use part number 5H0767220002

and GKT2438K

or audible grinding during the actuation cycle

By integrating an internal microprocessor

Trane SWT0977 Pressure switch 321702-401 use part number 5H0767220002The 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