Armstrong Fluid Technology 816303-317K Impeller Kit 318973-401 Using it on lower BTU

Using it on lower BTU models will result in over-firing and potential manifold failure

significantly reducing the risk of mineral buildup or mechanical failure

the 258860 provides a direct-fit solution that eliminates field modification guesswork

By keeping the crankcase temperature above the system's dew point

This OEM 220-240F auto limit switch functions as a normally closed thermostat disc that monitors heat exchanger temperatures to prevent thermal runaway

Armstrong Fluid Technology 816303-317K Impeller Kit 318973-401 Using it on lower BTUThe Armstrong Fluid Technology 816303 317K Impeller Kit is a precision engineered OEM replacement part designed to restore the hydraulic efficiency of high performance circulator pumps. This comprehensive kit features a 5. 25 inch Noryl impeller, a high strength thermoplastic known for its exceptional dimensional stability and resistance to corrosion and scaling in demanding HVACR systems. By utilizing an injection molded replacement impeller kit,