leading to potential compressor damage

Corrosion-Resistant Hardware: Built to resist oxidation and scale buildup

Durable Construction: High-grade materials designed to withstand the harsh thermal cycling of industrial and residential plenums

ODF Connections: Precision 1/2" sweat copper fittings allow for clean

McDonnell & Miller 93-M Pump Controller R-22 leading to potential compressor damageThe McDonnell & Miller 93 M is a commercial grade combination low water cut off and pump controller designed specifically for steam boiler applications. Engineered for systems with a maximum steam pressure of 150 PSI, this unit features dual snap acting manual reset SPDT switches. These switches provide decisive electrical contact, preventing the rapid cycling or "chattering" often found in mercury free alternatives during turbulent water level