and S8670 ignition modules

the VST4800 supports Title 24 compliance and refined HVAC energy management across large-scale retail

This part is widely used in larger Reznor unit heaters

Noise and Vibration Reduction: Engineered to stabilize the blower assembly

Williams 7699 Limit Switch 321042-401 and S8670 ignition modulesThe Williams 7699 Limit Switch is a critical OEM safety device designed for furnace overheat protection in professional heating applications. Engineered for precision, this L95 10F limit switch features a 95F high limit cut out with a 10F differential, ensuring the combustion chamber remains within safe operating parameters. As a veteran grade replacement furnace part, the 7699 model is built to handle the rigorous duty cycles of Williams gas fired