Danfoss BFPM 21 Data sheet

Data sheet

Oil Motor Pump type BFPM 21

Application	The BFPM range is a series of Danfoss oil pumps in
	combination with a highly efficient permanent
	magnet motor.
	The BFPM Electronic Controller must be used for
	controlling BFPM motor pumps (see separate data
	sheet for BFPM Electronic Controller).
	BFPM 21 is designed for small domestic oil
	burners up to 24 l/h.
Function

BFPM 21 features:

•Light oil and kerosene

•1- or 2-pipe operation

•1-stage

•Built-in pressure regulator

•Solenoid valve cut-off

•Cartridge filter

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Pressure	Suction	Return

From the suction inlet (S) oil is drawn through the filter (H) to the gear set, where the pressure is increased. When voltage is applied to the NC-valve, it opens and releases oil to the nozzle outlet.

By means of the diaphragm (D) in the pressure regulator (T), the pressure is kept constant at the value set on adjustment screw (P1).

In 2-pipe systems the excess oil is led back to the return outlet (R) and the tank.

In 1-pipe systems with plugged return outlet (R) and screw (A) removed, the oil is returned internally to the gear set (see figure).

Cut-off function, solenoid valve

When the burner stops, the voltage to the NC-valve is cut off and the oil flow to the nozzle outlet is cut off immediately.

Bleeding

In 2-pipe systems the pump is self-priming, i.e. bleeding is performed via the constriction (O) to the return outlet (R).

In 1-pipe systems with plugged return outlet (R), bleeding must be performed through the nozzle outlet (E) or the pressure gauge port (P).

Warranty

For pumps used outside the stated technical data and used with oil containing abrasive particles Danfoss cannot give any warranty.

Note! The solenoid valve must be replaced after 250.000 operations or 10 years (approved life expectancy).

© Danfoss | 2019.05

VD.DK.L3.02| 1

Data sheet

Oil Motor Pump type BFPM 21

Identification

Technical Data

BFPM

2

1

L

3

L

L:left hand nozzle outlet

3:capacity 24 l/h

L:left hand rotation

1:with one solenoid valve

2:cartridge filter, pressure adjustment on front

Nozzle capacity at 4.3 cSt., 10 bar, 2800 min-1

	Oil types	Standard fuel gas oil and fuel gas oil acc. to DIN V
		51603-6 EL A Bio-10 (Max. 10% FAME)
	Viscosity range (measured in suction inlet)	(1.3) 1.8 to 12.0 cSt. (mm2/s)
	Filter area/mesh	11 cm²/200 µm
	Pressure range1)	7 to 20 bar
	Default setting	10 ±1 bar
	Max. pressure in suction inlet/return outlet	2 bar
	Speed	400 to 3400 min-1
	Ambient/transport temperature	-20 to +70° C
	Temperature of medium	0 to +70° C
	Power supply/drive BFPM motor2)	230 V switched from controller
	Coil power consumption	9 W
	Coil rated voltage (other voltages on request)	220/240V, 50/60 Hz
	Coil enclosure	IP 40

1)Max. 12 bar at 1.3 cSt., max. 15 bar at 1.8 cSt.

2)Warning: Do not connect BFPM motor directly to 230 V/50 Hz power supply!

Nozzle capacity

Power consumption

2 | © Danfoss | 2019.05

VD.DK.L3.02