{"product_id":"shangfang-sf-574-sf574-temperature-controller-250vac","title":"SHANGFANG SF-574 Temperature Controller 250VAC with Precision Temperature Regulation","description":"\u003c!-- SEO Introduction --\u003e\n\u003csection class=\"koeed-container\"\u003e\n  \u003ch2 style=\"color: #0056b3;\"\u003eSHANGFANG SF-574 Precision Digital Temperature Controller\u003c\/h2\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eSHANGFANG SF-574\u003c\/strong\u003e is a professional-grade digital thermostat designed for high-accuracy thermal \n    regulation in industrial and commercial cooling systems. Rated for \u003cstrong\u003e250V AC\u003c\/strong\u003e, it features multi-relay \n    outputs to manage compressors, defrost cycles, and fan operations simultaneously. With its intuitive \n    interface and robust sensor feedback, the SF-574 is an essential component for cold storage, \n    refrigerated showcases, and laboratory incubators requiring strict \u003cstrong\u003ePrecision Temperature Regulation\u003c\/strong\u003e.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKeywords:\u003c\/strong\u003e SHANGFANG SF-574 Controller, 250VAC Digital Thermostat, Refrigeration Temperature Control, Defrost Cycle Timer, Industrial NTC Sensor.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003chr style=\"border: 0; border-top: 1px solid #eeeeee; margin: 20px 0;\"\u003e\n\n\u003c!-- Technical Specifications --\u003e\n\u003csection class=\"koeed-specs\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003cdiv style=\"overflow-x: auto;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eDetailed Specification\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003ePower Supply\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e220V - 250V AC, 50\/60Hz\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eTemp. Range\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e-45°C to +99°C (-49°F to +210°F)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eAccuracy\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e±1°C (±2°F)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eRelay Contact\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eCompressor: 10A\/250VAC | Defrost: 10A\/250VAC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eSensor Type\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eNTC (Negative Temperature Coefficient)\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- Application --\u003e\n\u003csection class=\"koeed-application\" style=\"margin-top: 25px;\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eIndustrial Application \u0026amp; Reliability\u003c\/h3\u003e\n  \u003cp\u003e\n    The SF-574 is engineered for \u003cstrong\u003eenergy-efficient refrigeration control\u003c\/strong\u003e. Its dual-sensor capability allows \n    for independent monitoring of ambient temperature and evaporator coil temperature, optimizing defrosting \n    termination to save electricity. The anti-interference design makes it suitable for integration into \n    \u003cstrong\u003esupermarket blast freezers, medical storage units, and climate-controlled grow rooms\u003c\/strong\u003e.\n  \u003c\/p\u003e\n  \n\u003c\/section\u003e\n\n\u003c!-- Koeed B2B Tool: Logic Simulator --\u003e\n\u003csection id=\"koeed-tool-section\" style=\"margin: 30px 0; padding: 25px; border: 2px solid #16c8c8; border-radius: 8px; background-color: #fff;\"\u003e\n  \u003ch3 style=\"text-align: center; color: #16c8c8; margin-top: 0;\"\u003eKoeed Interactive: SF-574 Cycle Simulator\u003c\/h3\u003e\n  \u003cp style=\"font-size: 13px; text-align: center; color: #666;\"\u003eEstimate compressor engagement points based on your target and hysteresis settings.\u003c\/p\u003e\n  \n  \u003cdiv style=\"display: flex; flex-direction: column; gap: 15px; max-width: 450px; margin: 0 auto;\"\u003e\n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-target\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eTarget Temperature (°C):\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-target\" value=\"-18\" style=\"width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px;\" aria-label=\"Target Temperature\"\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-diff\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eHysteresis \/ Differential (°C):\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-diff\" value=\"2\" min=\"1\" max=\"15\" style=\"width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px;\" aria-label=\"Temperature Differential\"\u003e\n    \u003c\/div\u003e\n\n    \u003cbutton onclick=\"koeedCalcLogic()\" style=\"background-color: #16c8c8; color: white; border: none; padding: 14px; cursor: pointer; border-radius: 4px; font-weight: bold; font-size: 16px;\"\u003eAnalyze Control Logic\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv id=\"koeed-tool-result\" style=\"margin-top: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #16c8c8; display: none;\"\u003e\u003c\/div\u003e\n\n  \u003cnoscript\u003e\n    \u003cp\u003eManual Tip: The SF-574 engages the compressor when the temperature reaches (Target + Hysteresis) and disengages when it hits the Target. Ensure your differential is not too small to prevent compressor short-cycling.\u003c\/p\u003e\n  \u003c\/noscript\u003e\n\u003c\/section\u003e\n\n\u003c!-- Troubleshooting FAQ --\u003e\n\u003csection class=\"koeed-faq\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTroubleshooting FAQ\u003c\/h3\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ1: The display shows \"E1\" or \"EE\" and the alarm sounds.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e This indicates a \u003cstrong\u003eSensor Fault\u003c\/strong\u003e. Check if the NTC probe is securely connected to terminals. If the probe is damaged, replace it with an identical 10K NTC thermistor to restore precision tracking.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ2: The compressor frequently starts and stops within seconds (Short-cycling).\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Verify the \u003cstrong\u003eHysteresis (Differential)\u003c\/strong\u003e setting. A value below 2°C can cause excessive switching. Increase the differential or set a higher \"Compressor Start Delay\" (usually parameter F2 or similar) to protect the motor.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ3: Defrost is running too long and heating up the cabinet.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Adjust the \u003cstrong\u003eDefrost Termination Temperature\u003c\/strong\u003e. The SF-574 should stop the heating element once the evaporator reaches a safe limit (typically +5°C to +8°C), rather than relying purely on a timer.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- JavaScript Logic --\u003e\n\u003cscript\u003e\nfunction koeedCalcLogic() {\n  const target = parseFloat(document.getElementById('koeed-target').value);\n  const diff = parseFloat(document.getElementById('koeed-diff').value);\n  const resultDiv = document.getElementById('koeed-tool-result');\n  \n  const startTemp = target + diff;\n  \n  resultDiv.style.display = 'block';\n  resultDiv.innerHTML = `\n    \u003cdiv style=\"font-weight: bold; color: #0056b3; margin-bottom: 8px;\"\u003eOperational Logic Report:\u003c\/div\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; line-height: 1.6;\"\u003e\n      \u003cli\u003eCompressor will \u003cstrong\u003eTURN ON\u003c\/strong\u003e at: \u003cspan style=\"color: #d9534f;\"\u003e${startTemp}°C\u003c\/span\u003e\u003c\/li\u003e\n      \u003cli\u003eCompressor will \u003cstrong\u003eTURN OFF\u003c\/strong\u003e at: \u003cspan style=\"color: #16c8c8;\"\u003e${target}°C\u003c\/span\u003e\u003c\/li\u003e\n      \u003cli\u003eEffective Tolerance: \u003cspan style=\"color: #666;\"\u003e±${diff}°C\u003c\/span\u003e\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp style=\"font-size: 12px; color: #d9534f; margin-top: 10px;\"\u003e\u003cem\u003eSafety Advice: Ensure your \"Compressor Delay\" parameter is set to at least 3 minutes to prevent high-pressure restart damage.\u003c\/em\u003e\u003c\/p\u003e\n  `;\n}\n\u003c\/script\u003e\n\n\u003c!-- Structured Data --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How to fix E1 error on SHANGFANG SF-574?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The E1 error signals a probe failure. Inspect the NTC sensor wiring for loose connections or replace the probe if it is shorted or open.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why is my compressor short-cycling with the SF-574?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Short-cycling is caused by a low hysteresis (temperature differential) or lack of start-up delay. Increase the differential setting to at least 2°C.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does the defrost termination temperature do?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It ensures the defrost heater shuts off once the frost is melted (detected by the evaporator probe), preventing unnecessary cabinet heating.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"Koeed SF-574 Cycle Simulator\",\n  \"operatingSystem\": \"All\",\n  \"applicationCategory\": \"BusinessApplication\",\n  \"description\": \"Calculates refrigeration start\/stop points based on target temperature and hysteresis for SHANGFANG thermostats.\"\n}\n\u003c\/script\u003e","brand":"SHANGFANG","offers":[{"title":"Default Title","offer_id":44240241066169,"sku":"166726207208","price":103.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/s-l1600_770c74bd-17ad-48a3-803b-d095d5df57e9.png?v=1723684473","url":"https:\/\/koeed.com\/ar\/products\/shangfang-sf-574-sf574-temperature-controller-250vac","provider":"KOEED","version":"1.0","type":"link"}