McDonnell & Miller 150S/157S Low Water Cut Off/Pump

For low pressure steam boilers with cold water feed Eliminates necessity to manually add water to the boiler Can be used with mechanical or electronic low water cut-off controls Quick-change replaceable cartridge valve and strainer Manual feed button Model 101-A features a 120 VAC solenoid Model 101-A-24 features a 24 VAC solenoid and a separate 50VA transformer Maximum water supply pressure 150 psi (10.5 kg/cm2) Maximum boiler pressure 25 psi (1.8 kg/cm2) Maximum inlet water temperature 120°F (49°C) Maximum power consumption – 40 VA at 24 VAC – 40 VA at 120 VAC If you need a different model other than those listed, please contact us at

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McDonnell & Miller 150S/157S Low Water Cut Off/Pump

Cut-off and alarm actuation
Optional features
Manual reset
2 Single pole, single throw switches
2 Single pole, double throw switches
Float block
BSPT threads
Maximum pressure 150 psi (10.5 kg/cm2)
For new electronic 150E Series see Model 150S-MD
Maximum differential operation – Prevents nuisance burner shutdowns in low pressure applications
Maximum operating pressure 50 psi (3.5 kg/cm2)



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