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the VS series equivalent should be utilized
the board should be replaced
it is designed for free-standing radiators and cast iron convectors
always verify the orifice size if your job site exceeds this elevation to ensure proper de-rating
providing a clear indication that the control relay is energized
McDonnell & Miller FS4-3J Flow Switch Els PW 17895 the VS series equivalent shouldThe 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
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