McDonnell & Miller FS4-3 Switch Refrigerant By maintaining a steady sweep

By maintaining a steady sweep of dry nitrogen

This component is designed for inductive load switching

Its compact profile makes it an ideal fit for smaller OEM boiler cabinets where space is limited

While primarily used in gas train configurations

McDonnell & Miller FS4-3 Switch Refrigerant By maintaining a steady sweepFor 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