Page 1
6720866206 (2017/01) IL/AZ/GE
Operating instructions
Wall mounted gas condensing boiler
Condens 2500 W
0 010 010 989-001
WBC 24-1 DC
Page 2
2 | Table of contents
Condens 2500 W6720866206 (2017/01)
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
minimizing 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 Explanation of symbols and safety instructions . . . . . . . . . . . 2
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3
2 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Type overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Prepare for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Open service valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Checking the operating pressure of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.3 Topping up the heating water . . . . . . . . . . . . . . . . . . . . . 4
4 Operating the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Control panel overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Switching on the appliance . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Setting the flow temperature. . . . . . . . . . . . . . . . . . . . . . 5
4.4 Setting the DHW heating . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.4.1 Adjusting the domestic hot water temperature . . . . . . . 5
4.4.2 Setting the comfort mode or eco mode . . . . . . . . . . . . . 6
4.5 Setting the heating control device. . . . . . . . . . . . . . . . . . 6
4.6 Setting summer mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1 Switching off/standby mode . . . . . . . . . . . . . . . . . . . . . . 6
5.2 Setting frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6 Tips on energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9 Environmental protection and disposal . . . . . . . . . . . . . . . . . . 8
10 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)
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Explanation of symbols and safety instructions | 3
6720866206 (2017/01)Condens 2500 W
1.2 General safety instructions
HInstructions for the target group
These operating instructions are intended for the
heating system user.
All instructions must be observed. Failure to comply
with instructions may result in material damage and
personal injury, including possible loss of life.
▶ Read and retain the operating instructions (heat
source, heating controller, etc.) prior to operation.
▶ Observe the safety instructions and warnings.
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.
HRisk to life from poisoning by flue gas
There is a risk to life from escaping flue gas. If flues are
damaged or leaking, observe the following rules.
▶ Switch off the heat source.
▶ Open windows and doors
▶ If necessary, warn your neighbours and leave the
building.
▶ Prevent anyone from entering the building.
▶ Notify an approved contractor.
▶ Have any defects rectified immediately.
HInspection and maintenance
If there is a lack of cleaning, inspection or
maintenance, or if these are carried out incorrectly,
this may result in material damage and/or personal
injury, including possible loss of life.
▶ Have work carried out only by an approved
contractor.
▶ Have any defects rectified immediately.
▶ Have the heating system inspected once a year by
an approved contractor, and have any required
maintenance or cleaning work carried out.
▶ Have the heat source cleaned at least every two
years.
▶ We recommend that you enter into a contract
covering an annual inspection and needs-based
maintenance with an approved contractor.
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.
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 highly flammable or
explosive materials (paper, petrol, thinners, paints
etc.) within the vicinity of the heat source.
▶ Do not store or use any corrosive substances
(solvents, adhesives, chlorinated cleaning agents,
etc.) within the vicinity of the heat source.
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4 | Product Information
Condens 2500 W6720866206 (2017/01)
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 Type overview
WBC...DC appliances are wall-mounted gas condensing boilers with an
integrated heating pump, 3-way valve and plate heat exchanger for
heating and DHW heating using the instantaneous flow principle.
3 Prepare for operation
Fig. 1 Connections on the gas and water side (accessories)
[1] Condensate hose
[2] Heating flow valve
1)
[3] Domestic Hot Water
[4] Gas isolator
1)
(closed)
[5] Hose from the pressure relief valve (heating circuit)
[6] Cold water valve
1)
[7] Heating return valve
1)
3.1 Open service valves
▶ Push the handle down and turn to the left until it stops (handle in flow
direction = open).
Fig. 2 Open service valves
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 the heating water
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 must not be exceeded even at the
maximum heating water temperature. If the maximum pressure is
exceeded, the pressure relief valve opens until the operating pressure is
within the normal range again.
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.
1) ACCESSORIES
7
6 4
3
2
5
1
0 010 005 743-001
0 010 005 744-001
2.
1.
0 010 005 745-001
2
3 1
4
bar
0
0 010 005 746-001
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Operating the appliance | 5
6720866206 (2017/01)Condens 2500 W
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] K key
[2] Burner operation
[3] Fault display
[4] Heating mode
[5] DHW heating
[6] eco mode
[7] Service mode
[8] Temperature display (in °C)
[9] – key
[10] key (eco)
[11] + key
[12] key (reset)
4.2 Switching on the appliance
▶ Switch on the device with the K key.
The display shows the heating water flow temperature.
4.3 Setting the flow temperature
The maximum flow temperature can be set between 30 °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 in Tab. 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 Adjusting the domestic hot water temperature
The DHW temperature can be set between 40 °C and approx. 60 °C.
▶ Press the key.
The set DHW temperature is displayed.
▶ Press the + key or the – key 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 and appear
on the display.
WBC...DC 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.
0 010 002 699-002
0 010 011 017-001
1
12
10
9
43
2
5 6 7 8
11
Flow temperature Sample application
(Symbol appears) Summer mode
approx. 75 °C Radiator heating system
approx. 82 °C Convector heating system
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6 | Shutdown
Condens 2500 W6720866206 (2017/01)
4.4.2 Setting the comfort mode or eco mode
In comfort mode, the appliance is continually kept at the set
temperature. This will mean that there will be a short delay when drawing
DHW, but on the other hand, the device will switch on even if no DHW is
being drawn.
In eco mode, the heating-up to the set temperature begins as soon as the
DHW is being drawn.
For maximum gas and DHW saving:
▶ Briefly open and close the DHW tap.
The water is heated once to the set temperature.
▶ To set eco mode: Press the key until appears on the display.
▶ To return to comfort mode: Press the key until goes out on
the display.
4.5 Setting the heating control device
Observe the operating instructions of the heating controller. This shows
you:
▶ how to set the room temperature.
▶ how to heat economically and save energy.
4.6 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 K key.
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
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 4.6) 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.
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Tips on energy saving | 7
6720866206 (2017/01)Condens 2500 W
6 Tips on energy saving
Economy heating
The device is designed for low energy consumption and low environment
pollution with a big comfort at the same time. The supply of fuel to the
burner is regulated in accordance with the home's heat energy demand.
If the heat energy demand is lower, the appliance continues to operate
with a small flame. The contractors refer to this process as modulating
control. As a result of the modulating control, temperature fluctuations
are kept low and heat is distributed evenly in the rooms. This may mean
that the appliance is in operation for a longer period of time but actually
consumes less fuel than an appliance that is constantly being switched
on and off.
Heating control
To optimise the performance of the heating system, we recommend a
heating control with a room temperature-dependent controller or a
weather-compensated controller and thermostatic valves.
Thermostatic valve
Fully open the thermostatic valves in order to achieve the required room
temperature. Change the required room temperature at the temperature
controller if the temperature is not achieved after a prolonged period.
Underfloor heating system
Never set the flow temperature higher than the maximum flow
temperature recommended by the manufacturer.
Venting
Close the thermostatic valves while airing out the room, and completely
open the windows for a short time. Never leave windows slightly open for
ventilation purposes. Otherwise, heat will be constantly drawn from the
room without significantly improving the ambient air.
Domestic hot water
Always set the DHW temperature as low as possible. Choosing a low
setting at the temperature controller can save you large amounts of
energy.
In addition, high DHW temperatures result in increased scaling and thus
impair the function of the appliance (e.g. longer heat-up times or lower
outlet amount).
DHW circulation pump
Set the DHW circulation pump, if installed, using a time program to suit
individual requirements (such as morning, midday or evening).
7 Troubleshooting
The electronics monitors all safety and control components. If a fault
occurs during operation, the display shows the H symbol and, in
certain cases, the ! symbol, and a fault code (e.g. EA) flashes.
If H and ! appear:
▶ Press key and hold it until the H and ! symbols are no longer
displayed.
The device goes back into operation and the flow temperature is
displayed.
If only H appears:
▶ Switch the device off and on again with the K key. 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
8 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 device
1)
1) The information can be found on the data plate in the control panel cover.
Serial number
1)
Commissioning date
System installer
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8 | Environmental protection and disposal
Condens 2500 W6720866206 (2017/01)
9 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
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 compatible and can be
recycled.
Used appliances
Used appliances contain valuable materials that can be recycled.
The various assemblies can be easily dismantled. Synthetic materials are
marked accordingly. Assemblies can therefore be sorted by composition
and passed on for recycling or disposal.
10 Technical terms
Operating pressure
The operating pressure is the pressure in the heating system.
Wall mounted condensing boiler
The wall mounted condensing boiler does not just use the heat which
arises as the measureable temperature of the products of combustion,
but also the heat from the water vapour. This means that the wall
mounted condensing boiler has a particularly high efficiency.
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 weathercompensated 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.
Page 9
Index | 9
6720866206 (2017/01)Condens 2500 W
Index
A
Adjusting the domestic hot water temperature. . . . . . . . . . . . . . . . . . . 5
C
Combustion gases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Comfort mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
D
Determined use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Display readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
E
Eco mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Environmental protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
F
Fault display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Flue gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Frost protect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
G
Gas type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
H
Hard water. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Heating controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
I
Information on the appliance
Type overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation
Pipe work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
M
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
O
Operating the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
P
Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
S
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Smell of gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Summer mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Switch off
Central heating (summer mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Switch on
Heating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Switching off the central heating (summer mode) . . . . . . . . . . . . . . . . 6
Switching on
Appliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Switching on the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
T
Tips on energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Type overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
U
Used appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Page 10
Page 11
Page 12
Bosch Thermotechnik GmbH
Junkersstrasse 20-24
D-73249 Wernau
www.bosch-thermotechnology.com
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