McDonnell & Miller 157S-A Controller Els PW 17895 Field Versatility: Direct compatibility with

Field Versatility: Direct compatibility with rigid or flexible round ductwork via crimped (male) and uncrimped (female) ends

or visible cracks upon inspection

and ventilation circuits

A technician should check for continuity across the terminals when the switch is cool

McDonnell & Miller 157S-A Controller Els PW 17895 Field Versatility: Direct compatibility withThe 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