Brunner KSO User manual

User Guide
KSO
©2023

CONTENTS
1 Note to the ceramic glass pane................................... 4
2 Safety precautions.........................................................5
3 Device description.........................................................9
4 Basic rules for operation............................................ 10
5 Firewood and heating power......................................15
6 Description of parts.....................................................18
7 Adjusting of combustion air.......................................18
8 Lighting the fire in a cold fireplace............................21
9 Stoking up in a warm fireplace.................................. 22
10 Cleaning........................................................................ 23
11 Disposal........................................................................ 27
12 Troubleshooting...........................................................28
13 Note............................................................................... 30
2 User Guide KSO (1.12) © 2023 Brunner GmbH

Please read the entire User Guide before lighting the fire for the first time.
In particular, please note the safety precautions in this manual.
The intended use is provided if the operation specified in these instructions
is observed.
The non-observance of installation and operating instructions will void the
warranty. Any constructional modifications made by the system operator
are not allowed!
Installation must be carried out by an authorized stove-fitter, because safe-
ty and efficiency of the system depend mostly on proper installation of the
product. All valid stove fitting rules and regulations of building law must be
observed and followed.
This fireplace is subject to the provisions of BImSchV (Federal Emission
Protection regulation).
Necessary national and European standards and local regulations must be
observed.
Please follow the relevant regulations of your country. In case of doubt,
check the valid conditions for the operation of fireplaces in your local area.
Subject to technical changes!
Please keep the User Guide for future reference!
For an extended product waranty and a good processing of spare parts de-
liveries, we recommend carrying out the BRUNNER product registration on
(www.produktregistrierung.brunner.de).
© 2023 Brunner GmbH User Guide KSO (1.12) 3

1 NOTE TO THE CERAMIC GLASS PANE
BRUNNER uses only high quality glass ceramic.
In a special manufacturing process, the glass panes become cerammed
and acquire their unique features.
During this process, it is technically not possible to exclude all optical im-
pairments (fine scratches, solid in-clusions, tiny air bubbles)*) .These must
be accepted as results of current technology status, and cannot be consid-
ered as reasons for complaint.
*) - max. 3 air inclusions or solid inclusions < 4mm are accepted, however,
no air inclusions protruding to the glass surface with opening larger than
1mm.
- décor defects smaller than 1mm are allowed as manufacturing toler-
ances.
4 User Guide KSO (1.12) © 2023 Brunner GmbH

2 SAFETY PRECAUTIONS
First start-up
The paint coat of the stove is not completely hardened before
reaching normal operating temperature for the first time. Smoke
emissions and unpleasant odours cannot be excluded. There-
fore, provide sufficient ventilation of the room when lighting the
fire. Open all doors and windows, use an electric fan if neces-
sary, to ensure faster air exchange within the room. During first
operation try to avoid staying in this room for too long, if possi-
ble.
Fireplace/stove door
The fireplace door should be opened only for loading firewood
or cleaning. When the fireplace door is opened, other fireplaces
connected to the same chimney might be affected. Under cer-
tain circumstances this can lead to risk of flue gas poisoning.
The fireplace door must stay closed even if the fire is not burn-
ing.
Combustion air supply
Structural installations for combustion air supply must not be
changed. Regular checks must be carried out to ensure that
they are functioning properly.
© 2023 Brunner GmbH User Guide KSO (1.12) 5

Permitted fuels
Only use the fuels named in the instructions, in the quality and
size specified there. Other fuels are not permitted.
Risk of burns
External surfaces of the fireplace, in particular the glass door,
may get very hot. Do not touch - risk of burns! Remember to
warn your children about this. Basically, children should stay
away from a burning stove.
Always use the supplied operating tool/protective glove for oper-
ation!
Fire hazard
Distance to the cladding
Objects made of flammable materials may not be placed on
available surfaces of the fireplace.
Flammable textile fabrics must have a minimum distance of 5
cm from the vertical surfaces of the fireplace.
Air gratings
Do not close or cover up the warm air vents of your fireplace.
Risk of fire or overheating!
6 User Guide KSO (1.12) © 2023 Brunner GmbH

Prohibited fuels
Never use substances as petrol or alcohol to light a fire!
Unsuitable type, qualitiy or quantity of fuel can lead to damage.
Remove cold ashes
Remember to remove only cold ashes from the fireplace. For
your own security, store the ashes in a fire-resistant container
for at least 24 hours before you dispose of them.
Chimney fire
In case of fire call the fire brigade immediately!
In the case of chimney fire move all flammable parts and ele-
ments away from the chimney.
Cleaning and maintenace
The functionality and safe operation of the fireplace depend on
regular cleaning and professional maintenance.
© 2023 Brunner GmbH User Guide KSO (1.12) 7

Fireplaces with electronic control units
After closing the fireplace door a message must be displayed,
informing that the combustion has been started (see User Guide
of the control system)! If this is not the case, the door contact
switches are defective! Risk of deflagration! Consult your stove
fitter and follow the instructions in chapter “Manual adjusting of
combustion air in the case of emergency” of the User Guide for
the control system.
Heat radiation range
Flammable objects of any kind must be kept outside the heat ra-
diation range of 80 cm in front of the glass door! Fire hazard! Do
not leave any flammable objects in front of the fireplace door. In-
side the heat radiation range no objects with flammable parts are
allowed.
8 User Guide KSO (1.12) © 2023 Brunner GmbH

3 DEVICE DESCRIPTION
The KSO is a storage stove designed for
wood fuel for heating residential units. The
heat generated during combustion is ab-
sorbed by the ceramic components and
given off to the room mainly as radiant
heat via the stove shell. The period of heat
emission is significantly longer than the
heating process, referred to below as “stor-
age tank loading”.
The stove consists of a combustion cham-
ber with a top-mount accumulator, which is
encased by cladding elements. Combus-
tion chamber and top-mount accumulator
are made up of two shelled molded parts
made of high-quality materials.
The cladding can be designed in different
shapes and made of different materials.
High-quality cast iron and special glass ce-
ramic are used for the combustion door.
The KSO is available with manual combustion air adjustment and - op-
tionally - the electronic combustion control EAS. If the device is operated
with EAS, the instructions for EAS must also be observed.
© 2023 Brunner GmbH User Guide KSO (1.12) 9

4 BASIC RULES FOR OPERATION
The service life and functionality of the heating insert depend on correct as-
sembly, proper operation and regular care and maintenance.
The fireplace doors should be opened only for loading firewood or clean-
ing. BRUNNER heaters are designed and optimized for closed operation.
When the fireplace door is open, other fireplaces connected to the same
chimney might be impaired. Under certain circumstances this could lead
to a risk of flue gas poisoning. The fireplace door must always stay closed,
even if the fire is not burning.
Avoid overheating the device! The oven will overheat if it is loaded with
more than the specified maximum amount or if sufficient heating pauses
are not observed.
Stoves and fireplaces from Ulrich Brunner GmbH are designed for period-
ic burning. It means that always a minimal amount of firewood has to be
loaded and the combustion air must be adjusted according to the following
instructions. Insufficient volumes of combustion air will lead to higher emis-
sions and increased staining of the glass door.
Avoid risk of overheating! If the stove temperature is often too high, this
can cause discolorations, especially in the case of stainless steel frames.
Such defects do not constitute a reason for a claim.
Stoking wood
For stoking up we recommend to use a protective glove or the “cold
hand” (delivered with some models), because the door handle gets very
hot after several hours of burning. Open the door slowly. This will avoid
turbulences, which could draw the smoke into the room. The right time for
stoking up is when the wood turned almost completely into glowing em-
bers.
10 User Guide KSO (1.12) © 2023 Brunner GmbH

Heating with accumulation stoves
When using your accumulation stove with ceramic storage mass, please
keep the following heating intervals.
First put the maximal load of wood inside the stove, then light up from
above and let it burn. After combustion ends, wait for approx. one hour,
then put half the load of wood. After another hour has passed from com-
bustion end, put half the load of wood again, if required. These steps can
be repeated after a heating pause of eight hours. If more wood is loaded
over a short time, this can result in overheating and storage mass damage.
Please ask your stove setter for the allowed loads and heating in-
tervals. Different heating intervals will apply, when the stove is op-
erated for the first time!
Heating between seasons
The fireplace needs a chimney draught for com-
bustion air suction and flue gas exhaust. This
chimney draught is reduced, when outdoor tem-
peratures begin to rise. When outdoor temper-
ature exceeds 10°C (50°F), please check the
chimney draught before lighting fire. Im. 1:
Chimney draught test
Damper flap adjustment
If an optional damper flap* has been installed, it has to be opened com-
pletely when the fire is lit. For normal operation with closed door, the
damper flap can be closed up to 2/3, depending on chimney draught.
*The damper flap is installed in the flue pipe connecting piece between
the heating insert and the chimney and regulates the chimney draft.
© 2023 Brunner GmbH User Guide KSO (1.12) 11

Combustion air supply
Proper functioning of a fireplace depends on the volume of combustion air
streaming into the room. Sufficient air supply must be ensured before fire
is lit. If an outside air flap is installed, it has to be opened and must be left
open as long fire is burning. Installed combustion air supply devices cannot
be modified.
Structural changes to the building
If changes are planned and made in or on the building, the conditions for
safe and proper operation of the fireplace can be significantly disrupted.
The prerequisites for safe operation of the fireplace must therefore be
checked by a specialist in the event of changes.
Such changes can be:
•Installation of an additional fireplace
•structural changes to the chimney
•Installation or modification of ventilation devices, e.g. extractor hood,
toilet or bathroom ventilator, controlled ventilation
•Installation or modification of corresponding household appliances, e.g.
exhaust air tumble dryer, central vacuum cleaner system
•Changes to the building's tightness, e.g. through the installation of new
windows or doors, insulation of roof surfaces, full thermal insulation
Combustion chamber linings
Important note: Single cracks on fire-resistant combustion chamber lin-
ings are no reason for concern.
12 User Guide KSO (1.12) © 2023 Brunner GmbH

These exactly dimensioned fireclay plates are manufactured specially for
our fireplaces. They are baked at 1100°C and serve as fire-resistant pro-
tection of steel or cast-iron fireboxes, which significantly extends their ser-
vice life. Most different temperature strains, as well as mechanical impacts
can (or actually will) cause small cracks on these plates. This is absolutely
normal and safe, and does not constitute a reason for a claim.
What is not normal, are chips of stone falling off, or noticeable, star-shaped
cracks on several levels.
Black / anthracite combustion chamber linings may show color changes
during use. This is a normal, unavoidable process and does not constitute
a reason for reclamation.
If the following points are taken into account, the black colour of the fsur-
face will remain intact for a long time:
- Operation as intended with the recommended filling quantities (surface
temperature of fireclay < 700°C).
- No treated or coated wood, coal or liquid fuels; only natural wood with
residual moisture <20%.
- Do not clean the surfaces with steel/wire brushes or cleaning agents.
Viewing glass
When loading wood into the stove, make sure to avoid the falling of wood
onto the viewing glass, where it could burn in contact with the glass. The
resulting thermal stress could lead to permanent discolorations (grey
stains) on the viewing glass.
Door sealing ropes
BRUNNER is using only high-quality door sealing ropes, which are exactly
adapted to the requirements of our heating devices.
Yet the door sealings are wear parts, and therefore are not covered by our
product warranty.
© 2023 Brunner GmbH User Guide KSO (1.12) 13

If the stove is operated as intended, the normal lifetime will be significantly
longer.
Overheating, due to loading more wood as described in the operating in-
structions, direct contact with burning particles (charcoal), as well as use
of unsuitable and aggressive cleansing agents may reduce the product life-
time considerably.
* The damper flap is installed in the flue pipe connecting piece between the
heating insert and the chimney and regulates the chimney draft.
14 User Guide KSO (1.12) © 2023 Brunner GmbH

5 FIREWOOD AND HEATING POWER
The combustion process in our devices has been optimized to enhance
their performance and reduce emissions. You can support our efforts to
protect our environment by respecting the following recommendations for
low-emission heating: Use only dry, natural wood with a residual humidity
factor below 20%, or wood briquettes according to DIN EN 17225-3.
Damp, freshly cut or improperly stored wood has a high water content,
therefore does not want to burn, makes a lot of smoke and gives not much
of heat. Use only firewood which has been stored for at least two years in
a dry place with sufficient air circulation. Because dry wood is much more
calorific, you can save on fuel costs.
For example: Dry wood has a calorific value of approx. 4 kWh/kg, fresh-
ly cut wood only 2 kWh/kg. You will need twice the amount of wood to
achieve the same heating power.
Water content g/kg
wood
Calorific value
kWh/kg
Consumption
raised by %
very dry 100 4,5 0
stored for 2 years 200 4 15
stored for 1 year 350 3 71
freshly cut wood 500 2,1 153
Natural firewood (left) is the
best fuel for fireplaces, but you
can use also wood briquettes
according to DIN 17225-3,
Class A1, length >14 cm (5.51
in), diameter >8 cm (3.15 in)
(right).
© 2023 Brunner GmbH User Guide KSO (1.12) 15

What amount of heat will I get when buying wood
per weight?
1 cubic meter freshly cut
wood
Water content 50% 500 kg x 2,0 kWh/kg = 1000 kWh
1 cubic meter dried wood Water content 30% 500 kg x 3,3 kWh/kg = 1650 kWh
1 cubic meter dry wood Water content 15% 500 kg x 4,1 kWh/kg = 2050 kWh
What amount of heat will I get when buying wood
per volume (1 cubic meter = 1 m3)?
1 cubic meter freshly cut wood Water content 50% 1286 kWh
1 cubic meter dried wood Water content 30% 1518 kWh
1 cubic meter dry wood Water content 15% 1550 kWh
Most suitable for use in open fireplaces are all types of hardwood, like
beech or birch. Softwood species (conifers) have a closed-cell structure
which is bursting during combustion, causing glowing embers to be thrown
out of the fireplace. Hardwood is burning more calm and evenly.
You can control the heat radiation intensity by volume of wood and the in-
tervals for stoking up.
Adjusting the heat by reducing the volume of combustion air is wrong! If
there is not enough combustion air available, the energy contained in fire-
wood cannot be completely released. At the same time, the emissions are
rising due to unburned particles.
16 User Guide KSO (1.12) © 2023 Brunner GmbH

Too much of firewood or inappropriate fuel types can cause overheating
and damage.
No kind of waste shall be burned in a fireplace!
Waste on fire = Toxins in your garden!
Never use combustible fluids, like petrol or alcohol to light a fire!
Mind the waste incineration ban!
Remember to use only the recommended fuels described in this
User Guide. Unsuitable, not recommended fuels are not allowed
to be burned in a fireplace.
Loads of firewood KSO
KSO Load weight per
each burning
min. max.
Log length Feed quanti-
ty for storage
tank loading
Heating pause
after loading
KSO 33 r 2,0 kg - 4,0 kg 33 cm 4,0 kg + 4,0 kg 8 h
KSO 33 q 2,0 kg - 4,0 kg 33 cm 4,0 kg + 4,0 kg 8 h
Loading too much wood into a KSO stove or using improper fuel
may cause overheating and risk of fire!
© 2023 Brunner GmbH User Guide KSO (1.12) 17

6 DESCRIPTION OF PARTS
Pos. Components
1 Base frame
2 Combustion chamber
3 Top-mount accumula-
tor
4 Cladding
5 Firing door
6 Door handle
7 Combustion air ad-
juster (only with manu-
al control variant)
8 Air setting icons
9 Bottom plate combus-
tion chamber
10 Rear wall with air vents
11 Cladding cover
12 Cover top-mount accu-
mulator
13 Base plate
7 ADJUSTING OF COMBUSTION AIR
Combustion air is supplied directly into the fireplace through a separate air
connection. The combustion air flap is integrated in the front assembly, and
for manually operated fireplaces it can be controlled by hand using a con-
trol element.
18 User Guide KSO (1.12) © 2023 Brunner GmbH

For fireplaces with electronic control unit (EAS / EOS), please follow the in-
structions of the user guide provided with the fireplace insert.
Lighting up:
Air control element in left position.
Lighting fire in a cold fireplace or
maximum burning power.
Rated power:
Air control element in middle posi-
tion.
Air supply set to normal burning with
rated power.
Glow position:
Air control element in right position.
Air supply setting for keeping em-
bers. All air supply openings are
closed.
CAUTION: Risk of deflagration! The 'Glow' position cannot be
chosen until flames are visible.
Respect the ventilation requirements for simultaneous operation with other
fireplaces.
© 2023 Brunner GmbH User Guide KSO (1.12) 19

Pay particular attention to the requirements for operation together with ven-
tilation systems.
The simultaneous operation of ventilation or exhaust air systems (extractor
hood) and the fireplace can negatively affect the combustion air supply to
the fireplace. This must be reliably prevented by suitable technical equip-
ment.
20 User Guide KSO (1.12) © 2023 Brunner GmbH