EBM PAPST Centrifugal fan 4656 N 9274014139

The EBM PAPST 4656 N is a centrifugal fan with SKU 9274014139, designed for use in modulating premix burners. It operates at a rotation speed of 2650 rpm, delivers an airflow of 160 m³/h, and has a current consumption of 0.08 A. The fan measures 119 x 119 x 38 mm and features a compact design to save space in devices. It is used to supply combustion air and, in room-sealed appliances, to drive out flue gases. The fan's speed sets the firing rate in modulating premix burners, with the burner control varying the fan speed and the gas valve following accordingly.

When selecting a replacement fan of this type, key parameters to match include air flow and static pressure, the direction and orientation of the outlet, impeller diameter, voltage, and control mode (mains, PWM, or 0-10 V). The flange pattern must also match the mounting. Verify compatibility through the original equipment data, as parts of this type are often specific to the appliance design. Ensure the replacement fan matches the original in these parameters before installation.

Typical failures include worn bearings, imbalance from deposits on the impeller, a failed capacitor, and speed feedback errors that the control reports as an airflow fault. When such failures occur, the equipment may exhibit reduced airflow, unusual noise, or error codes related to airflow. Check the fan's bearings, impeller cleanliness, capacitor condition, and speed feedback signal.