White-Rodgers 3098-156 Flame Sensor

The White-Rodgers 3098-156 is a professional-grade E-type mercury flame sensor engineered for precise flame proving in cycling pilot applications. Featuring a 48-inch capillary element and a Bulb Style #20, this SPDT switch serves as a high-performance replacement component for older, discontinued mercury sensors. It is specifically designed with a low-mass element to provide a short response time—typically between 30 and 45 seconds—making it the necessary choice for systems utilizing pre-purge cycles or fan delay timers. The 3-pin plug configuration ensures a secure interface with White-Rodgers cycling pilot gas valves, 36C cycle pilot series, and various OEM burner assemblies. As a primary safety control, the 3098-156 mercury flame sensor facilitates the safe opening of the main gas valve only after proving a stable pilot flame, maintaining rigorous industrial combustion standards. This unit includes a thermocouple adapter kit and retaining clips to simplify retrofitting into slip-in pilot burners.

Key Benefits for Technicians:

• Broad Cross-Compatibility: This unit is the direct replacement for a wide range of legacy part numbers, including 3098-122, 3098-126, 3098-127, 3098-130, 3098-131, 3098-142, 3098-143, 3098-149, 3098-153, 3098-168, 3098-171, 3094-174, 3098-175, and 3098-182.
• Optimized Response Timing: The low-mass element design ensures rapid pilot signal detection, preventing lockout or delayed ignition on modern cycling pilot systems.
• Universal Mounting Hardware: Ships with the F92-0623 adapter kit and C-ring lockrings, allowing for seamless integration into Honeywell or other competitive burner brands.
• High Thermal Tolerance: Rated for temperatures up to 1450°F at the bulb tip, ensuring durability in demanding furnace and boiler environments.
• Verified Electrical Ratings: Supports multi-voltage applications with ratings of 3 Amps at 24 VAC and up to 0.5 Amps at 240 VAC.

Common Questions from the Field:

Is the 3098-156 interchangeable with the 3098-134?
While both use a 48-inch element, the 3098-156 uses a low-mass element for faster response (30-45 sec), whereas the 3098-134 is high-mass (45-60 sec). Use the 156 model if your control system utilizes a fan delay or pre-purge to ensure the pilot is proven before the timer elapses.

Can I replace this sensor based on the gas valve model number?
No. Mercury sensors must be cross-referenced by the flame sensor part number itself. Different gas valves may share the same plug interface but require different bulb styles or response times.

Does this kit include the necessary mounting clips?
Yes, the bulbs on the 3098 series include grooves for the included C-rings, ensuring they seat properly in standard thermocouple-style pilot burners.

Disclaimer: 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.