Honeywell BFW112 Operating And Maintenance Manual

BFW112

Operating and maintenance manual Bedienungs- und Instandhaltungsanleitung

Mobile Backflow Preventer B-FW in accordance with DIN 14346

Mobiler Systemtrenner B-FW nach DIN 14346

32337716-001

GB

1 Safety Guidelines . . . . . 3

2 Description of Function . 3

3 Technical Data . . . . . . . . 3

4 Scope of Delivery . . . . . 4

5 Options . . . . . . . . . . . . . 4

6 Assembly . . . . . . . . . . . . 4

7 Maintenance . . . . . . . . . 4

8 Cleaning . . . . . . . . . . . . 5

9 Disposal. . . . . . . . . . . . . 5

10 Troubleshooting. . . . . . . 6

11 Spare Parts . . . . . . . . . . 6

12 Accessories . . . . . . . . . . 6

13 Maintenance Report . . . 7

D

1 Sicherheitshinweise. . . . 8

2 Funktionsbeschreibung . 8

3 Technische Daten . . . . . 8

4 Lieferumfang . . . . . . . . . 9

5 Optionen . . . . . . . . . . . . 9

6 Montage. . . . . . . . . . . . . 9

7 Instandhaltung . . . . . . . . 9

8 Reinigung . . . . . . . . . . 10

9 Entsorgung . . . . . . . . . 10

10 Fehlersuche. . . . . . . . . 11

11 Ersatzteile . . . . . . . . . . 11

12 Zubehör . . . . . . . . . . . . 11

13 Instandhaltungsprotokoll12

Honeywell GmbH 2 MU0H-1264 GE23 R0818

GB

1 Safety Guidelines

1. Follow the installation instructions.

2. Use the appliance

• according to its intended use

• in good condition

• with due regard to safety and risk of danger.

3. Note that the appliance is exclusively for use in the
applications detailed in these installation instructions.
Any other use will not be considered to comply with
requirements and would invalidate the warranty.

4. Please take note that any assembly, commissioning,
servicing and adjustment work may only be carried out
by authorized persons.

5. Immediately rectify any malfunctions which may
influence safety.

2 Description of Function

BFW type backflow preventers are divided into 2 pressure
zones. The pressure in zone  is higher than in zone  . A
discharge valve positioned in zone  opens when the
differential pressure between zones  and  has dropped
to 0.14 bar at the very latest. The water from zone  is
discharged into the athmosphere, the check valve closes,
separating zone  from zone  .
In this way the danger of back pressure or back-siphonage
into the supply network is prevented. The water supply is
interrupted, and the drinking water network protected.

3 Technical Data

Media

Medium: Drinking water / quench water

Connections/Sizes

Connection: B-Storz

Rotatable on the input side
Fixed on output side

Hydraulic properties

Opening pressure: 0.5 bar
Max. inlet pressure: 16.0 bar

Liquid category in accordance with EN 1717

Liquid category: 4

Material

Housing Aluminium
Piston Aluminium
Seals EPDM

Weight

Weight 3 kg

Operating temperature

Max. operating temperature: 65°C

Specifications

Installation position: Horizontal up to inclanation

30°

Temperature of medium: Cold water

Note: The mobile backflow preventer BFW112 in accordance

with DIN 14346 is connected to existing standpipes or
pillar hydrants to take water for fire fighting from the
pipeline network. It prevents water from flowing back into
the drinking water supply network as a result of back
siphonage or back pressure, if the pressure in this
network is lower than that in the pipeline laid for
firefighting purposes.

In addition, pressure surges do not occur in the network,
which helps to prevent burst pipes.

MU0H-1264 GE23 R0818 3 Honeywell GmbH

GB

1

2

3457

8

6

4 Scope of Delivery

Overview Components Materials

1 Carry handle Aluminium
2 Storz coupling Aluminium
3 Dirt and fall protection NBR
4 Piston (inside)

Seals (inside)

5 Housing Aluminium
6 Stone trap Stainless steel
7 Counter grip Aluminium
8 Rotatable Storz coupling Aluminium

Aluminium
EPDM

5 Options

BFW112-65A

Connection type: Standard version, Storz 75-B connection, PN16, with handle grip and

counter grip

6 Assembly

6.1 Installation Guidelines

• Note flow direction

• Use both handles when assembling on hydrant /
standpipe

• Ensure that parts are free of dirt

• Store in a clean and dry place

• These armatures need to be maintained regularly

6.2 Assembly instructions

1. Thoroughly flush hydrant / standpipe

2. Check that backflow preventer connections are clean

3. Assemble backflow preventer

Position backflow preventer and, using both handles, rotate it
and the counter coupling on the hydrant/standpipe to connect
Note flow direction (indicated by arrow)

7 Maintenance

7.1 Inspection

The backflow preventer must undergo regular visual
inspections every 3 months at the latest. The following must
be checked:

• State of the coupling

• Dirt accumulation
– Stone trap
– Dust and fall protection
– Drainage holes
– Interior workings

If dirt has accumulated, clean with clear water without the
addition of detergents.
If any parts are damaged carry out a maintenance.

•

Honeywell GmbH 4 MU0H-1264 GE23 R0818

GB

Valve 1

Valve 3

Valve 2

7.2 Maintenance

Interval: every 12 months

Maintenance Report - see chapter 13

Test set-up

Mount the backflow preventer in the testing equipment. Open all the valves, to bleed the system. Close valve 3. Check that the
backflow preventer is sealed.

7.2.1 Inspection of check valve on input
side

1. Close valve 2

2. Wait 10 seconds and observe the differential pressure.

If it is constant, the check valve is airtight. Make a note

of the differential pressure
If the differential pressure = 0, the seal on the input side is
damaged or soiled. Follow the instructions in 7.2.3.

7.2.2 Inspection of discharge valve

1. Close valve 2

2. Close valve 1

3. Slowly open valve 3 and observe the differential

pressure. The discharge valve must respond (begin to

drop) before the differential pressure exceeds 0.14 bar.

Make a note of the differential pressure at which the

discharge valve responds (drops).
If the differential pressure is <0.14 bar at the response
moment, follow the instructions in 7.2.3.

MU0H-1264 GE23 R0818 5 Honeywell GmbH

7.2.3 Maintenance

Note: For exploded drawing see chapter 11

1. Fix the backflow preventer on the key area of the
housing and open the cover on the output side with the
help of a tape puller

2. Remove the springs and piston

3. Clean all interior parts and the running surface with
clear water and check that they are in good condition.

4. If necessary, exchange all seals and pistons. When
dismantling, ensure that the sealing faces in the base of
the groove are not damaged.

5. Lightly grease the seals.

6. Reassemble in reverse order.

7. Carry out points 7.2.1 and 7.2.2 for inspection.

8Cleaning

If necessary, clean the backflow preventer with clear water!
Do not use any chemicals or similar!

9 Disposal

see Chapter 4 Scope of Delivery

Observe the local requirements regarding correct
waste recycling/disposal!