Bosch Gaz 6000 W User manual

6720866248 (2019/07) EG/TN/DZ/MA/JO/IQ/SY/LB
Operating instructions
Wall mounted gas boiler
Gaz 6000 W
0 010 010 989-001
WBN 6000-24/28/35 CR/HR N/L

Table of contents
Gaz 6000 W – 6720866248 (2019/07)
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Table of contents 1 Explanation of symbols and safety instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimising danger are not taken.
The following signal words are defined and can be used in this document:
DANGER:
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING:
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION:
CAUTION indicates that minor to medium personal injury may occur.
NOTICE:
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is no risk to
people or property.
Additional symbols
Table 1
1.2 General safety instructions
HNotices for the target group
These operating instructions are intended for the
heating system operator.
All instructions must be observed. Failure to comply
with instructions may result in material damage and
personal injury, including danger to life.
▶ Read and retain the operating instructions
(heat source, heating controller, etc.)
prior to operation.
▶ Observe the safety instructions and warnings.
1 Explanation of symbols and safety instructions . . . . . . . . . . . 2
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 2
2 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Type overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Prepare for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Opening service valves . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Checking the operating pressure of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Topping up heating water . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Operating the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Control panel overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Switching on the device. . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Setting the flow temperature. . . . . . . . . . . . . . . . . . . . . . 6
4.4 Setting the DHW heating . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.4.1 Adjust the domestic hot water temperature. . . . . . . . . . 6
4.5 Setting summer mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1 Switching off/standby mode . . . . . . . . . . . . . . . . . . . . . . 6
5.2 Setting frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Thermal disinfection (WBN 6000-.. HR only) . . . . . . . . . . . . . 7
7 Tips on energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
10 Environmental protection and disposal . . . . . . . . . . . . . . . . . . 8
11 Technical terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Symbol Meaning
▶ a step in an action sequence
a reference to a related part in the document
• a list entry
– a list entry (second level)

Explanation of symbols and safety instructions
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Gaz 6000 W – 6720866248 (2019/07)
HDetermined use
The product may only be used for the heating of boiler
water and for DHW heating.
Any other use is considered inappropriate.
We assume no liability for damage occurring due to
non-permitted use.
HIf you smell gas
A gas leak could potentially cause an explosion. If you
smell gas, observe the following rules.
▶ Prevent flames or sparks:
– Do not smoke, do not use a lighter or strike
matches.
– Do not operate any electrical switches or unplug
any equipment.
– Do not use the telephone or ring doorbells.
▶ Turn off the gas supply at the main shut-off valve or
at the gas meter.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Move well away from the building: call the
emergency services and the gas supplier.
HDanger to life from poisoning by flue gas
There is a danger to life from escaping flue gas.
▶Never modify any parts through which flue gas is
routed.
If flues are damaged or leaking, or if you smell flue gas,
observe the following rules.
▶ Switch off the heat source.
▶ Open doors and windows
▶ Warn your neighbours and leave the building
immediately.
▶ Prevent third parties from entering the building.
▶ Notify an approved contractor.
▶ Have any defects rectified.
HDanger to life from carbon monoxide
Carbon monoxide (CO) is a poisonous gas, which
arises during the incomplete combustion of fossil fuels
such as oil, gas or solid fuels.
Dangers arise, if carbon monoxide escapes from the
heating system due to a fault or a leak and collects
unnoticed in enclosed spaces.
You can neither see, taste nor smell carbon monoxide.
To avoid danger from carbon monoxide:
▶ Have the heating system inspected and serviced
regularly by an approved contractor.
▶ Use a CO detector, which gives an alarm in good
time if CO escapes.
▶ If you suspect a CO leak:
– Warn your neighbours and leave the building
immediately.
– Call an approved contractor.
– Have any defects rectified.
HInspection, cleaning and maintenance
The user is responsible for ensuring the heating
system is safe and environmentally compatible.
Non-existent or improper inspection, cleaning and
maintenance may result in personal injury, including
danger to life or material damage.
We recommend that you enter into a contract covering
an annual inspection and responsive cleaning and
maintenance with an approved contractor.
▶ Have work carried out only by an approved
contractor.
▶ Have the heating system inspected by an approved
contractor at least once a year.
▶ Have any required cleaning or maintenance work
carried out immediately.
▶ Have any defects in the heating system remedied
immediately, independent of the annual inspection.
HConversion and repairs
Improper modifications to the heat source or other
parts of the heating system can result in personal
injury and/or material damage.
▶ Have work carried out only by an approved
contractor.
▶ Never remove the casing of the heat source.
▶ Never carry out any modifications to the heat
source or to other parts of the heating system.
▶ Never close the outlet of the pressure relief valves.
Heating systems with DHW cylinder: During heat-
up, water can escape from the pressure relief valve
of the DHW cylinder.

Product Information
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HOpen flue operation
The installation location must be adequately
ventilated, if the heat source draws its combustion air
from the room.
▶ Never cover or reduce the size of ventilation
openings in doors, windows and walls.
▶ Consult a contractor to ensure that ventilation
requirements are met:
– If structural modifications are made
(e.g. replacing windows and doors)
– If devices with an air discharge to the outside are
subsequently installed (e.g. extractor fans,
kitchen fans or air conditioning units).
HCombustion air/ambient air
The air in the installation location must be free of
flammable or chemically aggressive substances.
▶ Do not store or use any flammable or explosive
materials (paper, petrol, thinners, paints, etc.) in
the vicinity of the heat source.
▶ Do not store or use any corrosive substances
(solvents, adhesives, chlorinated cleaning agents,
etc.) in the vicinity of the heat source.
HSafety of electrical devices for domestic use
and similar purposes
The following requirements apply in accordance with
EN 60335-1 in order to prevent hazards from
occurring when using electrical appliances:
“This appliance can be used by children of 8 years and
older, as well as by people with reduced physical,
sensory or mental capabilities or lacking in experience
and knowledge, if they are supervised and have been
given instruction in the safe use of the appliance and
understand the resulting dangers. Children shall not
play with the appliance. Cleaning and user
maintenance must not be performed by children
without supervision.”
“If the power cable is damaged, it must be replaced by
the manufacturer, its customer service department or
a similarly qualified person, so that risks are avoided.”
HSafety of electrical devices for domestic use
and similar purposes
The following requirements apply in order to prevent
hazards when using electrical devices:
“If the power cable is damaged, it must be replaced by
the manufacturer, its customer service department or
a similarly qualified person, so that risks are avoided.”
2 Product Information
2.1 Declaration of Conformity
The design and operation of this product comply with European
Directives and the supplementary national requirements. Conformity
has been demonstrated by the CE marking.
You can ask for a copy of the declaration of conformity for this product.
For this see the contact address on the back cover of these instructions.
2.2 Type overview
WBN 6000-.. CR appliances are combi boilers for central and DHW
heating according to the instantaneous water heating principle.
WBN 6000-.. HR appliances are appliances for central heating and
DHW heating, fitted with a heating circuit pump and 3-way valve for the
connection of an indirectly heated cylinder.
3 Prepare for operation
Fig. 1 Connections on the gas and water side (accessories)
[1] Drain hose
[2] Heating return valve (accessory)
[3] Cold water valve (accessory)
[4] Gas isolator (closed) (accessory)
[5] Domestic hot water
[6] Heating flow valve (accessory)
3.1 Opening service valves
▶ Push the handle down and turn to the left up to the catch (handle in
flow direction = open).
Fig. 2 Opening service valves
2
34
5
6
1
0 010 005 715-001
0 010 005 716-001
2.
1.

Operating the appliance
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Gaz 6000 W – 6720866248 (2019/07)
3.2 Checking the operating pressure of the heating system
The operating pressure is generally 1 to 2 bar. For the optimum
operating pressure for your heating system, refer to your contractor.
▶ Read the operating pressure from the pressure gauge.
▶ If the pressure is too low, top up the heating water.
Fig. 3 Pressure gauge for checking the operating pressure
3.3 Topping up heating water
NOTICE:
Damage to appliance due to cold water!
Stress cracks can occur on the hot heat exchanger when the heating
water is topped up.
▶ Only top up with heating water when the appliance is in a cold state.
The filling facility is located at the bottom of the appliance between the
connection for the heating flow and the DHW connection.
The maximum pressure of 3 bar may not be exceeded even at the
maximum heating water temperature. If the maximum operating
pressure is exceeded, the pressure relief valve opens until the operating
pressure is within the normal range.
Fig. 4
▶ Open the filling valve and fill the heating system until a pressure
between 1 and 2 bar is indicated on the pressure gauge.
▶ Close the filling valve.
4 Operating the appliance
These operating instructions describe the operation of the heating
appliance. Depending on the user interface that is used, the operation of
several functions may be different from this description. Therefore
please also observe the operating instructions for the user interface.
The following user interfaces can be used:
• User interface fitted externally, for weather-compensated control
• User interface for room temperature-dependent control
▶ Set the user interface in accordance with the appropriate operating
instructions.
Fig. 5 User interface (example showing)
4.1 Control panel overview
Fig. 6 Display readings
[1] Kkey
[2] Burner operation
[3] Error display
[4] Heating mode
[5] DHW heating
[6] Service mode
[7] Temperature display (in °C)
[8] – key
[9] Press
[10] +key
[11] Press (reset)
4.2 Switching on the device
▶ Switch on the device with the Kkey.
The display shows the heating water flow temperature.
0 010 005 717-001
2
31
4
bar
0
0 010 005 718-001
0 010 002 699-002
0 010 011 141-001
1
11
9
8
43
25 6 7
10

Shutdown
Gaz 6000 W – 6720866248 (2019/07)
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4.3 Setting the flow temperature
The maximum flow temperature can be set between 40 °C and
approx. 82 °C. The current flow temperature is shown on the display.
▶Press key.
The set maximum flow temperature is displayed.
▶Press+key or – to set the required maximum flow temperature.
The setting is stored after 3 seconds. The display shows the current
flow temperature.
You can find typical maximum flow temperatures inTab. 2.
Heating mode is blocked in summer mode (on the display appears ).
If the burner is active in heating mode, the following symbols appear
and on the display.
Table 2 Maximum flow temperature
4.4 Setting the DHW heating
4.4.1 Adjust the domestic hot water temperature
The DHW temperature can be set between 35 °C and 60 °C.
▶Press key.
The set DHW temperature is displayed.
▶Press+key or – to set the required DHW temperature
The setting is stored after 3 seconds. The display shows the current
flow temperature.
When the burner is active in DHW mode, the symbols appear and
on the display.
WBN 6000-.. CR appliances: measures for hard water
To protect against increased limescale and resulting service work:
In hard water with a hard hardness range (≥ 15°dH / 27°fH/2.7 mmol/l)
▶ Set the DHW temperature to less than 55 °C.
4.5 Setting summer mode
The heating pump and consequently central heating are switched off.
The DHW and power supply for the heating control device and timer are
retained.
NOTICE:
Heating system at risk through frost.
In summer mode, only the device is protected against frost.
▶ Observe frost protection measures where there is a risk of frost
(Chapter 5.2).
To activate summer mode:
▶Press key.
▶Press– key until on the display appears.
The setting is stored after 3 seconds. The display permanently shows
.
For further information, see the heating controller operating
instructions.
5 Shutdown
5.1 Switching off/standby mode
The device has an anti-seizing function which prevents the heating pump
and the 3-way valve seizing up following long periods of inactivity.
The anti-seizing function remains active during standby mode.
▶ Switch off the device with the Kkey.
The display shows only the symbols and .
▶ If the device is taken out of operation for a long period: Bear in mind
frost protection (chapter 5.2).
5.2 Setting frost protection
NOTICE:
Risk of damage to the system from frost!
The heating system can freeze up after a prolonged period (e.g. during a
power failure, switching off the power supply, faulty fuel supply, boiler
fault etc.).
▶ Ensure that the heating system is in constant use (particularly when
there is a risk of frost).
Frost protection for the heating system:
Frost protection for the heating system is only ensured if the heating
circuit pump is operational and is pumping heating water through the
entire system.
▶ Leave the heating switched on.
▶ Set the maximum flow temperature to at least 40 °C (chapter 4.3 ).
-or- If you want to leave the appliance switched off:
▶ Ask your heating contractor to mix antifreeze (see installation
instructions) into the heating water and drain the DHW circuit.
For further information, see the heating controller operating
instructions.
Device frost protection:
The device frost protection function switches the burner and
heating pump on when the temperature in the installation room
(at temperature sensor for heating flow) falls below 5 °C.
This prevents the boiler freezing up.
▶ Activate summer mode (chapter 4.5) or set the device to standby
mode (chapter 5.1).
NOTICE:
Heating system at risk through frost.
In summer/standby mode, only the device is protected against frost.
Frost protection with OpenTherm controllers:
▶ In order to protect the heating system against frost, adjust the
controller to a minimal setback temperature of 10 °C.
The controller must not be switched off or set to stand by.
Flow temperature Sample application
(Symbol appears) Summer mode
approx. 75 °C Radiator heating system
approx. 82 °C Convector heating system

Thermal disinfection (WBN 6000-.. HR only)
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Gaz 6000 W – 6720866248 (2019/07)
6 Thermal disinfection (WBN 6000-.. HR only)
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes.
Alternately, you can have a contractor carry out thermal disinfection.
7 Tips on energy saving
Economy heating
The device is designed for low energy consumption and low environment
pollution but with a high degree of comfort. The fuel supply to the burner
is regulated according to the heat energy demand of the home. If the heat
energy demand is lower, the device continues to operate with a small
flame. Contractors refer to this process as modulating control. The
modulating control keeps the temperature fluctuations low and
distributes heat uniformly inside the rooms. This may mean that
although the device is in operation for a longer period of time, it actually
consumes less fuel than a device that is constantly being switched on
and off.
Heating controls
To optimise the performance of the heating system, we recommend
using a room temperature-dependent controller or weather-
compensated control unit and thermostatic valves as heating controls.
Thermostats
Fully open the thermostatic valves to reach the required room
temperature. Increase the required room temperature at the control unit
if the temperature is not reached after a prolonged period.
Underfloor heating
Never set the flow temperature higher than the maximum flow
temperature recommended by the manufacturer. We recommend using
a weather-compensated control unit.
Ventilating
Close the thermostatic valves when ventilating, and fully open the
windows for a short time. Never leave windows slightly open during
ventilation. Otherwise heat will always be drawn out of the room without
noticeably improving the ambient air.
Hot water
Always set the DHW temperature as low as possible. Choosing a low
setting at the temperature controller means significant energy savings.
In addition, high DHW temperatures result in increased calcification and
thus impair the function of the device (e.g. longer heat-up times or lower
draw-off volume).
DHW circulation pump
Set the DHW circulation pump, if installed, using a time program which is
customised to suit your individual requirements (such as morning,
midday or evening).
8 Troubleshooting
The electronics monitors all safety and control components. If a fault
occurs during operation, the display shows the Hsymbol and, in
certain cases, the !symbol, and a fault code (e.g. EA) flashes.
If Hand !appear:
▶ Press key and hold it until the Hand !symbols are no longer
displayed.
The device goes back into operation and the flow temperature is
displayed.
If only Happears:
▶ Switch the device off and on again with the Kkey. The device goes
back into operation and the flow temperature is displayed.
If a fault persists:
▶ Call an approved contractor or Customer service and notify them of
the fault code and details of the device.
An overview of the display readings can be found on page 5.
Table 3 Data on the device to be forwarded in the event of a fault
9 Maintenance
Inspection and maintenance
The user is responsible for the safety and environmental compliance of
the heating system.
Regular inspection and maintenance are prerequisites for safe and
environmentally compatible operation of the heating system.
We recommend you enter into a contract for the annual inspection and
demand-dependent maintenance with an authorised contractor.
▶ Have work carried out only by an approved contractor.
▶ If any faults are discovered, have them remedied immediately.
Cleaning the casing
Never use aggressive or corrosive cleaning agents.
▶ Wipe the casing with a damp cloth.
Data on the device
Designation of device1)
1) The information can be found on the data plate in the control panel cover.
Serial number1)
Commissioning date
System installer

Environmental protection and disposal
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10 Environmental protection and disposal
Environmental protection is a fundamental corporate strategy of the
Bosch Group.
The quality of our products, their economy 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 account of economic considerations.
Packaging
Where packaging is concerned, we participate in country-specific
recycling processes that ensure optimum recycling.
Allof ourpackagingmaterialsareenvironmentallycompatible andcan be
recycled.
Used appliances
Used appliances contain valuable materials that can be recycled.
Thevarious assembliescan be easilydismantled. Synthetic materials are
marked accordingly. Assemblies can therefore be sorted by composition
and passed on for recycling or disposal.
11 Technical terms
Operating pressure
The operating pressure is the pressure in the heating system.
Instantaneous water heater principle
The water is heated as it flows through the appliance. The maximum
draw-off rate is quickly available, i.e. without long waiting times or
interruptions for the heat-up process.
Heating controller
The heating controller ensures the automatic control of the flow
temperature depending on the outside temperature (for weather-
compensated controllers) or of the room temperature in conjunction
with a time program.
CH return
The heating return is the pipework that returns the heating water at a
lower temperature from the heating surfaces to the appliance.
Heating flow connection
The heating flow is the pipework that supplies the heating water at a
higher temperature from the appliance to the heating surfaces.
Heating water
The heating water is the water used to fill the heating system.
Thermostatic valve
Thermostatic valves are mechanical temperature controllers that enable
a lower or higher heating water flow rate subject to ambient temperature
in order to maintain a constant temperature.
Siphon
The siphon is a stench trap for draining water that exits a pressure
relief valve.
Flow temperature
Flow temperature is the temperature with which the heated heating
water flows from the appliance to the radiators, underfloor heating
circuits, etc.
DHW circulation pump
A DHW circulation pump circulates the hot water between the storage
tank and draw-off point. This makes DHW available at the draw-off point
immediately.

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Junkersstrasse 20-24
D-73249 Wernau
www.bosch-thermotechnology.com