EBM PAPST Centrifugal fan VHS0108XSHCZ 55667.27010

This is an EBM PAPST centrifugal fan, model VHS0108XSHCZ, SKU 55667.27010. It is designed for stable air supply to the combustion chamber and removal of combustion products in boilers, burners, and industrial heating equipment. The fan provides the optimal air-to-fuel ratio, supporting stable ignition and efficient combustion. It is installed in the air-gas train of premix burners and boilers. In room-sealed appliances, it also drives flue gases out through the heat exchanger and flue duct. The fan operates with low noise and vibration.

When replacing a centrifugal fan of this type, confirm that the required air flow and static pressure match, and that the outlet (scroll) direction and orientation, impeller diameter, supply voltage, and control mode (mains on/off, PWM, or 0–10 V analogue) are compatible. The flange pattern must match the burner mixing head or air intake. Also verify that mounting dimensions and electrical characteristics are the same as the original unit.

Typical failure modes include worn bearings causing noise or seizure, imbalance from dust or debris on the impeller blades, a failed run capacitor, or speed feedback errors that the boiler reports as an airflow fault. When such a fan fails, the equipment may lose combustion air or flue gas transport, leading to ignition problems or shutdown. Check the bearings, impeller cleanliness, capacitor, and speed feedback signal.