EBM PAPST Centrifugal fan NRV137/2000-3633-010204 55720.10000

This EBM PAPST centrifugal fan (model NRV137/2000-3633-010204, SKU 55720.10000) is a replacement for Beretta boilers including Condexa Pro3 230 IN, Power Plus Box 1002 P INT, Condexa Pro3 115 M, and Condexa Pro3 230 IN C 2 vie. It provides a tacho feedback signal compatible with the burner control. The fan supplies combustion air and drives flue gases out of the heat exchanger in room-sealed appliances, and its speed sets the firing rate in modulating premix burners.

Fans of this type are selected by matching required air flow at a given pressure, outlet direction and orientation, impeller diameter, supply voltage, and control mode (direct mains, PWM, or 0-10 V). The mounting flange pattern must match the boiler or burner chassis. Before ordering, compare mechanical dimensions and electrical connections with the original. Verify the control signal type accepted by the burner control; if the original used tacho feedback, the replacement must provide a compatible signal.

Typical failures include worn bearings, impeller imbalance from dust or debris deposits, a failed capacitor if fitted, and speed feedback errors. The burner control may interpret these issues as an airflow fault, often causing a lockout. Check for shaft play, unusual noise, and verify the speed feedback signal.