157S-RL HIGH PRESSURE LEVEL CONTROL - ALTERNATE TAPPINGS Hoffman McDonnell & Miller 551-S Data

McDonnell & Miller 551-S Data Sheet

DESCRIPTION & FEATURES: An all-purpose

• 1" NPT equalizing pipes and blow down valve required

• ‘U’ probe (extended barrel)

• Includes No

157S-RL HIGH PRESSURE LEVEL CONTROL - ALTERNATE TAPPINGS Hoffman McDonnell & Miller 551-S DataLow Water Cut Offs Mechanical For Steam Boilers Series 157S Low Water Cut Off Pump Controllers 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