Armstrong Fluid Technology UKD06853-811 Pump 321702-401 replacing the entire pilot assembly

replacing the entire pilot assembly with thermocouple is the standard industry practice to resolve carbon fouling or sensor degradation

Since this is a normally closed (NC) switch

Use a multimeter to check for 120V AC at the primary input

Enhanced Safety: Features a 100% gas shutoff mechanism and safe lighting protocols to prevent main gas flow during pilot ignition

making it suitable for larger commercial steam applications requiring rapid pressure relief

Armstrong Fluid Technology UKD06853-811 Pump 321702-401 replacing the entire pilot assemblyThe Armstrong Fluid Technology UKD06853 811 Pump is a high performance centrifugal pump engineered for precision fluid management in demanding HVAC systems and glycol make up units. Operating at a powerful 3 4HP motor output with a high speed 3600 RPM configuration, this unit is optimized for 115V single phase electrical environments. Built with a rugged cast iron body, the UKD06853 811 ensures long term structural integrity in residential,