Danfoss Oil pump BFP21 R2 071N1176

The Danfoss BFP21 R2 oil pump is a gear pump designed for burners with fuel consumption up to 42 l/h. It operates within a pressure range of 7000–20000 mbar and includes a built-in filter with a filter area/cross-section of 11/200 cm2/microns. The pump is suitable for ambient temperatures from -20 to 70 °C, storage temperatures from -25 to 120 °C, and fuel temperatures from 0 to 70 °C. It has a protection class of IP40 and a shaft made of EN225 material. The maximum inlet pressure is 2000 mbar, and the maximum pressure in the suction/return line is 2 bar.

Parts of this type are selected by matching the pump's pressure range, fuel consumption, and shaft standard to the burner's requirements. The shaft standard (e.g., EN225) must align with the coupling, and the inlet pressure must not exceed the specified maximum. Before ordering, verify the pump's dimensions and mounting orientation to ensure compatibility with the existing fuel line connections.

Common failures include loss of pressure due to worn gears or a clogged filter, leading to burner ignition issues or unstable flame. Leaks may occur at seals or shaft, causing fuel drips. If the pump fails to prime, check the suction line for blockages or air leaks, and inspect the built-in filter for debris.