{"product_id":"grundfos-magna1-50-120-f-n-280-240v-stainless-steel-circulator-pump-99221361-model-c-4913","title":"Grundfos Magna1 50-120 F N 280 240V Stainless Steel Circulator Pump 99221361 Model C #4913","description":"\u003cdiv style=\"max-width: 900px; margin: 0 auto; padding: 20px; line-height: 1.6;\"\u003e\n\n\u003ch2\u003eGrundfos MAGNA1 50-120 F N 280 Model C – 240V Stainless Steel High-Efficiency Circulator Pump (99221361) #4913\u003c\/h2\u003e\n\n\u003cp\u003e\nThis listing is for a \u003cstrong\u003eGrundfos MAGNA1 50-120 F N 280 Model C\u003c\/strong\u003e high-efficiency single-head canned-rotor circulator pump with \u003cstrong\u003eDN50 flanged connections\u003c\/strong\u003e, a \u003cstrong\u003e280 mm port-to-port length\u003c\/strong\u003e and a \u003cstrong\u003estainless steel pump housing\u003c\/strong\u003e. The MAGNA1 range is designed for clean heating, cooling and building-services circulation systems where simple high-efficiency variable-speed control is required.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eN\u003c\/strong\u003e version has a stainless steel housing, making it the preferred MAGNA1 housing option where domestic hot-water compatibility or improved corrosion resistance is required, subject to the full system design, water quality and local installation requirements.\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e supplied in \u003cstrong\u003eas new surplus condition\u003c\/strong\u003e – the unit has not been installed or used but may show minor cosmetic markings from storage and handling. \u003cstrong\u003eGuarantee:\u003c\/strong\u003e supplied with a \u003cstrong\u003e2-year guarantee\u003c\/strong\u003e.\n\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump type:\u003c\/strong\u003e MAGNA1 Model C single-head canned-rotor circulator\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrundfos product number:\u003c\/strong\u003e 99221361\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnection:\u003c\/strong\u003e DN50 flanged\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePort-to-port length:\u003c\/strong\u003e 280 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePressure rating:\u003c\/strong\u003e PN6\/10 connection class\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical connection:\u003c\/strong\u003e terminal connection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrical supply:\u003c\/strong\u003e 1 × 230 V \/ 240 V class, 50\/60 Hz\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower input:\u003c\/strong\u003e P1 approx. 20.2–533 W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent:\u003c\/strong\u003e approx. 0.22–2.37 A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum head class:\u003c\/strong\u003e 12 m\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum flow:\u003c\/strong\u003e approx. 30 m³\/h \/ 8.3 L\/s\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum operating pressure:\u003c\/strong\u003e 10 bar\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLiquid temperature range:\u003c\/strong\u003e -10 °C to +110 °C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePump housing:\u003c\/strong\u003e stainless steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eControl:\u003c\/strong\u003e proportional pressure, constant pressure and constant curve \/ constant speed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory setting:\u003c\/strong\u003e PP2 proportional-pressure curve\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e glandless canned-rotor pump with no conventional mechanical shaft seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eNeed help confirming suitability?\u003c\/strong\u003e\u003cbr\u003e\nCall us on \u003cstrong\u003e01803 220416\u003c\/strong\u003e for technical advice.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eManufacturer product page\u003c\/h3\u003e\n\n\u003cp\u003e\nFull technical specifications, curves and documentation can be viewed on the official Grundfos product page:\u003cbr\u003e\n\u003ca href=\"https:\/\/product-selection.grundfos.com\/uk\/products\/magna\/magna1-n\/magna1-50-120-f-n-99221361?pumpsystemid=2948581390\u0026amp;tab=variant-curves\" rel=\"nofollow noopener\" target=\"_blank\"\u003e\nView Grundfos MAGNA1 50-120 F N (99221361) – Product curves and specifications\n\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTechnical documentation\u003c\/h3\u003e\n\n\u003cp\u003e\nMAGNA1 Model C technical data can be viewed here:\u003cbr\u003e\n\u003ca href=\"https:\/\/api.grundfos.com\/literature\/Grundfosliterature-5992758.pdf\" rel=\"nofollow noopener\" target=\"_blank\"\u003e\nView Grundfos MAGNA1 Model C technical data PDF\n\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTypical applications\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHeating systems and boiler circuits\u003c\/li\u003e\n  \u003cli\u003eMain circulation pumps\u003c\/li\u003e\n  \u003cli\u003eZone pumps and mixing loops\u003c\/li\u003e\n  \u003cli\u003eCommercial building-services circulation\u003c\/li\u003e\n  \u003cli\u003eAir-conditioning and chilled water systems\u003c\/li\u003e\n  \u003cli\u003eDomestic hot-water circulation systems, subject to water quality and installation requirements\u003c\/li\u003e\n  \u003cli\u003eGround-source heat pump and solar-heating systems\u003c\/li\u003e\n  \u003cli\u003eReplacement of matching DN50 flanged circulators\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eWhat does the model number mean?\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMAGNA1\u003c\/strong\u003e – Grundfos high-efficiency circulator range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e50\u003c\/strong\u003e – nominal diameter of inlet and outlet ports, DN50\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e120\u003c\/strong\u003e – maximum head class, 120 dm \/ approximately 12 m\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eF\u003c\/strong\u003e – flanged connection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eN\u003c\/strong\u003e – stainless steel pump housing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e280\u003c\/strong\u003e – port-to-port length in millimetres\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel C\u003c\/strong\u003e – MAGNA1 pump version shown on the nameplate\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat connection does this pump have?\u003c\/h4\u003e\n\n\u003cp\u003e\nThis pump has \u003cstrong\u003eDN50 flanged connections\u003c\/strong\u003e with a \u003cstrong\u003e280 mm port-to-port length\u003c\/strong\u003e. Please check the flange size, pressure rating and pipework gap against your existing pump before ordering.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhat does the N version mean?\u003c\/h4\u003e\n\n\u003cp\u003e\nThe \u003cstrong\u003eN\u003c\/strong\u003e in MAGNA1 50-120 F N indicates the \u003cstrong\u003estainless steel housing\u003c\/strong\u003e version of the pump. This is selected where stainless steel is required for corrosion resistance or media compatibility.\n\u003c\/p\u003e\n\n\u003cp\u003e\nFor domestic hot-water applications, Grundfos strongly recommends stainless steel pumps to help avoid corrosion. Suitability still depends on water quality, temperature, local regulations and the complete system design.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhat control modes are available on MAGNA1 Model C?\u003c\/h4\u003e\n\n\u003cp\u003e\nMAGNA1 Model C offers straightforward high-efficiency control without the more advanced monitoring features of MAGNA3. Available operating modes include:\n\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProportional pressure:\u003c\/strong\u003e PP1, PP2 and PP3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstant pressure:\u003c\/strong\u003e CP1, CP2 and CP3\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstant curve \/ constant speed:\u003c\/strong\u003e Speed I, II and III\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nThe factory setting is \u003cstrong\u003ePP2\u003c\/strong\u003e. The correct setting should be selected during commissioning to suit the system duty and valve arrangement.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhat does Model C add?\u003c\/h4\u003e\n\n\u003cp\u003e\nMAGNA1 Model C includes simple electronic control, LED operating indication, digital start\/stop input, fault relay output and Grundfos GO Remote communication when used with the appropriate Grundfos MI 301 infrared interface.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhy choose MAGNA1 instead of MAGNA3?\u003c\/h4\u003e\n\n\u003cp\u003e\nMAGNA1 is usually chosen where you want a reliable high-efficiency circulator with simple proportional-pressure, constant-pressure and constant-speed control. It is a good option for straightforward heating, cooling and circulation duties where advanced system monitoring is not required.\n\u003c\/p\u003e\n\n\u003cp\u003e\nMAGNA3 is the more advanced option, with additional control, monitoring and communication features such as built-in differential-pressure and temperature sensing, energy monitoring and more advanced commissioning options. If those extra functions are not needed, MAGNA1 can be a simpler and more cost-effective choice.\n\u003c\/p\u003e\n\n\u003ch4\u003eIs this suitable to replace other DN50 circulators?\u003c\/h4\u003e\n\n\u003cp\u003e\nThis model uses \u003cstrong\u003eDN50 flanged connections\u003c\/strong\u003e with a \u003cstrong\u003e280 mm port-to-port length\u003c\/strong\u003e. Where dimensions and duty are comparable, it can replace other DN50 in-line circulators from brands such as \u003cstrong\u003eWilo, Lowara and KSB\u003c\/strong\u003e, subject to hydraulic duty, flange standard, electrical supply and control compatibility.\n\u003c\/p\u003e\n\n\u003cp\u003e\nThe advantage of an electronically controlled circulator is that it can often be adjusted during commissioning to better match the required duty of the pump being replaced, rather than being locked to one fixed-speed curve.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhat liquids can this pump be used with?\u003c\/h4\u003e\n\n\u003cp\u003e\nMAGNA1 is suitable for thin, clean, non-aggressive and non-explosive liquids that do not contain solid particles, fibres or mineral oils. Typical uses include heating water, chilled water and clean circulation duties.\n\u003c\/p\u003e\n\n\u003cp\u003e\n\u003cstrong\u003eWater\/glycol mixtures may be used\u003c\/strong\u003e up to 50%, but glycol concentration and temperature affect viscosity, performance and pump selection. The system should be cleaned and flushed before glycol is added, and the glycol mixture should be maintained according to the supplier’s instructions.\n\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eLiquids containing solid particles or fibres\u003c\/li\u003e\n  \u003cli\u003eFlammable, combustible or explosive liquids\u003c\/li\u003e\n  \u003cli\u003eDiesel, petrol or mineral oils\u003c\/li\u003e\n  \u003cli\u003eAcids or aggressive chemicals\u003c\/li\u003e\n  \u003cli\u003eSea water or aggressive saline solutions\u003c\/li\u003e\n  \u003cli\u003eDirty water, wastewater or drainage applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eCan this be used on domestic hot-water systems?\u003c\/h4\u003e\n\n\u003cp\u003e\nYes, this is the \u003cstrong\u003estainless steel N version\u003c\/strong\u003e, which is the correct MAGNA1 housing choice where domestic hot-water compatibility is required. Suitability still depends on the full system design, water quality, operating temperature, local regulations and Grundfos installation guidance.\n\u003c\/p\u003e\n\n\u003cp\u003e\nGrundfos recommends stainless steel pumps for domestic hot-water systems to reduce corrosion risk. Grundfos also recommends keeping domestic hot-water hardness below approximately \u003cstrong\u003e14 °dH\u003c\/strong\u003e and keeping the liquid temperature below \u003cstrong\u003e65 °C\u003c\/strong\u003e to reduce the risk of lime precipitation.\n\u003c\/p\u003e\n\n\u003ch4\u003eWhat minimum inlet pressure is required?\u003c\/h4\u003e\n\n\u003cp\u003e\nThe required minimum inlet pressure depends on liquid temperature. For the MAGNA1 50-100 \/ 50-120 F family, the relevant guidance is:\n\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e75 °C:\u003c\/strong\u003e 0.10 bar\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e95 °C:\u003c\/strong\u003e 0.50 bar\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e110 °C:\u003c\/strong\u003e 1.00 bar\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\nThe inlet pressure and system pressure should always be checked against the installed duty, liquid temperature and manufacturer documentation before commissioning.\n\u003c\/p\u003e\n\n\u003ch4\u003eDoes this pump have a mechanical shaft seal?\u003c\/h4\u003e\n\n\u003cp\u003e\nNo. MAGNA1 is a \u003cstrong\u003ecanned-rotor circulator\u003c\/strong\u003e, meaning the pump and motor form an integrated wet-rotor unit without a conventional mechanical shaft seal.\n\u003c\/p\u003e\n\n\u003ch4\u003eDoes this pump need external motor protection?\u003c\/h4\u003e\n\n\u003cp\u003e\nNo external motor protection is normally required. The pump incorporates overload protection, but electrical installation must still be carried out correctly and in accordance with local regulations.\n\u003c\/p\u003e\n\n\u003ch4\u003eCan this pump be controlled or monitored externally?\u003c\/h4\u003e\n\n\u003cp\u003e\nYes. MAGNA1 Model C includes a digital input for external start\/stop and a relay output for fault signalling. It can also communicate with Grundfos GO Remote when used with the appropriate Grundfos MI 301 infrared interface.\n\u003c\/p\u003e\n\n\u003ch4\u003eIs this a new pump?\u003c\/h4\u003e\n\n\u003cp\u003e\nThis listing is for \u003cstrong\u003eas new surplus stock\u003c\/strong\u003e. The unit has not been installed or used but may show cosmetic marks from storage and handling.\n\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eAbout Our Stock\u003c\/h3\u003e\n\n\u003cp\u003e\nStock code: \u003cstrong\u003e#4913\u003c\/strong\u003e\u003cbr\u003e\nWe specialise in supplying \u003cstrong\u003enew and unused surplus pumps\u003c\/strong\u003e. This unit is inspected prior to dispatch and supplied with a \u003cstrong\u003e2-year guarantee\u003c\/strong\u003e.\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Grundfos","offers":[{"title":"Default Title","offer_id":57405834330489,"sku":null,"price":1995.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1218\/7894\/files\/195f07d3-b22c-4f8d-b30c-e7b4aee669cb.jpg?v=1781003857","url":"https:\/\/thepumpdealer.co.uk\/products\/grundfos-magna1-50-120-f-n-280-240v-stainless-steel-circulator-pump-99221361-model-c-4913","provider":"The Pump Dealer","version":"1.0","type":"link"}