible wiring options for both normally open and normally closed circuit requirements.
• High Precision Sensing: Factory-calibrated to 0.43 PSI for reliable detection of critical airflow and pressure drops.
• Industrial Grade Durability: Built to withstand extreme temperature fluctuations within the mechanical cabinet.
• Versatile Electrical Rating: Supports pilot duty applications across a broad voltage range, suitable for furnaces and air handlers.

Common Questions:

• What are the symptoms of a failing Trane SWT1999? Contractors typically see 3-flash or 2-flash error codes, indicating the switch failed to close or opened during a heat cycle, often due to a blocked flue or a ruptured internal diaphragm.
• Can this switch be used in both heating and cooling units? Yes, the differential pressure mechanism is designed to monitor airflow and pressure differentials in various HVAC configurations, including gas furnaces and heat pumps.
• How do I verify the SPDT operation? Technicians should use a manometer to apply the rated 0.43 PSI while checking for continuity change across the common, NO, and NC terminals using a multimeter.

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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.