Trane SWT0977 Pressure switch 318423-701 Enhanced Safety Interlock: Actively monitors

Enhanced Safety Interlock: Actively monitors pressure differentials to prevent combustion if the inducer fails or the flue becomes obstructed

provided the input impedance matches

For contractors managing large-scale Johnson Controls valve assemblies

This motor features a standard 1/2-inch diameter shaft with a length of approximately 3

Complete Installation Kit: Ships as a pump with hardware

Trane SWT0977 Pressure switch 318423-701 Enhanced Safety Interlock: Actively monitorsThe Trane SWT0977 Pressure Switch is an essential OEM safety component designed for precise monitoring of combustion blower performance in negative pressure venting systems. This SPNO (Single Pole Normally Open) device, often cross referenced as Honeywell FS4171 1057 or C145526P01, is engineered to ensure the inducer motor is moving sufficient air before allowing the ignition sequence to proceed. Featuring a 1 4 compression connection and a calibrated