De Dietrich Impeller 300017022 180x90mm

This De Dietrich Impeller 300017022 is a spare part for a fan assembly used in boilers and burners. Impellers of this type are the rotating component that draws in combustion air and, in room-sealed appliances, also expels flue gases. In modulating premix boilers, the fan speed determines the firing rate; the burner control varies the speed and the gas valve follows accordingly. When selecting a replacement impeller, the key parameters are the required air flow and pressure, the direction of the outlet, the impeller diameter, and the voltage and control mode (mains, PWM, or 0-10 V). The flange pattern must also match the existing fan housing. Typical failures in such impellers include worn bearings, imbalance caused by dust or deposits on the blades, a failed capacitor in the fan motor, or speed feedback errors that the boiler interprets as an airflow fault. Before replacing, check that the impeller rotates freely and that there is no visible damage or deformation. Ensure the new part matches the original in diameter and mounting dimensions to maintain correct airflow and pressure. The catalogue article number 336.448.004 and manufacturer codes 300017022 and 336.448.004 identify this specific De Dietrich impeller.