McDonnell & Miller 157S-A Controller Els PW 17895 this fixed-range pressure switch is

this fixed-range pressure switch is frequently used as a safety limit switch to ensure proper drafting or airflow before ignition sequences are initiated

This specific model is a commercial cast iron type intended for non-corrosive refrigerants

slide it to the desired maximum temperature on the dial scale

Simple Integration: Features 7/16" UNS threads and self-aligning ferrules for 1/4" OD rigid tubing connections

000 BTU/hr capacity for multiple appliances

McDonnell & Miller 157S-A Controller Els PW 17895 this fixed-range pressure switch isThe 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