Danfoss BFPM 21 Data sheet

Dan

70-1122.11

.13

Data sheet

Oil Motor Pump type BFPM 21

Application

Function

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.

BFPM 21 features:

• Light oil and kerosene

• 1- or 2-pipe operation

• 1-stage

• Built-in pressure regulator

• Solenoid valve cut-off

• Cartridge filter

O

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.

foss

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

Oil types

-1

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 range

1)

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 motor

2)

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