McDonnell & Miller FS4-3 Switch 30067439-890 Common Questions: How do I

Common Questions: How do I know if the THT2435 is tripped

Combustion Safety: Critical for preventing fuel leaks and ensuring proper manifold pressure regulation for safe indoor operation

this fuse "blows" to prevent damage to the wiring harness and surrounding cabinet components

The switch features a single-pole

Commercial Grade: Built to handle the high-cycle demands of commercial-line heaters and hydronic boilers

McDonnell & Miller FS4-3 Switch 30067439-890 Common Questions: How do IFor contractors requiring reliable system protection, the McDonnell & Miller FS4 3 (Part Number 114400) is a heavy duty general purpose liquid flow switch designed to monitor flow in heating, cooling, and water process lines. This 1" NPT unit features a single pole, double throw (SPDT) configuration, allowing you to easily integrate signal lights, alarms, motors, or burners into the control circuit. Engineered to operate at a max pressure of 160 PSI