{"product_id":"1pcs-new-for-kk550cu-refrigerator-compressor-r290-550w-240v","title":"DONPER KK550CU R290 Refrigerator Compressor 550W 240V LBP","description":"\u003cdiv class=\"koeed-container\" style=\"line-height: 1.6; color: #333; width: 100%;\"\u003e\n\n  \u003c!-- CSS Styles specific to Koeed Visual Identity \u0026 Tool --\u003e\n  \u003cstyle\u003e\n    .koeed-container h2 { color: #0056b3; border-bottom: 2px solid #16c8c8; padding-bottom: 8px; margin-top: 30px; margin-bottom: 15px; font-size: 1.5em; }\n    .koeed-container h3 { color: #0056b3; margin-top: 25px; margin-bottom: 12px; font-size: 1.25em; }\n    .koeed-table { width: 100%; border-collapse: collapse; min-width: 500px; text-align: left; }\n    .koeed-table th { background-color: #0056b3; color: #ffffff; padding: 12px; border: 1px solid #eeeeee; font-weight: bold; }\n    .koeed-table td { padding: 12px; border: 1px solid #eeeeee; }\n    .koeed-table tr:nth-child(odd) { background-color: #f4fcfc; }\n    .koeed-table tr:nth-child(even) { background-color: #fafafa; }\n    \n    .koeed-tool-wrapper { background-color: #fafafa; border: 1px solid #eeeeee; padding: 20px; border-radius: 8px; margin-top: 20px; box-sizing: border-box; }\n    .koeed-input { border: 1px solid #cccccc; padding: 10px; width: 100%; box-sizing: border-box; border-radius: 4px; font-family: inherit; }\n    .koeed-input:focus { outline: none; border-color: #16c8c8; box-shadow: 0 0 5px rgba(22, 200, 200, 0.3); }\n    .koeed-btn { background-color: #16c8c8; color: #ffffff; border: none; padding: 12px 24px; cursor: pointer; font-weight: bold; border-radius: 4px; font-size: 1em; transition: background-color 0.2s; display: inline-block; }\n    .koeed-btn:hover { background-color: #13adad; }\n    .koeed-faq-item { margin-bottom: 15px; }\n    .koeed-faq-q { font-weight: bold; color: #0056b3; margin-bottom: 5px; display: block; }\n  \u003c\/style\u003e\n\n  \u003c!-- 1. SEO Introduction --\u003e\n  \u003ch2\u003eHigh-Efficiency DONPER KK550CU R290 LBP Compressor\u003c\/h2\u003e\n  \u003cp\u003eThe \u003cstrong\u003eDONPER KK550CU\u003c\/strong\u003e (also referenced as KK550CU1) is a high-performance hermetic refrigeration compressor engineered for demanding commercial and industrial low-temperature applications. Utilizing the eco-friendly \u003cstrong\u003eR290a (Propane) hydrocarbon refrigerant\u003c\/strong\u003e, this unit offers exceptional thermodynamic properties with virtually zero Global Warming Potential (GWP).\u003c\/p\u003e\n  \u003cp\u003eOperating at \u003cstrong\u003e240V\/50Hz\u003c\/strong\u003e, it delivers a robust cooling capacity of \u003cstrong\u003e550W @ -23.3°C\u003c\/strong\u003e. Its LBP (Low Back Pressure) configuration and reliable 11.4cc displacement make it the optimal direct-replacement power plant for commercial freezers, deep chillers, cold room displays, and heavy-duty ice cream making machines.\u003c\/p\u003e\n\n  \u003c!-- 2. Technical Specifications --\u003e\n  \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003cdiv style=\"overflow-x: auto; width: 100%;\"\u003e\n    \u003ctable class=\"koeed-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eSpecification Parameter\u003c\/th\u003e\n          \u003cth\u003eTechnical Value\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eManufacturer \/ Brand\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eDONPER (Huangshi Dongbei Electrical Appliance Co.)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eModel Number\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eKK550CU \/ KK550CU1\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eRefrigerant Type\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eR290a (Eco-Friendly Hydrocarbon)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eCooling Capacity\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e550W @ -23.3°C\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eHorsepower\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e3\/4 HP\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eDisplacement\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e11.4 cc\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eVoltage \/ Frequency\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e240V \/ 50Hz (Single Phase)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eApplication Configuration\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eLBP (Low Back Pressure)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eMotor Design\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eHermetic Reciprocating\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 3. Application \u0026 Reliability --\u003e\n  \u003ch3\u003eIndustrial Application \u0026amp; Reliability\u003c\/h3\u003e\n  \u003cp\u003eEngineered for continuous 24\/7 duty cycles, the DONPER KK550CU features a sealed motor housing that protects critical electrical components from moisture, dust, and particulate contamination commonly found in commercial kitchens and retail environments. Due to its LBP rating, it thrives in environments requiring deep freezing and rapid temperature recovery. It serves as a seamless plug-and-play upgrade for legacy R290 DONPER systems without the need for extensive structural modifications.\u003c\/p\u003e\n\n  \u003c!-- 4. Koeed B2B Tool: Interactive Traffic Asset --\u003e\n  \u003ch3\u003eKoeed B2B Tool: Hermetic Compressor C-S-R Winding Diagnostic\u003c\/h3\u003e\n  \u003cdiv class=\"koeed-tool-wrapper\"\u003e\n    \u003cp style=\"margin-top: 0;\"\u003eUnsure about the terminal pinouts on your compressor or suspect a burned motor? Use your multimeter to measure the resistance (in Ohms) across the three terminal pins. Arbitrarily label the pins A, B, and C, input your readings below, and our tool will mathematically determine the \u003cstrong\u003eCommon (C)\u003c\/strong\u003e, \u003cstrong\u003eStart (S)\u003c\/strong\u003e, and \u003cstrong\u003eRun (R)\u003c\/strong\u003e winding layout while checking for internal shorts.\u003c\/p\u003e\n    \n    \u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin-bottom: 20px;\"\u003e\n      \u003cdiv\u003e\n        \u003clabel style=\"display: block; font-weight: bold; color: #0056b3; margin-bottom: 5px;\"\u003eTerminal A to B (Ω):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-res-ab\" class=\"koeed-input\" placeholder=\"e.g. 15.2\" step=\"0.1\" min=\"0\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003clabel style=\"display: block; font-weight: bold; color: #0056b3; margin-bottom: 5px;\"\u003eTerminal B to C (Ω):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-res-bc\" class=\"koeed-input\" placeholder=\"e.g. 10.5\" step=\"0.1\" min=\"0\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv\u003e\n        \u003clabel style=\"display: block; font-weight: bold; color: #0056b3; margin-bottom: 5px;\"\u003eTerminal C to A (Ω):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-res-ca\" class=\"koeed-input\" placeholder=\"e.g. 4.7\" step=\"0.1\" min=\"0\"\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \n    \u003cbutton class=\"koeed-btn\" onclick=\"koeedDiagnoseCSR()\"\u003eDiagnose Windings\u003c\/button\u003e\n    \n    \u003cdiv id=\"koeed-csr-result\" style=\"margin-top: 20px;\"\u003e\u003c\/div\u003e\n    \n    \u003cnoscript\u003e\n      \u003cdiv style=\"margin-top: 15px; padding: 10px; background-color: #ffe6e6; color: #cc0000; border-left: 4px solid #cc0000;\"\u003e\n        \u003cstrong\u003eJavaScript Required:\u003c\/strong\u003e This winding diagnostic tool requires JavaScript to operate. The mathematical logic is simple: The highest resistance reading identifies the path between the Start and Run pins. The pin not involved in that highest reading is the Common pin. The resistance between Common and Start is always higher than Common and Run.\n      \u003c\/div\u003e\n    \u003c\/noscript\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 5. Troubleshooting FAQ --\u003e\n  \u003ch3\u003eTroubleshooting FAQ\u003c\/h3\u003e\n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cspan class=\"koeed-faq-q\"\u003eWhy is the KK550CU compressor short-cycling or drawing excessive amperage on startup?\u003c\/span\u003e\n    \u003cspan class=\"koeed-faq-a\"\u003eCheck the starting relay and overload protector. If the starting components are functional, use our winding diagnostic tool above. If the internal windings are degraded (e.g., Run and Start resistances sum significantly higher or lower than the direct Start-to-Run reading), the motor insulation may be failing, causing a high amp draw.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cspan class=\"koeed-faq-q\"\u003eIs it safe to retrofit an R134a or R404a system with this R290 compressor?\u003c\/span\u003e\n    \u003cspan class=\"koeed-faq-a\"\u003eNo. R290 (propane) is a highly flammable hydrocarbon (A3 safety class). This compressor must only be installed in refrigeration loops and electrical environments explicitly engineered and approved for R290. Using it in incompatible systems poses a severe fire and explosion hazard.\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cspan class=\"koeed-faq-q\"\u003eWhat should I check if the compressor is running but cooling capacity is poor?\u003c\/span\u003e\n    \u003cspan class=\"koeed-faq-a\"\u003eSince the KK550CU is an LBP unit delivering 550W at -23.3°C, any restriction in heat dissipation heavily throttles capacity. Ensure the external condenser coil is completely clean, condenser fans are operating at full speed, and verify the R290 charge level is exact, as hydrocarbon systems are extremely sensitive to under\/overcharging.\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Interactive Tool Logic --\u003e\n  \u003cscript\u003e\n    function koeedDiagnoseCSR() {\n      const valAB = parseFloat(document.getElementById('koeed-res-ab').value);\n      const valBC = parseFloat(document.getElementById('koeed-res-bc').value);\n      const valCA = parseFloat(document.getElementById('koeed-res-ca').value);\n      const resultDiv = document.getElementById('koeed-csr-result');\n\n      if (isNaN(valAB) || isNaN(valBC) || isNaN(valCA) || valAB \u003c 0 || valBC \u003c 0 || valCA \u003c 0) {\n        resultDiv.innerHTML = '\u003cdiv style=\"color: #cc0000; font-weight: bold;\"\u003eError: Please enter valid positive resistance numbers in all three fields.\u003c\/div\u003e';\n        return;\n      }\n\n      \/\/ Format for sorting\n      let nodes = [\n        { pair: 'A and B', val: valAB, opposite: 'C', p1: 'A', p2: 'B' },\n        { pair: 'B and C', val: valBC, opposite: 'A', p1: 'B', p2: 'C' },\n        { pair: 'C and A', val: valCA, opposite: 'B', p1: 'C', p2: 'A' }\n      ];\n\n      \/\/ Sort descending\n      nodes.sort((x, y) =\u003e y.val - x.val);\n\n      let highest = nodes[0];\n      let commonPin = highest.opposite;\n      let other1 = nodes[1];\n      let other2 = nodes[2];\n\n      \/\/ Figure out which pin is Start vs Run.\n      \/\/ Start winding has higher resistance to Common than Run winding.\n      let pinX = highest.p1;\n      let pinY = highest.p2;\n\n      let resToC_fromX = 0;\n      let resToC_fromY = 0;\n\n      if ((pinX === other1.p1 || pinX === other1.p2) \u0026\u0026 (commonPin === other1.p1 || commonPin === other1.p2)) {\n        resToC_fromX = other1.val;\n      } else {\n        resToC_fromX = other2.val;\n      }\n\n      if ((pinY === other1.p1 || pinY === other1.p2) \u0026\u0026 (commonPin === other1.p1 || commonPin === other1.p2)) {\n        resToC_fromY = other1.val;\n      } else {\n        resToC_fromY = other2.val;\n      }\n\n      let startPin, runPin, rCS, rCR;\n      if (resToC_fromX \u003e resToC_fromY) {\n        startPin = pinX;\n        runPin = pinY;\n        rCS = resToC_fromX;\n        rCR = resToC_fromY;\n      } else {\n        startPin = pinY;\n        runPin = pinX;\n        rCS = resToC_fromY;\n        rCR = resToC_fromX;\n      }\n\n      \/\/ Mathematical logic \u0026 Health state check\n      let sum = rCS + rCR;\n      let tolerance = 0.15; \/\/ 15% acceptable variance\n      let diff = Math.abs(sum - highest.val);\n      let isValidMath = diff \u003c= (highest.val * tolerance);\n\n      let healthHtml = '';\n      if (valAB === 0 || valBC === 0 || valCA === 0) {\n        healthHtml = '\u003cstrong style=\"color: #cc0000;\"\u003eCRITICAL FAULT (Short Circuit):\u003c\/strong\u003e One or more windings show 0 Ohms. The motor is internally shorted. Do not apply power.';\n      } else if (valAB \u003e 999 || valBC \u003e 999 || valCA \u003e 999) {\n        healthHtml = '\u003cstrong style=\"color: #cc0000;\"\u003eCRITICAL FAULT (Open Winding):\u003c\/strong\u003e Extremely high resistance detected. The motor winding is broken\/open internally.';\n      } else if (!isValidMath) {\n        healthHtml = `\u003cstrong style=\"color: #d28c00;\"\u003eWARNING (Resistance Imbalance):\u003c\/strong\u003e The sum of Start + Run windings (${sum.toFixed(1)} Ω) deviates significantly from the direct Start-to-Run reading (${highest.val.toFixed(1)} Ω). The motor insulation may be breaking down causing partial internal shorts.`;\n      } else {\n        healthHtml = '\u003cstrong style=\"color: #16c8c8;\"\u003eHEALTHY MOTOR:\u003c\/strong\u003e The winding resistances are mathematically balanced and within standard tolerance.';\n      }\n\n      let reportHtml = `\n        \u003cdiv style=\"background-color: #f4fcfc; padding: 20px; border-left: 5px solid #16c8c8; border-radius: 4px;\"\u003e\n          \u003ch4 style=\"margin-top: 0; color: #0056b3;\"\u003eWinding Analysis Report\u003c\/h4\u003e\n          \u003cul style=\"list-style-type: none; padding-left: 0; font-size: 1.1em; line-height: 1.8;\"\u003e\n            \u003cli\u003e🔌 \u003cstrong\u003eTerminal ${commonPin}:\u003c\/strong\u003e Common (C)\u003c\/li\u003e\n            \u003cli\u003e⚡ \u003cstrong\u003eTerminal ${startPin}:\u003c\/strong\u003e Start (S) \u003cem\u003e(${rCS.toFixed(1)} Ω)\u003c\/em\u003e\u003c\/li\u003e\n            \u003cli\u003e⚙️ \u003cstrong\u003eTerminal ${runPin}:\u003c\/strong\u003e Run (R) \u003cem\u003e(${rCR.toFixed(1)} Ω)\u003c\/em\u003e\u003c\/li\u003e\n          \u003c\/ul\u003e\n          \u003cdiv style=\"margin-top: 15px; padding-top: 15px; border-top: 1px solid #c2eaea;\"\u003e\n            ${healthHtml}\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n      `;\n      resultDiv.innerHTML = reportHtml;\n    }\n  \u003c\/script\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- JSON-LD Structured Data (Strictly NO Product Schema) --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Why is the KK550CU compressor short-cycling or drawing excessive amperage on startup?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Check the starting relay and overload protector. If the starting components are functional, use our winding diagnostic tool above. If the internal windings are degraded, the motor insulation may be failing, causing a high amp draw.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Is it safe to retrofit an R134a or R404a system with this R290 compressor?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"No. R290 (propane) is a highly flammable hydrocarbon (A3 safety class). This compressor must only be installed in refrigeration loops and electrical environments explicitly engineered and approved for R290.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What should I check if the compressor is running but cooling capacity is poor?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Since the KK550CU is an LBP unit delivering 550W at -23.3°C, any restriction in heat dissipation heavily throttles capacity. Ensure the external condenser coil is completely clean, condenser fans are operating, and verify the R290 charge level is exact.\"\n          }\n        }\n      ]\n    },\n    {\n      \"@type\": \"WebApplication\",\n      \"name\": \"Koeed Hermetic Compressor C-S-R Winding Diagnostic Tool\",\n      \"url\": \"https:\/\/koeed.com\/\",\n      \"description\": \"An interactive utility tool for HVAC\/R engineers to instantly identify Common, Start, and Run terminals on single-phase hermetic compressors, and diagnose motor winding health based on resistance readings.\",\n      \"applicationCategory\": \"Utility\",\n      \"operatingSystem\": \"All\"\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":43992084709561,"sku":"305313972757","price":498.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/20240913120327.jpg?v=1726200274","url":"https:\/\/koeed.com\/pt\/products\/1pcs-new-for-kk550cu-refrigerator-compressor-r290-550w-240v","provider":"KOEED","version":"1.0","type":"link"}