SAB F450 User manual

Operation manual
Automatic Backflush Filter F450
Translation of the original instructions

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-1
0 Scope
0.1 Structure and use of the operation manual
Present operation manual
Automatic Backflush Filter F450
Version: 1.3
Manufacturer: Georg Schünemann GmbH
Buntentorsdeich 1
D-28201 Bremen
Telefon: ++49-0421-5 59 09-0
Telefax: ++49-0421-5 59 09-40
E-Mail: [e-mail]
The manual is published in according to the specification of the Machine
Directive 2006/42/EC. The
p
pa ag ge es s
are continuously numbered and the issue date
is placed in the footnote.
The manual describes the automatic backflush filter F450 and the handling of the
equipment.
This manual is to be kept for future use!
Copyright © by Georg Schünemann GmbH, Bremen.
All rights reserved.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-2
0.2 Table of contents
0Scope 0-1
0.1 Structure and use of the operation manual 0-1
0.2 Table of contents 0-2
0.3 List of illustrations 0-4
0.4 List of tables 0-4
0.5 List of abbreviations 0-4
0.6 Intended and improper use 0-5
0.7 Necessary diligence of the operator 0-6
0.8 Qualification and education of staff 0-7
0.9 Liability 0-8
1Safety 1-1
1.1 Symbols 1-1
1.2 Basic safety instructions 1-2
1.3 Accident prevention rules 1-5
1.3.1 General 1-5
1.3.2 Assembly and disassembly 1-5
1.3.3 Transport/Location 1-5
1.3.4 Electrical system 1-6
1.3.5 Compressed air system 1-6
1.3.6 Safety at setting out of operation 1-7
1.3.7 Maintenance and repair 1-7
1.4 Operation 1-8
2Description 2-1
2.1 General description 2-1
2.2 Technical description 2-1
2.2.1 Description of the operational functions 2-2
2.2.2 Control of the automatic backflush filter F450 2-4
3General data 3-1
3.1 Signs and name plates 3-1
3.2 Sound emission 3-2
4Installation and setting to work 4-1
4.1 Before installation 4-1
4.2 Unpack 4-2
4.3 Installation 4-3
4.4 Steps for setting into operation 4-5
4.5 Setting into operation 4-6
4.6 Testing and adjusting of the operating parameters 4-7
4.6.1 Switch on control with the power switch, first flushing phase/pre-flushing
check 4-7
4.6.2 Setting the running time of the pneumatic cylinder to operating
conditions, second flushing phase / filtration 4-7
4.6.3 Check of proper terminating of flushing 4-8
4.6.4 Adjustment of flushing interval T1 at the electronic control 4-8
4.6.5 Optional: Lead time for flushing T4 and flushing valve end position
control T5 (throttle time) 4-8
4.6.6 Adjustment of time and date 4-9
4.6.7 Operating parameter 4-9
5Service and operation 5-1

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-3
6Maintenance 6-1
6.1 Cleaning of strainer insert 6-1
6.2 Flushing disc 6-1
6.3 Pneumatic cylinder 6-2
6.4 Seals 6-2
7Error search and trouble shooting 7-1
8Disassembly and disposal 8-1
8.1 Disassembly 8-1
8.2 Disposal 8-1
8.2.1 General regulations for disposal 8-1
9Illustrations 9-1
Appendix
Acceptance report
Declaration of conformity
Drawings
Parts lists
Documentation purchase parts
- Filter control
- Pneumatic cylinder
- Shut-off valve/actuator
- Differential pressure switch/transmitter
- Proximity sensors
- Solenoid valves
- etc.
Terminal connections junction box (optional)
Additional documentation for operation in EX-areas (optional)

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-4
0.3 List of illustrations
Fig. 3-1 Name plate Standard........................................................................................3-1
Fig. 9-1 Components of F450 (G 1/8)............................................................................9-1
Fig. 9-2 Manual control elements and connections of the control unit (G 1/8)................9-2
Fig. 9-3 Components of F450 (G 3/8)............................................................................9-3
Fig. 9-4 Manual control elements and connections of the control unit (G 3/8)................9-4
Fig. 9-5 Air and water connections ................................................................................9-5
0.4 List of tables
Table 4-1 Alignment of the operating parameter...............................................................4-9
0.5 List of abbreviations
AC
Alternating Current
DC
Direct Current
DDS
DDT
Differential pressure switch
Differential pressure transmitter
etc.
et cetera
GND
Ground
LS1
Proximity Switch Piston 1
LS2
Proximity Switch Piston 2
T1
Interval Time
T2
Pre-Flushing Time
T3
Stroke Time
T4
Lead Time
T5
Throttle Time
SV1
Solenoid Valve 1 Flushing Valve
SV2
Solenoid Valve 2 Piston
KS1
Optional End position Switch, Flushing valve closed
KS2
Optional End position Switch, Flushing valve open

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-5
0.6 Intended and improper use
The automatic backflush filter F450 exclusively serves for the filtration of the op-
erating medium indicated in the acceptance report. The admissible operational
data registered on the name plate are to be kept. The filter satisfies the require-
ments of the EC Pressure Equipment Directive 97/23/EC and the ATEX-Directive
94/9/EC.

Reading this operation manual as well as keeping all references contained in,
appertain to the intended use. That applies in particular to the notes of cau-
tion!

Furthermore the requirement to strictly follow the operating instructions, the
inspections and maintenance regulations.

Any malfunction possibly impairing the safety must be cleared immediately!

The filter is designed for continuous operating parameters. After longer shut-
down periods the filter insert must be cleaned before a renewed start-up, if
necessary.
Any other use or any use going beyond the rules (e.g. at higher operating tem-
peratures or operating pressures) will be regarded as an improper use, whereby
the declaration of conformity will lose the validity. The manufacturer will not be li-
able for any damage resulting there from. The user of the automatic backflush fil-
ter F450 is responsible for all property and personal damage which develop from
not intended use.
The automatic backflush filter F450 is designed according to the state of the art
and the recognized safety-relevant rules. Nevertheless, its use might cause dan-
ger to the users or third person’s lives and limbs or impair the filter or other intrin-
sic values.
In order to avoid damage or lethal injuries with the use of the automatic backflush
filter F450, the following points are to be considered:

The filter has to be used only in a technically faultless condition and accord-
ing to intended purpose.

Inform yourself about the correct operating before switching on of the device.

Read the chapter 1 "safety".

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-6
0.7 Necessary diligence of the operator
Please keep this operation manual carefully field and handy at the locations
where the filter will be used.
Please follow generally effective legal and other binding regulations with regard
to the prevention of accidents and the protection of the environment as a sup-
plement to this operation manual. Such binding regulations may e.g. equally con-
cern the use of hazardous materials or the availability/wearing of personal protec-
tive equipment.
Ensure that these operating instructions are supplemented by further instructions
including the supervisory and report duties taking into consideration particular
operational features, e.g. regarding the structuring of operations, operational se-
quences and the staff employed.
Prior to starting their work, the personnel in charge of the operation of the ma-
chine must have read the operating instructions and in particular the chapter
„Safety Rules“ in detail. This will particularly apply to any personnel working only
occasionally at the filter, e.g. while setting it up or maintaining it. At least some
time or other, the staff should be controlled if they were in fact working in a safety
relevant manner, being fully aware of possible dangers and following the operat-
ing instructions.
Please follow all the instructions at the filter with regard to safety and dangers.
In case of any safety-relevant modifications regarding the filter or operational per-
formance, the filter has be to be shut down immediately and report this malfunc-
tion to the competent department.
No modifications, attachments or alterations may be carried out at the filter with-
out obtaining the relevant permission from Georg Schünemann GmbH first. This
will equally apply to the installation and the adjustment of safety devices and
safety valves as well as the welding at pressurized vessel.
Any spare parts must comply with the technical requirements stipulated by the
manufacturer, which will always be guaranteed for genuine spare.
The program of the programmable control systems must never be modified.
At any rate, the time intervals for recurrent tests/inspections laid down or indicat-
ed in the operating instructions should be kept.
An adequate protective clothing and workshop outfit for the maintenance work
will be absolutely indispensable.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-7
0.8 Qualification and education of staff
Only reliable personnel should be allowed to perform any work at the filter.
The legal minimum age should be taken into account!
Employ only trained or instructed personnel and the relevant responsibilities of
the staff for the operational, setup, maintenance, and repair work has to be stipu-
lated clearly!
Any personnel to be trained at, semi-skilled at, or familiarized with this work or
working within the scope of a general training only has to be permitted to be ac-
tive with regard to the filter under permanent supervision of an experienced per-
son!
Any work in connection with the electrical equipment of the filter must either be
carried out by a skilled electrician or by instructed persons according to the elec-
tro technical rules under the guidance and supervision of a skilled electrician on-
ly.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 0-8
0.9 Liability
Generally our current "general terms of delivery and sales" apply.
Guarantee and liability claims with damages to property and person are exclud-
ed, if they are to due several of the following causes:

Not intended use of the automatic backflush filter F450!

Inappropriate mounting, starting up, operation and maintenance of the au-
tomatic backflush filter F450!

Operation of the automatic backflush filter F450 with defective safety devic-
es!

Nonobservance of the notices in the operation manual of the automatic
backflush filter F450 concerning operation, maintenance, servicing and
troubleshooting!

Nonobservance of the personnel requirements!

Unauthorized modifications of the automatic backflush filter F450!

Inadequately monitoring of components, which are subject to a wear!

Inappropriately carried out repairs!

Catastrophes through external action and force majeure!
The complete guarantee only and exclusive is taken over for spare parts from
Georg Schünemann GmbH for the automatic backflush filter F450!
No modifications must be carried out at the automatic backflush filter F450
without obtaining the relevant permission from Georg Schünemann GmbH!
For all reconstructions a written permission from Georg Schünemann GmbH is
necessary!
Only use (excluding) original spare and wearing parts of the Georg Schüne-
mann GmbH!
With bought-in spare parts it is not ensured that they were safety fairly designed
and manufactured!

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-1
1 Safety
Important instruction!
At proper operational the reliability of operation of the automatic backflush filter
F450 is ensured. The filter is manufactured according to the safety and industrial
safety regulations. During abuse dangers for lives and health of persons and real
values of the user is threaten.
All persons, who are involved with start-up, operation and maintenance of the fil-
ter, must be accordingly qualified and trained.
The following safety instructions are to be respected in addition of already valid
national rules for accident prevention and laws.
Existing rules for accident prevention and laws must be kept in each case.
1.1 Symbols
The following symbols are used in this manual:
Use for hazardous situations with high probability of death or severe injury. Do
not use for property damage unless personal injury risk present.
Use for hazardous situations which have some probability of death or severe
injury. Do not use for property damage unless personal injury risk is present.
Use for hazardous situations, which may result in minor or moderate injury. Do
not use when there is a possibility of death or severe injury.
Use for indicating a statement of company policy as the message relates direct-
ly or indirectly to the safety of personnel or protection of property.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-2
1.2 Basic safety instructions
Danger through pressure
Before maintenance and repair work you have to make sure at any rate that the
vessel is unpressurized prior to starting any maintenance work at the automatic
backflush filter F450.
Danger through high voltage
Prior to any maintenance and repair work, the filter has to be de-energized and
safeguarded against unintentional reenergizing. The zero potential is to be de-
termined. Neighbouring energized parts are to be covered or provided with
gates.
Possible endangerment
Measures for avoidance
Function failure by wrong handling and/or
assembly
Explanation:
If incorrect or not expressly described parts at
the filter are installed and/or changed, the func-
tion of the filter can be set out of strength or
disturbed substantially.
Possibility to injuries of the serving and mainte-
nance staff during the operation and mainte-
nance.



Only parts may be inserted, attached or
changed, which are listed in the manual and
the pertinent documents.
In case of doubt, information is to be ob-
tained by the manufacturer.
Use only prescribed and perfect tools for the
repair.
Function failure by wrong handling and/or
assembly
Explanation:
If the diameter of the inlet and/or expiration line
does not correspond to the defaults of the
manufacturer of the filter, the function of the
filter can be set out of strength or disturbed
substantially.

Guarantee that the drain lines have the di-
ameter demanded by the manufacturer.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-3
Possible endangerment
Possible endangerment
Measures for avoidance
Function failure by wrong handling and/or
assembly
Explanation:
If the automatic backflush filter F450 will not be
maintained in certain intervals, the function of
the automatic backflush filter can be set out of
strength or disturbed substantially.

Examine the filter regularly according to
chapter 6 „Maintenance“.
Function failure by wrong handling and/or
assembly
Explanation:
Each filter F450 is built for a certain pressure
range, a certain temperature range and a cer-
tain medium. If the filter is built into another
system, as being planned than, the function of
the filter can be set out of strength or disturbed.

Install the automatic backflush filter F450
exclusively into systems for those the filter is
designed and certified.
Burn hazard!
Burn of fingers and/or hands
Explanation:
If the filter F450 is operated in a system, as the
medium reaches a temperature of more than
122 °F (50 °C), burn danger exists alone by
contact of the filter surface.


Isolate all parts of the system, at those a
burn danger exists or
Install danger signs
Burn hazard!
Explanation:
If the filter is subjected unintentionally during
maintenance with pressure, depending upon
kind of the medium injuries such as burn, scald,
caustic or radioactive contamination are possi-
ble.

Before starting maintenance and repair work
make sure at any rate that the vessel is un-
pressurized during any maintenance work.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-4
Possible endangerment
Possible endangerment
Measures for avoidance
Crush hazard
Crush injuries of the fingers, hands and/or feet
Explanation:
The automatic backflush filter F450 has a min-
imum weight of 37.5 lbs (17 kg), depending up-
on model. During transport, the assembly, dis-
assembly and maintenance work crush injuries
of the fingers, hands and/or the feet are possi-
ble.









Keep sufficient safety clearances.
During transport, assembly and maintenance
work wear safety clothing.
Secure the filter during transport, assembly,
disassembly and maintenance work against
slipping and falling down.
Do not grip between the connection flanges
during transport, assembly in the pipes and
disassembly.
Hazardous voltage
Explanation:
Hazardous voltages of more than 48 V are pre-
sent in the control unit. Danger exists by con-
tact of voltage carrying parts.











Prior to any maintenance and repair work,
the filter must be de-energized and safe-
guarded through prohibition signs against
unintentional reenergizing. Additional fuses
for all poles have to be unscrewed and kept
surely or switched off.
After the repair no metallic parts may remain
in the device, which can lead to short cir-
cuits.
Make sure that the filter is grounded.
Danger through parts falling down
Explanation:
Through loose parts, which could fall down inju-
ries are possible.




Basically disassembled parts must not be
laid on the filter. They have to be preserved
securely and allocatable at a dedicated
place.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-5
1.3 Accident prevention rules
1.3.1 General
After assembly (new installation or assembly after transport) and before initial
operation of the filter a safety check must be carried out. All machine parts are to
be examined for their perfect condition.
Check the filter for operational safety before setting into operation (see chapter
4.4 „Steps for setting into operation“)!
The following safety instructions are to be respected in addition of already valid
national rules for the prevention of accidents and laws!
Pay attention to the instructions in this manual and the generally valid, local safe-
ty regulations and rules for accident prevention!
Attached warning and signs give important notes for safety operation. Pay atten-
tion to the warnings.
The staffs carry the responsibility for their own security and the security of third in
the work area. This responsibility cannot be delegated!
Any malfunction possibly impairing the safety must be cleared immediately!
Defective components have to be replaced immediately!
1.3.2 Assembly and disassembly
During assembly/disassembly only the staff, necessary for it, may stay in the
work area of the filter.
Pay attention to sufficient free space of motion and stability of the ground.
Check that after the assembly all components were duly added (control for tight-
ness).
Check that all cables and connecting lines are attached to the points planned for
it!
Before initial operation of the automatic backflush filter F450 the operating per-
sonnel have to convince itself of the faultless state by prescribed controls.
1.3.3 Transport/Location
Absolutely consider the transportation and attitude information.
Before the transport of the filter the components are to be packed in an appropri-
ate and careful way.
Check and fasten the transport locks!

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-6
1.3.4 Electrical system
Any work in connection with the electrical equipment of the automatic backflush
filter F450 must be carried out by a skilled electrician! Circuit diagrams are to be
used as a basis for these jobs.
At all electric operations on the automatic backflush filter and before opening
the control unit, the power supply for the filter is to be switched off or discon-
nected!
Danger of Hazardous Voltage!
Mark the main switch by a warning „ Do not Operate - Electricians at Work “and
safeguard the main switch against unintentional reenergizing!
Mark disconnected current feeds by a warning „Do not Operate - Electricians at
Work“ and ensure, that unauthorized persons can not enter the work area!
Check the electrical equipment of the automatic backflush filter F450 regularly.
Repair slack connections as well as damaged cables immediately!
Never separate connectors or plug together under load! Burn hazard!
Protect connections permanently against humidity.
Keep the control unit permanently closed. Thus the protection from humidity and
contamination is guaranteed.
1.3.5 Compressed air system
Check regularly the air supply lines and the air pressure connections of the air
supply unit for correct attachment and leakages.
Replace damaged or strongly worn components of the compressed air unit im-
mediately.
All work on the compressed air unit of the automatic backflush filter F450 is to be
carried out in the operating stop only. For this the compressed air unit is to be set
out of operation and into pressure-free condition. The compressed air unit is
safeguarded against unintentional repressuring and marked by a sign „Work on
compressed air unit“. Additionally also the electrical system is to be set out of op-
eration and safeguarded against resetting.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-7
1.3.6 Safety at setting out of operation
Take care that the automatic backflush filter F450 is safeguarded against unau-
thorized reenergizing after setting out of operation. Mark the power switch in the
control unit by a warning „Out of order“ and secure the power switch against un-
authorized restarting with a suitable locking device.
Also the compressed air unit is safeguarded against unauthorized setting into
operation and marked by a warning „Out of order“!
1.3.7 Maintenance and repair
Before beginning of maintenance and repair work the automatic backflush filter
F450 is to be set out of operation.
Proceed as described in
Chapter 1.3.4 „Electrical system“
Chapter 1.3.5 „Compressed air system“,
Chapter 1.3.6 „Safety at setting out of operation“
Prior to any maintenance and repair work, the filter has to be de-energized and
safeguarded against unintentional reenergizing!
It is to be paid attention absolutely, that the filter is unpressurized prior to start-
ing any maintenance!
At each maintenance the cable connections have to be checked for fixed fit and
to be fixed professionally if necessary.
Grease and solvents as well as contaminated cloths are appropriately to dispose
of!
An appropriate disposal of the exchanged components has to take place in ac-
cordance with the operational plan for waste disposal!

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 1-8
1.4 Operation
If malfunctions are determined during the operation of the automatic backflush
filter F450, then the filter should be shut down immediately!
Proceed as described in
Chapter 1.3.4 „Electrical system“
Chapter 1.3.5 „Compressed air system“,
Chapter 1.3.6 „Safety at setting out of operation“
Determined malfunction are to be eliminated immediately.
The work may be carried out only by trained and instructed personnel.
The Georg Schünemann GmbH is to be informed, if serious malfunction occur,
which are not to be repaired with own staff.
Malfunction can announce themselves by changed noises of the filter (screech,
clatter, vibrations). If noises change the cause is to be followed immediately.
The determined malfunction may be repaired only with switched off automatic
backflush filter F450!
The automatic backflush filter F450 may be set into operation again only after cut
out the malfunction.
A safety check and a functional test are to be carried out.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 2-1
2 Description
2.1 General description
The automatic backflush filter F450 is a versatile applicable, self-cleaning, as far
as possible maintenance-free filter to remove individual contamination of high
loaded liquids (200 mg/l) from natural sources of water (e.g. seawater, river wa-
ter), warming and/or cooling circuits and processes. The filter works already at an
operating pressure of only 8.7 psi (0.6 kg/cm2g) and features by a small pressure
loss at high flow rate, simple, durable design, high efficiency, weight and space-
saving design.
2.2 Technical description
The contaminated medium flows by the flange marked as inlet into the filter. It
moves through the filter insert from the inside to outside and steps cleaned out
from the flange marked as outlet. The flushing phase of the filter is activated ei-
ther by reaching at the differential adjusted on the pressure differential pressure
switch or after a pre-set interval of time. The flushing valve opens and a greater
amounts of soiling flushes out with the continuously flowing medium. Afterwards
the piston makes two strokes with the flushing disc in the filter insert, thus pro-
ducing an increase in speed between the flushing disc and the filter wall. The lo-
cal loss of pressure produced a ”suction effect” in the filter element. By means of
this pressure drop the coarser and easily cleanable particles are flushed out of
the insert liner through the opened flushing valve out of the filter.
The automatic backflush filter F450 is equipped with an electronic control system,
which monitors all functions and enables adjustment of operating parameters. It
starts automatically the flushing procedure, before possible consolidated deposit
the filter insert can lead to substantial flow reductions.
The flow of filtrate is not interrupted thereby. According to the operating condi-
tions the flushing time can be set over the control system. The flushing frequency
depends on the contamination of the medium.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 2-2
2.2.1 Description of the operational functions
The operation of the automatic backflush filter F450 is divided into the normal
operation and the flushing phases:
Normal operation
The filter is in the normal filtration phase. The
flushing valve is closed and the piston
mounted in the cover is in its initial position
with the flushing disc outside of the filter bas-
ket. The particles are deposited in the filter
insert in accordance with the laws of fluid me-
chanics, starting at the top and continuing
towards the bottom. The running time of this
filtration phase is dependent upon the level of
contamination of the medium.
Because of the design and the fluidic condi-
tions no particles are deposited in the bottom
area of the strainer in this phase.
Filtration and first flushing phase
In this flushing phase the flushing valve
opens and generates a pressure drop relative
to the system pressure prevailing in the pipe
work system. By means of this pressure drop
the coarser and easily cleanable particles are
flushed out of the strainer insert. The filtration
continues throughout this process, while the
flushing flow rate is defined and limited by an
orifice that is located in the flushing outlet
pipe.
The flushing process is triggered either by
monitoring of the differential pressure, or by a
time-based control algorithm resp. it will be
activated by external or by interface.

Automatic Backflush Filter F450
State: 05.02.2016 –1.3 Georg Schünemann GmbH, Bremen 2-3
Filtration and second flushing phase
The flushing valve is open. The pneumatic
driven piston, together with the flushing disc,
moves into the strainer insert up to a 2/3
depth. The large local increase in velocity in
the gap between the flushing disc and the
strainer insert generates a drop in static
pressure (the Bernoulli effect). Only the part
of the region to the flushing disc is the exter-
nal pressure on the clean side of the filter
higher than in the region between the flush-
ing disc and the filter insert. This generates a
“suction” of the dirt particles from the filter
element.
By means of the flushing valve that is open
at the same time, and the pressure drop
thereby generated, the contamination is
flushed out of the filter.
Filtration and last flushing phase
While the flushing disc is reaching its initial
position the flushing valve remains open.
This enables the remaining particles to leave
the filter unit. During the upwards movement
of the flushing disc the lower 1/3-region of
the filter insert is also cleaned by means of a
self-cleaning effect produced by the flow
conditions generated in accordance of the
Bernoulli.