Boiler Controls         Series 150 & 150S Low Water Cut-Ofts for Steam Boilers The Series 150 Float-Type Low Water Cut-Off Control is designed for low- and high-pressure boiler applications up to 150 psi (10.5 kg/cm2).         Series 93 & 94 Low Water Cut-Ofts for Steam Boilers The Series 93 is designed to maintain consistent water level, regardless of pressure, for commercial and industrial low- or high-pressure steam boilers of any capacity. Maximum pressure 150 psi (10.5 kg/cm2). No.5 switch included.         Series 67 Low Water Cut-Ofts for Steam Boilers Designed for gas and oil-fired steam boilers (24v or 120v) of any size up to 20 psi (1.4 kg/cm2), the Series 67 Float-Type Low Water Cut-Off Control provides proven performance and easy blow down.      • For residential and commercial applications      • For boilers of any steaming capacity      • Quick hook-up fittings      • Adjustable BX outlet for easy installation         Series 51 Water Feeder The Series 51 Water Feeder is designed for low-pressure steam and water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed. Can be upgraded with a NO.2 switch to add low water cut-off function. Maximum water supply pressure 150 psi (10.5 kg/cm2).         Series 47 Mechanical Water Feeders Designed for steam and hot water boilers with cold water feed, the Series 47 can be used with mechanical or electronic low water cut-off. Can be field upgraded with a No.2 switch to add water cut-off function. Maximum water supply 150 psi (10.5 kg/cm2).         Series 42 Low Water Cut-Ofts for Steam Boilers The Series 42 is designed for residential, commercial and industrial low- and mediumpressure steam boilers with a separate water column. For boilers of any steam capacity. Maximum pressure 50 psi (3.5kg/cm2).       Flow Switches         Series FS1/FS6 The Series FS1 and FS6 are designed for general and heavy-duty applications where high sensitivity is required. The FS1 is used for moderate or low flow rate systems such as air conditioning, heating and hydronic systems, water, fuel oil, some viscous liquids and oils in process work. The FS6 is used for such things as treatment systems, cooling systems for electronic circuits, compressors, booster pumps and bearings and other applications that need instant switching.         Series FS4-3 Universal design serves the widest variety of applications. The Series FS4-3 is designed to start or stop electronically operated equipment such as signal lights, alarms, motors, automatic burners, metering devices and others. Serves as replacement for Johnson Controls' flow switch Model F61 KB-11. Minimum temperature (fluid or ambient) 32°F (O°C). Maximum temperature 300°F (149°C).         Series FS5 Designed for general applications requiring low flow-rate sensitivity. Its in-line configuration eliminates need for pipe tee. Single pole, double-throw snap switch. Sensitivity adjusting screw makes flow adjustment easy. Maximum operating pressure 150 psi (10.5 kg/cm2).         Series FS7-4 The Series FS7-4 features a universal design that serves the widest variety of large pipe applications, including heating and hydronic systems, air conditioning, refrigeration and process work.         Series FS8-W The Series FS8-W is designed for general purpose applications with environmental exposure, or those requiring a water-tight, dust-tight or a NEMA 4X-rated flow switch. Optional features include BSPT threads and gold-plated contacts.         Series AF The Series AF provides a positive and economical way to detect change or loss of air flow velocity caused by closed damper or fan inlet, a loose fan wheel, a slipped or broken fan belt, a dirty or clogged filler or an overload on a fan motor switch. The Series AF1 flow switches are designed for medium and higher velocity systems. Models AF2 and AF3 are for systems with lower air-flow velocities.