McDonnell & Miller FS254 General Purpose Liquid Flow SwitchThe FS254 General Purpose Liquid Flow Switch from McDonnell & Miller delivers dependable flow monitoring for commercial heating, cooling, and process systems. This paddle type universal flow switch uses a 1 inch nominal size with threaded end connections to integrate easily into standard piping. Designed for rugged environments, the FS254 houses an SPDT snap switch inside a NEMA 4 enclosure, with an adjustable sensitivity screw and an EPDM O ring for

It’s crafted to withstand typical residential use while preserving the safety features that keep family spaces secure

Ideal for replacing worn or inefficient igniters

Pressure: 3 PSI

matching the sensing elements and electrical connections used in Bacharach instruments

while the included adapter and temperature gauge simplify installation and monitoring

and a current rating of 3 A at 132 VAC

it features a pressure setting range of 3 to 60 PSI with a factory setting of 15 PSI and a gauge scale from 0 to 60 PSI for easy monitoring

Its rugged gray finish matches many control panels

temperature rating 150°F

With a practical 8 inch rough-in dimension

open circuit 25–35 mV

7 for reliable flow control