Bosch WR 11 B Technical Document

Installation Manual and Operating Instructions
Gas Instantaneous Water Heater
WR 11/14/18 .B..
6720648592 (2014/05) ZA
Read installation manual prior to installation of this unit!
Read user manual before putting this unit in operation!
Observe the warnings in the manuals!
The installation room must fulfill the ventilation requirements!
Installation by an authorised person only!

6720648592 (2014/05)
2 | Table of contents
Table of contents
1 Key to symbols and safety instructions . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . 3
2 Technical Characteristics and Dimensions . . . . . . . 5
2.1 Declaration of conformity with relevant
EEC regulations . . . . . . . . . . . . . . . . . . . . . . .5
2.2 Explanation of Model Code . . . . . . . . . . . . . . 5
2.3 Accessories (Included with Appliance) . . . . 5
2.4 Description of the heater . . . . . . . . . . . . . . . 5
2.5 Type overview . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6 Special accessories . . . . . . . . . . . . . . . . . . . . 5
2.7 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.8 Electrical diagram . . . . . . . . . . . . . . . . . . . . . 7
2.9 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.10 Technical characteristics . . . . . . . . . . . . . . . 8
3 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Before starting up the heater . . . . . . . . . . . . 9
3.2 Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Turning the heater on and o . . . . . . . . . . . . 9
3.4 Power adjustment . . . . . . . . . . . . . . . . . . . . 10
3.5 Temperature/ow adjustment . . . . . . . . . . 10
3.6 Purge the appliance . . . . . . . . . . . . . . . . . . 10
3.7 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5 Installation (must be carried out only by
qualied technicians) . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Important information . . . . . . . . . . . . . . . . . 11
5.2 Selection of the place of installation . . . . . 11
5.3 Heater mounting . . . . . . . . . . . . . . . . . . . . . 12
5.4 Water connection . . . . . . . . . . . . . . . . . . . . 12
5.5 Gas connection . . . . . . . . . . . . . . . . . . . . . . 13
5.6 Inlet/exhaust pipe installation . . . . . . . . . . 13
5.7Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Adjustments (must be carried out only by
qualied technicians) . . . . . . . . . . . . . . . . . . . . . . . 13
6.1 Factory regulations . . . . . . . . . . . . . . . . . . . 13
6.2 Pressure adjustment . . . . . . . . . . . . . . . . . . 14
6.3 Conversion to a dierent type of gas . . . . . 15
7 Maintenance (must be carried out only by
qualied technicians) . . . . . . . . . . . . . . . . . . . . . . . .16
7.1 Periodic maintenance work . . . . . . . . . . . . 16
7.2 Startup after maintenance work . . . . . . . . 16
7.3 Flue gas safety device . . . . . . . . . . . . . . . . . 17
8 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Environment / disposal . . . . . . . . . . . . . . . . . . . . . . . 19

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Key to symbols and safety instructions | 3
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are dened and can be used in this
document:
•NOTICEindicates a situation that could result in damage to
property or equipment.
•CAUTIONindicates a situation thatcould result in minor to
medium injury.
•WARNINGindicates a situation thatcould result in severe
injury or death.
•DANGERindicates a situation that will result in severe
injury or death.
Important information
Additional symbols
1.2 Safety Instructions
If there is a smell of gas:
Close the gas valve.
Open windows.
Do not operate any electrical appliances or switches (on/
o).
Extinguish any naked ames.
Phone the gas company or an authorized technician from a
safe distance.
If there is a smell of burnt gases:
Disconnect the appliance.
Open doors and windows.
Inform an installation company.
Burn-back (re in burner tube or chamber)
In the event of a burn-back, where the ame burns back to
the injector, immediately turn o the gas supply at the
control valve on the panel.
After ensuring the ame isextinguished, wait for one
minute and re-light the appliance in the normal manner.
Should the appliance again burn back, close the control
valve and call a service technician.
Do not use the appliance again until the service technician
has declared that it is safe to do so.
Fitting, modications
The tting and modication of the installation of the
appliance must be carried out only by an authorized
technician.
The installation ofthe water heater mayonly be carried out
by a registered installer andthat such installations shall
comply with the requirements of SANS 10087-1.
The pipes carrying burnt gases must not be modied.
Do not close or reduce air circulation holes.
Maintenance
We reccomend to have the system regularly serviced in
order to ensure that it functions reliably and safely.
The installer is responsible for the safety and
environmental compatibility of the installation.
The appliance should be serviced annually.
Only original spareparts must be used.
Explosive and inammable materials
Inammable materials (paper, solvents, ink, etc.) should
not be stored near the appliance.
Combustion air and ambient air
To avoid corrosion, combustionair and ambient air should
be free of aggressive substances (for example halogenated
hydrocarbons containing chlorine and uoride
composites).
Warnings in this document are identied by
a warning triangle printed against a grey
background.
Keywords at the start of a warning indicate
the type and seriousness of the ensuing risk
if measures to prevent the risk are not taken.
This symbol indicates important information
where there is no risk to people or property.
Symbol Explanation
Step in an action sequence
Cross-reference to another part of the document
•List entry
– List entry (second level)
Table 1

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4 | Key to symbols and safety instructions
Important information for the user
This appliance may only be installed by a registered LP Gas
installer.
All registered installers are issued with a card carrying their
registration number.
Ask to be shown the card before allowing the installation
work to commence and make anote of the Installer QCC
number. Upon completion of the installation, the installer is
required to explain the operational details of the appliance
together with the safety instructions. You will be asked to
sign acceptance of the installation and be provided with a
completion certicate. You should only sign for acceptance
of the installation whenthe installationis completed to your
satisfaction.Note that your invoice is required in the event
that you wish make a guarantee claim.
Important information for the installer
This appliance may only be installed by a LP gas installer
registered with the Liqueed Petroleum Gas Association of
Southern Africa.
The appliance must be installed in accordance with the
requirements of SANS 10087-1 and any re department
regulations and/or local by lawsapplicable to the area. If in
doubt check with the relevant authority before undertaking
the installation.
Upon completion of the installation you are required to fully
explain and demonstrate to theuser the operational details
and safety practices applicable to the appliance and the
installation.
Client information
Inform the client about the function and operation of the
appliance.
Caution clients against performing modications or repairs
themselves.
Risk of damage dueto operator error
Operator errors can result in injury and damage to property.
Ensure that children never operate this appliance
unsupervised or play with it.
Ensure that only personnel who can operate this appliance
correctly have access to it.

6720648592 (2014/05)
Technical Characteristics and Dimensions | 5
2 Technical Characteristics and Dimensions
2.1 Declaration of conformity with relevant EEC
regulations
This appliance fullls European directive requirements 2009/
142/EC, 2006/95/EC, 2004/108/EC and corresponds to the
specications described in the corresponding EEC certicate
of proof.
2.2 Explanation of Model Code
[W] Gas Water Heater
[R] Proportional power adjustment
[11] Capacity (l/min)
[B] Electronic ignition powered by 1.5 V batteries
[23] Indicator number of natural gas H
[31] Indicator number of LPG
[S...] Country code
The code number indicates the gas group according to EN 437:
2.3 Accessories (Included with Appliance)
•Gas water heater,
•Attachment elements,
•Installation accessories,
•Two 1.5 V batteries type R
•Heater documentation.
2.4 Description of the heater
Operating convenience, as the heater is ready to operate by
simply pressing a switch.
•Heater for wall-mounting,
•Ignition by electronic devicetriggered when the water valve
opens,
•Great savings in comparisonwith conventional heaters,
due to the possibility of power adjustment and no
permanent pilot ame,
•Natural gas/LPG burner,
•Semi-permanent pilot burner which only functions during
the period between the opening of the water valve and the
ignition of the main burner,
•Heat exchanger in copperwithout tin/lead covering,
•Water valve in breglass-reinforced polyamide, 100%
recyclable,
•Automatic adjustment of the water ow by means of a
device which permits a constant ow to be maintained in
spite of variable pressure supplies,
•Gas ow adjustment proportional to the water ow to
maintain a constant high temperature.
•Safety devices:
– Ionisation probe to check for accidental extinction of
the burner ame,
– Flue gas safety device whichturns o the heater in case
of inadequate combusted gas evacuation conditions,
– Temperature limiter which prevents overheating of the
heat exchanger.
2.5 Type overview
The type plate is located at the bottom left of the appliance.
There you will nd details ofappliance output, model number,
approval data and the serial number.
2.6 Special accessories
•Conversion kit from natural gas to butane/propane.
Model WR 11/14/18 B...
Category II2H3+
Type Type B
Table 2
WR 11 B 23
31
S....
WR 14 B 23
31
S....
WR 18 B 23
31
S....
Table 3
Identication
Code
Wobbe Index (Ws)
(15 °C) Gas type
23 12,7-15,2 kWh/m3Natural Gas - Group H
31 20,2-21,3 kWh/m3LPG - Group B/P
Table 4

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6 | Technical Characteristics and Dimensions
2.7 Dimensions
Fig. 1
[1] Front cover
[2] Hole for xing to wall
[3] Temperature control
[4] Led indicator for battery charge level
[5] ON/OFF switch
[6] Led indicator for burner status
[7] Output control
[8] Gas connection
[9] Flue socket
[10] Draught diverter with ue gas monitor
[11] Heat exchanger
[12] Automatic gas valve
[13] Igniter unit
[14] Battery compartment
Dimensions (mm) A B C D E F G
H (Ø)
Natural
gas LPG
WR11B 310 580 228 112,5 463 60 25 1/2” 1/2”
WR14B 350 655 228 132,5 510 95 30 1/2” 1/2”
WR18B 425 655 334 132,5 540 65 30 1/2” 1/2”
Table 5 Dimensions

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Technical Characteristics and Dimensions | 7
2.8 Electrical diagram
Fig. 2 Electrical diagram
[1] Servo valve (normally open)
[2] Diaphragm valve
[3] Main valve (normally closed)
[4] Ionisation detector
[5] Igniter electrode
[6] Flue gas safety device
[7] Temperature limiter
[8] Igniter unit
[9] LED indicator for battery charge level
[10] LED indicator for burner status
[11] ON/OFF switch
[12] Batteries, 1.5V
[13] Microswitch
2.9 Function
This gas heater is equipped withautomatic electronic ignition
which simplies its operation.
To do so, just turn on the switch (Fig. 5).
After this procedure, automaticignition occurs whenever a hot
water tap is opened. First, the pilot burner is lit and
approximately four seconds afterwards the main burner. The
pilot burner ame is then extinguished after a short period of
time.
This is a way of saving a greatamount of energy as the pilot
burner only operates for the minimum necessary time to ignite
the main burner, in contrastto conventional systems which
operate permanently.
If this happens:
Close and open the hot watertap to repeat the ignition
process until all the air has been purged.
Air in the gas supply pipe when the heater is
started up may cause ignition to fail.

6720648592 (2014/05)
8 | Technical Characteristics and Dimensions
2.10 Technical characteristics
Technical characteristics Symbol Units WR11 WR14 WR18
Power and ow
nPrewoplufesulanimoN Btu/h 65570 80595 104165
nimPrewoplufesumuminiM Btu/h 23905 23905 23905
Useful power (adjustment range) Btu/h 23905-
65570
23905 -
80595
23905 -
104165
nQwolflamrehtlanimoN Btu/h 74450 92210 117825
nimQwolflamrehtmuminiM Btu/h 27660 27660 27660
Gas data1)
1) Hi 15 °C - 1013 mbar - dry: Natural gas 34.02 MJ/m
3(9.5 kWh/m 3)
LPG: Butane 45.65 MJ/kg (12.7 kWh/kg) - Propane 46.34 MJ/kg (12.9 kWh/kg)
Supply pressure
02GHsaglarutaN kPa 2 2 2
03G)enaporP/enatuB(GPL kPa 2,8 2,8 2,8
Consumption
02GHsaglarutaN m3/h2,2 2,77 3,5
03G)enaporP/enatuB(GPL Kg/h 1,75 2,2 2,79
Number of injectors 12 14 18
Water data
Maximum permissible pressure
2)
2) Considering the water dilution eectthis value must not be exceeded.
pw psi 170 170 170
Temperature selector in fully clockwise position
Temperature rise °C 50 50 50
Flow range l/min 2 - 5,5 2,0 - 7 2,0 - 8,8
nimwperusserpgnitarepomuminiM psi 1,5 1,5 3,0
Minimum pressure for maximum water ow psi 3,6 5,0 7,2
Temperature selector in fully anti-clockwise position
Temperature rise °C 25 25 25
Flow range l/min 4 - 11 4 - 14 4 - 17,6
Minimum pressure for maximum water ow psi 8,7 14,5 19
Combustion products
3)
3) For nominal caloric power.
Minimum low pressure mbar 0,015 0,015 0,015
Flow g/s 13 17 22
Temperature °C 160 170 180
Table 6

6720648592 (2014/05)
Use | 9
3 Use
3.1 Before starting up the heater
Check if the gas indicated on the rating plate is the same as
the one used at the location.
Open the gas valve.
Open the water valve.
3.2 Batteries
Battery insertion
Insert the two 1.5 V R20 batteries.
Fig. 3 Inserting the batteries
Replacing the batteries
The batteries must be changed ifthe red LED starts ashing.
Fig. 4 Replacing the batteries
Precautions when using the batteries
•Do not dispose of batteries asdomestic waste. Take them
to appropriate collecting places for recycling.
•Do not insert at batteries.
•Only use the type of batteries indicated.
3.3 Turning the heater on and o
Turning on
Press the switch , position .
Fig. 5
Green light on = Main burner on
Open all water and gas blocking devices.
Purge the pipes.
CAUTION:
The front panel in the burner and pilot burner
area may reach high temperatures, with risk of
burning in case of contact
CAUTION:
Initial startup must be performed by a
qualied technician who will provide the
client with all the necessary information
for optimum operation of the gas heater.
6720680412-01.1av
6720680412-02.1av

6720648592 (2014/05)
10 | Use
Fig. 6
Turning o
Press the switch , position .
3.4 Power adjustment
Lower water temperature.
Less power.
Fig. 7
Higher water temperature.
More power.
Fig. 8
3.5 Temperature/ow adjustment
Turn anti-clockwise
Increases ow and decreases water temperature.
Fig. 9
Turn clockwise.
Decreases ow and increases water temperature.
Regulating the temperature tothe minimum required value
reduces energy consumption as well as the possibility of
limescale deposits inthe heat exchanger.
3.6 Purge the appliance
If there is a risk of freezing, proceed as follows:
Remove the retaining clip from threaded bushing (Fig. 10,
[1]).
Remove threaded bushing (Fig. 10,[2]) from water valve.
6720680412-03.1av

6720648592 (2014/05)
Regulation | 11
Empty the appliance of all water.
Fig. 10 Purge
[1] Retaining clip
[2] Threaded bushing
3.7 Cleaning
Clean the front cover usinga damp cloth and detergent.
4 Regulation
Any local by-laws and regulations pertaining to installation and
use of gas-heated appliances must be observed. Please refer to
the laws that should be attended in South Africa.
5 Installation (must becarried out only by
qualied technicians)
5.1 Important information
Before installing, call the gas company and check the
standard relating to gas heaters and ventilation
requirements for rooms.
Install a gas cut-o valve as close as possible to the heater.
After nishing the gas system, the pipes must be
thoroughly cleaned and leak-tested; to avoid damaging the
gas valve by excess pressure, this test must be performed
with the gas valve of the heater closed.
Check if the heater corresponds to the type of gas
provided.
Check if the ow and pressure through the installed
reducer are appropriate for the consumption of the heater
(see technical data in the table 4).
5.2 Selection of theplace of installation
Requirements regarding the place of installation
•Do not install the heater in rooms with a volume of less than
8 m3(not including the volume of the furniture providing
this does not exceed 2 m
3.
•Comply with the specic instructions for each country.
•Assemble the gas heater in a well-ventilated location where
it will not be exposed to temperatures below zero and in a
place where there is an evacuation pipe for combustion
gases.
•The gas heater must not beinstalled over a heat source.
•To avoid corrosion, the combustion air must be free from
harmful substances. Examples of particularly corrosive
substances: halogenated hydrocarbons contained in
solvents, paints, glues, enginegases and various domestic
detergents. If necessary,take adequate measures.
•Respect the minimum installation clearances indicated in
Fig.11.
•The heater must not be installed in locations where the
room temperature can reach 0 °C.
In case of a frost risk:
Turn o the heater,
Remove batteries,
Purge the heater (section 3.6).
Do not use abrasive or corrosive cleaners.
DANGER: Explosion!
Always turn o the gas cock before
carrying out any work on components
which carry gas.
Installation, electrical connection, gas
installation, connection of inlet and exhaust
pipes and initial of the water heater may only be
carried out by a registered installer and that
such installations shall comply with the
requirements of SANS 10087-1.
6720617434-02.1Av
2
1
The appliance can only besold in the countries
mentioned in the type plate.

6720648592 (2014/05)
12 | Installation (must be carried out only by qualied technicians)
Fig. 11 Minimum clearances
Combustion gases
•All gas heaters must be connected in a leak-roof manner to
a gas evacuation pipe of adequate dimensions.
•The ue must:
– be vertical (reduced horizontal sections or no
horizontal sections at all)
– be thermally insulated
– have an exit above the maximum roof level.
•The combustion gases evacuation pipe must be inserted in
the ue ring. The external diameter of the pipe must be
slightly less than the diameter of the ue indicated in the
table of heater dimensions.
•The extremity of the evacuation pipe must be protected
against wind/rain.
If these conditions cannot be met, a dierent location must be
selected for the gas intake and evacuation.
Surface temperature
The maximum surface temperature of the heater is less than
85 °C, with the exception of the combustion gases evacuation
device. No special protection measures are required for
ammable construction materials or built-in furniture items.
Air intake
The place where the heater is to be installed must have an area
of air supply according to the table.
The minimum requirements are listed above; however, each
country's specied requirements must also be respected.
5.3 Heater mounting
Remove the temperature/ow selector and the power
selector.
Unscrew the front xing screws.
With a simultaneous movementtowardsyou and upwards,
release the front of the two lugs from the back.
Fix the heater vertically, using the provided screw hooks
and plugs.
5.4 Water connection
It is advisable to purge the installation beforehand, because the
presence of dirt may reduce the ow and, in extreme cases,
cause a blockage.
Identify the cold water pipe (Fig. 12, item A) and the hot
water pipe (Fig. 12, item B), so as to avoid any possible
mis-connection.
DANGER:
Make sure that all ueconnections are tighten
sealed.
Failure to follow this requirement may
cause dangerous exhaust gases to enter
living space which may result causing
personal injury or loss of life.
CAUTION:
Ensure that the extremity of the evacuation
pipe is placed between the ledge and the ring
of the ue.
h
3
3 3
40
L
L (m) h (cm)
0 - 1 3
1 - 2 6
2 - 3 9
3 - 4 24
6720607539-02.6Av
180
30
140
100
Heater Minimum useful area
WR11B 60 cm2
WR14B 90 cm2
WR18B 120 cm2
Table 7 Useful areas for air intake
CAUTION:
Never support the gas heater on the water or
gas connections.

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Adjustments (must be carried out only by qualied technicians) | 13
Connect the water pipes tothe water valve using the
provided connection accessories.
Fig. 12 Water connection
5.5 Gas connection
Gas pressure regulator
This appliance requires an operating pressure of 2,8 kPa at the
appliance. A suitable LPG regulator that complies with the
requirements of SANS 1237 must be installed.
Any local by-laws and regulations pertaining to installation and
use of gas-heated appliances must be observed.
Please refer to thelaws that should be attended in your
country.
5.6 Inlet/exhaust pipe installation
Pipes should be installed according to the instructions in the
relevant manual.
Once connected, the pipe shouldbe inspected and the seal
guaranteed.
5.7 Startup
Open the water and gas owvalves and check that all
connections are leak-tight.
Check the ue gas safety device is functioning correctly,
proceed as explained in “Section 7.3 Combustion gas
probe”.
6 Adjustments(must be carried out only by
qualied technicians)
6.1 Factory regulations
Natural gas
Heaters designed for Natural gasH (G 20) are factory sealed for
delivery after the values on thecharacteristics panel have been
checked.
Liquid gas
Propane/butane heaters (G31/G30) are factory sealed for
delivery after the values on thecharacteristics panel have been
checked.
It is advisable to installa non-return valve on the
supply side of the heater to avoid problems
caused by sudden changes in supply pressure.
DANGER:
If local regulations are not follow exactly, a re
or explosion may result causing property
damage, personal injury or loss of life.
Only use accessories recommended in this
manual.
DANGER: Make sure that all ue connections
are tighten sealed.
Failure to follow this requirement may
cause dangerous exhaust gases to enter
living space which may result causing
personal injury or loss of life.
Sealed parts must not be interfered with.
Heaters should not be ignited when the
connections pressure is less than 1,7 kPa more
than 2,5 kPa.
Heaters should not be ignited when the
connections pressure is:
- Propane: less than 2,5 kPa more than 4,5 kPa.
- Butane: less than 2,0 mbar more than 3,5 kPa.

6720648592 (2014/05)
14 | Adjustments (must be carried out only by qualied technicians)
Power may be tuned according to the burner pressure process,
for which a manometer with U-shaped connecting tubes is
required.
6.2 Pressure adjustment
Accessing the adjusting screw
Remove the front part of the heater (section 5.3).
Connecting the pressure gauge
Unscrew the shut-o screw.
Connect the pressure gauge to the measuring point for the
burner pressure.
Fig. 13 Pressure measurement points
Maximum gas ow adjustment
Remove the screw seal (Fig. 14).
Turn on the heater with the power selector set to the left
(maximum position).
Fig. 14 Maximum gas ow adjusting screw
Open various hot water taps.
Using the adjusting screw,regulate the pressure until
obtaining the values indicated in the table 8.
Seal the adjusting screw once again.
6720607418-01.3V
6720607418-02 2V

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Adjustments (must be carried out only by qualied technicians) | 15
Minimum gas ow adjustment
6.3 Conversion to a dierent type of gas
Only use theoriginal conversion kits.
The conversion must only beperformed by a qualied
technician. The original conversion kits are supplied with
assembly instructions.
The minimum gas ow adjustment is performed
automatically after the adjustment of the
maximum gas ow.
Natural gas H Butane Propane
Injector code
WR11
8708202113
(1,10)
8708202130
(0,70)
8708202124
(1,20)
8708202128
(0,72)
WR14
8708202113
(1,10)
8708202128
(0,72)
8708202116
(1,25)
8708202132
(0,75)
WR18
8708202115
(1,15)
8708202130
(0,70)
8708202116
(1,25)
8708202132
(0,75)
Connection
pressure
(psi)
WR11
WR14
WR18
32 3
MAX (psi)
WR11 8,272,1 3,5
WR14 8,22,1 3,5
WR18 55,230,1 3,25
Table 8 Burner pressure

6720648592 (2014/05)
16 | Maintenance (must be carried out only by qualied technicians)
7 Maintenance (must be carried out only by qualied technicians)
To ensure that gas consumption and the environmental load
(pollution, etc.) remain as negligible as possible over a longer
period of time, we recommend that you assure to have the
appliance maintained on an annual basis (inspection) or if
necessary (maintenance).
These jobs can only be done by a Bosch Technical Assistance
delegate.
Only use original spare parts.
Order the spare parts according to the spare parts
catalogue for the heater.
Replace the joints and removed O-rings with new ones.
Only the following lubricants must be used:
– Hydraulic part: Unisilikon L 641 (8 709 918 413)
– Threaded joints: HFt 1 v 5 (8 709 918 010).
7.1 Periodic maintenance work
Functional check
Check the operation of all safety, adjustment and
monitoring elements.
Heat exchanger
Check the heat exchanger is clean.
In case of dirt:
– Remove the heat exchangerand take out the limiter.
– Clean the chamber with a powerful jet of water.
If dirt persists: Soak the plates in hot water with detergent
and clean thoroughly.
If necessary: De-lime the interior of the heat exchanger and
the connection pipes.
Install the heat exchanger using new joints.
Install the limiter on the support.
Burner
Check the burner annually and clean it if necessary.
If it is very dirty (grease, soot): Remove the burner, soak it
in hot water with detergent and clean it thoroughly.
Water lter
Replace the water lter installed in the water valve entry.
Burner and pilot injector
Remove and clean the pilot burner.
Remove and clean the pilot injector.
7.2 Startup after maintenance work
Tighten all connections once more.
Read chapter 3 “Use” and chapter 6 “Adjustments”.
DANGER:
Explosion!
Always turn o the gas cock before
carrying out any work on components
which carry gas.
CAUTION:Leaking water may damage the
appliance!
Always empty the system before
disassembly of any hydraulic system part.
WARNING:
Is forbidden to start up the appliance without
water lter correctly assembled.

6720648592 (2014/05)
Maintenance (must be carried out only by qualied technicians) | 17
7.3 Flue gas safety device
Operation and safety precautions
The ue gas safety device checks the eectiveness of ue gas
extraction by the ue. If it is inadequate, the appliance switches
o automatically so that the combustion fumes do not escape
into the room in which the appliance has been installed. The
ue gas safety device resets after a cooling-down period.
If the appliance shuts down while in operation:
Ventilate the room.
Wait about 10 minutes then restart the appliance.
If the problem recurs, call an engineer.
Maintenance
If faults occur on the ue gassafety device, proceed as follows:
Undo ue gas safetydevice xing screw.
Loosen temperature limiters connectors.
Undo magnetic unit connector.
Remove thermocouple.
Replace damaged component with new one and ret using
the reverse of the procedure set out in the table above.
Function check
Flue gas safety device function check:
Disconnect ue pipe;
Replace with pipe (about 50 cm long) with sealed end;
Fit pipe vertically;
Start up appliance at rated output and set temperature
control to maximum temperature;
Under those conditions, the appliance should shut down
after two minutes. Remove temporary pipe and reconnect
ue pipe.
DANGER:
The ue gas safety device must not under any
circumstances be switched o, simulated or
replaced by any other component.
DANGER:
The user must never make any modications
to the ue gas safety device.

6720648592 (2014/05)
18 | Problems
8 Problems
Assembly, maintenance and repairs must be performed by qualified technicians only. The following chart oers solutions to
possible problems (solutions followed by an * must be undertaken by qualied technicians only).
Problem Cause Solution
The heater does not ignite.
Slow and dicult ignition of the
burner.
Red LED in switch ashes.
Switch turned o.
Reduced water ow.
Flat batteries.
Check switch position.
Check and correct.
Replace batteries.
Water at low temperature. Check the temperature selector position and
adjust it accordingto the desired water
temperature.
Water is not heated, no ame. Insucient gas supply. Check reducer, and if inadequate or
malfunctioning, replace it.
Check if the bottles (butane) freeze during
operation, and if so, move them to a warmer
place.
The burner turns o the heater is
operating.
Temperature limiter has tripped.
Flue gas safety device has tripped.
Wait 10 minutes and restart the heater. If the
problem persists, call a qualied technician.
Vent the area. Wait 10 minutes and restart the
heater. If the problem persists, call a qualied
technician.
There is spark but the main burner
does not ignite.
No ionisation probe signal. Check:
•Gas supply,
•Ignition system (ionisation electrode and
electrovalves).
Reduced water ow. Insucient water supply pressure.
Dirty taps or mixers.
Gas valve blocked.
Heat exchanger blocked
(limescale).
Check and correct. *
Check and clean.
Clean lter.*
Clean and de-lime if necessary.*
Table 9

6720648592 (2014/05)
Environment / disposal | 19
9 Environment / disposal
Environmental protection is a fundamental corporate strategy
of the Bosch Group.
The quality of our products, their eciency and environmental
safety are all of equal importance to us and all environmental
protection legislation and regulations are strictly observed.
We use the best possible technology and materials for
protecting the environment taking into account of economic
considerations.
Packaging
We participate in the recycling programmes of the countries in
which our products are sold to ensure optimum recycling.
All of our packaging materials are environmentally friendly and
can be recycled.
Used appliances
Used appliances contain valuable materials that should be
recycled.
The various assemblies can be easily dismantled and synthetic
materials are marked accordingly. Assemblies can therefore be
sorted by composition and passed on for recycling or disposal.

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