Danfoss BFP Oil Pump Installation Guide

Brand: Danfoss

Introduction

This document provides installation, maintenance, and technical information for the Danfoss BFP series oil pumps. It covers various models including BFP 11, BFP 20, BFP 21, and BFP 41.

Port and Symbol Legend (Fig. 1-4)

Fig. 1-4: Port and Symbol Legend

Symbol	English Description
P₁	Pressure regulation
S	Suction line (G 1/4)
R	Return line (G 1/4)
F	Nozzle connection (G 1/8)
V	Vacuum meter connection (G 1/8)
P	Pressure gauge connection (G 1/8)
[Filter Symbol]	Cartridge filter

System Configurations: 1-Pipe vs. 2-Pipe Operation (Fig. 7-8)

Fig. 7-8: System Configuration Diagrams

The diagrams illustrate connections for 1-pipe and 2-pipe systems. Descriptions are provided for different languages, but the core configurations are:

1-Pipe System: Typically uses a screw with a washer or without a screw, depending on the specific model or setup.
2-Pipe System: Typically uses a screw without a washer or with a fitted screw.

Detailed descriptions for each language are available in the original document, focusing on screw types and system setup.

Technical Specifications

General Oil Pump Data (BFP 11, BFP 20/21/41)

Specification	Value
Oil Types	Standard fuel gas oil and fuel gas oil acc. to DIN V 51603-6 EL A Bio 10
Viscosity Range	(1.3) 1.8-12 mm²/s (cSt)
Speed (BFP 11)	Type 5: 1400-3450 min⁻¹
Speed (BFP 20/21/41)	Type 3: 2400-3450 min⁻¹
Pressure Range (BFP 11)	7-15 bar
Pressure Range (BFP 20/21/41)	7-20 bar
Factory Setting	10 bar
Coil Voltage	220/240 V, 50/60 Hz
Coil Enclosure	IP 40
Medium Temperature	0 to 70° C
Pressure Range Note	Max. 12 bar at 1.3 cSt., max. 15 bar at 1.8 cSt.

Nozzle Capacity Tables

Nozzle Capacity at P = 0 kPa

H (m)	Ø4 mm			Ø5 mm			Ø6 mm
H (m)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)
4.0	51	100	100	26	62	100	31	65	100
3.5	45	100	100	22	55	100	27	57	100
3.0	38	94	100	19	47	97	23	49	100
2.5	32	78	100	16	39	81	20	40	100
2.0	26	62	100	13	31	65	16	32	100
1.5	19	47	97	10	23	49	12	24	77
1.0	13	31	65	6	16	32	8	16	51
0.5	6	16	32	3	8	1	4	8	26

Nozzle Capacity at P = 35 kPa

H (m)	Ø4 mm			Ø5 mm			Ø6 mm
H (m)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)
4.0	100	100	100	51	100	100	62	100	100
3.5	95	100	100	48	100	100	58	100	100
3.0	89	100	100	45	100	100	54	100	100
2.5	83	100	100	41	100	100	51	100	100
2.0	77	100	100	38	94	100	47	97	100
1.5	71	100	100	35	86	100	43	89	100
1.0	64	100	100	32	79	100	39	81	100
0.5	58	100	100	29	71	100	35	73	100

Nozzle Capacity at P = 35 kPa (Continued)

H (m)	Ø4 mm			Ø5 mm			Ø6 mm
H (m)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)	(kg/h)
0	52	100	100	26	63	100	32	66	100
-0.5	46	100	100	23	56	100	28	58	100
-1.0	40	97	100	20	48	100	24	50	100
-1.5	33	81	100	17	41	84	20	42	100
-2.0	27	66	100	14	33	69	17	34	100

Flow Rates for BFP 3 and BFP 5 Pumps (2800 min⁻¹)

H (m)	BFP 3 (Ø6 mm, Ø8 mm, Ø10 mm)			BFP 5 (Ø6 mm, Ø8 mm, Ø10 mm)
H (m)	Ø6 mm	Ø8 mm	Ø10 mm	Ø6 mm	Ø8 mm	Ø10 mm
4.0	33	100	100	21	67	100
3.5	31	98	100	20	63	100
3.0	29	91	100	19	59	100
2.5	27	85	100	17	55	100
2.0	25	79	100	16	51	100
1.5	23	72	100	15	46	100
1.0	21	66	100	13	42	100
0.5	19	60	100	12	38	94
0	17	53	100	11	34	84
-0.5	15	47	100	10	30	74
-1.0	13	41	99	8	26	64
-1.5	11	34	84	7	22	54
-2.0	9	28	68	6	18	44
-2.5	7	22	53	4	14	34
-3.0	5	15	37	3	10	24
-3.5	3	9	22	2	6	14
-4.0	1	3	6	1	2	4

Installation and Maintenance

Connections (Fig. 1-4)

Refer to the port and symbol legend above for connection types.

Bleeding

Bleeding the oil pump is only necessary with 1-pipe systems. In 2-pipe systems, the pump is automatically bled through the return pipe.

Filter Cleaning/Replacement

Ring Filter (Fig. 5):

Remove the four screws (4 mm hex key).
Take off the cover.
The filter can then be taken out for cleaning or replacement.

Cartridge Filter (Fig. 6):

Unscrew the filter plug in the cover with a 4 mm key and pull out the cartridge filter.
If necessary, insert a screwdriver between the filter and plug and carefully twist the filter out.
Discard the old filter and press a new one onto the plug.
Reassemble the cartridge filter and tighten lightly.

Changeover Between 1-Pipe and 2-Pipe Operation (Fig. 7-8)

Detailed instructions for changing between 1-pipe and 2-pipe operation are provided in the original document, referencing figures 7 and 8.

Suction Line Lengths

Tables for suction line lengths are provided in the original document. These tables apply to standard fuel gas oil (Heizöl-EL) of normal commercial quality.

Important: When starting a system with empty piping, the oil pump should not be allowed to operate without oil for more than 5 minutes.

Important Notes

The BFP 20 models are without a solenoid valve. These oil pumps are intended for use only with oil burners.
The solenoid valve must be replaced after 250,000 operations or 10 years (approved life expectancy).

Contact Information

Danfoss A/S

Climate Solutions

Website: danfoss.com

Phone: +45 7488 2222

Any information, including, but not limited to information on selection of product, its application or use, product design, weight, dimensions, capacity or any other technical data in product manuals, catalogues descriptions, advertisements, etc. and whether made available in writing, orally, electronically, online or via download, shall be considered informative, and is only binding if and to the extent, explicit reference is made in a quotation or order confirmation. Danfoss cannot accept any responsibility for possible errors in catalogues, brochures, videos and other material. Danfoss reserves the right to alter its products without notice. This also applies to products ordered but not delivered provided that such alterations can be made without changes to form, fit or function of the product. All trademarks in this material are property of Danfoss A/S or Danfoss group companies. Danfoss and the Danfoss logo are trademarks of Danfoss A/S. All rights reserved.

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