{"product_id":"armstrong-106285mf-136a-s-57-3-pump-3-4-hp-cast-iron-circulator-3-phase","title":"Armstrong 106285MF-136A S-57-3 Pump | 3\/4 HP Cast Iron Circulator | 3-Phase","description":"\u003cp class=\"ds-markdown-paragraph\"\u003eFor robust commercial and industrial hydronic applications requiring reliable continuous operation, the Armstrong 106285MF-136A S-57-3 cast iron pump delivers exceptional performance and durability. This versatile 3\/4 HP circulator is engineered for medium-duty commercial HVAC systems, industrial processes, and larger residential applications where three-phase power availability and extended service life are paramount. Its heavy-duty construction and efficient design make it an ideal choice for system designers and facility managers seeking dependable circulation in demanding environments.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eThe pump features Armstrong’s proven wet-rotor technology, providing maintenance-free operation while eliminating coupling alignment issues and reducing energy consumption. The cast iron construction with bronze impeller ensures long-term durability in closed-loop heating and cooling systems, while the three-phase motor offers superior efficiency and torque characteristics compared to single-phase alternatives. With its compact inline configuration and standard flange connections, the S-57-3 installs easily in space-constrained mechanical rooms while delivering consistent, reliable fluid movement throughout your hydronic system.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eAs part of Armstrong’s respected S-57 series, this circulator continues a tradition of commercial-grade performance that mechanical professionals have trusted for decades. Whether serving in a school HVAC system, industrial process loop, or multi-building complex, the 106285MF-136A provides the robust circulation that keeps critical systems operating efficiently. Learn about its advantages in our article \u003cstrong\u003e[The Benefits of Three-Phase Motors in Commercial Hydronic Systems]\u003c\/strong\u003e.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e \u003cdiv class=\"ds-scroll-area _1210dd7\"\u003e \u003cdiv class=\"ds-scroll-area__gutters\"\u003e \u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e \u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003eSpecification\u003c\/th\u003e \u003cth\u003eDetails\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eArmstrong S-57-3 (106285MF-136A)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMotor Power\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e3\/4 HP (0.56 kW)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMotor Type\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e3-Phase\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eConnection Size\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e1-1\/2″ Flange x 1-1\/2″ Flange\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eImpeller Material\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eBronze\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eHousing Material\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eCast Iron\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMax Head\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e36 ft (11 m)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMax Flow\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e120 US gpm (454 L\/min)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSpeed Settings\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eSingle Speed\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMax Operating Pressure\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e125 psi (8.6 bar)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMax Fluid Temperature\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e230°F (110°C)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e208-230\/460V, 3-Phase\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e28 lbs (12.7 kg)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003chr\u003e \u003ch3\u003e\u003cstrong\u003eComparison Table: Armstrong S-57-3 vs. Alternative Circulators\u003c\/strong\u003e\u003c\/h3\u003e \u003cdiv class=\"ds-scroll-area _1210dd7\"\u003e \u003cdiv class=\"ds-scroll-area__gutters\"\u003e \u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e \u003cdiv class=\"ds-scroll-area__horizontal-bar\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003eFeature\u003c\/th\u003e \u003cth\u003eArmstrong S-57-3 (3-Phase)\u003c\/th\u003e \u003cth\u003eSingle-Phase Equivalent\u003c\/th\u003e \u003cth\u003eCompetitor 3-Phase Model\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMotor Efficiency\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eHigher (3-Phase Advantage)\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eStandard\u003c\/td\u003e \u003ctd\u003eHigher\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eStarting Torque\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eSmooth, High Torque\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eLower with Startup Surge\u003c\/td\u003e \u003ctd\u003eSmooth, High Torque\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMotor Simplicity\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eNo Start Capacitors Required\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRequires Start\/Run Capacitors\u003c\/td\u003e \u003ctd\u003eNo Start Capacitors\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePower Requirements\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRequires 3-Phase Service\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eStandard Single-Phase\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRequires 3-Phase Service\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eLong-Term Reliability\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eExcellent\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eGood\u003c\/td\u003e \u003ctd\u003eGood\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eOperating Cost\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eLower\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eHigher\u003c\/td\u003e \u003ctd\u003eLower\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003chr\u003e \u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions (FAQs)\u003c\/strong\u003e\u003c\/h3\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eQ1: What is the primary advantage of a 3-phase circulator like the S-57-3?\u003c\/strong\u003e\u003cbr\u003e Three-phase motors offer several key advantages: they’re more efficient, providing lower operating costs; they have higher starting torque for reliable operation; and they’re simpler in design with no start capacitors to fail, resulting in greater long-term reliability and reduced maintenance.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eQ2: Can this pump be used with a Variable Frequency Drive (VFD)?\u003c\/strong\u003e\u003cbr\u003e Yes, the 3-phase motor is ideal for VFD operation. Pairing with a VFD allows for precise speed control to match system demand, resulting in significant energy savings, soft starting to reduce electrical stress, and enhanced system control. For optimized performance, consider an \u003cstrong\u003e[Armstrong VFD Control Package]\u003c\/strong\u003e.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eQ3: What type of applications is this 3\/4 HP circulator best suited for?\u003c\/strong\u003e\u003cbr\u003e The S-57-3 excels in medium-duty commercial applications including:\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eSchool and office building HVAC systems\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eLarge residential complex heating systems\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eIndustrial process cooling circuits\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eSnow melt systems for commercial properties\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eSecondary loop pumping in larger hydronic systems\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eQ4: What maintenance does this circulator require?\u003c\/strong\u003e\u003cbr\u003e The wet-rotor design is essentially maintenance-free. The rotor is lubricated and cooled by the system fluid, requiring no periodic lubrication. Routine maintenance typically involves only ensuring clean system water and occasionally checking for unusual noises or vibrations.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eQ5: Is this pump suitable for both heating and cooling applications?\u003c\/strong\u003e\u003cbr\u003e Yes, the S-57-3 is designed for closed-loop hydronic systems operating with water or glycol solutions within its published temperature and pressure ratings. It performs effectively in both heating systems up to 230°F and chilled water cooling applications.\u003c\/p\u003e \u003chr\u003e \u003ch3\u003e\u003cstrong\u003ePros and Cons\u003c\/strong\u003e\u003c\/h3\u003e \u003cdiv class=\"ds-scroll-area _1210dd7\"\u003e \u003cdiv class=\"ds-scroll-area__gutters\"\u003e \u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e \u003cdiv class=\"ds-scroll-area__horizontal-bar\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e \u003c\/div\u003e \u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003ePros\u003c\/th\u003e \u003cth\u003eCons\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\n\u003cstrong\u003eHigher Efficiency\u003c\/strong\u003e with 3-phase motor operation\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eRequires 3-Phase Power\u003c\/strong\u003e – not for residential use\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\n\u003cstrong\u003eExcellent Reliability\u003c\/strong\u003e with simple motor design\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eHigher Initial Cost\u003c\/strong\u003e than single-phase models\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\n\u003cstrong\u003eMaintenance-Free Operation\u003c\/strong\u003e with wet-rotor design\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eSingle-Speed Operation\u003c\/strong\u003e limits flexibility\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\n\u003cstrong\u003eRobust Construction\u003c\/strong\u003e for long service life\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eHeavier Weight\u003c\/strong\u003e requires proper pipe support\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\n\u003cstrong\u003eIdeal for VFD Integration\u003c\/strong\u003e for energy optimization\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eNot for Potable Water\u003c\/strong\u003e applications\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCommercial-Grade Durability\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\n\u003cstrong\u003eLimited Availability\u003c\/strong\u003e in some markets\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/div\u003e \u003chr\u003e \u003ch3\u003e\u003cstrong\u003eConclusion \u0026amp; Ideal Use Cases\u003c\/strong\u003e\u003c\/h3\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eThe Armstrong 106285MF-136A S-57-3 cast iron circulator represents a professional-grade solution for commercial and industrial applications where three-phase power availability and operational efficiency are key considerations. Its robust construction and efficient motor design make it an excellent value for facilities seeking reliable performance with minimal maintenance requirements.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eThis circulator is ideally specified for:\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eCommercial Buildings:\u003c\/strong\u003e Office buildings, retail centers, and schools\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eMulti-Family Residential:\u003c\/strong\u003e Apartment complexes and condominiums\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eLight Industrial Facilities:\u003c\/strong\u003e Manufacturing plants and process systems\u003c\/p\u003e \u003c\/li\u003e \u003cli\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eInstitutional Applications:\u003c\/strong\u003e Government buildings and healthcare facilities\u003c\/p\u003e \u003c\/li\u003e \u003c\/ul\u003e \u003cp class=\"ds-markdown-paragraph\"\u003eFor applications with only single-phase power available, consider the \u003cstrong\u003e[Armstrong S-57 Single-Phase Series]\u003c\/strong\u003e. However, for facilities with three-phase service, the S-57-3 offers superior efficiency, reliability, and long-term value that justifies the initial investment.\u003c\/p\u003e \u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eContact our commercial HVAC specialists today for application engineering, performance curve analysis, and competitive pricing on this reliable workhorse circulator.\u003c\/strong\u003e\u003c\/p\u003e","brand":"TITANPARTHUB","offers":[{"title":"Default Title","offer_id":52160967016679,"sku":null,"price":2253.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0794\/7806\/3335\/files\/5e73bd1b-Pumps-ARMSTRONG-106285MF-136A-S-57-3-Cast-Iron-Pump.webp?v=1780566426","url":"https:\/\/titanparthub.com\/products\/armstrong-106285mf-136a-s-57-3-pump-3-4-hp-cast-iron-circulator-3-phase","provider":"TITANPARTHUB","version":"1.0","type":"link"}