McDonnell Miller Series 157S-MD
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McDonnell Miller Series 157S-MD Low Water Cut-off/Pump Controller is used on residential, commercial and industrial low or high pressure boiler applications. Maximum operating pressure 50 psi (3.5 kg/cm2).
McDonnell Miller Model 157S-MD
Maximum differential operation
Prevents nuisance burner shutdowns in low pressure
applications
Maximum operating pressure 50 psi (3.5 kg/cm2)
For residential, commercial and industrial low or high
pressure boiler applications
For boilers of any steaming capacity
Monel bellows provides corrosion resistance
Float chamber with integral water column provided
`Snap action for high temperature service
1 Single pole, single throw switch for pump control
1 Single pole, double throw switch for low water
cut-off and alarm actuation
Optional features
Manual reset
Integral conductance probes for additional levels and
greater operating differential-Model 157S-RBP-MD
1” or 11⁄4” NPT equalizing tappings
1⁄2” or 3⁄4” NPT tappings for gauge glass/tri-cock
installations
BSPT threads
Maximum pressure 150 psi (10.5 kg/cm2)