Robust SPST Design: Provides reliable switching for 24V control boards

You must verify the furnace nomenclature and wiring schematic to ensure an automatic reset is appropriate for the safety circuit being serviced

this component provides the exact differential pressure sensing required for maintaining ASHRAE-compliant airflow cycles

reducing vibration and extending the service life of the drive assembly

and fitting type

McDonnell & Miller 150S-M Pump Controller Refrigerant Robust SPST Design: Provides reliableThe McDonnell & Miller 150S M is a commercial grade float type combination low water cut off and pump controller designed for steam boilers in high pressure industrial applications. Engineered for systems with a maximum pressure of 150 psi, this unit features a manual reset mechanism, ensuring that the burner circuit remains locked out following a low water event until a technician can verify the system's safety. The internal Monel bellows provides