EBM PAPST Centrifugal fan RG148/1200-3612-010207 55667.21301

The EBM PAPST RG148/1200-3612-010207 is a centrifugal fan with SKU 55667.21301, designed for use in ACV BG 2000-S25, S35, S45, S55, S60, and S70 burners. It supplies combustion air and, in room-sealed appliances, drives flue gases out of the system. In modulating premix boilers, the fan's speed sets the firing rate, with the burner control varying fan speed and the gas valve following proportionally. This fan is central to both air supply and output modulation.

When selecting a replacement fan of this type, key parameters to match include air flow and pressure at the operating point, direction and orientation of the outlet, impeller diameter, supply voltage, and control mode (mains on/off, PWM, or 0-10 V analogue). The flange pattern must also match the mounting on the burner or boiler. Always verify physical fit, electrical supply, and control signal compatibility before ordering.

Common failure modes include worn bearings, imbalance caused by deposits on the impeller, a failed run capacitor, and speed feedback errors that the boiler control interprets as an airflow fault. When such failures occur, the equipment may exhibit reduced airflow, unusual noise, or error codes related to air supply or modulation.