Description

Series 157S

Features and Benefits

• 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 switches 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 1-1/4″ 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)

Model 157S-MD – Maximum differential operation

• Prevents nuisance burner shutdowns in low pressure applications
• Maximum operating pressure 50 psi (3.5 kg/cm2)

Electrical Ratings

                             Pump Circuit Rating (Amperes)

Alarm Circuit Rating (Amperes)

Dimensions

Click on the following to view dimensions:

MM 217N Series 150S and 157S Low Water Cut-Offs/Pump Controllers

Ordering Information:

Technical Documentation:

MM 217N Series 150S and 157S Low Water Cut-Offs/Pump Controllers

MM 219L Replacement Head Mechanism

MM 221REVI Models 157S RBP MD Low Water Cut-Offs/Pump Controllers

MM 412E Series 150 Head Gasket

MM 235G Replacement Snap Switch Assembly SWA 150S 150S MD 158S 159S

Catalog Pages:

Boiler Controls – MM-825H – Series 150S & 157S Pages 44-45

Boiler Controls Parts MM-701D Series 150, 150S, 157, 157S Pages-24-28