KOTLOSPAW SlimKo Plus Installation guide

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KOTŁOSPAW Sp. z o.o.
UL. SZENICA 38, 63-300 PLESZEW
phone numer 600-494-315
[email protected]
OPERATION AND MAINTENANCE DOCUMENTATION
Operation and assembly instructions
„SlimKo Plus” ……... kW
Serial no. …………….
Year of production …………….
ORIGINAL
Issue I
January 2022

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Water boilers for central heating system
with pellet burner
Dear customer,
thank you for choosing our product.
We hope that the product you have chosen will meet all your expectations.
Warning!
The boilers meet the requirements of:
emission limit according to PN-EN 303-5: 2021- class 5
ecodesign
energy efficiency –class A+
Before installing and using the boiler, please read this documentation carefully.
WARNING: In case of any doubts or other suggestions regarding the information in this manual,
please contact us at handlo[email protected]
Always install and operate the boiler in accordance with applicable regulations and standards

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TABLE OF CONTENT
1.INTRODUCTION.................................................................................................................................................................. 5
1.1. General information .................................................................................................................................................... 5
1.2. General terms of use and warranty conditions ....................................................................................................... 6
1.3.Delivery specification................................................................................................................................................... 7
1.4.Transport of the boiler ................................................................................................................................................. 7
2. DESCRIPTION AND PURPOSE ...................................................................................................................................... 8
3. TECHNICAL AND OPERATING FEATURES................................................................................................................. 8
4. SELECTING BOILER FOR THE HEATING SYSTEM................................................................................................... 8
4.1.Heat demand for residential buildings....................................................................................................................... 8
5. TYPES OF FUEL ................................................................................................................................................................ 9
6. DESIGN DESCRIPTION.................................................................................................................................................... 9
6.1. Pellet feeder assembly............................................................................................................................................. 13
6.2. Types of boiler safety features ................................................................................................................................ 14
6.3. Burner safety systems.............................................................................................................................................. 14
7. CONNECTING BOILER TO HEATING SYSTEM ........................................................................................................ 15
7.1. Place of installation................................................................................................................................................... 15
7.2. Flue installation ......................................................................................................................................................... 16
7.3. Central heating system ............................................................................................................................................ 21
7.4. Protection of boiler in an open-loop system .......................................................................................................... 22
7.5. Protection of boiler in a closed-loop system.......................................................................................................... 25
7.5.1. Protection of boiler............................................................................................................................................ 25
7.5.3. Discharge-filling valve. ..................................................................................................................................... 25
7.5.4. Assembly requirements.................................................................................................................................... 26
7.5.5. Safety requirements ......................................................................................................................................... 27
7.5.7. Installation scheme ........................................................................................................................................... 29
7.5.8. Requirements for closed-loop system operation .......................................................................................... 30
7.5.9. Guidelinges for selecting expansion vessels (closed loop systems) acc. to PN-EN 12828:2003......... 30
7.5.10. Calculating the size of the expansion vessel.............................................................................................. 33
8. WIRING ............................................................................................................................................................................. 39
9. FILLING WITH WATER.................................................................................................................................................... 42

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10. RETURN PROTECTION OF THE BOILER ................................................................................................................ 42
11. TECHNICAL AND OPERATIONAL DATA .................................................................................................................. 42
12. COMMISSIONING.......................................................................................................................................................... 46
12.1. Pre-testing................................................................................................................................................................ 47
12.2 Firing up .................................................................................................................................................................... 47
12.3 Fuel refilling............................................................................................................................................................... 47
13. POWER ADJUSTMENT ................................................................................................................................................ 48
14. BASIC CONDITIONS FOR SAFE OPERATION........................................................................................................ 48
15. DISTURBANCES IN THE OPERATION OF THE BOILER. FREQUENTLY OCCURRING PROBLEMS AND
HOW TO SOLVE THEM....................................................................................................................................................... 49
15.1 The main causes of disturbances and malfunctions in the operation of the boiler are:................................. 49
16. CLEANING AND MAINTENANCE ............................................................................................................................... 51
17. FIRE SAFETY ................................................................................................................................................................. 52
19. SHUTTING DOWN THE BOILER ................................................................................................................................ 53
20. FINAL PROVISIONS...................................................................................................................................................... 53
21. ENVIRONMENTAL PROTECTION.............................................................................................................................. 54
22. RESIDUAL RISK............................................................................................................................................................. 54
22.1. Causes of residual risk and how to eliminate it. ................................................................................................. 55
23. CONDITIONS TO BE MET FOR SAFE OPERATION OF THE BOILER ............................................................... 56
24. ECODESIGN INFO CARD ............................................................................................................................................ 59
25.PRODUCT SHEET .......................................................................................................................................................... 61
26. WARRANTY CONDITIONS .......................................................................................................................................... 67
27. WARRANTY PERIOD.................................................................................................................................................... 68
28. WARRANTY CARD ....................................................................................................................................................... 75

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1.INTRODUCTION
The purchased heating device is the latest generation central heating water boiler meeting the
requirements of EU directives, regulations, and standards at the highest European level as well as
Polish regulations.
Boilers meet the following requirements:
emission limit acc. to PN-EN 303-5: 2021 - class 5
ecodesign
energy efficiency –class A+
Polish legislation has already introduced the application of ecodesign requirements, which puts Polish
manufactures and our company in a positive light when it comes to environmental protection and anti-
smog policy.
1.1. General information
The Operation and Maintenance Documentation is a manual for solid fuel boilers with automatic fuel
feeding for users of central heating water boilers with a SlimKo Plus-type pellet burner.
Familiarizing yourself with the Operation and Maintenance Documentation, which contains information
about the design, installation, and use of boilers is necessary for their proper and safe operation.
The use of a modern and high-class feeder and regulator is essential for automatic and trouble-free
operation. Information about the burner and regulator for the boiler provided in this Operation and
Maintenance Documentation is general. The detailed instructions for the use of these devices are to
be found in the manuals of these devices, which are an integral part of the boiler manual.
Before installing and operating the boiler, it is necessary to:
- thoroughly read this Operation and Maintenance Documentation of the boiler and burner, as well
as other manuals of devices/equipment of the boiler.
- check the content of the package, compare the data on the identification plate with the warranty
card,
- check that the boiler has not been damaged during transport.
The boiler has an identification plate located in a visible place which contains the following information:
- name and address of the manufacturer,
- trademark and type of boiler,
- number and year of production,
- nominal thermal power,
- boiler class,
- max. allowed working pressure in bar,
- max. working temperature in °C,
- water capacity in liters,

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- electrical supply [V, Hz, A] and power consumption in [W].
- fuel class according to PN-EN 303-5 standard.
The "SlimKo Plus" boiler is equipped with a modern burner for feeding and burning pellet and a
combustion process regulator. The manufacturer used modern solutions and the innovative
technology of overpressure combustion which eliminates the problem of back burning. Such
solutions improve the combustion process and cause lower fuel consumption, and help to maintain a
comfortable temperature in heated rooms. Burner installation and connection of central heating
system devices to the regulator and the boiler should be performed by the manufacturer or
authorized and trained service technician of the manufacturer.
There is a warranty for the boiler. The detailed warranty terms are specified in this manual and the
attached warranty card.
The boiler is a heating device in which, despite numerous technical safety features as well as
recommendations and information on safe use, there is always a potential risk of getting burned and
fire. Therefore, the user should always keep the basic safety rules in mind and be particularly careful
before taking any action.
Manuals and declarations of compliance of the feeder, controller, and other devices constituting the
boiler equipment are an integral part of this Operation and Maintenance Documentation.
1.2. General terms of use and warranty conditions
SlimKo Plus boilers are designed for installation in closed rooms - boiler rooms. The use of boilers for
other purposes and ways of use not in accordance with the Operation and Maintenance
Documentation is not allowed. Boilers should be used, operated, and repaired only by adults. Persons
operating boilers of over 50 kW must have valid permissions to operate them (Regulation of the
Minister of Economy, Labor and Social Policy of April 28, 2003, Journal of Laws of 2003, No. 89, item
828). The user is responsible for the operation and safety obligations, and should meet all the
requirements specified in the Operation and Maintenance Documentation. In order to commission the
boiler, carefully read the operating instructions for the burner, controller, and other equipment in order
to understand the specifics of their operation, and strictly follow the provided terms of use. Accident
prevention regulations and all basic occupational health and safety regulations must always be
observed.
WARNING!
Disturbances and irregularities in the operation of the boiler resulting from ignorance of the provisions
of the Operation and Maintenance Documentation are not subject to a complaint.
In particular:
- incorrect selection of the boiler size for the building being heated,
- incorrect installation of the boiler and central heating system,
- using the wrong fuel (type, granulation, calorific value),

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- protection in the open-loop system of the boiler not compliant with PN-91/B-02413
- protection in the closed-loop system of the boiler not compliant with PN-EN 12828
- use of a non-compliant chimney,
- failure to perform cleaning and maintenance works on the boiler,
- mechanical damage,
- improper boiler room ventilation,
- failure to perform annual boiler inspections by the factory service.
1.3. Delivery specification
The boiler is delivered as a compact of the body, the fuel bin, and equipment. The body of the boiler is
connected to the equipment and sheathed with mineral wool thermal insulation, covered with a
protective jacket of steel sheet constituting the aesthetic housing of the boiler. An integral part of the
boiler is a pellet burner, fuel bin, pellet feeder, control device, the Operation and Maintenance
Documentation, and warranty cards.
The completeness of the delivery consists of:
- boiler body –heat exchanger with complete insulation
- fuel bin
- pellet burner - type: PellasxX Revo
- pellet feeder
- fan integrated with burner
- controller –type: PLUM ecoMAX 860P4-PE / EcoMAX 860P4-PE Touch / TECH ST 9764 (P1)
- automatic air vent with foot valve
- analog capillary thermometer
- boiler operation tools
- operating instructions for boiler and components
- cover over the flue to protect electric wires
- set of wires and sensor for the boiler controller
When securing the boiler in a closed-loop system with an expansion vessel, additional equipment in
the set is used (optional):
- safety valve –type: 1915 with a pressure of 2 bar or 3 bar depending on the operating pressure of
the boiler; boiler power up to 44 kW
- thermal protection –type: SYR 5067
1.4.Transport of the boiler
When transporting the boiler, it should be secured against moving on the platform of the vehicle using
straps, wedges, and wooden blocks attached to the platform of the vehicle. The boiler should be
transported in an upright position, small boilers preferably on pallets. Lifting and lowering the boiler
should be done by means of transport handles and slings using mechanical lifts and cranes.

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2. DESCRIPTION AND PURPOSE
SlimKo Plus type central heating water boilers for solid fuels equipped with a pellet burner and a high-
class system of automatic regulation and control of the combustion process. They are intended for
central heating systems in various types of facilities and domestic hot water production. They have
been designed and manufactured as boilers with the low heat output and are intended mainly for small
buildings and single-family houses. They can work in gravity or pump systems.
The boilers guarantee much higher comfort of use in comparison to traditional boilers, due to the use
of an automatic fuel feeding system and automatic firing up process. The modern design of the heat
exchanger ensures very high thermal efficiency at a small size, and the use of renewable fuels helps
to protect the natural environment. As fully automatic boilers, they are an economical alternative to
both gas, oil, and coal boilers.
3. TECHNICAL AND OPERATING FEATURES.
SlimKo Plus boilers meet the latest European and national regulations, which set very high
requirements when it comes to the emission and efficiency of boilers. The ecodesign requirements
apply to the boiler load at nominal power - 100% and minimum power - 30%. Thermal and emission
parameters at low load are very important because boilers during the heating season are loaded on an
average level of 50%. It is also important to pay attention to the high and constant efficiency of over
90% in operation at nominal and minimum load. High efficiency is at the level of gas and oil boilers,
which is an alternative for them at the current prices of fuel.
The boilers have a simple integrated design. The operation of the boiler is simple and easy due to the
use of an automatic and controlled fuel feeding system, which allows for, among others, smooth
adjustment of the boiler heat output and obtaining the outlet water temperature according to your
needs. The basic operation is limited to controlling, loading fuel to the bin, and removing small
amounts of ash.
4. SELECTING BOILER FOR THE HEATING SYSTEM
For the correct selection of the boiler, the calculated heat demand due to transmission losses as well
as the heat for ventilation and domestic hot water needs to be taken into account. The heat balance of
the building should be developed by the designer in accordance with the applicable standards.
WARNING!
The manufacturer is not responsible for the incorrect selection of the boiler.
4.1.Heat demand for residential buildings.
To determine the estimated heat demand for heating of the residential building, the average values of
the following heat demand rates can be used.
- q=90-120W/m² - for buildings with medium insulation (walls made of autoclaved aerated concrete,
multi-layer without thermal insulation, double windows)

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- q=80-60W/m² - for well-insulated buildings (insulated walls made of autoclaved aerated concrete,
insulated windows with multiple glazed panels, "warm" floors).
5. TYPES OF FUEL
The basic fuel used in SlimKo Plus boilers is a pellet. After each change or delivery of fuel, it is
absolutely necessary to carry out the so-called "FEEDER TEST" (for more details see feeder manual)
It has a significant impact on the proper and trouble-free operation of the device.
Detailed requirements regarding the quality and properties of pellet fuel are specified in the manual of
the burner used for the boiler.
The burner should only be operated with fuel with the following properties:
Fraction
granulate
Diameter
6±1mm, 8±1mm
Length
3,15 mm ÷ 40 mm
Amount of dust
≤ 1%
Bulk density
≥ 600 kg/m³ –700 kg/m³
Dampness
≤ 12%
Calorific value
> 17 MJ/kg
Ash
≤ 0,5%
When choosing fuel, particular attention should be paid to the possible content of mechanical
impurities in the fuel in the form of stones or other non-flammable inclusions deteriorating the quality of
the combustion of fuel from uncertain sources. Pellets must be delivered and transported in conditions
of absolute dryness. Due to the dampness of granules, they lose a lot of quality, and it's very difficult to
burn. Pellet should be stored in dry rooms, and it should be insulated against external factors.
WARNING!
Use only fuel (pellets), the type and properties of which are specified in the manual of the burner
(Operation and Maintenance Documentation) that was delivered with the boiler. In the case of using
lower-quality fuels, the user may have difficulties when it comes to burning, and the efficiency of the
boiler will be lower. Using lower-quality fuel may also cause premature destruction of the boiler and
burner. The boiler is not intended for burning waste and other types of fuel.
6. DESIGN DESCRIPTION
he boiler is made of several modules - the body of the heat exchanger, fuel bin, burner with fuel feeder
as well as controller, and thermal insulation, which all create an integral device.

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The body has a box design and is made in a bent-welded version, which reduces the number of
welded joints that affect the tightness of the product. It consists of a furnace with an ash pan and a
convection part and is additionally equipped with a door, a flue, nozzles, and an ash drawer. The
furnace and ash pan constitute one chamber in which a burner with a spiral fuel feeder is located,
together with a drive and a fan. Above the body, there is a fuel bin in which the controller is built-in.
The feeder's task is to supply fuel to the burner head and combustion in the furnace.
There is an ash pan under the burner, into which the ash slides. The air necessary for the combustion
process is supplied by a blower fan connected to the burner and supplies the air into the fuel zone.
The controller regulates the operation of the boiler and the fuel feeding system. Directly around the
furnace, there is a convection part - a heat exchanger. The convection part is connected to the flue via
a vertical convection duct. The design and dimensions of boilers are shown in Fig. 3, and Fig. 4. The
boiler design allows for cleaning the heat exchange surfaces, furnace, ash pan, ducts through the
furnace, and ash pan doors as well as cleaning the convection lines periodically. All closed hatches
are heat-insulated doors or covers. The boiler also has thermal insulation.
The mechanical and feeder drive parts are covered and do not put the safety of the user at risk. The
boiler at the outlet of the boiler works under negative pressure.
Furnace
The furnace consists of a combustion chamber and an ash pan. Around the combustion chamber,
there is a water jacket in which the flame tubes are located.
At the front of the furnace, there is a furnace door to which the burner is mounted.
Convection part
The convection part consists of a horizontal pipe heat exchanger located in the water space above
and on both sides of the furnace, which is one of the convection lines. The flue gas from the
combustion chamber flows in flame tubes to the vertical channel with the reversing chamber at the
back of the boiler and then to the flue. The reversing chamber has a partition - a swirler made of steel
sheet, which slows down and change of the direction of the flue gas flow and works as a settling
chamber. he structure of the heat exchanger consisting of several sections results in a developed heat exchange
surface. Changing the direction and speed of flue gas flow affects the precipitation of thicker volatile
fractions (dust) and reduces their emission into the environment. As a consequence of this solution, a
properly directed flue gas circulation influences the intensification of heat exchange and the high
efficiency of the boiler.
Front door
The front door is located at the front of the boiler, and they are closing the entire space of the furnace,
ash pan, and convection part. A burner is mounted in the door. The door has handles for safe opening
and ensures tightness when closed. Opening the front door allows access to the burner and the
internal space of the boiler (furnace, ash pan, flame tubes), which makes it easy to operate, clean the
furnace and remove ash and other impurities that are left after burning and cleaning the boiler.

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WARNING!
It is not allowed to open the furnace door when the boiler is working. The limit switch, which interrupts
the boiler work after opening the furnace door, was installed for this purpose.
Clean-out hatch
The clean-out hatch is located on the back of the boiler in the area of the reversing (settling) chamber.
The clean-out hatch with a partition works as a flue gas swirler. After opening the clean-out hatch, we
can clean the settling chamber.
Thermal insulation and housing
Thermal insulation and housing are made of mineral wool placed in steel sheet cassettes, either
coated or painted on both sides, ensuring a safe temperature of the external surface and a closed
housing and an aesthetic appearance.
Flue
The flue is located in the upper part of the boiler, and it is the element that is connecting the boiler with
the chimney. The outlet from the flue as a standard is cylindrical and directed to the back.
The flue for safety reasons may not have a fumes damper.
Nozzles
The boiler has threaded supply and return nozzles as well as drain and measuring nozzles. The boiler
has 2 supply nozzles at the top and 2 return nozzles at the bottom, led out from the back of the boiler
on the left and right side, to be used depending on the needs. In the upper part of the boiler, there are
control and measurement nozzles of a temperature sensor, STB.
Burner with feeder
The burner with the feeder is mounted in the door at the front of the boiler. The feeder's task is to feed
fuel from the bin to the burner head located in the furnace. The fuel is fed through a special spiral
feeder driven by a gear motor.
The pellet burner used is characterized by:
- safety when it comes to temperature control and back burning
- combustion system reliability
- modern control system when it comes to firing up, flame control using power control.
Fuel bin
The fuel bin is located directly above the boiler. It is made of steel sheet and shaped in a way to
ensure that the fuel slides down. It is closed with a tight cover, protected against accidental closing by
gas cylinders. The fuel bin is connected to the body with the use of 4 connectors, which, when

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installing the boiler, are leading it to the right place. This connection is protected by a front cover that
masks the electrical components of the boiler and protects the bin from sliding against the body. The
bin has a fuel level view window. Keep the right fuel level of at least 1/4 of the bin's capacity.
Microprocessor controller
The microprocessor controller is mounted in the front in the housing of the boiler. Using the system of
sensors installed in the boiler and the burner, it controls the fuel feeder operation, according to the
boiler water temperature set by the user in accordance with the current demand and not exceeding the
allowed value specified in the operating manual. The regulator is also equipped with sensors for the
emergency shutdown of the boiler in case of an emergency.
The regulator is a modern electronic device designed to control the operation of the boiler, taking into
account the specificity of pellet combustion.
It can control the operation of the direct central heating circuit, the domestic hot water circuit, and the
operation of several heating circuits. The preset temperature of heating circuits can be set based on
weather sensor readings.
The possibility of cooperation with room thermostats, separate for each heating circuit, contributes to
maintaining the comfortable temperature in heated rooms.
The controller is operated in an easy and intuitive way.

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6.1. Assembly of the pellet feeder.
a) view of the bin with cover
b) view of the bin without front cover
RURA SPIRO- SPIRAL PIPE, PODAJNIK –FEEDER, OSŁONA PRZEDNIA – FRONT COVER, USZCZELKA
–SEAL –MOCOWANIE - MOUNTING

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6.2. Types of boiler safety features
The controller is equipped with emergency sensors and shuts down the boiler and signals
emergencies with light or sound signals on the desktop in the event of:
- exceeding the max. water temperature in the boiler,
- lack of fuel shuts down the entire system and extinguishes the burner,
- reversion of flame/ember makes it impossible to feed fuel to the burner,
The STB thermal protection is a water temperature limiter, which is making sure that the water
temperature is not exceeded by shutting down the boiler completely when the maximum allowed
temperature is reached. After the use of STB protection, the limiter can only be restarted manually,
which conditions are restarting the boiler and its further operation. If the burner is restarted, it is
necessary to check the reason for the shutdown caused by the boiler overheating, assess it, and take
appropriate action to eliminate the cause.
6.3. Safety systems of the burner
The burner is equipped with the following safety systems that effectively protect the user against back
burning. The primary safety features include:
- burner temperature sensor, which after detecting the heating medium temperature above 70°C, goes
from operating mode to shutting down mode, turning off the external feeder and setting the fan to
100% power.
- flexible loading pipe, which is an elastic connector between the external feeder and the burner itself.
Its main task is to supply fuel to the burner; in addition, it also has the function of protection against the
back burning. High temperatures may result in the burning of the pipe, preventing further feeding of
fuel.
- a charging chimney with a counterbalance barrier closes the fuel inlet opening, cutting off the fire
from the fuel bin.

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7. CONNECTING BOILER TO HEATING SYSTEM
Before connecting the boiler to the heating system, carefully read the operating instructions and check
if all components are working and the boiler is fully equipped and complies with the delivery
specification. SlimKo Plus boilers should be installed in accordance with the Operation and
Maintenance Documentation of the boiler, boiler room design, requirements for ventilation and flue
gas discharge, and the quality of boiler feed water. The location and equipment of the boiler room
should comply with the standards for "Solid fuel boiler rooms".
WARNING!
For the system to be safe, all boiler installations should be made with special care, using the current
state of knowledge and technology in accordance with recognized engineering practice. The boiler
must only be secured:
- according to PN-91/B-02413 –open-loop system
- according to PN 12828 –closed-loop system.
7.1. Place of installation
Transporting the boiler to its place of installation, due to its size and weight, should be carried out with
extreme caution. To move the boiler, pipes laid on the floor can be used. The action should be
managed by one responsible person, preferably an experienced installer, who will install the boiler.
This person should be obliged to choose the method and organization of the boiler positioning and
installation. If necessary, you may remove the burner and bin that are located on the body of the
boiler.
The way of moving and positioning the boiler should be adapted to the conditions of a room and
surface, obstacles, inclines, etc. Particular attention should be paid to the safety of legs and arms and
the possibility of the boiler tipping over. The boiler basically does not require a foundation, and it is
allowed to place the boiler directly on a non-flammable floor. It is recommended that the boiler is
installed on the platform, a plinth approx. 5÷10 cm above the floor. The boiler should be carefully
leveled, and the strength of the ceiling and the floor on which it is placed should be checked for the
weight of the boiler with water. The boiler should be placed on a floor made of non-flammable
materials.
WARNING!
The boiler should be easily accessible from all sides, especially from the front of the boiler and from
the side of the boiler, so that objects or walls of the building surrounding the boiler do not obstruct fuel
loading, cleaning of the burner, furnace, ash pan, convection ducts and removal of soot. Remember
that the bin should be removed when cleaning the rear duct.

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One of the conditions for good operation of the boiler is a sufficient supply of fresh air. Therefore the
boiler room should have appropriate gravitational vents above the floor and under the ceiling –inlet
and outlet of air. The room in which the boiler is located should meet the ventilation requirements for
this type of facility and comply with regulations and standards.
WARNING!
Mechanical flue gas ventilation is not allowed in the boiler room.
7.2. Flue installation
Introduction
The correctly selected chimney system and its diameter have a direct impact on the safety of use of
the device and its proper and economic functioning.
It is absolutely necessary to use solutions, and chimney systems with valid approvals, which should be
provided by the supplier or manufacturer of the chimney system.
At this moment, in accordance with the applicable requirements of the Construction Law, each
chimney system should have the CE marking, and the manufacturer is obliged to issue a Declaration
of Performance. CE marking and declaration guarantee that the solution meets the basic requirements
for the safety of use, health protection, and environmental protection.
Choosing a chimney system solution
Modern SlimKo Plus devices from Kotłospaw, due to their high efficiency, have a very low flue gas
temperature and require chimney systems capable of operating in wet mode, which are characterized
by low water absorption. Flue gas discharge to a traditional brick channel can quickly lead to its

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destruction and condensate seepage through the chimney walls, which can cause problems with the
operation of the boiler.
It is recommended to use steel or ceramic system chimneys capable of operating in wet mode, having
high resistance to condensate.
If an existing chimney is used, it must be protected against the destructive effects of condensate with
a steel insert. It should be checked if the cross-section of the existing chimney allows the installation of
an insert with an appropriate diameter to guarantee the proper functioning of the SlimKo Plus boiler.
The insert must be insulated along its entire length with an insulation thickness of at least 20mm. An
air-insulated system chimney can be used, which is characterized by the small size and low weight.
The chimney must be dry and must be thoroughly cleaned before installation.
If you do not have the appropriate shaft, use an external steel chimney or system chimney with a
ceramic internal duct that can be built inside or outside the building.
Steel chimneys must have approvals based on PN-EN 1856 standard, while chimney systems with
ceramic ducts must have approvals based on PN-EN 13063 standard.
The chimney system used should have:
- minimum temperature class of T200,
- minimum tightness class of N1,
- W-class condensate resistance
- corrosion resistance class minimum 2 for ceramic chimneys and V2 for steel chimneys,
WARNING ! for steel chimneys, class V3 is recommended.
Choosing the diameter.
Choosing the correct diameter of the chimney system is the basis for the proper functioning of the
boiler. It should be noted that both too small and too large diameter may negatively affect the
combustion process. If the diameter is too small, the flue gas will be cumulating in the combustion
chamber, preventing proper combustion. In some cases, this problem can be eliminated by installing a
flue gas suction fan.
If the diameter is too large, it will cause the formation of a very high chimney draft, which will
significantly increase chimney losses, and in drastic cases, may cause the flame to burst from the
burner. In this case, it is worth installing a chimney draft regulator.
The optimal diameter should be chosen based on PN-EN 13384-1 Chimneys - Thermal and fluid
calculation methods. - Part 1: Chimneys serving one combustion appliance. The best solution is to use
available computer programs working based on the requirements of this standard.
When choosing, pay attention to the chimney system used, its vertical course, as well as the length
and components of the flue.
It is not allowed to connect more than one device to one chimney duct.
The table below shows the optimal diameters for an insulated chimney insert of the indicated height,
with a 1-meter flue with one bend at an 87 degrees angle.

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In case of a chimney system deviating from the indicated parameters, calculations should be made
according to PN-EN 13384-1
Height of vertical
part 8 linear meters
Height of vertical part
10 linear meters
Height of vertical part
12 linear meters
Boiler
12 kW
160mm
150mm
150mm
16 kW
160mm
150mm
150mm
20 kW
160mm
150mm
150mm
25 kW
180mm
160mm
160mm
30 kW
180mm
160mm
160mm
Guidelines for flue gas discharge system
All guidelines are based on the requirements of the Regulation of the Minister of Infrastructure of April
12, 2002, on the technical conditions to be met by buildings and their location. Journal of Laws 2002
No. 75 item 690.
Chimney caps
In the areas of strong winds in wind load zones II and III, defined by Polish Standards, caps should be
installed at the duct outlets. In other areas, it is recommended to install caps when the chimney is
located next to an obstacle building element. It is not allowed to use chimney caps that reduce the
chimney draft.
Going above the roof
The outlets should be led above the roof to a height that protects against the wind in a following way:
ofor flat roofs with an angle of a roof slope not exceeding 12 degrees, regardless of the roof
structure, the outlets should be at least 0.6m higher than the ridge or edge of the building in
case of recessed roofs.
ofor steep roofs with an angle of roof slopes above 12 degrees and the roofing is:
a) easily flammable, the outlets should be at least 0.6m higher than the level of the ridge,
>0,6m

19
b) non-flammable or difficult to set on fire, the outlets should be at least 0.3m higher than the
roof surface and at least 1.0m away measured horizontally from this surface
c) p
r
z
y
location of the chimney next to the element of building which will be an obstacle
(shield/cover) for the proper operation of the ducts, their outlets should be additionally:
-above the surface led out at an angle of 12 degrees down from the level of the highest
obstacle (cover) for chimneys located at a distance of 3 to 10m from this obstacle
(cover) for chimneys located at a distance of 1.5 to 3.0m from the obstacle
-at least 0.3m higher than the upper edge of the obstacle (cover) for chimneys located
within 1.5m of this obstacle.
>1m
>0,3m
Pokrycie niepalne,
niezapalne lub trudnozapalne
>0,3m
<1,5m
1,5m < x < 3,0m
3,0m < x < 10,0m
>0,3m
>0,6m
Pokrycie

20
Vertical flue system
The duct routing should be vertical. A deflection from the vertical direction of not more than 30
degrees is allowed. Provided the inspection holes with a tight door are installed the duct deflections, it
is allowed to deflect the duct by up to 45 degrees from the vertical direction, the length of the duct in
the direction deflected from the vertical should not exceed 2m.
Equipmment of the vertical flue system
The duct must be equipped with an inspection hole with a tight door, and a condensate
drain/discharge system.
Requirements for the flue/connection of the flue gas discharge part
The flue connecting the device with the vertical duct should be led along the shortest route, with the
lowest possible number of bends and arches. You cannot change the direction of the flue gas flow
directly on the boiler. The first bend should be about 30cm behind the boiler. All bends of a 90-degree