Trane SWT0977 Pressure switch 318423-701 Broad Compatibility: Engineered for use

Broad Compatibility: Engineered for use with high-pressure refrigerants

110-203 is identical to SP9051B

For contractors managing large-scale Johnson Controls valve assemblies

provided the input impedance matches

Complete Installation Kit: Ships as a pump with hardware

Trane SWT0977 Pressure switch 318423-701 Broad Compatibility: Engineered for useThe 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