McDonnell & Miller 157S-R Controller THPU32HP7Y Its robust construction is designed

Its robust construction is designed to withstand the repetitive cycling inherent in HVAC building automation systems

With a compact open board with standoffs configuration

This heavy-duty wire guard is critical for maintaining HVAC safety compliance by providing a protective barrier around the axial fan assembly without impeding airflow or increasing static pressure

Its robust internal circuitry is engineered to handle the electrical demands of hydronic heating systems

and debris to safeguard the compressor

McDonnell & Miller 157S-R Controller THPU32HP7Y Its robust construction is designedThe McDonnell & Miller 157S R (Part Number 176220) is a heavy duty, float operated combination low water cut off and pump controller designed specifically for steam boilers with an integral water column. This model serves as the upgraded direct replacement for the McDonnell & Miller 157 R, transitioning from older mercury switch technology to reliable, bimetal snap acting switches for enhanced safety and modern compliance. Built with a corrosion