McDonnell & Miller FS4-3J Flow Switch Els PW 17895 the board should be replaced

the board should be replaced

providing a clear indication that the control relay is energized

this assembly is compatible with various Raypak Digital Atmospheric and Low NOx heater models

leading to condensate backup

it is designed for free-standing radiators and cast iron convectors

McDonnell & Miller FS4-3J Flow Switch Els PW 17895 the board should be replacedThe McDonnell & Miller FS4 3J Flow Switch (Part Number 114610) is a heavy duty, general purpose liquid flow switch designed for HVAC and industrial hydronic systems. This model features a 1" BSPT connection, making it a critical component for international piping standards or specific domestic applications requiring British Standard Pipe Threads. Equipped with a Single Pole, Double Throw (SPDT) switch, the FS4 3J provides versatile signaling for