{"product_id":"bard-hvac-8402-165bx-limit-switch","title":"Bard HVAC 8402-165BX Limit Switch","description":"\u003cp\u003eThe \u003cstrong\u003eBard HVAC 8402-165BX Limit Switch\u003c\/strong\u003e is a critical high-temperature safety component engineered for Bard wall-mount HVAC units and furnaces. This \u003cstrong\u003eL250-3F Auto Limit Switch\u003c\/strong\u003e is designed to monitor internal plenum temperatures, automatically opening the electrical circuit to shut down heating elements or burners if temperatures exceed the 250°F threshold. Its primary function is to prevent heat exchanger damage and ensure safe system operation during restricted airflow conditions.\u003c\/p\u003e\n\u003cp\u003eAs a veteran-grade \u003cstrong\u003eHVAC replacement part\u003c\/strong\u003e, the 8402-165BX features a 3-inch insertion depth and a fixed-temperature, snap-action bimetal disc for precise thermal response. This \u003cstrong\u003eBard 8402-165BX OEM limit\u003c\/strong\u003e serves as a direct replacement for various \u003cstrong\u003eBard HVAC safety switches\u003c\/strong\u003e, maintaining the integrity of the original equipment manufacturer (OEM) safety string. For technicians, this means a drop-in fit with standard terminal connections, reducing diagnostic time and ensuring the \u003cstrong\u003efurnace high limit control\u003c\/strong\u003e resets automatically once temperatures return to a safe operational range of 220°F (30°F differential).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Precision:\u003c\/strong\u003e Guaranteed compatibility with Bard wall-mount units to maintain original safety certifications and airflow logic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Reset:\u003c\/strong\u003e The L250-3F logic eliminates the need for manual resets, restoring system functionality automatically after cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSnap-Action Bimetal Disc:\u003c\/strong\u003e Provides a rapid, reliable break in the circuit to stop overheating before component fatigue occurs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built to withstand the high-cycle demands of commercial and industrial HVAC environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat causes this limit switch to trip frequently?\u003c\/strong\u003e\u003cbr\u003eFrequent tripping is almost always an airflow issue. Check for a dirty air filter, blocked return grilles, or a failing blower motor that isn't pulling enough CFM across the heat exchanger.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I bypass the 8402-165BX to keep the heat running?\u003c\/strong\u003e\u003cbr\u003eNo. As a technician, you know the limit switch is a safety device. Bypassing it can lead to heat exchanger cracks, fire hazards, or severe equipment damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I test if the L250-3F is faulty or just open?\u003c\/strong\u003e\u003cbr\u003eUse a multimeter to check for continuity across the terminals. If the switch is cool and shows an open circuit (OL), the internal bimetal disc is stuck or damaged and requires replacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Bard HVAC","offers":[{"title":"Default Title","offer_id":42885546606770,"sku":"8402-165BX","price":26.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/products\/Pic_addd03af-ace5-43de-b35f-43ada03ec164.png?v=1676590386","url":"https:\/\/www.gsistore.com\/en-ca\/products\/bard-hvac-8402-165bx-limit-switch","provider":"GSIstore","version":"1.0","type":"link"}