KFD STO MAX 7 3F User manual

Installation and operation
manual for stoves
STO MAX 7 3F STO MAX 7

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The fireplace insert is a heating and decorative device, allowing construction of a complete heating
system based on distribution of hot air. It is not an autonomous heating device but a component of the
heating system. Due to the above reasons, its operation and safety largely depends on the method of
installation and materials used. Considering that, it is recommended that installation of the insert is
commissioned to an Authorised KFD Fitter, guaranteeing an appropriate standard of service.
All domestic and local regulations ought to be observed.
1Construction of the stoves..........................................................................................3
1.1 Placement of the stove ....................................................................................................................................3
1.2 Preparation and unpacking .............................................................................................................................3
1.3 General assembly rules...................................................................................................................................3
1.4 Assembly of cladding .......................................................................................................................................3
2Installation....................................................................................................................4
2.1 Stove placement ..................................................................................................................................................4
2.2 Chimney.............................................................................................................................................................5
2.3 Tip of the chimney ............................................................................................................................................8
2.4 Connection to the external air intake.............................................................................................................9
3Stove operation..........................................................................................................10
3.1 Lightning ...........................................................................................................................................................10
3.2 Flame control.....................................................................................................................................................10
3.2.1 In case of emergencies...................................................................................................................................................................... 11
3.2.2 Glass.................................................................................................................................................................................................... 11
3.2.3 Cleaning out the ashes...................................................................................................................................................................... 11
3.2.4 Removing and cleaning of deflector................................................................................................................................................. 11
3.2.5 Summer break in device usage........................................................................................................................................................ 12
3.3 Fuel for the stove............................................................................................................................................12
3.4 Hints for users.................................................................................................................................................12
4Parameter selection for flue pipe .............................................................................14
5Technical specifications............................................................................................15
6Troubleshooting.........................................................................................................17
7Inspection log.............................................................................................................19

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1 Construction of the stoves
1.1 Placement of the stove
Ventilation: To allow proper operation, verify that the oxygen equired for combustion can be
obtained in sufficient quantity in the place where it is to install the appliance.
Location of appliance: Choose a central location in the room that favors a good distribution.
Ensure that there aren't made or coated with materials that are flammable or degrade with
heat effect (wallpaper, carpet, light closures based on plastics, etc.)
Not allowed the installation of the stove in bedrooms or bathrooms neither in places
that has been already installed other heating appliance or a fume extraction system
without an independent air intake (kitchen extractor, fireplace, stove, etc.).
It is forbidden to place the fireplace in explosive environments.
With wooden floors, provide for protection of the soil surface in accordance with the
rules in force in the country.
1.2 Preparation and unpacking
When you unpack the fireplace, check for perfect operation, as well as the possible
presence of shipping damage. Any anomalies must be immediately reported to the
transport carrier or seller.
Check the accordance with what is provided.
The chimney must always move in VERTICAL position
The glass is fragile, it's necessary to protect it.
If possible, unpack the fireplace near the area where you will install it.
1.3 General assembly rules
The appliance must always lean on a structure which support the weight and leave at
least 5 cm air gap between the chimney and walls
If the chimney is placed on a floor or near combustible walls, a proper insulation is
recommended.
1.4 Assembly of cladding
The fireplace and the parts of the cladding must be attached together WITHOUT ANY
CONTACT WITH STEEL STRUCTURE to prevent heat transmission to the coating and allow
thermal expansions. Beware of wood finishes such as beams or shelves, which must be
properly insulated.
In particular, the shelves should be placed at a distance upper to 30 cm from the top of the
appliance.

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2Installation
2.1 Stove placement
During stove installation put attention to placement of the combustible elements. Minimum
distances which should be preserved are:
a) Side (A) –61 cm
b) Side (B) –150 cm in case of glassed side
c) Back (A)–61 cm
d) Front (B)–150 cm
e) Side (C) –50 cm
f) Side (D) –122 cm in case of glassed side
View from above
View from above

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KFD stove must be installed on fireproof surface. If stove is going to be placed on wooden
floor or similar combustible surface, it must be preserved with high temperature (fire)
resistant material. Floor must be preserved under and around the stove.
Local regulations in exact country have the primacy of information presented in this
manual.
All local standards and regulations regarding to distance of the wall and exhaust pipe.
2.2 Chimney
After stove installation the stoves air outlet must be connected with exhaust gas pipe. This
connection should be made with attested pipe which can be used into solid fuel fireplaces. Its
diameter should match the air outlet diameter. If there is any need of reducing this diameter
use proper reduction connectors. Connection between reduction and the stove must be
sealed. The last phase of connecting the stove with the chimney is assembling the
connection pipe with the chimney.
The chimney must have at least as much air as you need for a normal combustion of the
appliance and the ventilation of the place. Respect the UNI 10683 norm relative to the
ventilation openings.
Basic requirements for chimney pipes, which are used for stove connection are:
- Chimney pipe must have round cross-section area,
- It should be heat isolated and waterproof, made of materials which are resistant to
high temperatures, exhaust emission products,
- It cannot have any reductions or deviations bigger than 30 º,
- For rectangular cross-section the bigger side ratio should not be higher than ½,
- The minimum height of chimney pipe should be 4 meters counting from the place
where fireplace is connected into it,
- It should have washout which allows to gather and remove all remaining of exhaust
process,
- Too big cross-section of the chimney pipe might cause problems with the way how the
device works,
- Too small cross-section area of the chimney pipe might greatly reduce the devices
draft and make it fume.
The under pressure into chimney should be around 10-12 Pa. It should be measured during
the work of the stove. When the under pressure is more than 17 Pa, installation of the
moderator should be considered to lower and stabilize it.

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Figure 1a. Correct connection between the stove and the chimney pipe.
The ventilation grilles must be installed so that cannot be obstructed
Figure 1b. Required chimney heights according to the norm PN-89/B-10425: a) flat roof
covered with any material, b) steep roof with easily ignitable covering, c) steep roof with
non-ignitable, incombustible and flash resistant covering, d) situation of the chimney
nearby another building.
>=0,6 m
<=12o
>=0,6 m
>12o
>=0,3m
>12o
>= 1m
>3m
<=3m
<=1,5m
>=0,3m
>=0,3m
12o
a)
b)
c)
d)

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Note
Safe distance between the internal side of the chimney and combustible elements is at
least 16 cm in case of a brick chimney. In case of steel chimneys, the information is
specified by the manufacturer (X).
Insulated
steel chimney
Combustible
elements
X
Brick
chimney
160
Combustible
elements
Figure 2. Safe distance of the chimney from combustible elements (dimensions in mm).
Safe distance for conducting the connecting pipe (combustion gas pipe) through a
combustible wall is at least 20 cm.
Figure 3. Method of conducting the combustion gas pipe through a combustible wall
(dimensions in mm).
200
200
200
Ściana palna
Rura spalinowa
Wypełnienie
(lekki beton lub wełna) Kryza
z blachy stalowej
Filling (lightweight
concrete or wool)
Combustible wall
Combustion gas pipe
Steel sheet cap

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2.3 Tip of the chimney
The strength and stability of draught in the chimney depend as well on the kind of chimney
tip. It ought to reach above the roof ridge and protect the outlet against rain and adverse
impact of wind (figure 7).
(a)
(b)
(3)
Figure. 4 Example chimney tips: a) prefabricated tip, b) brick version, c) steel tip –so called
chimney cowl.
The chimney tip ought to meet the following requirements:
its internal diameter should be equal to the diameter of the chimney,
usable diameter of the combustion gas outlet is to be twice the size of the chimney
diameter,
it ought to protect the chimney against adverse weather (rain, snow) and foreign bodies,
it ought to be easily accessible for maintenance and cleaning of the chimney,
in case of two adjacent chimneys, tip of one chimney ought to be located at least 50 cm
above the other one, in order to avoid mutual interference of produced negative
pressure (figure 8),
chimney tip ought to be situated 6 m away from any obstructions, such as walls, rocks
or trees according to the local in regulations. Otherwise, the chimney ought to be
extended to protrude approximately 1 m above the existing obstruction. The chimney tip
ought to be situated approximately 1 m above the roof surface (figure 9).
Figure 5. Construction of adjacent chimneys.
Figure 5a. Chimney placement
2 m
6 m
1 m

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2.4 Connection to the external air intake
Figure 6. Connection to the external air intake
The smoke exhaust system must be unique to the insert (Not allowed pipe discharges
common to other fireplace).
Fumes discharged is made from the opening situated at the top. The discharge pipe must be
connected to the outside using appropriate tubes and eventual isolation. Is necessary to use
materials resistant to high temperatures.

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3 Stove operation
Warning!
Modern technology used in construction of the central heating systems guarantee
very high level of safety and reduce maintenance operations to minimum. Beside that
it must be remembered that fire is dangerous element which need a lot of attention.
Using stove remember about safety. The main requirement which guarantee safe
exploitation is regular maintenance of the chimney.
3.1 Lightning
During first run we suggest to operate stove carefully and to use small pieces of dry wood. It
is not recommended to use more than about 4kg of wood.
Under no circumstances for setting up fire do not use: alcohol, gasoline and other flammable
substances.
During first lightning the process of paint curing might produce some strange smell. In this
situation, the area should be vigorously ventilated.
When there is a need to add more wood to stove, the door should be opened slowly to
prevent smoke from coming out.
Wood excess in stove might lead to stove overheat which might damage it.
During stove usage its elements heat to high temperatures. There is a need to take a lot of
attention and all actions connected with stove maintenance should be done in safety gloves.
Remember to keep stoves door closed.
3.2 Flame control
Flame regulation is done by shifters which are on the front of the stove.
Depending on the model the placement of the shifters are:

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When the moment of desired flame is reached, the primary air shifter should be pushed
inside. In this placement primary air is blocked and flame is controlled by secondary air
shifter. After desired control over side curtain is reached it should be left in permanent
position.
3.2.1 In case of emergencies
If there is any need that fire has to be extinguished or there is a fire in the chimney the
procedure is:
close the door
close all air inlets (primary, secondary, side curtain)
call fire brigade to extinguish the fire in the chimney
3.2.2 Glass
Glass is very important part of stove because of its aesthetic and operation features. Glass
with air curtain require to be cleaned often (few days). Some special products to clean it can
be used. Inner side of glass can be cleaned with ash and wet paper or some rag. Inner side
must be cleaned carefully. Outside surface of the glass can be cleaned with products used
for window cleaning.
Do not use chemical agents which are used for cleaning stoves, barbecues and ovens. It can
damage glass or paint.
Cracking of the glass: Vitroceramic Glasses used in KFD fireplaces are high temperature
resistant (up to 750 degrees). Glass can crack only from mechanical damages.
3.2.3 Cleaning out the ashes
KFD stove is provided with grate and the ash drawer. It is recommended to clean out ash
drawer often. It is recommended to regularly remove the ash from drawer to prevent it from
over excess.
Remember to clean out ash drawer only when the stove is not used. For safety check out the
air inlet canal which should be cleaned every year.
3.2.4 Removing and cleaning of deflector.
The picture below shows how to disassemble the deflector. Move front part of deflector up
and lower it slowly.

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Way of disassembling deflector
To assembly deflector you need to do the same actions as during deflector removal.
Deflector mounting channel must be put into proper place on the back plate.
To clean deflector use brush.
3.2.5 Summer break in device usage.
When the air humidity in the room where the fireplace is installed is high, put inside the stove
substance which absorb humidity.
3.3 Fuel for the stove
Regardless of the class, type or brand of stove it is important to use only proper fuel. The
only wood which must be used is wood from leafy trees. It should be seasoned for minimum
18 months on free air under some shelter. Wood must be chopped and seasoned on the
fresh air. This will guarantee that stove will work perfectly and it will stay in good condition.
One cubic meter of wood which has got 20% moisture consists about 60 l. of water. This
amount of wood two months after being cut has got about 350 l of water. Using this type of
wood will lead to glass getting dirty.
There should be maximum 2-3 logs of wood in fireplaces hearth. It should be 20-40 long. The
best diameter of logs is between 12 and 15 cm. Do not use briquette, coal, trashes, wet
wood, painted wood or plastic as fireplaces fuel. When you use those products you
automatically will lose warranty. Use paper only for lighting the device up.
3.4 Hints for users
! Forbidden fuel for stoves: coal and its derivatives, briquette, hay, carpentry
scraps, wood with moisture under 10%, plastic and trash. It is also forbidden to
use flammable chemical agents for lighting up.
! Never extinguish fire with water.
! Do not touch device when it is working because you might get burned. During
its work it is necessary to use safety gloves.
! It is important to clean the ash tray often to prevent it from fill.
! Do not leave stove working without ash drawer inside.
! Do not leave working stove with door open without supervision.

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! Parts like grate, deflector and seals are not the subject of the warranty and
they should be replaced during the maintenance regarding to their level of
usage.
! Technical overview should be done every year by the authorised installers of
KFD.
! Missing deflector can lead to big pressure which may lead to rapid
combustion, excessive wood usage and overheat of the device.
! To avoid the danger of glass cracking, glass cleaning must be done on cold
device.
! It is forbidden to use liquid agents like alcohol, gasoline, oil etc.
! Leftovers after the burning process (ash) should be gathered into hermetic bin
which is resistant to high temperature.
! Device cannot be used in place where is emission of any gasses or fumes
(eg. gasoline, glue etc.). Do not leave flammable materials near the device.
Children must be cautioned not to touch the device while it is working or just
after it has finished its work.
! If there is a fire in the fireplace you need to:
Close fireplace door
Close air inlet
Put off the fire with fire extinguisher (CO2powder)
Immediately call the fire brigade
! Do not light up the fireplace if there are and fumes in the room (eg. after floor
varnish).
! Until the construction works in the place where fireplace is it should be
preserved from external factors and it should not be used.
! Do not lead the device to overheat, which can be noticed by the glow of the
cast parts. In case of situation like that you need to reduce the air inlet
(combustion speed). If it is not possible you need fire to extinguish itself.
Leading cast to glow may lead to device damage. This type of damage is not
under the device warranty.
! Regulation of primary air is in the front of the stove, under its door. Pulling it
increase air flow, pushing it decrease air flow delivered to fireplace.
! For cleaning of the elements painted with high temperature resistant paint do
not use any chemical agents. They can be cleaned only by wet cotton rag.

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4 Parameter selection for flue pipe
Height and diameter of the flue pipe depending on the area of the fireplace door. Chimney
height should be measured from the point fireplace is mounted.
One sided central fireplace:
Area= a*h [m2]
Two or more sided fireplace:
Area= a*h*1.75 [m2]
Minimum reduced hydraulic diameter cannot be less than:
DHmin= inner nominal diameter –10% [mm],
When flue pipe height is according to picture above.

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5 Technical specifications
KFD STO
M / MAX 7
3F
KFD STO M
/ MAX 7
energy efficiency class
A+
A+
direct heat output (nominal power)
[kW]
11,5
11,5
heating power range
[kW]
6 - 15
6 - 15
energy efficiency index
[EEI]
110,6
110,6
energy efficiency at nominal heat output
[%]
82,5
82,5
seasonal space heating energy efficiency
[%]
73,5
73,5
CO emission at 13% O2
[%]
0,09
0,09
[mg/Nm3]
1162
1162
dust emission at 13% O2
[mg/Nm3]
19
19
OGC at 13% O2
[mg/Nm3]
51
51
NOX emission at 13% O2
[mg/Nm3]
145
145
flue gas mass flow
[g/s]
9,75
9,75
verage smoke temperature at smoke outlet
[°C]
235
235
minimum chimney draft
[Pa]
12
12
weight
[kg]
145
140
KFD ECO MAX 7 3F

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KFD ECO MAX 7

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6 Troubleshooting
PROBLEM
REASON
SOLUTION
I. Poor control of fire in
the furnace.
1. Excessive quantity of combustion
air.
1. Reduce the quantity of
combustion air using the adjustment
lever in the fireplace insert.
2. Open chimney damper.
2. Close the chimney damper.
3. Excessive quantity of inserted
fuel.
3. Do not put more fuel and reduce
the quantity of combustion air, close
the chimney damper.
4. Worn gaskets.
4. Fit new gaskets.
5. Excessive negative pressure in
the chimney.
5. Install a cap type chimney
attachment and/or install a draught
moderator.
II. Fire cannot be lit up
in the furnace
1. Closed levers of combustion air
inlet.
1. Increase the quantity of
combustion air.
2. Clogged openings of air blow-in
in the furnace.
2. Clean furnace interior from ash.
3. Insufficient negative pressure in
the chimney.
3. Check if the inspection door is
closed; clean the chimney and
connecting duct; recommended
installation of a mechanical
combustion gas exhaust.
4. Too humid wood.
4. Replace the wood with dry wood
(humidity under 20%)
5. Too large slivers used for lighting
up.
5. Use smaller slivers.
6. Bad weather conditions.
6. Check if burning improves once
the weather is better. In case of
recurring problems resulting from
weather conditions, installation of a
mechanical combustion gas
exhaust is recommended.
III. Smoke comes out
from the fireplace insert
1. The chimney and/or connecting
pipe is not passable.
1. Cleaning of the chimney and
connecting pipe is necessary.
2. The chimney and/or connecting
pipe is not tight.
2. Check tightness of closing the
inspection door in the chimney and
connection of the connecting pipe.
3. Excessive negative pressure in
the room in which the fireplace is
installed.
3. Supply fresh air to the room in
which the fireplace is installed (e.g.
open the window).

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4. Fresh air inlet is not passable.
4. Check if the duct supplying fresh
air to the fireplace is passable.
5. Air inlet is installed at the
leeward side.
5. Change location of the air intake.
6. Incorrectly constructed
ventilation of the fireplace insert.
6. Check if convection air inlets
under the insert are constructed
correctly.
IV. Smoke comes out
from the fireplace
enclosure when the
door is closed
1. Connecting pipe is not tight.
1. Check if connection of the
connecting pipe is tight.
2. The tee pipe in the chimney is
not tight.
2. Check if the connecting tee pipe
in the chimney is tight.
V. Significant bloom of
tarry substances
(creosote) appears on
the glass pane
1. Too humid wood.
1. Replace the wood with dry wood
(humidity under 20%).
2. Insufficient negative pressure in
the chimney.
2. Check the reasons described in
points III 1-4.
3. Clogged air blow-in openings in
the furnace.
3. Clean interior of the furnace from
ash.
VI. Fire in the chimney
or flue
1. To be evaluated by the fire
brigade.
1. Close the door of the fireplace
insert.
2. Close combustion air inlets.
3. Extinguish the fire using carbon
dioxide extinguishers (CO2, dry
powder extinguishers) –Never
extinguish fire inside the chimney
using water!
4. Call the fire brigade immediately.
VII. No power supply
(water module option)
No power supply
1. Do not add more fuel, open the
chimney damper and door of the
fireplace insert.

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7 Inspection log
The inspection ought to be performed once a year by an Authorised KFD Fitter.
Date
Performed work
Company/Signature

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