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or visible cracks upon inspection
reducing wear on internal mechanical components
and ventilation circuits
if the unit was in a lockout state due to low water
McDonnell & Miller 157S-A Controller Els PW 17895 or visible cracks upon inspectionThe McDonnell & Miller 157S A (Part Number 173702) is a heavy duty combination low water cut off and pump controller designed specifically for commercial and industrial steam boiler applications. Featuring a snap acting SPDT switch, this unit ensures precise control over water levels and reliable burner cutout during low water conditions. The 157S A model includes alternate tappings, providing versatile installation options for equalizing pipes and
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