Grunbeck MRA25 User manual

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Backwash filter | MRA25 –MRA100
Operation manual

General Contact
Germany
International Sales
Phone [phone]
Service
Phone [phone]
[email protected]
Availability
Monday to Thursday
7:00 am - 6:00 pm
Friday
7:00 am - 4:00 pm
We reserve the right to technical modifications.
© by Grünbeck Wasseraufbereitung GmbH
Original operation manual
Edition: July 2023
Order no.: 100232920000_en_004

Table of contents
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Table of contents
Table of contents................................................................ 3
1Introduction ............................................................... 4
1.1 Validity of the manual ................................................ 4
1.2 Product identification ................................................. 4
1.3 Symbols used ............................................................ 6
1.4 Depiction of warnings ................................................ 6
1.5 Demands on personnel.............................................. 7
2Safety ......................................................................... 9
2.1 Safety measures........................................................ 9
2.2 Product-specific safety instructions ......................... 11
2.3 Conduct in emergencies .......................................... 12
3Product description ................................................ 13
3.1 Intended use ............................................................ 13
3.2 Product components................................................ 13
3.3 Functional description.............................................. 16
3.4 Accessories ............................................................. 20
4Transport and storage............................................ 22
4.1 Shipping/Delivery/Packaging ................................... 22
4.2 Transport to/at the installation site........................... 22
4.3 Storage .................................................................... 22
5Installation ............................................................... 23
5.1 Requirements for the installation site....................... 26
5.2 Checking the scope of supply.................................. 27
5.3 Water installation ..................................................... 28
5.4 Electrical installation ................................................ 36
6Start-up/commissioning......................................... 48
6.1 Putting the product into operation ............................ 48
6.2 Checking the product............................................... 51
6.3 Setting the month indicator ...................................... 52
6.4 Handing over the product to the
owner/operator/operating company ......................... 52
7Operation ................................................................. 53
7.1 Operating concept ................................................... 53
7.2 Control panel ........................................................... 54
7.3 Display ..................................................................... 55
7.4 Making settings.........................................................57
7.5 Modbus RTU ............................................................60
7.6 Reading the water pressure .....................................63
7.7 Starting a manual backwash ....................................64
8Maintenance and repair...........................................65
8.1 Cleaning ...................................................................65
8.2 Intervals ....................................................................66
8.3 Inspection .................................................................67
8.4 Maintenance .............................................................69
8.5 Spare parts ...............................................................76
8.6 Wearing parts ...........................................................76
9Troubleshooting.......................................................77
9.1 Messages .................................................................77
9.2 Observations ............................................................79
9.3 Manually closing the filter’s suction nozzle ...............80
10 Decommissioning....................................................83
10.1 Temporary standstill .................................................83
10.2 Restart/recommissioning ..........................................83
11 Dismantling and disposal .......................................84
11.1 Dismantling...............................................................84
11.2 Disposal....................................................................84
12 Technical specifications .........................................89
12.1 Backwash filters MRA25/MRA32..............................89
12.2 Pressure loss curves of MRA25 (1") and MRA32
(1¼") .........................................................................91
12.3 Backwash filters MRA40/MRA50..............................92
12.4 Pressure loss curves of MRA40 (1½") and MRA50
(2")............................................................................94
12.5 Backwash filters MRA65/MRA80/MRA100...............95
12.6 Pressure loss curves MRA65/MRA80/MRA100 .......97
12.7 Accessories ..............................................................98
13 Operation log..........................................................100
13.1 Start-up/commissioning log ....................................100
13.2 Maintenance ...........................................................101

Introduction
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1 Introduction
This manual is intended for owners/operators/operating companies, users as well as quali-
fied specialists and ensures the safe and efficient handling of the product. The manual is an
integral part of the product.
●Carefully read this manual and the included manuals on the components before
you operate your product.
●Obey all safety and handling instructions.
●Keep this manual and all other applicable documents, so that they are available
when needed.
Illustrations in this manual are for basic understanding and can differ from the actual design.
1.1 Validity of the manual
This manual applies to the products below:
●Backwash filter MRA25
●Backwash filter MRA32
●Backwash filter MRA40
●Backwash filter MRA50
●Backwash filter MRA65
●Backwash filter MRA80
●Backwash filter MRA100
●Special designs that essentially correspond to the standard products given above.
For information on changes, please refer to the respective information sheet that is
enclosed, if applicable.
Version of control unit MRA-v.1.000
1.2 Product identification
You can identify your product based on the product designation and the order no. indicated
on the type plate.
►Check whether the products given in chapter 1.1 correspond to your product.

Introduction
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The type plate is located on the front and the rear of the filter housing.
Designation
1
Obey the operation manual
2
Date of manufacture
3
CE mark
4
Disposal information
5
Max./min. pore size
6
Rated voltage range
7
Rated frequency
8
Rated input
9
Protection class
10
Maximum water temperature
Designation
11
Water temperature in the drinking water sector
12
Nominal pressure
13
Nominal flow
14
Nominal connection diameter
15
QR code
16
Product designation
17
Data matrix code
18
Order no.
19
Serial no.

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1.3 Symbols used
Symbol
Meaning
Danger and risk
Important information or requirement
Useful information or tip
Written documentation required
Reference to further documents
Work that must be carried out by qualified specialists only
Work that must be carried out by qualified electricians only
Work that must be carried out by technical service personnel only
1.4 Depiction of warnings
This manual contains information and instructions that you must obey for your personal
safety. The information and instructions are highlighted by a warning symbol and are struc-
tured as shown below:
1.4.1.1
1.4.1.2 SIGNAL WORD
1.4.1.3 Type and source of hazard
1.4.1.4
●Possible consequences
►Preventive measures
The signal words below are defined subject to the degree of danger and might be used in the
present document:
Warning symbol and
signal word
Consequences if the information/instructions are ignored
DANGER
Personal
injury
Death or serious injuries
WARNING
Possible death or serious injuries
CAUTION
Possible moderate or minor injuries
NOTE
Damage to
property
Possible damage to components, the product and/or its functions
or an object in its vicinity

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1.5 Demands on personnel
During the individual life cycle phases of the product, different people carry out work on the
product. The respective tasks require different skills.
1.5.1 Qualification of personnel
Personnel
Requirements
User
•No special expertise required
•Knowledge of the tasks assigned
•Knowledge of possible dangers in case of incorrect behaviour
•Knowledge of necessary protective equipment and protective measures
•Knowledge of residual risks
Owner/operator/operating
company
•Product-specific expertise
•Knowledge of statutory regulations on work safety and accident prevention
Qualified specialist
•Electrical engineering
•Sanitary engineering
(HVAC and plumbing)
•Transport
•Professional training
•Knowledge of relevant standards and regulations
•Knowledge of detection and prevention of potential hazards
•Knowledge of statutory regulations on accident prevention
Technical service
(Grünbeck's technical service/
authorised service company)
•Extended product-specific expertise
•Trained by Grünbeck
1.5.2 Authorisations of personnel
The table below describes which tasks may be carried out by whom.
User
Owner/
operator/
operating
company
Qualified
specialist
Technical
service
Transport and storage
x
X
X
Installation and mounting
X
X
Start-up/commissioning
X
X
Operation and handling
X
X
X
X
Cleaning
X
X
X
X
Inspection
X
X
X
X
Maintenance
semi-annually
X
X
X
X
annually
X
X
Troubleshooting
X
X
X
Repair
X
X
Decommissioning and
restart/recommissioning
X
X
Dismantling and disposal
X
X

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1.5.3 Personal protective equipment
►As an owner/operator/operating company, make sure that the required personal
protective equipment is available.
The components below fall under the heading of personal protective equipment (PPE):
Protective gloves
Protective footwear

Safety
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2 Safety
2.1 Safety measures
●Only operate your product if all components are installed properly.
●Obey the local regulations on drinking water protection, accident prevention and
occupational safety.
●Do not make any changes, alterations or extensions on your product. Only use
genuine spare parts for maintenance or repair.
●Keep the premises locked against unauthorised access to protect imperilled or un-
trained persons from residual risks.
●Comply with the maintenance intervals (refer to chapter 8.2). Failure to comply can
result in the microbiological contamination of your drinking water system.
●Be aware of a possible risk of slipping due to leaking water on the floor.
2.1.1 Mechanical hazards
●You must never remove, bridge, or otherwise tamper with safety equipment.
●For all work on the product that cannot be carried out from the ground, use stable,
safe and self-standing access aids (e.g. stepladders).
●Make sure that the product is properly secured, and that the stability of the product
is always guaranteed.
●Potential risk of pinching and cuts on threaded connections. Use protective gloves
when connecting the product and during maintenance work.
2.1.2 Pressure-related hazards
●Components can be under pressure. There is a risk of injuries and damage to
property due to escaping water and unexpected movement of components. Check
the pressure lines and the product for leaks at regular intervals.
●Before starting any repair and maintenance work, make sure that all affected com-
ponents are depressurised.

Safety
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2.1.3 Electrical hazards
There is an immediate danger of fatal injury from electric shock when touching live parts.
Damage to the insulation or individual components can be lethal.
●Only have a qualified electrician carry out electrical work on the system.
●In case of damage to live components, switch off the voltage supply immediately
and arrange for repair.
●Switch off the voltage supply before working on electrical components.
●Never bridge electrical fuses. Do not disable fuses. Use the correct current ratings
when replacing fuses.
●Keep moisture away from live parts. Moisture can cause short-circuits.
2.1.4 Groups of persons requiring protection
●Children should be supervised to make sure that they do not play with the product.
●This product must not be used by persons (including children) with limited abilities,
lack of experience or knowledge. Unless they are supervised, have been instructed
on the safe use of the product and understand the resulting hazards.
●Cleaning and maintenance must not be carried out by children.

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2.2 Product-specific safety instructions
SELV (Safety Extra Low Voltage): Protection by means of safety extra low voltage
The product is only and exclusively designed for operation and use with SELV. By using the
power supply unit supplied with the system, this requirement is fulfilled.
Do not modify the product as this can affect compliance with safety standards and result in
serious injury or damage to property.
●All connected devices and signal interfaces or lines must be suitable for opera-
tion with SELV.
►Consult a qualified electrician or Grünbeck if you are unsure whether your power
supply is a SELV source.
WARNING
Excessive contamination of the filter element
●Health risk due to contamination of the drinking water.
►Comply with the intervals and recommendations for inspection and maintenance
of the filter.
When using the product in hot water filtration, e.g. for heating water:
WARNING
Hot water and hot surfaces
●Burns due to hot surfaces of components at temperatures of more than 55 °C.
●Scalding due to escaping hot water, e.g. during backwash.
►For hot water filtration, install a fixed waste water pipe on the flushing water con-
nection of the filter.
►Use suitable protective gloves when working on the product.
Labels on the product
Hot surfaces/medium
In case of hot water filtration make sure that the product is labelled for risk of hot water.
The affixed information and pictograms must be clearly legible.
They must not be removed, soiled or painted over.
►Obey all warnings and safety instructions.
►Immediately replace illegible or damaged symbols and pictograms.

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2.3 Conduct in emergencies
2.3.1 In case of water leaks
1. Close the shut-off valves for the water flow upstream and downstream of the
product.
2. De-energise the product.
a Unplug the power supply unit from the socket.
3. Locate the leak.
4. Eliminate the cause of the water leak.
2.3.2 In case of control failure
1. De-energise the product.
a Unplug the power supply unit from the socket.
2. Contact technical service.

Product description
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3 Product description
3.1 Intended use
●The MRA backwash filters are designed for the filtration of drinking and industrial
water.
●The filters are suitable for the filtration of process, boiler feed, cooling and air con-
ditioning water (only in partial flow).
●The filters protect the water pipes and connected water-carrying system parts from
malfunctions and corrosion damage due to undissolved impurities (particles) such
as rust particles, sand, etc.
●The filters are designed according to the stipulations of DIN EN 13443-1 as well as
DIN 19628 and are intended for installation into drinking water system according to
DIN EN 806-2 (installation immediately downstream of the water meter).
3.1.1 Application limits
●Water temperature ≤ 90 °C
●Water temperature ≤ 30 °C when used in the drinking water sector (DVGW)
●Pressure range ≤ 16 bar
●Pressure range ≤ 10 bar in case of a media temperature of 90 °C
3.1.2 Foreseeable misuse
The filters must not be used in the areas below:
●in the negative pressure range
●for circulation water treated with chemicals
●for media such as oils, greases, solvents, soaps and other lubricating media, nor
for the separation of water-soluble substances
●for installation into vertical water pipes
3.2 Product components
The product components are valid for the following versions of the MRA backwash filters:
●with screw connections: 1" (DN 25), 1¼" (DN 32), 1½" (DN 40), 2" (DN 50)
●with flange connections: DN 65, DN 80, DN 100

Product description
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Version with screw connections 1" (DN 25), 1¼" (DN 32), 1½" (DN 40), 2" (DN 50)
Designation
1
Universal adapter (type C), Euro plug
Taiwan adapter (type A/B), optional
2
Power supply unit
3
Control unit with display
4
Water meter screw connection
5
Seal
6
Filter housing
7
Inlet pressure gauge
8
Outlet pressure gauge
Designation
9
Brush
10
Sieve bottom
11
Suction nozzle (valve)
12
Filter element
13
O-ring of filter element
14
O-ring of filter funnel
15
Filter funnel
16
Flushing water connection with free outlet
17
Locknut

Product description
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Version with flange connections DN 65, DN 80, DN 100
Designation
18
Blind plug
19
Flange connection acc. to DIN EN 1092-1
20
Holes for cable gland M12/M20
(external signal line)
Designation
21
Connections for pressure sensors
22
Connection for safety solenoid valve
23
Connection cable of power supply unit,
2 m in length

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3.3 Functional description
The unfiltered raw water flows into the filter from the inlet side and from the inside out
through the filter element and to the pure water outlet. Thus, foreign particles of a size
> 100 µm are retained.
Depending on their size and weight, foreign particles stick to the filter element, or they fall
straight down into the filter funnel.
Due to the growing contamination of the filter element, the differential pressure between the
raw water inlet and the pure water outlet increases.
The differential pressure can be read at the pressure gauges, or on the display of the control
unit by way of the pressure sensors available as an option.
The backwash process is activated by the integrated control unit and carried out by the drive
unit on the filter head. The lower suction nozzle (valve) is lifted, and the drain outlet is open.
During the turning motion, the brush turns as well and sweeps over the filter surface of the
filter element. The filter element is cleaned. The impurities are removed by the brush and the
suction nozzle sucks them into the drain outlet.
A manual backwash can be started at any time via the control unit.

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3.3.1 Backwash via control unit
Designation
1
Outlet pressure sensor (optional)
2
Inlet pressure sensor (optional)
3
Safety solenoid valve (optional)
4
Nozzle screw
Designation
5
Microswitch
6
Drive unit
7
Cam disc

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Backwash process
The control unit releases backwash processes by way of set time intervals and monitors the
number of backwash processes. The backwash lock can be activated by means of a lock
time.
When optional pressure sensors are used, the control unit can also start a backwash via the
adjustable differential pressure (preset to 0.4 bar).
The backwash process can be controlled via external inputs.
Backwash process
Start
Lock
Time intervals
1 h … 180 d
Time from ... to
Differential pressure (optional)
0.2 … 3.0 bar
Time from ... to
External inputs/bus interface
Backwash release
Backwash lock
For signal forwarding and remote monitoring, the control unit features the connection options
below:
●Bus interface (Modbus RTU)
●Fault signal contact
●Programmable input
Sequence of a backwash process
●The drive unit gradually opens the valve (suction nozzle) within 40 seconds.
●The filter is flushed for 10 seconds.
●The drive unit gradually closes the valve (suction nozzle) within 40 seconds.
If opening and closing the valves is blocked by dirt or wear and tear of the components, the
control unit recognises this and reacts automatically.
If the control unit cannot resolve the issue automatically, a corresponding error message is
displayed (refer to chapter 9).
In the event of a power failure during an ongoing backwash process, the backwash will not
be terminated automatically. The water continues to be flushed out until the backwash pro-
cess is terminated manually.
An optional safety solenoid valve closes the drain outlet in the event of a power failure and
prevents further water discharge (refer to chapter 5.4.6).

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3.3.2 Parallel operation of two filters
Parallel piping
Parallel piping for various sizes and materials (refer to chapter Accessories 3.4).

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3.4 Accessories
You can retrofit your product with accessories. Please contact your local Grünbeck repre-
sentative or Grünbeck’s headquarters in Hoechstaedt/Germany for details.
Take into consideration that the availability of accessories can differ from country to
country.
As per DIN EN 13433-1, filter elements with pore sizes of 50 μm, 200 μm and 500 μm are
not permitted for drinking water systems and might only be used after consultation with
Grünbeck.
Designation
Order no.
1" / 1¼"
1½" / 2" / DN 65
DN 80 / DN 100
50 µm filter element
107 052
107 053
107 054
200 µm filter element
107 072
107 073
107 074
500 µm filter element
107 082
107 083
107 084
Illustration
Product
Order no.
Drain connection DN 50
188 875
For professional installation according to DIN EN 1717 with integrated si-
phon to discharge the backwash water to the drain.
Adapter kit
As spacer flange, to ensure the function of the butterfly valves directly
mounted on the filter.
Scope of supply:
2 flanges, 4 seals, 16 screws M16x120 mm with washers and nuts
For DN 80 with flange connection
106 804e
for DN 100 with flange connection
106 805e
Parallel piping
For connection in parallel (cascade) of 2 filters,
with pre-assembly of parallel piping (without filter)
Brass version
DN 40
Filter connection 1"
552 005
DN 50
Filter connection 1¼"
552 010
DN 50
Filter connection 1½"
552 015
DN 80
Filter connection 2"
552 020