BWT Bewazon VULW 12 User manual

Changes reserved!
1-510385 / 12645 / 2019-06 / © BWT Wassertechnik GmbH / Printed in Germany
Installation and operating manual EN
Bewazon
VULW
Ozone generation unit
Type: VULW 12 – 700

2
Thank you very much for the con-
dence that you have shown in us by
purchasing a BWT appliance.
EN
Table of Contents Page 3

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Table of Contents
1 Safety Instructions 4
1.1 General safety instructions 4
1.2 Scope of the documentation 4
1.3 Personnelqualications 4
1.4 Transport and installation 4
1.5 Symbols used 4
1.6 How safety instructions are displayed 5
1.7 Product-specicsafetyinstructions 5
2 List of supplied parts 6
2.1 Type designation code 6
3 Use 7
3.1 Intended Use 7
3.2 Foreseeable misuse 7
3.3 Disclaimer 7
4 Function 7
4.1 Air drying 7
4.2 Ozone generation 7
4.3 Function monitoring 9
4.4 Power failure 9
4.5 Control connections 9
4.6 External safety monitoring 9
5 Installation conditions 10
5.1 Unit safety 10
5.2 Installation location 10
5.3 Room ventilation 10
5.4 Transport and unloading 10
6 Installation 12
6.1 Assembly 12
6.2 Ozone connection 12
6.3 Cooling water 12
6.4 Electrical connections 12
7 Start-up 13
8 Operation 14
8.1 General Information 14
8.2 PLC settings 14
8.3 Ozone generation 17
8.4 Bewazon Therm cooling water loop
(optional) 21
8.5 P/PID controller, analogue output
(optional) 23
8.6 Dryer mode 26
8.7 Databus connection (optional) 28
9 Operator Responsibilities 29
9.1 Inspection 29
9.2 Maintenance 29
9.3 Maintenance messages 30
10 Troubleshooting 31
10.1 Warning messages 31
10.2 Fault messages 32
11 Warranty 37
12 Technical Data 38
12.1 Single-circuit units
in the standard design * 38
12.2 Units with a standard design * 40
12.3 Units with a standard design * 41
12.4 Type plate 42
13 Decommissioning and Disposal 43
13.1 Decommissioning, temporary 43
13.2 Decommissioning, permanent 43
13.3 Disposal 43
14 Standards and legal regulations 44
14.1 Legal use of ozone 44
15 Log Book 45
EU Declaration of Conformity 47

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1 Safety Instructions
1.1 General safety instructions
The product was manufactured according to all recognised regulations
and technical standards and was in compliance with the relevant legal
requirements when it was put into circulation.
Nevertheless, it can pose a risk of personal injury or property damage if
you do not observe this chapter and the safety instructions throughout
this documentation.
●Read this documentation thoroughly and in full before working with
the product.
●Retain the documentation in such a way that it is accessible to all
users at all times.
●Always hand over the product to third parties together with the full
documentation.
●Follow all of the instructions in relation to the proper handling of the
product.
●If you detect damage to the product or the mains supply, stop its
operation and notify a service technician immediately.
●Use only accessories, spare parts and consumable materials that
have been approved by BWT.
● Adheretotheenvironmentalandoperatingconditionsspeciedin
the “Technical data” chapter.
●Use your personal protective equipment. It ensures your safety and
protects you from injury.
●Only perform tasks that are described in these operating instructions
or if you have been trained to do so by BWT.
●Perform all tasks in compliance with all applicable standards and
provisions.
●Instruct the operator in the function and operation of the product.
●Instruct the operator in the maintenance of the product.
●Instruct the operator in relation to potential dangers that may arise
while operating the product.
1.2 Scope of the documentation
This documentation applies exclusively to the product the production
number of which is listed in chapter 12 “Technical Data”.
This documentation is intended for operators, installers without training
from BWT, installers with training from BWT (e.g. drinking water specia-
lists), and BWT service technicians.
Thisdocumentationcontainsimportantinformationforttingtheproduct
safely and properly, starting up, operating, using, maintaining, and di-
sassembling the product, and for correcting simple faults independently.
Read this documentation in full before working with the product. Pay
particular attention to the chapter “Safety Instructions”.
1.3 Personnel qualications
The installation work described in these instructions requires basic
knowledge of mechanics, hydraulics and electrical systems as well as
knowledge of the corresponding specialist terms.
To ensure that the device is installed safely, this work must be performed
onlybyaqualiedspecialistoratrainedpersonundertheguidanceof
aqualiedspecialist.
Aqualiedspecialistisanyonewhocanassesstheworkassignedtohim
or her, identify potential risks, and take suitable safety measures thanks
to his or her specialist training, knowledge and experience as well as
hisorherknowledgeoftheapplicableregulations.Aqualiedspecialist
must comply with the applicable specialist regulations.
An instructed person is anyone who has been instructed and, if neces-
sary,trainedbyaqualiedspecialistinthetransferredtasksandthe
potential risks presented by improper behaviour and who has been
educated about the necessary protective equipment and measures.
1.4 Transport and installation
To avoid damage during transport to the installation location, do not
remove the BWT product from the packaging until you have reached the
relevant location. Then dispose of the packaging in the correct manner.
Check that the delivery is complete.
If there is a risk of frost, drain all components that convey water.
Lift or transport the product or its components only from the designated
suspension eyes or attachment points, if present.
Theproductmustbeinstalledormountedonasu󰀩cientlystrongand
level horizontal surface and must be adequately secured against falling
or tipping.
1.5 Symbols used
This symbol indicates general hazards for people,
machines or the environment.
This symbol indicates hazards due to electric shocks
from live components.
This symbol indicates hazards for the eyes and skin
due to ultraviolet rays.
This symbol indicates that this electrical and electronic
equipment must not be disposed of with household
waste at the end of its life.
This symbol indicates that the product can be recycled
at the end of its life.
This symbol instructs you to disconnect the unit’s
power supply.
It ensures your safety and protects you from injury.
Here:Mainswitcho󰀨(0).
This symbol instructs you to use your personal pro-
tective equipment (PPE).
It ensures your safety and protects you from injury.
Here: Wear protective goggles.

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1.6 How safety instructions are displayed
In this document safety instructions precede any sequence of actions
that could cause harm to persons or damage to property. All hazard
prevention measures must be followed. Safety instructions are displayed
as follows:
SIGNAL WORD!
Source of hazard (e.g. electric shock)
Type of hazard (e.g. risk of fatal injury)!
►Escape or prevent hazard
►Rescue measure (optional)
Signal word / colour Indicates the severity of the hazard
Warning symbol Calls attention to the hazard
Source / type of hazard Indicates the type and the source of the
hazard
Consequences Explains the consequences of not following
the safety instructions
Hazard prevention
measure
Explains how to avoid the hazard
Signal word Colour Severity of the hazard
DANGER High-risk hazard.
Indicates a hazardous situation which,
if not avoided, will result in death or serious
injury.
WARNING Hazard with a moderate degree of risk.
Indicates a hazardous situation which,
if not avoided, could result in death or
serious injury.
CAUTION Low-risk hazard.
Indicates a hazardous situation which, if
not avoided, may result in minor or mode-
rate injury.
1.7 Product-specic safety instructions
When the ozone generation system is running, the high voltage com-
ponents in the unit are live. The high voltage supply is automatically
switchedo󰀨whenthecabinetisopened.
DANGER!
High voltage
Risk of death by electric shock!
►Disconnect the system power supply before all
maintenance repair work.
►There may still be voltage from external
connections even when the mains voltage is
disconnected.
►Discharge live components through earthing.
Ozone is an irritant gas with a pungent odour. If it escapes within the
installation space, press the emergency stop switch immediately or
switcho󰀨theozonegenerationintheunit.Thereisstillamainsvoltage
inthecabinetwhentheunitisshuto󰀨usingtheemergencystopbutton.
DANGER!
Ozone
Risk of death from inhalation!
►Shut down the unit in the event of a warning.
►Leave the operating room.
►Use protective respiratory equipment.
When working on ozone generation units, please ensure that the general
rules and regulations for operating high voltage systems, the EC safety
data sheet for ozone, the regulations for the use of ozone in water
treatment (German Social Accident Insurance (DGUV) rule 103-001 of
BG gas water) and the accident prevention regulations for ozone are
complied with.
The ozone concentrations in the ozone-air mixture may be hazardous
to humans if allowed to escape into the room where the unit is installed.
Safety precautions must be taken to ensure that ozone is not inhaled.
The MWC value for ozone for ozone in ambient air is 200 µg/m³
(=0.1ppm,MWC=maximumworkspaceconcentration).See:Leaet
M052 “Ozone” BGI 745, published by BG Chemie.
Roomswhichcouldbea󰀨ectedbyozoneleaksifafaultoccursmust
bemonitorede󰀨ectivelybyozonegasdetectorswithvisualandaudible
warning systems, which stop the ozone generation unit when actuated.
Emergency stop buttons, labelled as such, must also be installed in easily
accessible, hazard-free places near all doors of the ozone room. See:
“Directives for the use of ozone for water treatment, DGUV-R 103-001”.
These devices must be checked regularly as part of the maintenance
process to ensure that they function properly.
TheunitsaredesignedasunderpressureunitsasdenedbyDIN19627.
In underpressure units, the gas used/ozone in the whole gas compart-
ment up to the ozone/water mixing device is under a pressure that is
lower than the air pressure of the surrounding installation area. It is
thereforephysicallyimpossiblefortheozonetoowoutfromthegas
compartment into the installation area air.
During dryer regeneration, hot air at a temperature of up to 200 °C (see
Technicalspecications)escapeson theleftside ofthecabinetand/
or from the top.
WARNING!
Hot exhaust air (200°C)
Burn hazard!
►Keep your distance
►Do not install heat-sensitive objects, electrical
lines, or water lines directly above the unit

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2 List of supplied parts
2.1 Type designation code
Type designation code for standard units and Bewazon VULW
w x y z special units
w = 12, 25, 45, 70, 140, 210, 280, 350, 420, 490, 560, 630, or 700
(unit capacity in grammes of ozone per hour)
x = Roman numeral (for the number of circuits for multi-circuit
units) or space (for single-circuit units)
y = VA or PVC (basic material of the ozone generator)
z = TA (dryer for tropical areas) or space (for standard model)
Special units are units with:
x = II, III, IV
z = TA
BWT standard cabinet ozone devices comprise:
1 Air dryer
2Airowmeter
3 Regeneration blower
4 Ozone generator made of stainless steel
5 Valve controller for dryer
6 High voltage transformer
7 Voltmeter
8 Ammeter
9 Touch panel (TP) control unit display with operation functions.
Operating element with plain text display in a selection of
9 languages
12 Fault signal lamp
13 Power supply lamp
14 Main switch
Optional equipment Order number
PVC ozone generator on request
P/PID controller 16015
Analogue output 16016
ProbusDPdatabusinterface 16017
Pronetdatabusinterface 16018
Integrated cooling water loop for Bewazon
VULW 12 to 280: Bewazon Therm 100
14788
Integrated cooling water loop for Bewazon
VULW 350 to 700: Bewazon Therm 300
14789
UPS for PLC 16012
Bewazon 70 - 140
1
6
3
4
2
5
2
9
7
8
12
13
14

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4 Function
Ozone is a colourless gas with a characteristic odour. Chemically, ozone,
or O3, consists of three oxygen atoms and can be produced from the oxy-
gen, or O2, in the air. A relatively high concentration of ozone is required
fore󰀨ectivedisinfectionofpoolwaterandoxidationofunwantedwater
contaminants. When air is used as feed gas such high concentrations
can only be obtained if the air is dried prior to ozone generation.
4.1 Air drying
The unit contains two dryers that work alternately. Each dryer contains a
specialmixtureoftwodesiccantsinamulti-layeredlling.Thedesiccant
extracts moisture from the passing air by adsorption, so that the dewing
point of the air on leaving the dryer is lowered to under –50°C.
The desiccant has limited water absorption capacity, and must be
regenerated when the capacity is exhausted. The unit regenerates the
desiccantautomatically.Inaddition,aregenerationairowisheatedin
a heating register and fed through the dryer in the opposite direction.
The air is heated until the temperature at the regeneration air inlet of
the dryer has reached 220°C. The temperature of the regeneration air
is maintained at this value using a thermostat. Hot air is fed through the
dryer until the temperature at its regeneration air outlet has reached
140°C; this ends the regeneration heating time. The unit displays the
warm-up time and heating time. The dryer then cools down. Once it
reaches room temperature again, regeneration is complete. While one
dryer is being regenerated, the unit can be operated using the other dryer.
Thecycletimeofadryeriscalculatedfromtheairowthatitdriesand
the maximum moisture content of this air. The operator can set both of
these values on the TP (touch panel).
The ozone is generated and conveyed using vacuum. The air is drawn
through the unit by an external suction pump. The suction pump can be
an injector driven by a booster pump.
TheunitsaredesignedasunderpressureunitsasdenedbyDIN19627.
In underpressure units, the gas used/ozone in the whole gas compart-
ment up to the ozone/water mixing device is under lower pressure
than the air in the surrounding installation area. It is therefore physically
impossiblefortheozonetoowoutfromthegascompartmentintothe
installation area air.
4.2 Ozone generation
Four operating modes are provided for switching ozone generation on/
o󰀨.Panel,ext.contact,ext.+P/PID,databus:
1. Panel: manually on the device
2. Ext. contact: The unit is switched on using an external customer-
suppliedoatingcontact
3.Ext.+P/PID(P/PIDcontrolleroption):Theunitisswitchedoninthe
same way as point 2 if ozone is also requested simultaneously using
the P/PID controller signal.
4.Databus(Pronet/Probusoption):Activationissetexternallyusing
the data bus. The available data bus connections are:
a)Pronetwithdataexchangeusing“Put/Get”commands
b)Pronetwiththeintegrationoftheozonedeviceintothecustomer
controlsystemusinga“GSD”le
c)ProbusDPwiththeintegrationoftheozonedeviceintothecustomer
controlsystemusinga“GSD”le
In addition to the activation signal, the release for ozone generation must
be set on the panel. The unit starts up when the release and activation
signal are provided.
If ozone generation activated, there is a purge phase with air beforehand.
The pre-operation purge removes any remnants of moist air from the
ozone tubes.
To generate ozone, dry air is fed to a discharge gap in the ozone tube.
A high voltage discharge is ignited across this discharge gap. The ozone
is formed from the oxygen in the air within the corona plasma created
during this process: 3 O2→2 O3.
3 Use
3.1 Intended Use
BWT Bewazon VULW 12 to 700-series ozone devices produce ozone
by means of corona discharge and comply with the requirements of the
standard DIN 19627.
Ozone is ideally suited for the oxidation of unwanted contaminants in wa-
ter and the disinfection of water, especially pool water (see DIN 19643).
Bewazon VULW 12-700-type systems are designed in compliance with
the following standards for industrial applications:
– DIN EN 61000-6-2.
– DIN EN 61000-6-4.
3.2 Foreseeable misuse
●Any use other than the use described under point 3.1.
●Not adhering to the prescribed process parameters and mainte-
nance and service intervals.
● Unauthorisedalterationormodicationofpartsoftheunit.
●The use of unauthorised spare parts.
3.3 Disclaimer
The manufacturer is released from any liability if the customer intenti-
onally or forcibly removes or circumvents guards or safety devices, if
the customer uses unauthorised spare or wear parts, or if the customer
does not follow the instructions in this operating manual or on the unit.

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Heat is released by the corona discharge. The heat is dissipated by
cooling water. The condition of the cooling water is not changed, other
than an increase in the temperature. Thecoolingwaterowismeasured
and monitored by the unit, which displays the current value.
When the releaseor activation signal for ozone generation is cancelled,
the unit performs an air purge phase. The post-operation purge clears
the ozone from the ozone tubes and, depending on the duration, from
the downstream components as well. The duration of the purge phases
can be set from 0 to 15 minutes using the TP.
The ozone production capacity is adjustable in 16 levels. There are four
operating modes for the adjustment: Panel, proportional controller, PID
controller, data bus.
1. Panel: Manually directly from the TP as a stage from 0 to 16.
2. Proportional controller (P/PID controller option): The ozone level is
set proportionally to an external 4 to 20 mA signal. For example,
thesignalcancomefromtheowmeterofawaterowintowhich
the ozone is to be mixed. This operating mode facilitates ozone
metering with the addition of a virtually constant amount per m3of
waterregardlessofthewaterowvolumeandthatreactsquickly
tochangesinthewaterow.
3. PID controller: The ozone level is set by the internal PID controller
in accordance with an external 4 to 20 mA measurement signal.
The controller sets the ozone level so that the measurement signal,
which corresponds to the current ozone concentration in the water,
for example, is aligned with a nominal value set by the operator. This
operating mode facilitates ozone metering which keeps the ozone
concentrationinthewatervirtuallyconstant,regardlessoftheow
volume and ozone consumption of the water. Ozone metering reacts
relativelyslowlytotheowandtheozoneconsumptioninthewater.
4. Databus(Pronet/Probusoption):Theozonelevelissetexternally
using the data bus. The available data bus connections are:
 a)Pronetwithdataexchangeusing“Put/Get”commands
 b)Pronetwiththeintegrationoftheozonedeviceintotheexternal
controlsystemusinga“GSD”le
 c)Probus DP with the integration of the ozone device into the
externalcontrolsystemusinga“GSD”le
Multi-circuit units (special design)
If ozone is required for multiple ozone applications that are independent
of each other, these ozone applications can be supplied by a multi-circuit
unit. A multi-circuit unit is an ozone device with a special design that
has ONE air dryer and up to FOUR ozone circuits that can be controlled
independently of each other with a total capacity of 700 g/h.
Tropical version (special design)
To use the ozone devices in countries with very high humidity (for ex-
ample, in tropical countries) the units can be equipped with double the
dryer capacity. The units can then be used in air humidity of up to 40 g/
Nm3(corresponds to approx. 60% relative humidity at 40°C) and with a
higher cooling water temperature of up to 30°C.
Bewazon Therm cooling water loop (optional)
Using the cooling water loop ensures that the level of cooling water
consumption corresponds to the requirements. The cooling water is no
longer guided through the unit in a simple cycle. Instead, it is repeatedly
guided through the unit in a circuit with a small storage container until
its temperature reaches a maximum level of 25°C.
If the ozone device is activated, cooling water is requested and the
cooling water loop is also activated. The temperature of the water is
monitored by a thermostat in the circuit.
When the temperature limit is reached, the heated cooling water is repla-
ced with fresh cold water while the ozone device continues to run. The
heated water can be used again by feeding it into the splash water tank
(untreated water storage tank), for example, when changing the water.
The cooling water loop unit is installed next to the ozone device and
controlled and monitored by the ozone device PLC.
Pre, post-operation purge
1
0
1
0
Ozone generation
Functional diagram: Ozone generation
Ozonerelease+
Activation signal
1
0
Pressure booster pump
1
0
0 to 50 min0 to 50 min
Functional diagram: regeneration
1
0
CoolingHeating time
Regeneration period, e.g. 3,5 hours
Warm-up time

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Ozone-water mixture (optional)
The ozone-water mixing device is an important part of the ozonation
process. The mixing device draws the ozonic gas from the unit and
mixes the ozone with the water. The BWT mixing device guarantees
optimale󰀩cacy(mixinge󰀨ect)withminimumuseofenergy.Theozone
is dissolved in the water, resulting in rapid and safe reaction of the ozone
with the water contaminants.
4.3 Function monitoring
The ozone device is controlled and monitored by a programmable logic
controller (PLC). The operator can use the TP (touch panel) to intervene
in the program sequence and set the operating condition required.
The TP display shows all operating condition messages, operating values
and fault messages as plain text in the 9 languages available: German,
English, French, Italian, Spanish, Polish, Russian, Chinese, Indonesian.
– The current ozone output
– The remaining capacity or the remaining running time of the dryer
while in operation
– The remaining regeneration time of the dryer being regenerated
4.4 Power failure
The PLC permanently stores all operating parameters in the event of
a power failure.
Caution: After a prolonged power failure or if the power supply has been
disconnected for a long time, the remaining capacity of both dryers is
set to zero after about 24 days. When power returns, both dryers are
automatically regenerated in succession. The unit starts generating
ozoneonlyaftertherstdryerisregenerated.
If the power returns before 24 days pass, the unit continues operation
in the same operating condition it was in prior to the power failure.
Exception: Fault messages are deleted when the unit restarts after a
power failure.
4.5 Control connections
Youcanndanoverviewoftheunit'scontrolconnectionsintheelectri-
cal circuit diagram on sheet “H”. The connections perform the following
function:
Remote ozone on
Theozonedevicecan beswitched onand o󰀨from aremote control
point via this contact if the operating mode for “switch on ozone” on the
unit is set to “ext. contact” and the operator has enabled the local ozone
generation release for the unit. Ozone is generated in accordance with
the pre- and post-operation purge durations.
Post-operation purge
Whenthesystemisshuto󰀨,ozonegenerationisshuto󰀨andthepost-
operation purge is triggered. In order to carry out the post-operation
purge, the same hydraulic conditions as are required for ozone operation
must be maintained until the post-operation purge is completed. This me-
ans that all required pumps, such as circulation pumps, must continue to
run during the post-operation purge. The ozone device itself makes sure
that the booster pump operates correctly (see “Booster pump enabled”).
The post-operation purge can be cancelled from the control point by
switchingo󰀨theacknowledgementsignalfromtheboosterpumpduring
the post-operation purge. This facilitates setting the actual post-purge
duration via the control point. Post-operation purges of varying duration
can be implemented in this way. The duration set on the TP must be
at least as long as the longest post-operation purge. The system can
also be switched o󰀨 immediately without a post-operation purge by
simultaneouslyswitching o󰀨the contactsof the“RemoteOzone On”
and “Booster pump acknowledgement” inputs.
Booster pump enabled
When ozone generation is enabled, the unit starts the integrated booster
pumptobuilduptheairowusingthiscontact.Asanoption,thebooster
pump power switch and acknowledgement signal can be integrated into
the ozone device as a special order.
The booster pump must have direct acting control, that is, without
interference from other external control signals. Non-observance can
result in serious damage to the device (see the circuit diagram, sheet H).
Booster pump acknowledgement
This contact sends an acknowledgement signal to the ozone device to
conrmthattheboosterpumpofthecircuitinquestionison.Theboos-
ter pump is switched on when ozone generation is enabled. When the
booster pump acknowledgement signal is received, the power supply
ofthehighvoltagetransformerandthecoolingwaterowfortheozone
tubes are activated.
Whenswitchingo󰀨ozonegeneration,itisstillpossibletodeterminethe
post-operation purge duration from the control point using this contact;
see Post-operation purge.
Regeneration blower operation
The adsorbed moisture is expelled from the dryer while the regeneration
blower is operating. The reg. blower operation dry contact can be used
to increase room ventilation in this period.
Flow monitor for cooling water
For monitoring an existing cooling water ow, this contact gives you
theoptionofconnectingthelimitcontactofanexternalowmeter.To
do so, the “Monitoring cooling water” operating mode has to be set to
“Thermostat+min.contactowmeter”.
4.6 External safety monitoring
Fault/fault free
The operating condition (operation/fault) of the unit can be monitored
remotely via a dry group fault message contact (CIC). The contact is
closed when no faults are pending. In the case of units with data bus (Pro-
net/Probusoption),eachindividualfaultmessageisalsotransmitted.
Gas detector
An ozone gas detector must be installed in all rooms subject to possible
emission of ozone. The sensor must be mounted at a height of approx.
50 cm above the oor. If ozone escapes, the device responds and
switcheso󰀨ozonegeneration.
Emergency stop
An emergency stop button must be mounted near every entrance to the
installation location, to allow ozone generation to be deactivated in an
emergency. When you press the emergency stop switch, the high voltage
supplyandthereforetheozonegenerationareswitchedo󰀨immediately.
However, the mains voltage is not disconnected.
Door safety switch
In the ozone cabinet, a door safety switch is installed for each cabinet
door. When you open the door, the door safety switch switches the high
voltagesupplyandthereforetheozonegenerationo󰀨immediately.

EN
10
5 Installation conditions
5.1 Unit safety
A safety assessment was performed in accordance with EN ISO 13849
for the operation of Bewazon VULW series ozone devices. A performance
level PLr, category “C”, is required for ozone device operation. This is
achieved by safeguarding plant operation by implementing an ozone
gas detector and an emergency stop switch. The ozone gas detector is
to be maintained according to information provided by the manufacturer
to ensure operational safety. The emergency stop switch must have
an MTTFd value1) of at least 30 years. When the unit is operated as
intended, the required performance level PL, category “C”, is achieved
with this on-site protective circuit.
1) MTTFd = Mean Time to dangerous Failure, i.e., the mean time
until a dangerous failure as per EN ISO 13849.
5.2 Installation location
The plant is operated with atmospheric air. The air pressure required
limits the maximum permissible installation altitude to 1000 m above
sea level.
Ambient conditions
NOTE
Theinstallationsitemustfullthefollowing
requirements:
►Ambient temperature
►Relative humidity
►Maximum humidity
For the values, see “Technical data”
The concentrations of aggressive gases in the ambient air must not
exceed the listed thresholds:
Carbon dioxide CO2500 ppm = 900 mg/m3
Hydrogen sulphide H2S 0.1 ppm = 0.15 mg/m3
Hydrochloric acid HCl 0.05 ppm = 0.07 mg/m3
Chlorine Cl20.05 ppm = 0.13 mg/m3
Bromine Br20.01 ppm = 0.07 mg/m3
Dust concentration in air Max. 2.5 mg/m3
If other gases are expected in the ambient air, tests must be made to
determine whether the ozone system can be installed.
5.3 Room ventilation
Theroommustbesu󰀩cientlyventilated,asveryhotandmoistairenters
the room during regeneration, whereas cool and dry air is required to
operate the unit.
The regeneration blower operation dry contact can be used to increase
the room ventilation in a targeted way while operating the regeneration
blower.
If the unit is to be installed in a large machine room containing the entire
water treatment unit, it is usually not necessary to take additional room
ventilation measures if the requirements for room temperature and
humidityspeciedinthetechnicaldataaremet.
5.4 Transport and unloading
The ozone cabinets are delivered in individual cabinets. They must
remain vertical during transport.
Door widths of at least 900 mm and door heights of at least 2500 mm
arerequiredforverticalunloadingatthenaldestination.Thecabinets
maybecarefullytiltedfordoorwaysthatarelowerthanspecied.
Cabinets with ozone tubes must not be placed in a horizontal position.
The cabinets have lifting lugs. See the drawing for use.
max. 45°
90°
Always use all 4 lifting lugs.

EN
11
Space requirements
The ceiling clearance must be at least 2300 mm.
The installation area must be level and dry.
The ozone cabinets must be accessible from the front with a minimum
clearance of 1 m. The back of the unit can be set directly against a wall.
Regenerating the dryer releases hot air of up to 200°C through the top.
No piping or cable links may be installed above the unit.
Connections required
– Cooling water supply
Inlet pressure – see technical data
Pressure variations of more than ± 0.5 bar are not permitted.
 Thecoolingwatersupplylinemustincludeaprotectivelterwitha
lteringe󰀨ectivenessof80to120µm,aowmeterandamanual
owcontrolvalve.Apressurereducermustbeinstalledifthecooling
water pressure exceeds 8 bar.
 Theltershouldbeinstalledsothatitiseasilyaccessible.
Guideline values for the cooling water
Temperature 4° C to 17° C
pH value 6.5 to 9.5
Carbonate hardness < 20 °d
Free of oxidants such as Cl2, OCl-, O3, etc.
Conductivity < 2000 µS/cm
Suspended solids: < 0.1 mg/l
Iron < 0.2 mg/l
Manganese < 0.05 mg/l
Chloride < 250 mg/l
– Cooling water drainage
The cooling water drained from the ozone cabinet remains un-
changed except that the temperature increases by up to 10° C.
Please see DIN EN 806 (previously DIN 1988) if the cooling water
is fed into a closed system.
A safety element that protects against returning water must be
integrated in the outlet.
– Electrical supply
DANGER!
High voltage
Risk of death by electric shock!
►Disconnect the system power supply before all
maintenance repair work.
►There may still be voltage from external
connections even when the mains voltage is
disconnected.
►Discharge live components through earthing.
The power supply to the ozone generator must comply with all applicable
regulations for high voltage generators required by the local power
company. Mains supply 3 x 400 V/N/PE, 50/60 Hz, or 1 x 230 V/N/PE,
50/60 Hz; see the technical data for the individual unit types. The wire
cross section must conform with the overcurrent protection; see the
technical data of the individual unit types).
To limit the impedance of the protective earth, observe the maximum
permissible lengths of the mains supply lines from the protective sub-
distributor according to EN 60204-1.
Example:Forsub-distributorprotectionwithaswitch-o󰀨timeof5se-
conds, table 1 as per EN 60204-1 applies.
Model Cable cross section (mm2) Max. mains supply line length (m)
Bewazon VULW 12 2.5 115
Bewazon VULW 25 2.5 115
Bewazon VULW 45 2.5 115
Bewazon VULW 70 4.0 135
Bewazon VULW 140 6.0 145
Bewazon VULW 210 10.0 125
Bewazon VULW 280 16.0 175
Bewazon VULW 350 16.0 175
Bewazon VULW 420 16.0 175
Bewazon VULW 490 25.0 133
Bewazon VULW 560 25.0 133
Bewazon VULW 630 25.0 133
Bewazon VULW 700 25.0 133
Table1:Maximumlengthofthemainssupplylinewithon-siteprotectionwithaswitch-o󰀨timeof5seconds

EN
12
6 Installation
There should be at least 1 m in front of the cabinet to allow the doors
to be opened.
6.1 Assembly
1. Setupandalignrstcabinet.
2. Insert gasket to second cabinet.
3. Set and align next cabinet.
4. Bolt cabinets together.
5. For additional cabinets, repeat the process from point 2.
6. Anchorallcabinetstotheoorwithscrewsandplugs.
6.2 Ozone connection
Use PVC piping, series 5 (PN16) for the ozone gas line. Connect the
ozone line to the union on top of the cabinet.
If the pipes for the ozone gas line to the ozone-water mixing unit are
longerthan5m,alargernominalwidththanthenominalwidthspecied
intheozoneconnectiontechnicalspecicationsmustbeused.
6.3 Cooling water
If PVC piping is used for the cooling water lines, series 5 PVC (PN16)
must be used.
Cooling water lines should not be installed above the ozone system in
the vicinity of the hot air vents of the dryer. If this is unavoidable, the
pipes must be insulated.
Flushthe supply pipingand ttings betweenthelter andtheozone
system before connection to remove any deposits of dirt.
Connect the supply and drainage pipes to the ttings on top of the
cabinet.
6.4 Electrical connections
OnlybyBWTservicesta󰀨ortrainedpersonnel!
The electrical connections between individual cabinets are completed
duringstart-upbyBWTservicesta󰀨.Thecablesareledintothesystem
through threaded connections on top of the cabinet.
For information about the mains connection, see the technical data.
DANGER!
High voltage
Risk of death by electric shock!
►Disconnect the system power supply before all
maintenance repair work.
►There may still be voltage from external
connections even when the mains voltage is
disconnected.
►Discharge live components through earthing.
For units with a three-phase connection, all three phases must be present
togetheratalltimes;therotatingeldmustturntothe“right”.
See the enclosed circuit diagram for the control and safety connections.
All other installation work must be completed on-site.
Bewazon 350 2 circuit system with stainless steel ozone generators
Hot air
Cooling water inlet
Cooling water outlet
Ozone outlet
 
     

EN
13
7 Start-up
TheunitmayonlybeperformedbyBWTservicesta󰀨ortrainedper-
sonnel.
Pleasefollowtheoperatinginstructionsfortheboosterpump,lteretc.
Start-up can be initiated when the system is fully connected:
1. Close drain valve (C) for cooling water (bottom right, rear of unit).
2. Check power supply breaker F1 (see terminal diagram).
3. Check supply voltage.
4. Check the control and safety connections of the control point.
5. Switch on main switch (14).
– Display on TP (touch panel): Bewazon ozone device ready.
– Set the time; see the operation instructions for directions.
– Acknowledge maintenance notes.
– Check: Power supply lamp on
– Check: Fault signal lamp Open the door to trigger the door switch
fault/emergency stop.
6. Set ozone generation level to zero.
7. Enable ozone generation.
8. Adjustairowatthe(external)injectorusingtheairowmeter(2).
9. SwitchdryerontheTPandcheckairow.
10. If necessary, wait for cooling water to drain.
11. Measure the dew point of both dryers at the connection after the
ozone tubes (A).
12. Check pipes for leaks.
13. Check the thermostat settings for the dryer and cooling water.
14. Verify basic settings of all operating parameters.
15. Perform blower test on both dryers:
– (Request via TP, see chapter 8.6 “Operation”).
 –Checktheairowandrotationdirectionoftheregenerationblower
(3).
– Measure heating current of both heaters.
– Measure blower current consumption.
16. Set ozone generation to 1. After the pre-operation purge, check the
current consumption of the high voltage transformer at the ammeter.
Compare with test log. Multi-circuit systems: The values indicated on
the voltmeter and ammeter (7, 8) only relate to the circuit displayed
on the TP below them (9).
17. Check stages 2 to 14/16 (PVC/VA) with the same process as stage 1.
18. Disable generation release, the system is ready after the post-
operation purge.
Bewazon 350 3 circuit system with stainless steel ozone generators
14
2
9
7
8
3C
A

EN
14
8 Operation
8.1 General Information
CAUTION The unit may only be operated by trained personnel.
Operation is carried out using the touch panel (TP). The display is
touch-sensitive. After the plant is switched on, the “BWT” screen appears
Tapthe“BWT”eldtogototheoperatingstartscreen.Youcannavigate
to all of the other screens for operating the unit from there.
Eachofthesescreenshasan“ESC”(=escape)eld.Ifyoutap“ESC”,
you are returned to the previous screen.
If no entry is made for ten minutes, the touch panel automatically swit-
ches back to the “BWT” screen.
Iftheunitpowersupplyremainsswitchedo󰀨formorethan24days,
both dryers are regenerated when the power supply returns. The unit
is not ready for ozone generation until the regeneration of the rst
dryer is complete.
Next screen: Bewazon VULW start screen
8.2 PLC settings
Start screen
The display shows the name of the unit and the current operating con-
dition of the unit components in plain text and as a diagram.
Youcantapanyoftheframedeldsandanyoftheunitcomponents
represented by graph columns to go to the corresponding next screen.
Next screen: PLC

EN
15
PLC settings:
Note: To change settings, you require the operator password of the
customer (1111) or service password. You can set the language without
the passwords.
Language Set the user language
Maintenance Maintenancedatesandconrmationthatmain-
tenance was performed by service
Fault message
meter
Faults that occur are numbered and displayed
separately for all fault numbers to assess the
operating stability of the unit
Fault history Fault messages that occur can also be viewed
here at a later stage together with the relevant
date and time for the status A (= Appear),
D (= Disappear) and A (= Acknowledge) for the
fault message
Acknowledge-
ment of fault
Groupacknowledgementiftheeldisactive
Screen Screen brightness and cleaning setting
Set time PLC date and time setting
Information
device
Information about the software and hardware
for the PLC and device
System
diagnostics
Information about the PLC operating state
Databus
connection
Connection of the PLC to the building automa-
tion system PLC via databus connection
Extended
settings
SettingsandcongurationofthePLChard-
ware
Next screens: Language, set time, extended PLC settings

EN
16
PLC language screen:
The following languages are available for selection:
– German
– English
– French
– Italian
– Spanish
– Polish
– Russian
– Chinese
– Indonesian
Set time, password
Manyoftheinputeldsarepassword-protected.Tochangesettings,
you require the operator password of the customer (1111) or the service
password.
If you do not make any entries for 10 minutes while you are logged in,
youareautomaticallyloggedo󰀨againandhavetologinagainlater
if required.
Set time
The date and time are required to display messages and fault mes-
sages correctly.
The date and time must be set during start-up and reset if the power
supplyhasbeenswitchedo󰀨formorethan24days.
After you enter the date and time, you apply the values by touching
the“Time->PLC”eld.

EN
17
Extended settings PLC
(only with the service password)
When ozone generation is switched o󰀨, you can change the PLC
hardwarecongurationsettingsfor:
●Installing/un-installing the P/PID controller option (SM 1231)
●Installing/un-installing the analogue output option (SM 1232)
●Installing/un-installing the integrated cooling water loop option
(SM1223+circuitdevice)
Performing the installation:
● Switcho󰀨thepowersupply
●Install the new module (SM) on the PLC
●Switch on the power supply
● Changethecongurationonscreenaccordingly.Donotleavethe
screen
● Switcho󰀨thepowersupply
●Wait for 30 seconds
●Switch on the power supply. It takes several minutes to perform the
hardwarereconguration
Uninstalling:
● Changethecongurationonscreenaccordingly.Donotleavethe
screen
● Switcho󰀨thepowersupply
●Uninstall the module (SM) on the PLC
●Switch on the power supply. It takes several minutes to perform the
hardwarereconguration
Panellogo󰀨:Passwordlogout
Shut down panel: Switch to the panel operating system
CPU run/stop
8.3 Ozone generation
Start screen
Both dryers and the ozone generation are displayed:
The operating states of dryer 1 and dryer 2 are displayed as columns.
When the unit is in operation/ready, the size of the column shows the
capacity still available. During regeneration, it shows the time remaining
for the regeneration. The colour of the column indicates the operating
state itself:
Standby
Operation
Heating up during regeneration
Maintaining temperature during regeneration
Cooling
Not ready, fault
Iftheunitpowersupplyremainsswitchedo󰀨formorethan24days,
both dryers are regenerated when the power supply returns. The unit
is not ready for ozone generation until the regeneration of the rst
dryer is complete.

EN
18
The ozone generation operating state is displayed as a column. Du-
ring the pre-operation purge and post-operation purge, the size of the
column indicates the remaining purge time. The colour indicates the
operating state itself:
Pre-, post-operation purge
Ozone generation
Not ready, fault
Operation indicator: the double arrow icon appears in many of the
follow-on screens; the colour of the arrow indicates the ozone gene-
ration operating state:
Ready/not ready
Pre-, post-operation purge
Ozone generation
Switching the display with multi-circuit units:
With multi-circuit units, a double arrow icon appears for each ozone
circuit. The double arrow icon for the ozone circuit currently displayed
hasaredframe.Thisframeasheswhentheozonecircuitisbeing
operated.Youmanuallyswitchthedisplaytoadi󰀨erentozonecircuit
by tapping the relevant double arrow icon.
When an ozone circuit fault message is issued, the display switches to
this circuit automatically.
Next screen: When you tap “Ozone generation” or “Ozone circuit”, the
ozone device screen opens
Ozone device: Ready/operation
Manyoftheinputeldsarepassword-protected.Tochangesettings,
you require the operator password of the customer (1111) or service
password.
If you do not make any entries for 10 minutes while you are logged in,
youareautomaticallyloggedo󰀨andhavetologinagainlaterifrequired.

EN
19
Ozone device: Ready/operation
Operation mode for “switch on ozone”
The device can be switched on and o󰀨 directly on the touch panel
or by remote control. For the “switch on ozone” switch, there are
4 operating modes:
1. Panel: manually on the device
2. Ext. contact: The unit is switched on and o󰀨 using an external
customer-suppliedoatingcontact
3. Ext.+P/PID(P/PIDcontrolleroption):Theunitisswitchedonand
o󰀨asdescribedinitem2.ifozoneisalsorequestedsimultaneously
using the P/PID controller signal. It is then possible to use an external
signal (ext. contact) to interrupt controller operation, for example,
foralterpurge.
4. Data bus (Pronet/Probus option): The unit is switched on and
o󰀨externallyusingthedatabus.Ifafaultoccursinthedatabus
connectionatruntime,theunitisswitchedo󰀨.
Release of operation mode
The selected operating mode determines the exclusive signal source
for the “Switch on ozone” switch. For you to select an operating mode,
the release for it must already be provided on the “Ozone device: ex-
tended settings” screen. The “Panel” operating type is always available
for selection. These releases can be changed only if the device is in
the “Ready” operating state.
Release of ozone operation
The unit can be switched on only if the release is set using the “Release
ozone operation” button. The release can be cancelled on the TP at any
time independently of the “Switch on ozone” switch setting. The operator
canthereforealwaysswitcho󰀨theunitdirectlyfromtheTPevenwhen
the unit is controlled remotely. If an ozone operation fault occurs, the
release is cancelled by the controller. The operator cannot reset the
release until acknowledgment of the fault (or faults) has been given.
Ozone device: Ready/operation
“Set ozone level” operating mode
The ozone production capacity is adjustable in 16 levels. There are four
operating modes for this adjustment:
1. Panel: manually on the device
2. Proportional controller (P/PID controller option): The ozone level
is set proportionally to an external 4 to 20 mA signal. For example,
thesignalcancomefromtheowmeterofawatervolumeowinto
which the ozone is to be mixed. This operating mode facilitates ozone
metering with the addition of a virtually constant ozone amount per
m3of waterregardless ofthewatervolumeowandthat reacts
quicklytochangesinthewatervolumeow.Ifthe“Prop.controller”
operating mode is selected, the measurement signalling current is
monitored on the PLC analogue input.
3. PID controller (P/PID controller option): The ozone level is set by
the internal PID controller in accordance with an external 4 to 20 mA
measurement signal. The controller sets the ozone level so that the
measurement signal, which corresponds to the current ozone con-
centration in the water, for example, is as close as possible to the
nominal value set by the operator. This operating mode facilitates
ozone metering which keeps the ozone concentration in the water
virtually constant, regardless of the volume ow and ozone con-
sumption of the water. Ozone metering reacts only relatively slowly to
changestothevolumeowandtheozoneconsumptioninthewater.
If the “PID controller” operating mode is selected, the measurement
signalling current is monitored on the PLC analogue input.
4. Databus(Pronet/Probusoption):Theozonelevelissetexternally
using the data bus. If a fault occurs in the data bus connection at
runtime, the ozone stage is set to “0”.

EN
20
Release of operation mode
The selected operating mode determines the exclusive signal source
thatspeciestheozonelevel.Foryoutoselectanoperatingmode,the
release for it must already be provided on the “Ozone device: extended
settings” screen. The “Panel” operating type is always available for
selection. These releases can be changed only if the device is in the
“Ready” operating state.
Next screens: Ozone device: Settings, ozone device: Extended settings
Ozone device: Settings
Pre-operation purge time: The pre-operation purge time can be set in
a range of 0 to 900 seconds (= 0 to 15 minutes).
Post-operation purge time: The post-operation purge time can be set
in a range of 0 to 900 seconds (= 0 to 15 minutes).
Airow:Thesetairowforthedevicemustmatchtheairowdisplayed
ontheairowmeter(2)duringoperation.Theadjustablerangecan
be limited by the air humidity set for the dryer (see the “Dryer settings”
screen).
Minimum/maximum ozone level: Restriction for the ozone level that
can be chosen during operation. During operation, this restriction has
priority over the default ozone level setting provided by the “Set ozone
level” operating mode. For example: If the minimum ozone level is set
to > = 1, operation without ozone, i.e. level 0, is not possible.
Minimumowcoolingwater:Ifthecoolingwaterowismeteredusingan
internalowsensor,thelimitvalueformonitoringcanbespeciedhere.
Ozone application: You can enter a name for the unit application here.
This name appears on the start screen and alternates with the status
display.
Next screen: Extended settings
Ozone device: Extended settings
Release of operation mode
The operating mode for “Switch on ozone” and “Set ozone level” de-
termines the exclusive signal source for the parameter to be set. The
relevant operating mode must be released so that it can be selected on
the “Ozone device: ready/ozone generation” screen. These releases
can be changed only if the device is in the “Ready” operating state.
The “Prop. controller” and “PID controller” (optional) operating modes
can be released only if the signal module SM 1231 = analogue input
module is set on the PLC. In this case, either the “Prop. controller” or
“PID controller” operating mode can be released. In addition, for the
selected controller type, the “Ext. + P/PID” operating mode can be
released for “Switch on ozone”.
The “Databus” (optional) operating mode can be released only if the
databus connection has been activated before hand in the correspon-
ding network. The activation is highlighted in colour: green = active,
red = faulty, black = inactive, grey = not available. You carry out the
activation on the “PLC database connection” screen.
Analogue output (optional)
If the SM 1232 signal module is set for a 4 to 20 mA analogue output in
thePLC,theoutputsignalcanbeswitchedon/o󰀨.Whenthesignalis
switchedon,theoutputismonitoredforaminimumowof4mA.When
thesignalisswitchedo󰀨,thismonitoringisdeactivated.