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Boiler Level Control

Xylem — a premium applications solutions company dedicated exclusively to solving our customers’ most challenging water problems — was formed from ITT Corporation’s spinoff of several strategic business segments in October 2011, namely the Water & Wastewater, Residential & Commercial Water, Analytics and Flow Control businesses.

As a stand-alone company, we are a world leader in water technology, providing equipment and services for water and wastewater applications with a broad portfolio of products and services that address the full cycle of water — from collection, distribution and use to its return to the environment. Through our signature citizenship program, Xylem Watermark, we bring clean water, sanitation and hygiene education to schools and communities in emerging markets, and respond with water solutions when disaster strikes around the globe.


The Series 1575 provides continuous protection against a low water condition and satisfies pump control needs for commercial and industrial steam boilers. The 1575 compensates for rapidly changing water levels. It has adjustable burner and pump settings and powerful 1 Hp relays.

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Features and Benefits • For residential and commercial applications • Electronic operation • Easy to install and wire • Red low water indicating LED • Green power indicating LED • Now with test button • Automatic reset • No blow down required • 20,000 ohms probe sensitivity • Maximum ambient temperature 120ฐF (49ฐC) • Maximum water temperature 250ฐF (121ฐC) • Maximum water pressure 160 psi (11.2 kg/cm2)

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• Brass threads provide a metal-to-metal seal that ensures a leak-free installation. • Integrated wrench flats enable secure installation without damage to the housing. • McDonnell & Miller’s patented self-cleaning probe minimizes scale build-up and extends the recommended cleaning interval to 5 years. • “Plug & Play” wiring harnesses are available for most residential gas-burning boilers. • Designed, built and tested at Xylem’s production facility in Morton Grove, IL USA.

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The RBT-3000 is a combination Low-Water Safety Cut-Off and Fuel-Saving controller for residential heating systems. The Low Water Cut-Off is specifically designed to provide burner cut-off if there is an unsafe water loss, which can result from a broken or leaking radiator or pipe, or a cracked section in the boiler. The Energy saving feature reduces: fuel consumption, wear on boiler parts and burner emissions, by actively managing the burner cycling, in conjunction with the boiler operating-control, to properly match boiler-output to the required load. This controller indicates actual savings on a burner cycle by cycle basis and also indicates the averages of these cycles. All programmable parameters are stored in non-volatile memory.

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• NEMA 1 Enclosure • Maximum Temperature 406ฐF (208ฐC) • Maximum Pressure 250 psig (17.6 kg/cm)

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• Maximum Water Temperature: 250ฐF (121ฐC) • Maximum Water Pressure: 160 psi (11.2kg/cm2) • Maximum Steam Pressure: 15 psig (1.0 kg/cm2) • Can be installed in horizontal orientation

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• For boiler receiver tanks • Direct mounting eliminates need for equalizing connections • Proportional feed action • Mounting Flange – six 7⁄16″ (11.1mm) bolt holes on a 53⁄4″ (146mm) bolt circle • Soft seat provides positive seal • Maximum water supply pressure 150 psi (10.5 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum vessel pressure 35 psi (2.5 kg/cm2)

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• For boiler receiver tanks • Float operated • Proportional feed action • Soft seat provides positive seal • Seal between float chamber and valve chamber is not a positive seal • Maximum water supply pressure 100 psi (7 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum vessel pressure 35 psi (2.5 kg/cm2)

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• For commercial and industrial liquid level open tank applications • Materials of construction • Brass • Monel valve seat, EPDM disc • Maximum pressure 35 psi (2.5 kg/cm2) • Maximum supply pressure 100 psi (7 kg/cm2) • Minimum liquid temperature 40ฐF (4.4ฐC) • Maximum liquid temperature 212ฐF (100ฐC)

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• For steam and hot water boilers with cold water feed • Continuous maintenance of minimum safe water level, independent of electrical service • Proportional feed action • Quick hook-up fittings provided • Quick-change replaceable cartridge valve and strainer • Optional features • No. 2 switch • Manual reset • Model 47 can be field upgraded with a No. 2 switch to add low water cut-off function • Maximum water supply pressure 150 psi (10.5 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum boiler pressure 25 psi (1.8 kg/cm2)

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For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column. For boilers of any steaming capacity Monel bellows provides corrosion resistance. Single pole, single throw snap action switches. Enclosed junction box protects switches. Optional features Maximum pressure 50 psi (3.5 kg/cm2)

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• For steam and hot water boilers with cold water feed • Continuous maintenance of minimum safe water level, • independent of electrical service • Proportional feed action • Quick-change replaceable cartridge valve and strainer • Quiet, durable operation • Isolated feed valve minimizes lime and scale build-up • Optional features – No. 2 switch – Manual reset • Model 247 can be field upgraded with a No. 2 switch to • add low water cut-off function • Maximum water supply pressure 150 psi (10.5 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum vessel pressure 30 psi (2.1 kg/cm2)

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• For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed • Quick-change replaceable cartridge valve and strainer • Proportional feed action • Model 51 can be field upgraded with a No. 2 switch to • add low water cut-off function • Maximum water supply pressure 150 psi (10.5 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum vessel pressure 35 psi (2.5 kg/cm2) Optional features – No. 2 switch – Manual reset – Float block

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• For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) with hot or cold water feed • Proportional feed action • Model 53 can be field upgraded with a No. 2 switch to • add low water cut-off function • Maximum water supply pressure 150 psi (10.5 kg/cm2) • Maximum inlet water temperature 120ฐF (49ฐC) • Maximum vessel pressure 75 psi (5.3 kg/cm2) Optional features – No. 2 switch – Manual reset – Float block

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