{"product_id":"3l09-9","title":"3L09-9 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 190F","description":"\u003ch1\u003e3L09-9 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 190F\u003c\/h1\u003e\n\u003cstyle\u003e\na {\n    text-decoration: none;\n    color: #464feb;\n}\ntr th, tr td {\n    border: 1px solid #e6e6e6;\n}\ntr th {\n    background-color: #f5f5f5;\n}\n\u003c\/style\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003e3L09-9 Board Mount Limit Control (White-Rodgers \/ Copeland Comfort Control)\u003c\/strong\u003e is an automatic reset temperature safety switch designed to protect HVAC equipment, control boards, transformers, and electrical compartments from overheating. Featuring a \u003cstrong\u003e190°F fixed open temperature\u003c\/strong\u003e and \u003cstrong\u003e170°F fixed close temperature\u003c\/strong\u003e, this compact \u003cstrong\u003eboard-mounted 1\/2-inch bimetal disc limit switch\u003c\/strong\u003e interrupts the circuit when excessive temperatures are detected and automatically restores operation after cooling. Its \u003cstrong\u003e3.12-inch insertion length\u003c\/strong\u003e provides reliable temperature sensing for OEM and replacement applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3L09-9\u003c\/li\u003e\n\u003cli\u003e3L099\u003c\/li\u003e\n\u003cli\u003eL190F\u003c\/li\u003e\n\u003cli\u003e74T11 Series\u003c\/li\u003e\n\u003cli\u003eWhite-Rodgers 3L09-9\u003c\/li\u003e\n\u003cli\u003eCopeland Comfort Control 3L09-9\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eDirect OEM\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhite-Rodgers 3L09-9\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCompatible Brands\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWhite-Rodgers\u003c\/li\u003e\n\u003cli\u003eEmerson\u003c\/li\u003e\n\u003cli\u003eCopeland\u003c\/li\u003e\n\u003cli\u003eYork\u003c\/li\u003e\n\u003cli\u003eColeman\u003c\/li\u003e\n\u003cli\u003eLuxaire\u003c\/li\u003e\n\u003cli\u003eGoodman\u003c\/li\u003e\n\u003cli\u003eRheem\u003c\/li\u003e\n\u003cli\u003eUniversal HVAC Applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cp\u003eUsed in HVAC and electrical equipment to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eProtect control boards from overheating\u003c\/li\u003e\n\u003cli\u003eOpen safety circuits at 190°F\u003c\/li\u003e\n\u003cli\u003eAutomatically reclose at 170°F\u003c\/li\u003e\n\u003cli\u003eProtect transformers and electrical enclosures\u003c\/li\u003e\n\u003cli\u003ePrevent temperature-related component failures\u003c\/li\u003e\n\u003cli\u003eProvide automatic thermal protection for HVAC controls\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eRelated Components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBoard Mount Limit Switch\u003c\/li\u003e\n\u003cli\u003eSnap Disc Thermostat\u003c\/li\u003e\n\u003cli\u003eFurnace Control Board\u003c\/li\u003e\n\u003cli\u003eTransformer\u003c\/li\u003e\n\u003cli\u003eBlower Relay\u003c\/li\u003e\n\u003cli\u003eHigh Limit Control\u003c\/li\u003e\n\u003cli\u003eTemperature Sensor\u003c\/li\u003e\n\u003cli\u003eSafety Cutoff Switch\u003c\/li\u003e\n\u003cli\u003eElectrical Control Assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnician Notes\u003c\/h3\u003e\n\u003cp\u003eThe 3L09-9 is an \u003cstrong\u003eautomatic reset, open-on-rise board mount limit control\u003c\/strong\u003e utilizing a \u003cstrong\u003e1\/2-inch bimetal sensing disc\u003c\/strong\u003e and \u003cstrong\u003e3.12-inch insertion length\u003c\/strong\u003e. The contacts remain closed during normal operation and open when the sensing temperature reaches \u003cstrong\u003e190°F\u003c\/strong\u003e, interrupting the circuit to prevent overheating. Once temperatures decrease to approximately \u003cstrong\u003e170°F\u003c\/strong\u003e, the contacts automatically reset and restore operation.\u003c\/p\u003e\n\u003cp\u003eThis style of limit control is commonly used for protecting control boards, transformer compartments, electrical enclosures, air handlers, and OEM HVAC equipment requiring compact, dependable temperature protection.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCommon Symptoms of Failure\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eEquipment shuts down unexpectedly\u003c\/li\u003e\n\u003cli\u003eOpen safety circuit faults\u003c\/li\u003e\n\u003cli\u003eIntermittent operation\u003c\/li\u003e\n\u003cli\u003eRepeated high-temperature shutdowns\u003c\/li\u003e\n\u003cli\u003eControl board overheating faults\u003c\/li\u003e\n\u003cli\u003eNo continuity through switch contacts\u003c\/li\u003e\n\u003cli\u003eFailure to reset properly\u003c\/li\u003e\n\u003cli\u003eElectrical compartment overheating\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect power before servicing.\u003c\/li\u003e\n\u003cli\u003eVerify the replacement temperature ratings match the original part.\u003c\/li\u003e\n\u003cli\u003eConfirm switch action is \u003cstrong\u003eOpen on Rise\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eEnsure proper insertion depth during installation.\u003c\/li\u003e\n\u003cli\u003eInspect terminals for heat damage or corrosion.\u003c\/li\u003e\n\u003cli\u003eVerify adequate airflow around electrical components.\u003c\/li\u003e\n\u003cli\u003eCheck continuity after installation.\u003c\/li\u003e\n\u003cli\u003eTest operation through a complete equipment cycle.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch3\u003eRecommended Inspection Items\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eControl board condition\u003c\/li\u003e\n\u003cli\u003eTransformer temperature\u003c\/li\u003e\n\u003cli\u003eWiring harness connections\u003c\/li\u003e\n\u003cli\u003eElectrical terminals\u003c\/li\u003e\n\u003cli\u003eBlower motor operation\u003c\/li\u003e\n\u003cli\u003eAirflow restrictions\u003c\/li\u003e\n\u003cli\u003eVentilation around controls\u003c\/li\u003e\n\u003cli\u003eRelay condition\u003c\/li\u003e\n\u003cli\u003eEquipment operating temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eControls, Temperature, 190 degrees F Fixed Open Temperature, 170 degrees F Fixed Close Temperature, Open on Rise Switch Action, Auto Reset, 3.12\" Insertion Length, Board Mounted 1\/2\" Bimetal Disc Limit Switch\u003c\/span\u003e\u003c\/p\u003e","brand":"Neuco","offers":[{"title":"Default Title","offer_id":45887390974018,"sku":"3L09-9","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot2026-11-03111735_6428943b-df24-4134-b5ac-c89d18ff1cc0.png?v=1793730037","url":"https:\/\/hvacpartstore.com\/products\/3l09-9","provider":"HVACpartstore","version":"1.0","type":"link"}