{"product_id":"viessmann-7816460","title":"Viessmann 7816460 Cad Cell","description":"\u003cp\u003eThe \u003cstrong\u003eViessmann 7816460 Cad Cell\u003c\/strong\u003e is a critical \u003cstrong\u003eflame sensor\u003c\/strong\u003e designed for precise \u003cstrong\u003eoil burner\u003c\/strong\u003e monitoring in residential and commercial heating systems. As a high-performance \u003cstrong\u003ecadmium sulfide photocell\u003c\/strong\u003e, this component acts as a vital safety interface, sensing light in the visible spectrum to verify ignition and continuous combustion. When the burner fires, the \u003cstrong\u003eViessmann cad cell\u003c\/strong\u003e resistance should typically drop below 1,600 ohms—often settling between 300 and 1,000 ohms in a well-adjusted system—allowing the primary control to maintain the fuel cycle. If the photo-eye detects a dark condition or excessive resistance, it triggers a safety lockout to prevent dangerous unburned fuel accumulation. Engineered for long-term stability and \u003cstrong\u003eOEM compatibility\u003c\/strong\u003e, this sensor features a durable glass-sealed design to protect the sensing disk from soot and moisture. Integrating this \u003cstrong\u003eflame detector\u003c\/strong\u003e into your maintenance routine ensures high-read accuracy and minimizes nuisance shutdowns caused by aging or fouled sensors.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsures reliable \u003cstrong\u003eflame detection\u003c\/strong\u003e for burner safety and sequence control.\u003c\/li\u003e\n  \u003cli\u003eOptimized for low-resistance signal output (typically under 1,600 ohms) during active combustion.\u003c\/li\u003e\n  \u003cli\u003eDurable \u003cstrong\u003ephotoconductive\u003c\/strong\u003e design resistant to typical combustion chamber heat and vibration.\u003c\/li\u003e\n  \u003cli\u003eDirect \u003cstrong\u003eOEM replacement\u003c\/strong\u003e for Viessmann oil-fired boiler systems, ensuring exact fit and terminal alignment.\u003c\/li\u003e\n  \u003cli\u003eEnables rapid troubleshooting of thermal lockout issues and burner ignition failures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the proper resistance range for a healthy Viessmann 7816460?\u003c\/strong\u003e\u003cbr\u003e\nIn a darkened chamber without flame, the resistance should be very high (often over 50k ohms). Once the flame is established, the sensing leads should show a drop to approximately 300–1,000 ohms. Readings consistently above 1,600 ohms during firing usually indicate a dirty sensor or misaligned burner.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow do I troubleshoot a suspected sensor lockout?\u003c\/strong\u003e\u003cbr\u003e\nInspect the sensor face for carbon buildup or soot. If clean, test the ohms across the yellow leads. If you see infinite resistance or an open circuit during sunlight exposure, the photocell or wiring may be compromised and requires replacement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan this sensor be used with other primary controls?\u003c\/strong\u003e\u003cbr\u003e\nWhile optimized for Viessmann configurations, this cad cell is compatible with standard oil primary controls that monitor the F-F terminals, provided the mounting bracket and lead length match the burner air tube specifications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\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":"Viessmann","offers":[{"title":"Default Title","offer_id":43504624500914,"sku":"7816460","price":81.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_b41ca1af-7078-4794-8e64-a5c064b80ce7.png?v=1752266944","url":"https:\/\/www.gsistore.com\/products\/viessmann-7816460","provider":"GSIstore","version":"1.0","type":"link"}