or audible grinding during the actuation cycle

Key Benefits Direct OEM Replacement: Ensures 100% compatibility with BTH 400A and BTH 500A models

and GKT2438K

allowing the system to resume operation once pressure stabilizes within the 20" Hg to 100 PSIG setpoint range

use part number 5H0767220002

Trane SWT0977 Pressure switch 321702-401 or audible grinding during theThe 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