BOSCH Condens 8300i W Wall Mounted Gas Condensing Boiler Instruction Manual
- June 9, 2024
- Bosch
Table of Contents
Condens 8300i W Wall Mounted Gas Condensing Boiler
Instruction Manual
Operation Manual
Wall mounted gas condensing boiler
Condens 8300i W
**GC8300iW 35/40 C
6721841532 (2022/05) AU/NZ**
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.
1.2 General safety instructions
Notices 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.
Determined use
The product may only be used in a domestic situation for the heating of
central heating water and for DHW heating in closed-loop DHW and heating
systems.
Any other use is considered inappropriate. Any damage that may result from
misuse is excluded from liability.
This appliance is not suitable to be used as a pool heater.
****If 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.
Danger 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.
Danger 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.
Inspection, 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.
Conversion 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.
Open 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).
Combustion 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.
Frost damage
If the heating system is not in a frost-proof room and is not in operation, it
may freeze up when exposed to frost. In summer mode or if heating mode is
blocked, only the device frost protection remains active.
▶ Leave the heating system switched on at all times whenever possible, and set
the flow temperature to at least 30 °C,
-or
Have a competent person drain the heating system and DHW pipework at the
lowest point.
-or
Have a competent person mix antifreeze into the heating water and drain the
DHW circuit.
▶ Check every two years whether the minimum frost protection is still ensured.
Safety 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.”
Product Information
2.1 Declaration of conformity
The design and operating characteristics of this product comply with the
European and national requirements.
** The CE marking declares that the product complies with all the
applicable EU legislation, which is stipulated by attaching this marking.
The complete text of the Declaration of Conformity is available on the
Internet: www.bosch-climate.com.au.
2.2 Information about your product on the Internet
We want to actively provide you with suitable information about your product
relevant to your situation. We therefore recommend you use the information
provided on our web pages. You can find the Internet address on the back of
these instructions.
2.3 Display of energy data**
Energy data displayed at a connected accessory, e.g. control unit (remote
control) is based on an estimate using the internal appliance data.
Many factors affect the energy consumption in real life conditions. This means
that the energy data displayed may deviate from the values displayed by an
energy meter.
These values only serve to visualise the energy consumption and to perform
relative comparisons on different days/weeks/months.
They are not suitable to be used as the basis for billing.
Operation
These operating instructions describe the operation of the wall mounted gas
condensing boiler. Depending on the heating controller, the operation of
several functions may deviate from the description. Observe the operating
instructions for the heating controller used.
3.1 Turn unit on/off
Switching on
▶ Switch the appliance ON using the ON/OFF switch.
** When and the flow temperature appear alternately on the display, the
device remains in heating mode at the lowest heat output for 15 minutes to
fill the condensate trap in the device.
Stop
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).
** The anti-seizing function is not active when the device is switched off.
The anti-seizing function prevents the heating pump and the 3-way valve from
seizing up following long periods of inactivity.
▶ Switch off the device using the On/Off switch (→ Fig 1).
3.2 Display overview
- Display
- and keys
- key
- ok/heating pressure key
- eco key
- DHW key
- Heating key
3.3 Display readings
- Digital output
- Heating Mode
- Error display
- Burner operation
- Internet connection
- Wireless connection
- Chimney sweep mode (for service technician only)
- Service mode
- ECO mode active
- DHW heating
3.4 Heating key
WARNING
Risk of scalding!
If the device is switched from heating mode to DHW mode, the DHW temperature
may briefly increase above the set temperature if the heating water flow
temperature is set higher than the domestic hot water temperature.
▶ Do not set the heating water flow temperature above 65 °C (default setting).
▶ If the heating water flow temperature is set above 65 °C: Use a thermostatic
mixing valve (e.g. shower fitting).
3.4.1 Setting the maximum heating water temperature
The temperature of the heating water is adjusted via the flow temperature.
**** With underfloor heating systems observe the maximum permissible flow
temperature.
▶ Press the Heating key . The set flow temperature flashes.
▶ Press the (→Tab. 1), key or to set the desired maximum flow temperature.
The setting is applied after 5 s or after pressing the OK key.
| Supply temperature | Application example |
|---|---|
| Approx. 50 °C |
Underfloor heating system
Approx. 65 °C| Radiator heating system
Approx. 82 °C| Convector heating system
Table 1 Maximum flow temperature
3.4.2 Setting summer mode
The heating pump and consequently the heating are switched off in
summer mode. The DHW supply and the power supply for the control
system remain active.
Summer mode setting:
▶ Press the Heating key .
▶ Press the key until appears on the display.
The setting is applied after 5 s or after pressing the OK key. The display
shows .
Switch off summer mode:
▶ Press the Heating key .
▶ Press key to set the required maximum flow temperature.
The setting is applied after 5 s or after pressing the OK key. The display
shows .
Further notices can be found in the operating instructions for the heating
control.
3.5 DHW key (domestic hot water)
3.5.1 Set DHW temperature
WARNING
Risk of scalding!
If the device is switched from heating mode to DHW mode, the DHW temperature
may briefly increase above the set temperature if the heating water flow
temperature is set higher than the domestic hot water temperature.
▶ Do not set the heating water flow temperature above 65 °C (default setting).
▶ If the heating water flow temperature is set above 65 °C: Use a thermostatic
mixing valve (e.g. shower fitting).
▶ Press the DHW key *.
The set DHW temperature is displayed.
▶ Press the or key to set the required DHW temperature The setting is applied
after 5 s or after pressing the OK key.
Measures for hard water
To protect against increased limescale and resulting service work:
** If the water is calcareous with a hard hardness range (≥ 15°dH / 27°fH/
2.7 mmol/l)
▶ Set the DHW temperature to less than 55 °C.
3.5.2 Switch off DHW heating
▶ Press the DHW key .
▶ Press the key until appears on the display.
The setting is applied after 5 s or after pressing the OK key. The display
shows .
3.6 eco key
Comfort mode (no eco appears in the display)
The appliance is continually kept at the set temperature in comfort mode. This
results in a brief delay when hot water is drawn. The device therefore
switches on, even if no domestic hot water is drawn.
ECO mode
In ECO mode, heating-up to the set temperature begins as soon as DHW starts to
be drawn.
▶ To set ECO mode, press the eco key. eco appears on the display.
▶ To return to comfort mode, press the eco key. eco goes out on the
display.
** For maximum gas and DHW saving:
▶ Briefly open and close the DHW tap.
The water is heated once to the set temperature.
Thermal disinfection
To prevent hot water from becoming contaminated by bacteria such as
legionella, we recommend thermal disinfection after long downtimes. You can
program a heating controller with hot water control to perform thermal
disinfection. Alternately, you can have a contractor carry out thermal
disinfection.
CAUTION
Risk of scalding.
During thermal disinfection, discharging unmixed hot water can cause serious
scalding.
▶ Only use the maximum adjustable hot water temperature for thermal
disinfection.
▶ Inform occupants of the premises of the risk of scalding.
▶ Perform thermal disinfection outside of the normal operating times.
▶ Do not discharge DHW unmixed.
Proper thermal disinfection involves the DHW system including the draw-off
points.
▶ Set the thermal disinfection in the hot water program of the heating
controller → heating controller operating instructions).
▶ Close DHW draw-off points.
▶ Enable continuous operation of any DHW circulation pump that may be
installed.
▶ Once the maximum temperature is reached, open the DHW draw-off points one by
one, starting from the nearest and ending in the farthest, and draw off DHW
until hot water at 70 °C has been discharging for 3 minutes.
▶ Restore the original settings.
Tips on saving energy
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. Experts
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 weathercompensated 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.
Floor 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).
Circulating 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).
Faults
6.1 Reset faults
The symbol H indicates that a fault has occurred. The cause of the fault is
displayed in encoded form (e.g. fault code 228).
** Repeated attempts to reset a fault can lead to the appliance being
locked for safety reasons (fault code 2980). This lock can only be removed by
a qualified professional or the customer service after the cause of the fault
has been determined and remedied on site.
▶ Switch off the appliance and switch it on again.
-or-
Reset the fault on the appliance.
As soon as the fault is no longer displayed, the appliance returns into
operation.
If the fault is still displayed:
▶ To ensure system safety, call a qualified professional or the customer
service immediately.
▶ Inform them of the fault code and the appliance data.
▶ Arrange an on-site appointment and have the cause of the fault determined
and remedied immediately.
Appliance data**
Appliance name…………………….
Serial number…………………………..
Date of commissioning………………..
System installer………………………..
Table 2 Appliance data to be passed on in the event of a fault
Maintenance
Inspection, 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.
Cleaning the casing
Never use aggressive or corrosive cleaning agents.
▶ Wipe the casing with a damp cloth.
Check the operating pressure of the heating system
The standard operating pressure is 1 – 2 bar.
Should a higher operating pressure be required, ask your contractor.
▶ Press the ok key.
The operating pressure is shown in the display.
Fault display: System pressure too low
If the system pressure in the heating system falls below the minimum pressure
that has been set, the display shows the message LoPr => L0.X bar. The system
pressure is too low.
▶ Fill the heating system.
If the system pressure in the heating system drops below 0.3 bar, the display
shows the message LoPr alternating with the operating pressure. The heating
system is then blocked.
▶ Fill the heating system.
Topping up the heating water
NOTICE
Material damage due to thermal stresses!
When topping up with cold heating water, thermal stresses can lead to cracking
due to internal stress.
▶ Only fill the heating system when it is in a cold state. Maximum flow
temperature 40 °C.
Maximum pressure of 3 bar at maximum heating water temperature must not be
exceeded (pressure relief valve will open).
▶ Open the valve until the desired pressure is reached.
Bleeding radiators
If radiators heat up at different rates:
▶Bleed radiators.
Checking and refill the heat transfer fluid of the solar thermal
system
Heat transfer fluid may only be topped up by an expert.
▶ Have the frost protection of the heat transfer fluid checked annually.
▶ Have the corrosion protection (pH value) of the heat transfer fluid checked
every 2 years.
The maximum pressure of 6 bar with solar thermal system at maximum temperature
must not be exceeded (pressure relief valve opens).
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.
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.
Old electrical and electronic appliances
This symbol means that the product must not be disposed of with other waste,
and instead must be taken to the waste collection points for treatment,
collection, recycling and disposal.
**** The symbol is valid in countries where waste electrical and electronic
equipment regulations apply, e.g. “European Directive 2012/ 19/EC on old
electronic and electrical appliances”. These regulations define the framework
for the return and recycling of old electronic appliances that apply in each
country.
As electronic devices may contain hazardous substances, it needs to be
recycled responsibly in order to minimize any potential harm to the
environment and human health. Furthermore, recycling of electronic scrap helps
preserve natural resources.
For additional information on the environmentally compatible disposal of old
electrical and electronic appliances, please contact the relevant local
authorities, your household waste disposal service or the retailer where you
purchased the product.
You can find more information here: www.weee.bosch-
thermotechnology.com/
Batteries
Batteries must not be disposed together with your household waste. Used
batteries must be disposed of in local collection systems.
Technical terms
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.
Operating pressure
The operating pressure is the pressure in the heating system.
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.
Robert Bosch (Australia) Pty Ltd
Thermotechnology Division
1555 Centre Road
Clayton Victoria 3168
Australia
Phone: 1300 30 70 37
Fax: 1300 30 70 38
www.bosch-climate.com.au
New Zealand
Phone: 0800 54 33 52
Fax: 0800 54 33 55
www.bosch-climate.co.nz
References
- Bosch Hot Water & Heating - Residential | Bosch Thermotechnology
- Bosch Hot Water & Heating - Residential | Bosch Thermotechnology
- WEEE Electronic Waste | Bosch Home Comfort Group