BWT bestaqua 6 Manual

Einbau- und Bedienungsanleitung DE
Fitting and operating instructions EN
Notice de montage et d’utilisation FR
Istruzioni di montaggio e per l‘uso IT
BWT bestaqua 6
BWT bestaqua 12
BWT bestaqua 18

EN
26
Table of contents EN
Chapter 1: Introduction & safety................................................................................................................. 27
1.1 Abbreviations and subject index.................................................................................................... 27
1.2 Scope of delivery ........................................................................................................................ 28
1.3 Manufacturer .............................................................................................................................. 28
1.4 General comments....................................................................................................................... 28
1.4.1 Reading of the manual (IOM)................................................................................................ 28
1.4.2 Warranty provisions and disclaimer....................................................................................... 29
1.4.3 Obligations of the operator................................................................................................... 29
1.4.4 Licence conditions ............................................................................................................... 29
1.4.5 Explanation of listed symbols ................................................................................................ 29
1.5. Operation and safety precaution advices....................................................................................... 29
1.5.1 Intended use of device ......................................................................................................... 29
1.5.2 Permitted mode of operation ................................................................................................. 29
1.5.3 Prohibited mode of operation................................................................................................ 30
1.5.4 Qualified persons and users.................................................................................................. 30
1.5.5 Shutdown periods................................................................................................................ 30
1.6 Function of the RO unit................................................................................................................. 30
1.7 Preconditions for the installation .................................................................................................... 31
1.7.1 Positioning of the RO/installation requirements........................................................................ 31
1.7.2 Feed water requirements ...................................................................................................... 31
1.7.3 Setting the correct operating pressure..................................................................................... 31
Chapter 2: Assembly and installation.......................................................................................................... 31
2.1 Preparation for assembly.............................................................................................................. 31
Chapter 3: Operation and programming of the software............................................................................. 33
3.1 Quick operation guide ................................................................................................................. 33
3.2 Function keys and display elements................................................................................................ 33
3.3 Switching the device ON and OFF ................................................................................................ 34
3.4 Menu display of the activated system ............................................................................................. 34
3.5 Option: External I/O installation kit ............................................................................................... 35
3.6 System settings/visualisation ......................................................................................................... 36
3.7 Main menus................................................................................................................................36
3.7.1 Menu: SETUP (Basic settings, System settings).......................................................................... 36
3.7.2 Menu: SERVICE (Maintenance).............................................................................................. 39
3.7.3 Menu: AUTO RINSE (Automatic rinsing) ................................................................................. 41
Chapter 4: Fault finding ............................................................................................................................. 42
4.1 Overview of the Status/Alarm LED.............................................................................................. 42
4.2 Trouble shooting guide............................................................................................................... 42
Chapter 5: Maintenance and service........................................................................................................... 45
5.1 Maintenance and wearing parts.................................................................................................... 45
5.2 Cleaning.................................................................................................................................... 45
5.3 Installation of the WCF kits ........................................................................................................... 45
5.4 Replacement of membrane element................................................................................................ 45
5.5 Disposal..................................................................................................................................... 45

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27
Table of contents EN
Chapter 6: Technical data........................................................................................................................... 46
6.1 Technical data BWT bestaqua 6,12,18 .......................................................................................... 46
Chapter 7: Documentation.......................................................................................................................... 47
7.1 Form for set values of BWT bestaqua 6,12,18 ................................................................................ 47
EC declaration of conformity....................................................................................................................... 95
Notes........................................................................................................................................................ 98
1.1 Abbreviations and subject index
Softening:
The water purification process removes the hardness from raw
water. Hardness constituents are the portion of calcium and
magnesium ions in the water.
Raw water:
Raw water (usually untreated drinking water) must often be pre-
treated (usually softening) and is then useable for the desalination
process in the RO device.
RO:
Abbreviation for Reverse Osmosis.
Permeate:
The largely desalinated “pure water“ filtered in the RO mem-
branes and generated by reverse osmosis. The characteristic
value is the electric conductivity in µS/cm.
Concentrate:
Waste water led to outlet. This waste water contains the salts and
minerals that have been removed from the raw water.
Membranes:
The “filter“ of the device which is capable of desalinating the raw
water by high pressure and flow.
SDI:
Abbreviation for “Silt Density Index“. The “Silt Density Index“
is an indicator of the organic contamination of raw water. The
measurement system is a filtration process which determines the
blocking tendency, measured during 15 min.
IOM:
Abbreviation for “Installation and Operating Manual“
Permeate yield (WCF):
The ratio between the produced pure water (permeate) and the
thus required amount of feed water (soft water) is expressed as
permeate yield (WCF) or “Water Conversion Factor“.
Online/offline configuration mode:
The units configuration mode could be set either online (standard
preset) or offline. The offline mode requires the installation of
the Input-/Output- option.
In the online mode the produced permeate is delivered to the
consumer via a pressure reservoir without booster pump.
In the offline mode the produced permeate stored in a permeate
tank and is delivered to the consumer via a booster pump. The
permeate tank is monitored with an level contact (NO).
NO:
Abbreviation for level switch “normaly open“ (for level queries
as ascending normally open contact).

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The scope of delivery of the RO device includes:
Microprocessor controller:
1OLED display (monochrome: blue)
2Function button: ON/OFF and standby
3Function button: Upward
4Function button: Downward
5Function button: Confirmation/OK
6Status/Alarm LED (green: ready, working, flushing, pause
red: service, no feed water, alarm)
Connections and service components:
7Electrical wiring with grounded PE mains plug “CEE7“
8Feed water connection 3/4“ male thread
9Permeate connection 3/8“ male thread
10 Concentrate connection Ø 8mm
11 Service opening for adjusting the pump pressure
Optionally available, Item no. 824047:
12 External contacts (INPUT/OUTPUT), 3-pin, M8
for the communication between RO unit and
the external unit for external start-/stop switching (DI)
and alarm output (DO).
1.3 Manufacturer
The RO devices BWT bestaqua 6,12,18 are
manufactured in the name of:
BWT water + more GmbH
Walter-Simmer-Straße 4
AT-5310 Mondsee
Phone: [phone]
Fax: [phone]
1.4 General comments
Following the instructions in this Installation and Operating
Manual (IOM) helps the operator to run the reverse osmosis
BWT bestaqua 6,12,18 reliably and economically. This Ma-
nual (IOM) is part of the device and must be constantly avai-
lable at the place of operation for all assigned staff members.
1.4.1 Reading of the manual (IOM)
The staff must have read and understood this IOM prior to any
work being carried out. A basic precondition for safe working
is the adherence to all stated safety and operating instructions.
In addition, the local accident prevention provisions and the
general safety provisions effective at the place of operation are
applicable. The illustrations in these instructions serve the basic
understanding and can deviate from the actual design of the
device. Justified claims cannot be derived from the same.
1.2 Scope of delivery
The reverse osmosis unit BWT bestaqua 6,12,18
consists of 3 core components:
s¬-EASURING¬AND¬CONTROL¬UNIT
s¬(IGH¬PRESSURE¬PUMP¬
s¬2/¬UNIT
Fig. 1: BWT bestaqua 6,12,18 - Front view of the device
Fig. 2: BWT bestaqua 6,12,18 - Rear view of the device
1
5
4
32
10
9
8
7
12
11
6

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1.4.2 Warranty provisions and disclaimer
Please observe: All of the information and instructions
contained in this installation and operating manual were
provided in respect of current standards, regulations,
prior art and our long term experiences.
BWT excludes any responsibility for damages and
for consequential loss due to:
s¬.ONCOMPLIANCE¬WITH¬THE¬INSTRUCTIONS¬IN¬THE¬MANUAL
s¬5SE¬NOT¬CONFORMING¬TO¬THE¬INTENDED¬PURPOSE
s¬)MPROPER¬OR¬FAULTY¬INSTALLATION
s¬)MPROPER initial operation and operation, maintenance
s¬5SE¬OF¬NONPERMITTED¬COMPONENTS¬AS¬WELL¬AS¬NONORIGINAL¬PARTS
s¬,ACK¬OF¬EXAMINATION¬IN¬REQUIRED¬SERVICE¬AND¬MAINTENANCE¬
work
s¬$AMAGE¬DUE¬TO¬UNAUTHORIZED¬MODIlCATION¬AND¬TECHNICAL¬
manipulation
1.4.3 Obligations of the operator
s¬4HE¬INSTALLATION¬AND¬OPERATING¬MANUAL¬HAS¬ALWAYS¬TO¬BE¬KEPT¬
close to and accessible at the RO unit.
s¬4HE¬2/¬UNIT¬MUST¬ONLY¬BE¬USED¬IF¬IT¬WORKS¬IN¬A¬TECHNICALLY¬PROPER¬
manner and if the safety status is reliable.
s¬4HE¬INSTRUCTIONS¬NOTICES¬AND¬ADVICES¬OF¬THE¬INSTALLATION¬AND¬
operating manual have to be followed properly.
1.4.4 Licence conditions
The IOM is protected by copyright. Surrendering the manual
to any third party, duplication of any kind and form – also in
excerpts – as well as the utilisation and/or communication of
the content are not permitted without the written consent of the
manufacturer. Infringements obligate to pay compensation for
damages. Further claims are reserved.
Note: Upon the acquisition of the reverse osmosis, the user recei-
ves an exclusive, non-transferrable right of utilisation in respect
of the software installed by the manufacturer.
1.4.5 Explanation of listed symbols
This installation and operating manual uses warnings/symbols!
The warnings/instructions are introduced by signal words to
underline risks.
Please follow instructions and treat them with maximum importance
to avoid any accidents and damages.
Danger: Caused by electric current or voltage!
Always consult a qualified electrician when working
on places denoted by this symbol.
Attention: Dangerous spot!
Details or orders and prohibitions to avoid personal
injury or extensive damage to property.
Please observe: Underlines useful recommendations
and information for an efficient operation free of any
interruptions.
Note: Additional information for the operator.
1.5 Operation and safety precaution advices
The following chapter provides an overview of all important
operation and safety precaution advices to enable safe operation
free of any interruptions. Despite all safety precaution measures,
residual risks still remain, particularly in case of improper use and
handling. A warranty claim will be denied, if the notices and ad-
vices of this installation and operating manual are not respected.
1.5.1 Intended use of device
The device is suitable for the desalination of water in drinking
water quality up to max. 30°C and a raw water pressure of
max. 6.0bar and can be operated either directly in front of the
consumer in an “online“ process or it can be connected “offline“
to an atmospheric tank upstream of the user.
Observe: The feed water quality has to meet the requi-
rements of the technical specifications (see Part 6.1) and
must not be exceeded!
The device shall only be used for its intended purpose, in line with
the installation and operating manual and in the environment to
which it was intended and designed. Deviations are regarded
as “non-intended purpose”.
The intended use also comprises the adherence to the operating,
maintenance and upkeep conditions stipulated by the manufacturer.
Attention: The RO unit must be fed with cold water in
drinking water quality.
s¬Every deviation from the intended purpose, e.g. deionisation of
feed water of non-drinking water quality, can led to irreversible
damages or can cause undesired microbial contamination of
the unit.
1.5.2 Permitted mode of operation
Observe: To protect the drinking water, observe
the country-specific guidelines for drinking water
installations in any work at the RO device.
s¬0RIOR¬TO¬ANY¬MAINTENANCE¬WORK¬AT¬THE¬DRINKING¬WATER¬SUPPLY¬
system, the device must be separated from the water supply
system. Rinse the water pipe sufficiently before reconnecting
the device.
s¬)NTERRUPT¬THE¬VOLTAGE¬SUPPLY¬OF¬THE¬DEVICE¬AND¬OF¬THE¬TERMINAL¬
equipment prior to assembly (unplug mains plug).

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Please observe! Improper and faulty installation of the
RO unit can cause material damages.
s¬0LEASE¬OBSERVE¬ALL¬APPLICABLE¬SPECIlC¬NATIONAL¬GUIDELINES¬AND¬
installation regulations (e.g. DIN 1988, EN 1717), general
hygiene requirements and technical specifications in order to
protect the drinking water.
s¬5NAUTHORIZED¬RECONSTRUCTION¬WORK¬AS¬WELL¬AS¬TECHNICAL¬
modifications are prohibited.
s¬0LEASE¬AVOID¬ANY¬MECHANICAL¬DAMAGES¬OF¬THE¬2/¬UNIT¬
otherwise the warranty will lapse.
s¬0LEASE¬INSTALL¬A¬SHUTOFF¬VALVE¬IN¬FRONT¬OF¬THE¬2/¬DEVICE
s¬0LEASE¬USE¬flexible tubes according DVGW W543
requirements only.
s¬0LEASE¬AVOID¬DIRECT¬HEAT¬SOURCES¬EG¬RADIATORS¬AND¬
exposure to sunlight.
s¬#HEMICALS¬SOLVENTS¬AND¬FUMES¬MUST¬NOT¬COME¬INTO¬CONTACT¬WITH
the RO unit.
s¬4HE¬INSTALLATION¬SITE¬MUST¬BE¬FREE¬OF¬FROST¬AND¬EXPOSURE¬TO¬SUNLIGHT
s¬$O¬NOT¬USE¬FOR¬EXAMPLE¬microbial contaminated feed water
or with feed water of an uncertain quality or origin.
s¬)F¬PERMEATE¬IS¬USED¬FOR¬food preparation, clean and/or flush
downstream users/machines before use.
s¬Avoid unnecessarily long storage times of the equipment, in
order to prevent the risk of microbial contamination.
s¬4HE¬DEMINERALISED¬WATER¬ PERMEATE¬may not be used as
drinking water.
1.5.3 Permitted mode of operation
Attention: DANGER due to use deviating from the
intended purpose!
Any use beyond the intended purpose and/or any
different use of the device can lead to dangerous
situations.
Any claims because of damages resulting from any use
not corresponding to the intended purpose are
excluded.
Please observe:
NEVER operate the device with the housing covers
removed.
The complete power supply unit must be replaced in
the event of damage to the mains cable.
Observe! For the RO units operation a 100µm particle
filter must always be provided by the customer.
Please use:
s¬If needed, use protective clothing.
s¬Do not use any aggressive cleaning agents!
1.5.4 Qualified persons and users
Please observe:
Stipulate clear staff responsibilities for operation,
set-up, maintenance, repair work!
For installation, commissioning and maintenance/service work, it
is mandatory that it be effected by skilled and instructed person.
The user has to be trained by a BWT organisation or other
authorised person to operate the RO device.
s¬Trained and instructed staff: Was instructed about all possible
dangers due to improper use.
s¬Qualified persons: Are able to install, commission and service
an RO unit due to their qualification, knowledge and experience
in current regulations.
1.5.5 Shutdown periods
The BWT bestaqua 6,12,18 unit is equipped with an program-
mable interval flush to prevent microbial contamination during
long non-service periods. Nevertheless, it is recommended to
implement the following measures in case of unfavourable cases.
s¬7E¬RECOMMEND¬discarding the first 30 minutes of permeate after
each long idle periods of non use – e.g. weekends, holidays.
s¬2EMOVE¬THE¬MAINS¬PLUG¬OF¬THE¬DEVICE¬AND¬CLOSE¬THE¬CUTOFF¬VALVE¬
in the inlet of the reverse osmosis in case of longer breaks in
operation.
s¬0LEASE¬CARRY¬OUT¬A¬REPLACEMENT¬OF¬THE¬MEMBRANE¬ELEMENTS¬
especially in unfavourable cases, e.g. longer down times in
warm installation rooms.
s¬0LEASE¬CONSIDER¬THE¬INDIVIDUAL¬MANUAL¬OF¬THE¬EXTERNAL¬PRElLTER
1.6 Function of the RO unit
A semi-permeable RO membrane separates feed water of a high
pressure (8 ... 9 bar) into deionised (permeate) and into waste
water (concentrate) with a high salinity.
The relation between the produced permeate and feed water is
expressed as recovery or WCF (%). Without the installation of a
WCF kit the RO is set by default with a WCF-value of 40%. In
order to achieve higher permeate yields the appropriate WCF kits
(50% or 60%) must be connected to the concentrate outlet and
also the water hardness must be checked with a measurement.
The RO unit can be operated in an “online“ mode (directly con-
nected to the user) or in the “offline“ mode (atmospheric permeate
tank upstream of user). In this case, the reverse osmosis is equip-
ped with the additional I/O option and fill the produced permeate
to an pure water tank which is monitored with an NO-level switch.
The RO unit starts and stops according to the value set of pres-
sure (online mode: 2.0 ... 4.0bar and in the offline mode: stop
pressure firmly preset at 2.0bar).
When the (online/offline) connected consumer demands pure
water, the internal pressure drops below the presetted value of
the “RO start pressure“ and the RO turns into production.

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After the ending of the last pure water demand the permeate
back pressure increases as long as the presetted stop pressure is
reached. As the turn-off pressure is reached, the device assumes
the “Ready” stand-by mode.
If a failure occurs, the display shows the failure code and the
status alarm LED turns into red. If required, the device deactiva-
tes itself automatically. Part 4.2 contains information concerning
possible failure code displays and their causes as well as “trou-
bleshooting“.
1.7 Preconditions for the installation
1.7.1 Positioning of the RO/installation requirements
When installing the device, select a location where the device
can easily be connected to the water supply network.
A connection to the sewage system and a separate mains socket
(230V, 50Hz) must be nearby. Please connect the PE mains plug
only to a grounded socket.
The rated mains power (see technical data) and the requisite
feed water pressure must be present at all times.
If a pump station is needed for draining, please consider
corrosion-resistant materials.
National guidelines and regulations:
Observe all applicable installation regulations, general guidelines,
hygiene requirements, and technical specifications.
Frost protection and ambient temperature:
The installation site must be dry and free of frost and ensure the
protection of the unit against chemicals, paint, solvents and fumes.
If the mains water is treated with oxidising disinfectants (chlorine,
chlorine dioxide, etc.), an activated carbon filter is recommended
to be placed in front of the unit. A 100µm particle filter must
always be provided by the customer.
Further pre-treatment is to be determined by the BWT service
in dependence on the local feed water quality.
Quality of the pipeline supply:
Please observe: Only corrosion-resistant material must
be used in the permeate area.
Electrical interference:
The emission of interference (voltage peaks, high-frequency
electromagnetic fields, interference voltages, voltage fluctuations
...) by surrounding electrical systems may not exceed the
maximum values specified in EN 61000-6-4.
1.7.2 Feed water requirements
The RO unit must only be fed with cold drinking water (maximum
30°C), which meets the official requirements for potable water
and covers the specification in table 6.1.
Data analysis of the feed water in your area:
Every deviation from the intended purpose, e.g. deionisation of
non drinking water feed water can led to irreversible damages too
human and equipment (e.g. undesired microbial contamination
of the RO unit).
Warning: Caused by unsuitable water quality.
UÊ/iÊÌÊÛ>ÕiÃÊÃÌi`ÊÊ*>ÀÌÊÈ°£
must not be exceeded.
s¬!N¬EXCEEDING¬OF¬THE¬LIMITVALUES¬BY¬INCOMPATIBLE¬FEED¬
water might cause danger to unwanted sedimention
on the membranes. That influences negatively quality
and performance.
1.7.3 Setting the correct operating pressure
A minimum operating pressure is required for the optimum
functioning of the unit. Besides, the water pressure should not
exceed the maximum permissible pressure.
Attention: The feed water inlet pressure must be
between 2.0 and 6.0 bar!
Please avoid pressure variations of more than ±0.5bar.
s¬)T¬is recommended to install a ball valve at the inlet side of the
unit, so that the feed water supply may be interrupted for service
purposes.
s¬#USTOMERS¬SHOULD¬INSTALL¬A¬FEED¬WATER¬SUPPLY¬of at least DN10
to avoid unreliable operation. An undersized inlet causes the
danger of an interruption of the operation due to insufficient
water pressure or insufficient flow, e.g. when rinsing the
membranes.
s¬!¬PRESSUREREDUCING¬VALVE¬CAN¬DECREASE¬THE¬mOW¬RATE¬
negatively.
2.1 Preparation for assembly
Unpacking of the RO unit:
Remove the device from its packaging and check the delivery
to see that everything is there and that no damage was caused
during transport.
If the pressure is more than
6.0 bar, install a pressure
reducing valve.
Please do not operate the unit


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Notes for initial operation:
s¬#ONNECT¬THE¬2/¬UNIT¬WITH¬THE¬ELECTRICAL¬POWER¬SUPPLY¬
(230V, 50Hz). The wall socket has to be earthed.
s¬0LEASE¬CONSIDER¬THE¬INDIVIDUAL¬MANUAL¬OF¬THE¬external pre-filter.
s¬4HE¬water hardness can vary in different areas.
s¬Please observe that a too high set water recovery will damage
the units membranes. Finally, the RO units recovery affects the
conductivity of the permeate. Generally, we recommend the
operation with softened feed water to achieve an extending
of the life and reliability of the RO membranes.
All hoses have been connected and are watertight.
s¬0LEASE¬OPEN¬THE¬VALVE¬FOR¬THE¬FEED¬WATER¬SUPPLY
s¬#ONNECT¬THE¬2/¬UNIT¬TO¬THE¬POWER¬SUPPLY¬6¬(Z
The functions of the control unit and software configuration
are described in Part 3.1 - 3.8.
s¬)NSTRUCTIONS¬FOR¬THE¬7#&¬KIT¬INSTALLATION¬AVAILABLE¬IN¬Part 5.3.
s¬Note: Discard the first produced permeate during the first
30 minutes after any new installation/first commissioning.
Note: Please run the RO unit a few days to reach the
full performance (WCF and permeate quality).
Note: A drop of temperature by 1°C will reduce the
permeate output of the membranes by approx. 3.0%.
Possible installation layout:
1BWT bestaqua 6,12,18 reverse osmosis
2External pre-filter (not included in the delivery)
3 Permeate outlet ready for the connection to the consumer/tank
4 Stop valve for feed water (not included in the delivery)
5 Mains plug, cable length 1.8m
6Concentrate outlet
7Optionally: External contacts (INPUT), start/stop
8Optionally: External contacts (OUTPUT), alarm output
Hydraulic installation:
Please respect the general installation instructions for the
preparation of water installations as well as the general
hygiene requirements.
s¬0LEASE¬READOBSERVE¬ALL¬APPLICABLE¬SPECIlCATIONS¬OPERATING¬
and safety instructions prior to the installation.
s¬0LEASE¬USE¬ONLY¬APPROVED¬mEXIBLE¬HOSES¬ACCORDING¬TO¬
the DVGW W 543 requirements.
s¬0LEASE¬ADHERE¬TO¬ALL¬DIMENSIONS¬AS¬WELL¬AS¬BENDING¬RADIUS¬IN¬
the assembly of the flexible tubes and connection sets.
s¬4HE¬"74¬BESTAQUA¬¬DEVICE¬LINE¬IS¬TO¬BE¬INSTALLED¬AND¬
operated vertically.
s¬4HE¬UNIT¬MAY¬NOT¬BE¬CONNECTED¬TO¬THE¬WATER¬MAINS¬BY¬RIGID¬PIPES
s¬!¬HYDROPHORE¬COULD¬BE¬INSTALLED¬IN¬THE¬PERMEATE¬LINE¬BETWEEN¬
the RO unit and the consumer, if depending on the application
a short-term peak flow is required.
Connection to the water pipe:
s¬4HE¬DEVICE¬HOSES¬MUST¬BE¬INSTALLED¬IN¬A¬mEXIBLE¬MANNER¬
(without any tension) to maintain a safe operation.
s¬#HECK¬ALL¬WATER¬CONNECTIONS¬TO¬ENSURE¬THAT¬THEY¬ARE¬TIGHT¬AND¬
waterproof.
s¬'UIDE¬THE¬mEXIBLE¬CONCENTRATE¬HOSE¬WITH “free flow“ condition
to the on-side connection of the drain pipe (with a slope of 1%)
and fasten it. Please take care that the “flexible“ hose do not
have any bends or mechanical reductions. If needed assemble
the suitable WCF installation kit to the concentrate outlet. The
WCF kits are included in the delivery.
Table 1: Selection of WCF-Settings
Selection: Approx. value: Approximate value:
WCF-Set 40 Factory
setting WCF 40% ± 5% applicable if: >14°dH
WCF Set 50 WCF 50% ± 5% applicable if: 7 ... 14°dH
WCF Set 60 WCF 60% ± 5% applicable if: < 7°dH
3
6
1
4
Fig. 3: Installation scheme / example
2

BWT Protector Mini C/R 1/2“ ;
BWT accessories
5
7
8

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3.2 Function keys and display elements
Fig. 4: Display: Activated menu
By pressing the [ON/OFF] button the device switches
from Ready to Pause or ON/OFF.
[] (Arrow up) button Scrolls through the menu
pages upward or increases the value of the
parameter presently shown on the display.
[] (Arrow down) button Scrolls through the menu
pages downward or decreases the value of
the parameter presently shown on the display.
[] Confirmation button Confirmation of the
parameter presently shown on the display and
performs partially a reset in case of alarms
and/or failures.
General status:
ready: “READY“ for a new consumption demand.
In the online mode the unit starts automatically
when the permeate pressure falls below the
presetted starting pressure.
pause: RO unit stops the permeate production.
Observe: The unit doesn‘t start in case of
a new emerging permeate demand.
Only in the mode “PAUSE“ is your RO unit
programmable.
working: RO unit is in production ... “WORKING“.
By pressing the [ON/OFF] button the production
is interrupted and the “PAUSE“ message appears,
by a repeated pressing the production start again.
flush: The RO unit rinses internally ... “flush“ and switches
after that automatically to the operating step “READY“.
Optionally available, Item no. 824047:
“EXT. PAUSE“: The RO unit can be equipped with the additional
I/O installation kit, started and stopped due to the triggering of
an external NO potential free signal.
Status displays:
READY ; PAUSE ;
WORKING
Pressure permeate:
Pump pressure:
Date / Time:
4 Control keys for the menu and
parameter selection [O], [], [], []
3.1 Quick operation guide
The BWT bestaqua 6,12,18 device are controlled and parameterised using the control unit.
The high-resolution OLED display shows the activated operating mode after the starting phase.
READY ; PAUSE ;
device [ON/OFF]

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34
3.3 Switching the device ON and OFF
Switching the device ON:
To activate the device, it has be connected to the power
supply.
The device is activated by pressing the [ON/OFF] button
and starts immediately if an an online permeate demand
is detected (approx.2sec) or an offline request signal
triggered the permeate demand.
Subsequently the autotest mode starts and the device
is routinely checked, rinsed and filled with feed water.
Automatic start sequence of device:
BEST WATER TECHNOLOGY
Logo of the manufacturer
self
test
Internal function check of sensors,
electronics and pump
self
test ok
Rinsing and filling the feed water
into the RO unit
rinsing RO being is pre-rinsed
ready RO system is ready
3.4 Menu display of the activated system
Note: In the operating mode “working/WORKING“ starts
and stops the unit in accordance with the request signal
(min./max. permeate pressure) or the optional remote
ON / OFF. The units display indicates the operating
status “working“:
Press the arrow keys to call up the detailed overview screen.
w o r k i n g
PERM 3.2 bar
PUMP 8.1 bar
WORKING
03- 12 - 13 15 : 58
Fig. 6: Display in operating condition “WORKING“
the stop pressure (signal) has not been reached yet.
Interrupting the production:
Brief pressing of the [ON/OFF] button, the device swit-
ches to “PAUSE“. The device restarts after pressing the
[O] button and is immediately available for operation.
Switching the unit OFF (only possible during operation):
For a complete deactivation of the device please press
the [ON/OFF] button for about 2s.
Switching on again of the unit:
By pressing the [ON / OFF] button for about (2s), the de-
vice starts the automatic start sequence an is immediately
into the production mode (see part 3.3).
Comments on the OLED-display:
Note: The OLED-display switches OFF after about
120s in order to achieve a long operating time.
Just before stand-by switching into the black display
the following text is been shown: “DISPLAY OFF“.
A brief pressing of any key re-activates the display.
PAUSE / “Offline mode“:
In the pause status, the unit is programmable, but doesn‘t switch
into production (no processing of inlet pressure- signals / or optio-
nal remote-controlled ON-OFF signals). The units control display
shows the operating status “pause/PAUSE“.
Press the arrow keys to call up the detailed overview screen.
p a u s e
PERM 3.2 bar
PUMP _ _ _ bar
PAUSE
03- 12 - 13 15 : 58
Fig. 7: Display shows “PAUSE“ and the RO unit
is therefore programmable.

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35
EXT. PAUSE / (remote pause in OPTION):
When the RO unit displays “remote pause/EXT. PAUSE“ the RO
unit is interlocked by the external control. The external remote
controller detects no incoming signal of a permeate demand (of
an NO-level switch). In this case no production can take place and
the operating status “remote pause“ is shown on the RO display.
Press the arrow keys to call up the detailed overview screen.
r e m o t e
p a u s e
PERM 3.2 bar
PUMP _ _ _
EXT. PAUSE
03- 12 - 13 15 : 58
Fig. 9: Display shows “EXT. PAUSE“ and is now part one of an
external unit-control supervised start-stop function.
3.5 Option: External I/O installation kit
The optional “external Input and Output kit“ enables the use of the
potential-free NO contact to activate the remote On-/Off switching
of the RO units installable alarm output. All RO alarms can be
transferred as an common alarm to an external control.
The external I/O kit is either already preinstalled or upgradable
as an additional install option.
External I/O installation KIT Order no.: 824047
READY to start (waiting of the start signal):
With the display of the operating status “ready/READY“ the RO
unit indicates that it is permanently able for operation, but need
a signal of a permeate demand to start the production within the
status “working“. The display shows the operating status „ready“:
Press the arrow keys to call up the detailed overview screen.
r e a d y
PERM 3.2 bar
PUMP _ _ _
READY
03- 12 - 13 15 : 58
Fig. 8: Display shows the status “READY“ and is operational.

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3.6 System settings/visualisation
Note: All of the programable settings described in Part
3.8 can only be accessed and activated in the “PAUSE”
mode.
Visualisation of the menu screens/displays:
Note: The differing representation of the software
diagrams exclusively serves a better overview and is
subsequently described.
In each menu screen the blue light bar highlights the current
active menu item or value set.
AUTO RINSE ACTIVE
SERVICE INACTIVE
STOP DELAY PERMANENTLY DEACTIVATED
SETUP INACTIVE
EXIT
3.7 Main menu
The menu consists of 4 selectable menu items in which the
subsequent settings may be effected:
AUTO RINSE:
s¬-ODE¬FOR¬AUTOMATIC¬mUSHING
SERVICE:
s¬Settings of setpoint- and limit values for service purpose.
SETUP:
s¬General device settings (date, time, language, setpoint- and
limit values, operating mode).
The recommended target values of all settings
are documented in the form “Form for set values
of BWT bestaqua 6,12,18“ (see Part 7.1).
Document the parameters after you have set all of
the data at the device.
Please use the template at the end of the operating
instructions.
3.7.1 Menu: SETUP
General settings:
Note: The change in the programming menu is avai-
lable from both the main screen “pause“ as well as
from the detail overview display “PAUSE“.
p a u s e
PERM 3.2 bar
PUMP _ _ _ bar
PAUSE
03- 12 - 13 15 : 58
Confirm with the [] button to shift into the
programming menu.
EXIT
SERVICE
STOP DELAY
AUTO RINSE
SETUP
Fig. 10: Main selection menu: “SETUP“
The “SETUP“ selection menu appears:
The menu item “DATE“ is active.
DATE / TIME Date ; time
CONDUCTIVITY / TDS PERMANENTLY DEACTIVATED
OPERATION MODE Operation mode (online/offline)
LANGUAGE Setting of the menu language
BACK Quit menu and return to selection menu
Fig. 11: Display of the activated “SETUP“ menu.
Perform the general settings of the “SETUP“ selection menu in
accordance to: Fig. 12, Fig. 13.

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Fig. 12: Programming procedure: “SETUP“ –Example scheme
Fig. 13
AUTO RINSE
SERVICE
STOP DELAY
SETUP
EXIT
DATE / TIME
CONDUCTIVITY / TDS
OPERATION MODE
LANGUAGE
BACK
DATE
18 – 7 – 11
DATE
19 – 7 – 11
DATE
19 – 7– 11
DATE
19 – 8– 11
DATE
19 –8 – 11
DATE
19 – 8 – 13
DATE / TIME
CONDUCTIVITY / TDS
OPERATION MODE
LANGUAGE
BACK
TIME
13 : 11
TIME
19 : 11
TIME
19 : 11
TIME
19 : 21
DATE / TIME
CONDUCTIVITY / TDS
OPERATION MODE
LANGUAGE
BACK
DATE / TIME
CONDUCTIVITY / TDS
OPERATION MODE
LANGUAGE
BACK
ENGLISH
DEUTSCH
FRANCAIS
ITALIANO
BACK
ENGLISH
DEUTSCH
FRANCAIS
ITALIANO
BACK
ENGLISH
*DEUTSCH
FRANCAIS
ITALIANO
BACK
ENGLISH
DEUTSCH
FRANCAIS
ITALIANO
BACK
ENGLISH
* DEUTSCH
FRANCAIS
ITALIANO
BACK

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Note: The mentioned setting range for
pressure has only in the ONLINE mode
an effect.
In the OFFLINE mode the pressure stops
are firmly defined at 2.0bar.
Fig. 13: Programming procedure: “OPERATION MODE“, “PRESSURE SET“ –Example scheme
OPERATING MODE
PRESSURE SET
BACK
PASSWORD
_ _ _ _ _ _
STOP AT 2.1 bar
STOP AT 3.1 bar
OPERATING MODE
PRESSURE SET
BACK
*ON-LINE
OFF-LINE
BACK
*ON-LINE
OFF-LINE
BACK
ON-LINE
*OFF-LINE
BACK
ON-LINE
*OFF-LINE
BACK
DATE / TIME
CONDUCTIVITY / TDS
OPERATION MODE
LANGUAGE
BACK
Fig. 12
to call up the “LANGUAGE“ menu refer to Fig. 12
PASSWORD:
OPERATING MODE
PRESSURE SET
BACK
Setting range for:
“inlet pressure“ 2.0 ... 4.0 bar
» incremental steps « : [+/- 0.1 bar]

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3.7.2 Menu: SERVICE
s¬Settings of SERVICE parameter:
Press the arrow keys to call up the menu screen.

The main selection menu appears with “SERVICE“ being
activated.
EXIT
SERVICE
AUTO RINSE
STOP DELAY
SETUP
Fig. 15: Main selection menu: “SERVICE“
1. Menu level (selection menu “SERVICE “)
SERVICE INTERVAL Service interval (ACTIVE)
SERVICE RESET Reset of the service interval to 365 days
BACK Quit menu and retun to selection menu
Fig. 15a: Menu Level 1: “SERVICE“
The settings of the “SERVICE INTERVAL“ selection menu
shown in Fig. 16 are not adjustable.
PASSWORD ENTRY:
SERVICE DAY Service time in days
SERVICE PRE-FILTER PERMANENTLY DEACTIVATED
SERVICE POST-FILTER PERMANENTLY DEACTIVATED
BACK Quit menu and retun to selection menu
Fig. 15b: Menu Level 2: “SERVICE settings“
Note: The menu “SERVICE INTERVAL“ is secured by a
password. Please contact the BWT service, in case of
a change of the system settings.
The current servicecounter of the service interval “ *** days “ is
accessible via the mode “READY“ by pressing the [] button.
155 days
With a present counter value of “0 days“ the message:
“SERVICE IN:“ and an audible signal appears, to rembember
the user of the next maintenance.
SERVICE IN:
Note: The menu “SERVICE INTERVAL“ is secured by a
password. Please contact the BWT service, in case of
a change of the system settings.
The current servicecounter of the service interval “ *** days “ is
accessible via the mode “ready“ by pressing the [] button.
155 days
With a present counter value of “0 days“ the message:
“SERVICE IN:“ and an audible signal appears, to rembember
the user of the next maintenance.
SERVICE IN
DAYS: xxx ver. xyz

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Password
input:
Fig. 16: Programming procedure: “SERVICE INTERVALL“ (no further settings possible) –Example scheme
AUTO RINSE
SERVICE
SETUP
STOP DELAY
EXIT
2x
SERVICE INTERVAL
SERVICE RESET
BACK
PASSWORD
_ _ _ _ _ _
SERVICE DAY
SERVICE PRE-FILTER
SERVICE POST-FILTER
BACK
SERVICE DAY
SERVICE PRE-FILTER
SERVICE POST-FILTER
BACK
SERVICE DAY
SERVICE PRE-FILTER
SERVICE POST-FILTER
BACK
SERVICE DAY
SERVICE PRE-FILTER
SERVICE POST-FILTER
BACK
PASSWORD:

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Fig. 19: Programming procedure: “AUTO RINSE“
AUTO RINSE
SERVICE
SETUP
STOP DELAY
EXIT
SET RINSING TIME
START RINSING
BACK
SET RINSE TIME
6: 30
DISABLE
SET RINSE TIME
2: 00
DISABLE
SET RINSE TIME
2: 00
DISABLE
SET RINSE TIME
2: 00
ENABLE
SET RINSING TIME
START RINSING
BACK
rinsing
3.7.3 Menu: AUTO RINSE
Press the arrow keys to call up the detailed overview screen.
Select the detail item “PAUSE“ and confirm with [] button to
shift into the programming menu.
PERM 3.2 bar
PUMP _ _ _ bar
PAUSE
03- 12 - 13 15 : 58
The unit is in the selection menu at the menu item “AUTO RINSE“.
EXIT
SERVICE
STOP DELAY
AUTO RINSE
SETUP
Fig. 17: Main selection menu: “WATER-FILL“
The following operational parameters may be set in the
“AUTO RINSE“ selection menu Fig. 18:
SET RINSING HOUR Time setting for automatic rinsing
START RINSING Starts of the manual rinsing manually
BACK Quit menu and back to selection menu
Fig. 18: Menu Level 1: “AUTO RINSE“
The menu item “SET RINSING HOUR“ is active.
Automatic interval rinsing / SET RINSING HOUR:
The menu “SET RINSING HOUR“ allows a automatic interval
rinsing at a set time that has to be programmed by the user.
The input of the time set is made in steps of » 30 minutes «.
Default setting: “SET RINSE TIME“ 02:00 a.m.
Manual interval rinsing / MANUAL RINSING:
ATTENTION: The manual flushing begins immediately
(analogue of internal time set). The RO unit rinses manu-
ally.
The unit begins the rinsing immediately after the selection “START
RINSING“. A manually activation of the hygienic flushing reduces
the risks of stop contamination. In order to perform the rinsing the
unit opens the inlet solenoid valve.

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4.1 Overview of the Status- and Alarm LED
Status and alarm: LED colour /indication: Description of the unit status:
ready/READY green /flashing Ready for new permeate demand
working/WORKING (production) ●green /lights up Normal operation, the RO´s pump is active
flush (internal rinsing) ●green / lights up 2INSING¬INTERNALLY¬-ODE¬!
PAUSE/ EXT. PAUSE green /flashing Normal operation, no incoming signal
External pause (Option) green /flashing External operation with superordinate control
Service (maintenance) ●red / lights up RO filter elements are soiled or blocked
Alarm ●red /lights up Indication of a failure event
Unit OFF (without current) Off ... Power off
Reset of alarms by the customer:
Observe: In any case of a failure with a permanently red lightning LED the operator must check the RO unit and if necessary
switch it off. In case of an off switching the operator have to wait briefly (approx. 30s) before turning the RO unit on again.
4.2 Trouble shooting guide
Please observe: If your reverse osmosis is not performing as it should, please run through the alarm messages below.
In the event of a fault, repair work may only be carried out by an expert (SERVICE technician).
Alarm / malfunction list: Possible reasons: Acknowledgement:
SERVICE
1: “SERVICE“
s¬Carrying out service work Call SERVICE team
Repair defect parts
2: “No raw water“
s¬.O¬WATER¬SUPPLY¬DUE¬TO¬CLOSED¬SHUTOFF
valves or other closings at the inlet
s¬.O¬PRESSURE¬AT¬THE¬WATER¬SUPPLY
s¬Prefilter is blocked
s¬7ATER¬INLET¬PRESSURE¬TOO¬LOW
Open the main stop valves and if necessary
check the water supply
Check the filter and replace if necessary.
Observe the operating instructions of the
external prefilter.

Check that the water supply pressure is bet-
ween 2.0 to 6.0 bar.
leakage
allagamento
fuite d´eau
leckage
3: “leakage“
(continuos warning sound)
s¬7ATER¬LEAKS¬FROM¬THE¬DEVICE
Separate the unit from the power-supply and
the water network
Call SERVICE team

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4.2 Trouble shooting guide
Please observe: If your reverse osmosis is not performing as it should, please run through the alarm messages below.
In the event of a fault, repair work may only be carried out by an expert (SERVICE technician).
Alarm / malfunction list: Possible reasons: Acknowledgement:
FAULT 1
4: “FAULT 1: Pump Relay“
s¬0UMP¬RELAY¬defective Call SERVICE team
FAULT 2
5: “FAULT 2: Pump fuse“
s¬Pump defective (fuse protection)
s¬-OTOR¬FAULT¬CHECK¬OPERATING¬PARAMETERS
s¬Pump is mechanically blocked or
damaged
Call SERVICE team
Replacement of pump motor
FAULT 3
6: “FAULT 3: Pressure sensor
permeate“
s¬0RESSURE¬SENSOR¬DEFECTIVE¬PERMEATE
s¬#ABLE¬CONNECTION¬DEFECTIVE¬OR¬INPROPER¬WIRE¬
rupture)
Call SERVICE team
Replacement of pressure sensor
FAULT 4
7: “FAULT 4: Pressure sensor
pump“
s¬0RESSURE¬SENSOR¬DEFECTIVE
s¬#ABLE¬CONNECTION¬DEFECTIVE¬OR¬INPROPER¬WIRE¬
rupture)
Call SERVICE team
Replacement of pressure sensor

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5.1 Maintenance and wearing parts
You have purchased a product that is durable and easy to service.
However, all technical equipment requires regular servicing in order to guarantee optimal functionality.
If the product malfunctions during the warranty period, contact your contract partner, the installation company,
and quote the unit type and production number (see technical specifications or the type plate on the unit).
Please exchange the wearing parts in the specified maintenance intervals:
Please observe!
s¬)N¬ORDER¬TO¬SAFEGUARD¬UNOBJECTIONABLE¬FUNCTIONING¬AND¬OPTIMUM¬WATER¬QUALITY¬maintenance is to be performed at
regular intervals by our service technicians, at least however, once a year.
✔Consider as well the instruction manual of the external installed pre-filter.
✔Prior to working on electric components and a opened housing, ensure carefully that the device
has been deactivated by unplugging the mains plug and therefore has zero potential.
✔Any maintenance work should include a check of the connecting lines and the housing.
Note: The replacement of the wearing parts must be effected by
qualified compartment staff. (Plumber or customer BWT service).
Exchange of wearing parts:
Maintenance work: Responsible: Recommended maintenance interval:
✔General visual inspection Customer Weekly
✔Check of tightness Customer Weekly
✔Cleaning with a moist cloth Customer As required
➤Conductivity (value of measuring device) Customer, service At least, once a year
➤Exchange of the pre-filter insert Customer, service At least, 2 times a year
➤Exchange RO membrane elements Service At least, once a year
➤Exchange of high-pressure pump head Service Every 2 years
➤Exchange of connections/pressure hoses Service Every 5 years
➤Water hardness test Service At least, once a year
Please observe: According to BGV A2 (VBG4), the electrical safety check is to be conducted every 4 years.
The BWT bestaqua 6,12,18 devices have been designed in compliance with the “Pressure Equipment Directive“
97/23/EC of 29th¬-AY¬¬4HEREFORE¬IT¬MEETS¬THE¬REQUIREMENTS¬OF¬!RTICLE¬¬3ECTION¬¬AND¬IS¬CONSEQUENTLY¬
manufactured and assembled in accordance with applicable good engineering practice.
The BWT bestaqua 6,12,18 devices do not receive a CE mark in accordance with Article 15 of Directive 97/23/EC.
However, the attached EC declaration of incorporation is applicable.
Note: To ensure reliable production and to meet the requirements of our customers or to extend the warranty, our
company offers the conclusion of a BWT service contract.
✔BWT service or a contract guarantees the professional, regular examination in which all important components
are cleaned, checked and in which wearing parts are replaced.
✔Please ask about our services.