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5-ton systems
calibrated gate that reacts to minute changes in pressure
Contractor Reliability: Simple 3-wire terminal interface reduces field installation time and simplifies Series 14 troubleshooting
ensuring the airtight seal necessary to maintain precise inches of water column (WC) for the draft inducer
McDonnell & Miller 157S-R Controller R-22 5-ton systemsThe 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