McDonnell Miller Series 157MD

Overview

Model 157-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
Mercury 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 157-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)
For new electronic 150E Series see page 41