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A technician should check for continuity across the terminals when the switch is cool
Power must be cycled off and the underlying overcurrent issue resolved before the relay will reset and allow the system to resume operation
and ventilation circuits
Field Versatility: Direct compatibility with rigid or flexible round ductwork via crimped (male) and uncrimped (female) ends
McDonnell & Miller 157S-A Controller Els PW 17895 A technician should check forThe 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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