{"product_id":"allied-air-27k79-furnace-limit-switch","title":"Allied Air 27k79 Furnace Limit Switch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ALLIED AIR 27k79 is a furnace high limit switch designed to protect heating systems from overtemperature conditions. When supply air or heat exchanger temperatures exceed a set threshold, the limit switch interrupts the burner circuit to prevent equipment damage and unsafe operating conditions. Licensed HVAC technicians install this control as part of routine furnace service or component replacement. It is a direct-fit part intended to restore safe, code-compliant furnace operation.\u003c\/p\u003e\u003cp\u003eThis limit switch is suited for residential gas furnace applications where the original high limit control has failed or is reading outside calibration. The raw title references Lennox and Armstrong Air branding, indicating cross-brand applicability within Allied Air Enterprises-affiliated equipment lines. Consult the furnace wiring diagram and OEM documentation to confirm correct temperature rating and mounting configuration before installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eInterrupts burner circuit on overtemperature to protect heat exchanger and related components\u003c\/li\u003e\n\u003cli\u003eOEM-style replacement designed for Allied Air, Armstrong Air, and related furnace platforms\u003c\/li\u003e\n\u003cli\u003eRestores safe high limit protection without system modification\u003c\/li\u003e\n\u003cli\u003eCompact form factor suitable for residential gas furnace installations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement high limit switch for residential gas furnaces within the Allied Air Enterprises family, which includes Armstrong Air and Lennox-affiliated product lines. Verify temperature rating and terminal configuration against the original part before installation.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician. Disconnect power to the furnace at the disconnect switch or breaker and confirm the gas supply is off before removing the existing limit switch. Follow the furnace manufacturer wiring diagram for correct terminal connections. Installation must comply with applicable local mechanical codes and IFGC requirements.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type\u003c\/strong\u003e: High Limit Switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Residential Gas Furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ALLIED AIR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 27k79\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ALLIED AIR","offers":[{"title":"Default Title","offer_id":51468651036978,"sku":"27K79","price":17.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/27K79.jpg?v=1783919828","url":"https:\/\/voomisupply.com\/products\/allied-air-27k79-furnace-limit-switch","provider":"Voomi Supply","version":"1.0","type":"link"}