De Dietrich 200022126 turbine 225x100x19

This part is a fan impeller (turbine) listed under De Dietrich with manufacturer codes 200022126 and 336.448.002. Its dimensions are 225 x 100 x 19, which indicate an outer diameter of 225 mm, a height of 100 mm, and a hub or bore dimension of 19 mm. Impellers of this type are mounted on the fan shaft to generate the airflow required for combustion. In a modulating premix boiler, the fan speed is used to set the firing rate, with the gas valve following the airflow. The impeller must be matched to the fan housing and motor to deliver the correct air flow and pressure for the burner. When selecting a replacement, key parameters include the impeller diameter, the direction of rotation, the orientation of the outlet, and the fixing method to the motor shaft. Common failure modes include imbalance due to dust or debris build-up on the blades, worn bearings in the motor, and capacitor failure. A damaged or dirty impeller can reduce airflow, leading to poor combustion, nuisance lockouts from airflow pressure switches, or incomplete flue gas evacuation in room-sealed appliances. If speed feedback errors occur, the burner control may report an airflow fault even if the impeller appears intact. When replacing, check that the new impeller is clean and free of deformation, and verify that it is securely fixed and balanced on the motor shaft.