{"title":"Lennox Furnace High and Low Voltage Limit Switches | OEM High \u0026 Low Voltage OEM Safety Parts","description":"","products":[{"product_id":"lennox-73w20-limit-switch-l175-30f-175-f-open-on-rise-5-oal","title":"Lennox 73W20 Limit Switch L175-30F 175°F Open-on-Rise 5\" OAL","description":"\u003ch1\u003e\u003cspan\u003e Lennox 73W20 Limit Switch L175-30F 175°F Open-on-Rise 5\" OAL\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003eThe Lennox 73W20 is a genuine OEM limit control switch (L175-30F) designed for use in Lennox, Armstrong, and Allied Air furnaces. This critical safety component monitors the temperature within the heating system and automatically interrupts the electrical circuit if the temperature exceeds a safe limit, preventing overheating and potential damage to the heat exchanger. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety Assurance:\u003c\/strong\u003e Designed to open the circuit precisely at 175°F to protect the furnace from dangerous overheating conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Operation:\u003c\/strong\u003e Features an automatic reset function, allowing the system to resume operation once the temperature drops to the safe threshold of 145°F.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built with rugged metal materials to withstand the demanding thermal environment of a furnace.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect OEM Fit:\u003c\/strong\u003e Engineered for direct compatibility with numerous Lennox HVAC systems, simplifying installation and ensuring proper functionality. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e L175-30F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch Action:\u003c\/strong\u003e Open On Rise\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpening Temperature:\u003c\/strong\u003e 175°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Temperature:\u003c\/strong\u003e145°F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length \u003c\/strong\u003e(OAL): 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e   STILT (Surface Mount)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e Screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset Type:\u003c\/strong\u003e Automatic\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e🛠️ \u003cstrong\u003eHVAC Depot Pro Tip:\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eA faulty limit switch is a common cause of a furnace that cycles on and off repeatedly (\"short cycling\"). If your furnace is short cycling, use a multimeter to test continuity on this switch after the furnace has been running for a few minutes. If it opens prematurely (below 175°F), the switch is defective and requires replacement. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Lennox \/ Armstrong \/ Allied Air\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrawing\/X Numbers:\u003c\/strong\u003e 102857-07\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLegacy Numbers:\u003c\/strong\u003e 73W2001, 68J28, 68J2801, R102857-07 \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eModel Compatibility:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis safety switch fits numerous popular Lennox models, including: \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEL195UH045XE36B-01\u003c\/li\u003e\n\u003cli\u003eML193UH045XP36B-59\u003c\/li\u003e\n\u003cli\u003eLRP13GXK36-072-01\u003c\/li\u003e\n\u003cli\u003eVarious G-series and residential air handler units\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":52896738836843,"sku":"66255141841","price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/73W20.jpg?v=1770747482"}],"url":"https:\/\/tophvacparts.com\/collections\/lennox-furnace-high-and-low-voltage-limit-switches-oem-high-low-voltage-oem-safety-parts.oembed","provider":"HVAC Parts and Equipment Depot","version":"1.0","type":"link"}