{"product_id":"3l09-20-copeland-comfort-control-white-rodgers-board-mount-limit-control-240f-7-5","title":"3L09-20 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 240F 7.5\"","description":"\u003ch1\u003e3L09-20 Copeland Comfort Control (White Rodgers) Board Mount Limit Control 240F 7.5\"\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\u003e3L09-20 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, electric heat assemblies, and electrical compartments from overheating. Featuring a \u003cstrong\u003e240°F fixed open temperature\u003c\/strong\u003e and an extended \u003cstrong\u003e7.5-inch insertion length\u003c\/strong\u003e, this compact board-mounted bimetal limit switch interrupts the circuit when excessive temperatures are detected and automatically restores operation after cooling, helping ensure safe and reliable equipment performance.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3L09-20\u003c\/li\u003e\n\u003cli\u003e3L0920\u003c\/li\u003e\n\u003cli\u003eL240F\u003c\/li\u003e\n\u003cli\u003eWhite-Rodgers 3L09-20\u003c\/li\u003e\n\u003cli\u003eCopeland Comfort Control 3L09-20\u003c\/li\u003e\n\u003cli\u003e74T Series Board Mount Limit Control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eDirect OEM\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhite-Rodgers 3L09-20\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\u003eInterrupt safety circuits at elevated temperatures\u003c\/li\u003e\n\u003cli\u003eAutomatically restore operation after cooling\u003c\/li\u003e\n\u003cli\u003eProtect transformers and electrical enclosures\u003c\/li\u003e\n\u003cli\u003eSafeguard electric heat assemblies\u003c\/li\u003e\n\u003cli\u003ePrevent temperature-related component failures\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\u003eElectric Heat Control Assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eTechnician Notes\u003c\/h3\u003e\n\u003cp\u003eThe 3L09-20 is an \u003cstrong\u003eautomatic reset, open-on-rise board mount limit control\u003c\/strong\u003e utilizing a compact bimetal sensing disc and an extended \u003cstrong\u003e7.5-inch insertion probe\u003c\/strong\u003e. The contacts remain closed during normal operation and open when the sensing temperature reaches \u003cstrong\u003e240°F\u003c\/strong\u003e, interrupting the circuit to prevent overheating. Once temperatures fall below the reset point, the contacts automatically reclose and restore operation.\u003c\/p\u003e\n\u003cp\u003eThe extended insertion length allows the switch to monitor temperatures deeper within electric heat sections, air handlers, control compartments, and OEM HVAC assemblies where standard probes may not reach the desired sensing location.\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\u003eElectric heat lockouts\u003c\/li\u003e\n\u003cli\u003eIntermittent HVAC operation\u003c\/li\u003e\n\u003cli\u003eRepeated thermal 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\u003eExcessive compartment temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect electrical power before servicing.\u003c\/li\u003e\n\u003cli\u003eVerify the replacement temperature rating matches the original control.\u003c\/li\u003e\n\u003cli\u003eConfirm switch action is \u003cstrong\u003eOpen on Rise\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eVerify the 7.5-inch insertion length is correct for the application.\u003c\/li\u003e\n\u003cli\u003eSecure the sensing probe fully into the original location.\u003c\/li\u003e\n\u003cli\u003eInspect terminals for corrosion or heat discoloration.\u003c\/li\u003e\n\u003cli\u003eTest continuity after installation.\u003c\/li\u003e\n\u003cli\u003eVerify operation through a complete heating 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\u003eElectric heat elements\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\u003eRelay condition\u003c\/li\u003e\n\u003cli\u003eVentilation around controls\u003c\/li\u003e\n\u003cli\u003eProbe placement depth\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eControls, Temperature, 240 degrees F Fixed Open Temperature, 210 degrees F Fixed Close Temperature, Open on Rise Switch Action, Auto Reset, 7.12\" Insertion Length, Board Mounted 1\/2\" Bimetal Disc Limit Switch\u003c\/span\u003e\u003c\/p\u003e","brand":"Neuco","offers":[{"title":"Default Title","offer_id":45887391465538,"sku":"3L09-20","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1071\/8320\/files\/Screenshot2026-11-03132641.png?v=1793737757","url":"https:\/\/hvacpartstore.com\/products\/3l09-20-copeland-comfort-control-white-rodgers-board-mount-limit-control-240f-7-5","provider":"HVACpartstore","version":"1.0","type":"link"}