ATTACK SLX20 User manual

W W W . A T T A C K . S K
THE WOOD GASIFYING BOILER
ATTACK® SLX
PROFI / LAMBDA TOUCH
INSTRUCTIONS FOR USE

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CONTENT
1  INTRODUCTION...................................................................................................................................................5 
1.1  GENERAL DESCRIPTION............................................................................................................................5 
1.2  DESCRIPTION OF MARKINGS OF THE ATTACK SLX BOILERS ........................................................6 
1.3  SAFETY............................................................................................................................................................6 
1.4  IMPORTANT INFORMATION ....................................................................................................................6 
1.5  TECHNICAL DESCRIPTION........................................................................................................................7 
1.6  FUEL.................................................................................................................................................................8 
1.6.1  WOOD....................................................................................................................................................8 
1.6.2  ALTERNATIVE FUELS..........................................................................................................................8 
2  TECHNICAL PARAMETERS OF ATTACK SLX BOILERS...............................................................................9 
3  DIMENSIONS AND MAIN PARTS OF THE ATTACK® SLX BOILERS................................................................ 10 
4  PURPOSE OF USE .............................................................................................................................................11 
5  ASSEMBLY AND INSTALLATION OF THE BOILER ................................................................................... 12 
5.1  MANIPULATION WITH BOILER............................................................................................................. 12 
5.2  GENERAL CONDITIONS OF INSTALLATION ..................................................................................... 12 
5.3  BOILER PLACING....................................................................................................................................... 12 
5.4  CONNECTION OF THE BOILER TO THE HEATING SYSTEM ..........................................................14 
5.4.1  USE OF ANTIFREEZE MIXTURE .................................................................................................... 14 
5.4.2  PROTECTION AGAINST CORROSION.........................................................................................14 
5.4.3  OUTFALL OF THE FLUE OUT OF THE BOILER.......................................................................... 15 
5.4.4  CONNECTION OF THE BOILER TO THE CHIMNEY.................................................................. 15 
5.4.5  CONNECTION TO THE ELECTRICITY MAINS............................................................................ 16 
5.4.6  OPTION AND THE WAY OF CONNECTION OF THE CONTROL AND SAFETY ELEMENTS ......... 16 
5.4.7  PROTECTION OF THE BOILER AGAINST OVERHEATING......................................................17 
5.4.8  CONNECTION TO THE ACCUMULATION TANKS...................................................................18 
5.4.9  SCHEMES OF BOILER CONNECTION TO THE ACCUMULATION TANKS ......................... 19 
5.4.10  STANDARDLY DELIVERED ACCUMULATION TANKS ATTACK*.........................................22 
5.5  BINDING NORMS FOR DESIGNING AND ASSEMBLY OF THE BOILERS.................................... 23 
6  BOILER OPERATION.........................................................................................................................................24 
6.1  OPERATING PRESCRIPTIONS................................................................................................................ 24 
6.2  HEATING UP, OPERATION AND FUEL REFILLING...........................................................................25 
6.2.1  PROTECTIVE TOOLS FOR WORK WITH THE BOILER.............................................................. 30 
6.3  CONTROL OF THE ATTACK SLX PROFI BOILER ...............................................................................30 
6.3.1  ADVANTAGES OF REGULATOR...................................................................................................30 
6.3.2  BASIC DESCRIPTION OF THE REGULATOR ..............................................................................31 
6.3.3  CONNECTION OF THE PROFI PID REGULATOR BY HYDRAULIC SCHEMES...................32 
6.3.4  REGULATOR CONTROL AND OPERATING MODES ............................................................... 37 
6.3.5  SETTING THE USER PARAMETERS ..............................................................................................37 
6.3.6  SETTING THE SERVICE PARAMETERS ........................................................................................39 
6.3.7  DESCRIPTION OF PARAMETERS..................................................................................................40 
6.3.8  ERROR MESSAGES...........................................................................................................................43 
6.3.9  DISASSEMBLY OF THE REGULATOR.......................................................................................... 44 
6.3.10  TECHNICAL SPECIFICATION OF THE REGULATOR................................................................44 
6.3.11  SETTING THE AIR FLAPS AND FLUE GAS TEMPERATURE ................................................... 44 
6.4  ATTACK SLX LAMBDA TOUCH BOILER CONTROL ......................................................................... 46 
6.4.1  BASIC CONTROL ELEMENTS ........................................................................................................ 46 
6.4.2  THE REGULATOR WAY OF WORK:..............................................................................................47 
6.4.3  DESCRIPTION OF MAIN CONTROL MODES:............................................................................ 48 
6.4.4  STARTING UP THE REGULATOR..................................................................................................50 
6.5  DISPLAYING THE INFORMATION ........................................................................................................53 
6.5.1  SETTING THE PARAMETERS..........................................................................................................54 

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6.5.2  LEVEL OF SETTING THE BASIC PARAMETERS .........................................................................55 
6.5.3  LEVEL OF SETTING THE ADVANCED PARAMETERS..............................................................56 
6.5.4  SPECIFIC SETTINGS .........................................................................................................................60 
6.5.5  CONNECTION TO THE INTERNET................................................................................................ 61 
6.5.6  SOFTWARE UPDATE .......................................................................................................................62 
6.5.7  FACTORY SETTINGS AND RESET................................................................................................. 62 
7  RISK ANALYSIS ..................................................................................................................................................63 
8  BOILER MAINTENANCE ..................................................................................................................................65 
8.1  BOILER CLEANING....................................................................................................................................66 
8.2  INSTALLATION AND REPLACING OF FIREPROOF PARTS............................................................. 67 
9  TRANSPORT, MANIPULATION AND STORING.........................................................................................68 
9.1  INSTRUCTIONS TO PRODUCT DISPOSAL AFTER TERMINATION OF ITS LIFE-TIME.............68 
9.2  WRAPPING DISPOSAL............................................................................................................................. 68 
9.3  ACCESSORIES ............................................................................................................................................69 
10  POSSIBLE FAILURES AND THE WAY OF ITS REMOVAL......................................................................... 69 
11  CHARACTERISTIC OF TEMPERATURE SENSORS ..................................................................................... 70 
12  ELECTRICAL SCHEMES.................................................................................................................................... 71 
12.1  ATTACK SLX PROFI .................................................................................................................................. 71 
12.2  ATTACK SLX LAMBDA TOUCH............................................................................................................. 72 
NOTES............................................................................................................................................................................ 73 

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1INTRODUCTION
Dear customer,
thank you for your trust and purchase of our product – wood gasifying boiler ATTACK SLX. We wish it
serves you reliably for a long time. The reliable and correct function of device is related to its opera-
tion and therefore it is necessary to read this user manual. The manual is written with respect to the
correct function of the boiler.
The correct function of the boiler particularly depends on the following:
choice of the correct boiler output and type
perfect commissioning
correct operation
regular professional maintenance
reliable service
1.1 GENERAL DESCRIPTION
Name: Wood gasifying boiler ATTACK SLX 20, 25, 30, 35, 40, 45, 50, 55
In version „PROFI“, „LAMBDA Touch“
Type: ATTACK SLX 20, 25, 30, 35, 40, 45, 50, 55
Max. operation pressure: 250 kPa
Electr. power supply: 230 V/50 Hz/10 A
Elektr. input: 20, 25, 30, 35 SLX – 42 W
40, 45, 50, 55 SLX – 78 W
Fuel: Dry wood with calorific value 15 up to 17 MJ/kg, moisture 12 up to
20 %, diameter 80 up to 150 mm
Nominal output: 20, 25, 30, 35, 40, 45, 50, 55 kW
Gasifying boiler ATTACK SLX is intended for economical and ecological heating of the family
houses, cottages, small plants, workshops and similar objects.
Prescribed fuel for ATTACK SLX is dry wood logs or chopped pieces with length according to the
type of the boiler.
Water temperature in cooling circuit has to be 8–12 °C. Water pressure is fixed: 0,25 MPa min.
and 0,6 MPa max.
ATTACK SLX boilers work in non-condensation operation. Behind the chimney connection work
in overpressure operation.
Level of the acoustic pressure A does not exceed 70 dB (A).
Immediate peak value of the acoustic pressure C does not exceed 63 Pa.
Producer ATTACK, s.r.o. reserves the right of technical changes of products without previous notification.

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1.2 DESCRIPTION OF MARKINGS OF THE ATTACK SLX BOILERS
ATTACK SLX 20
Profi
25
LAMBDA
Touch
30
35
40
45
50
55
Wood gasifying boiler
Boiler output
Version type
1.3 SAFETY
In this manual are used following warning symbols for ilustration of the danger importance and
important safety notifications:
CAUTION!: Immediate danger situation and it could lead to the serious health or prop-
erty damage if the right steps are not taken. Take the action according to the instruc-
tions!
WARNING: Dangerous situation might occur. It could lead to the serious health or prop-
erty damage if the right steps are not taken. Work with extreme caution!
NOTICE: Dangerous situation might occur. It could lead to the serious health or property
damage if the right steps are not taken.
1.4 IMPORTANT INFORMATION
Boiler is delivered with documents and components in the feeding chamber, because of that,
please ensure before first heat up, that the feeding chamber is empty.
Assembly, checking heat up and training of the operation is performed by the assembly
technician who is trained by the producer and s(he) also fill protocol about the boiler installa-
tion.
During the gasification, tar and condensates (acids) are created in the fuel tray. That is why
the mixing device has to be installed behind the boiler, to ensure the minimum temperature
of the backflow water to the boiler 65 °C. Operation temperature of the water in the boiler
has to be in range of 80–90 °C.
Boiler must not be operated constantly in the output range lower than 50 %.
Ecological operation of the boiler is by the nominal output.
That is why we recommend to install the boiler with accumulation tanks and mixing device,
what ensures 20–30 % fuel saving and longer lifetime of the boiler and chimney with more
comfortable operation.

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We recommend to connect the boiler with accumulation tank with minimum volume of 70 l
to 1 kW boiler output.
Use only dry fuel with 12–20 % moisture (with higher fuel moisture is decreased boiler out-
put and increases its consumption)
Right choice of the boiler size, i.e. its heat output, is very important condition for economical
operation and correct function of the boiler. Boiler has to be chosen according to its nominal
output, which must meet the heat losses of the heated object.
WARNING: Boiler might be used only for intended purpose and only in the way de-
scribed in this manual.
CAUTION!: After the boiler disconnection from electricity mains during the operation,
burning continues in the sustain mode. Do not open the boiler door until the tempera-
ture drops below 40 °C.
The boiler warranty is not valid, if:
Is not operated with prescribed fuel
In the system is not installed the mixing device ATTACK – OVENTROP, which ensures the
backflow water temperature to the boiler at least 65 °C during the operation
Functional thermostatic valve wont be installed at the aftercooling circuit of the boiler (e.g.
WATTS STS20) and then connected to the source of the cooling water.
Boiler is not installed according to the requirements stated in this manual, e.g. correct di-
mensions of the chimney etc.
Is not sufficiently cleaned according to the instructions given in this manual
This appliance is not intended for use by persons (including children) with physical, sensual or
mental disability or insufficient experience due to which they are not able to use the device in a
safe way without being supervised or instructed about the boiler operation by the person re-
sponsible for their safety. Do not to allow children to play with this appliance.
If the power supply cable is damaged, it must be replaced with the correct type of
the cable, which is available by producer or by a service technician!
Be careful during the work with this appliance! Lambda probe works by high tem-
peratures (300 °C) and you might get burned during careless manipulation!
1.5 TECHNICAL DESCRIPTION
Boiler is constructed for wood combustion, based on the gasifying with use of exhaust fan,
which makes forced flow in the boiler and sucks the flue gas out of the boiler. Boiler body is
made as the weld from steel plates of 6 mm thickness. In the upper part of the boiler is feeding
chamber with above-standard volume, equipped with dry sheath technology, which lowers the
condensate creation and prolong lifetime of the boiler. In the bottom part of the feeding cham-
ber is fireproof nozzle with longitudinal hole for crossing the wood gas to the combustion
chamber. Secondary air is brought by the nozzle and after mixing with wood gas creates burn-
ing in the combustion chamber. Combustion chamber is also the ashtray, where are collected
wastes after combustion (ash). In the rear part of the boiler body is tubular exchanger equipped
with turbulators, which serves for cleaning the exchanger and increasing the boiler efficiency.
Turbulators might be controlled manually or automatically (using engine) according to the
boiler version PROFI or LAMBDA Touch. In the upper part of the boiler is situated boiler regula-
tion, which controls the wood gasification process and offers all important information about

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the boiler operation. Flue gas suction by the feeding is solved by the exhaust canal in the upper
part of the combustion chamber and leads directly to the chimney – go around the exchanger.
Boiler is designed for long period of combustion (4 up to 8 hrs, depending on the output) and
that is why it needs to be equipped with accumulation tank.
1.6 FUEL
1.6.1 WOOD
In the ATTACK SLX boiler is possible to use soft and hard chopped fuelwood with calorific value
in range of 15 to 17 MJ/kg. Ideal are especially beech, oak, fir, spruce, pine, popolar tree, alder,
willow, birch, ash tree, hornbeam, locust tree, always with moisture in range of 12 up to 20%.
Suitable diameter of logs is in range of 80 up to 150 mm. Maximal lenght of the logs must not
exceed 680 mm for 20, 25, 30, 35 SLX boilers and 780 mm for 40, 45, 50, 55 SLX boilers to prevent
wood jam in the feeding chamber.
Calorific value of particular types of wood:
Units
Wood Kcal/kg
MJ/kg
kWh/kg
Spruce 3 900 16,25 4,5
Pine 3 800 15,80 4,4
Birch 3 750 15,50 4,3
Oak 3 600 15,10 4,2
Beech 3 450 14,40 4,0
WARNING: Unsuitable moisture or size of the wood might cause lowering or increasing
the output, low or high temperature of the flue gas, excessive condensation, flame loss
of the gasifying process or uncontrollable combustion.
Recommended wood storing and drying:
Hard wood: stored in dry environment for 2 years
Soft wood: stored in dry environment for 1 year
Wood must be secured against rain during storage (drying). You can help to the wood drying
effectiveness by storing the wood with as large as possible spaces between each piece of wood
to let the air flow between them. It is good to store the wood in the environment with air
draught, what ensures faster drying. If possible, store the wood at least 1 day in the warm place
(e.g. boiler room – wood will be preheated and it will lead to the combustion effectiveness) be-
fore feeding in the boiler.
1.6.2 ALTERNATIVE FUELS
It is possible to use also wood briquettes with hole, pressed from wood sawdusts without any
additional connective materials. It is necessary to mix wood briquettes with wood in particular
ratio (ratio depends on the size and shape of the briquettes), to prevent clogging of the nozzle
for wood gasifying.
WARNING: Fuels, which are not allowed increase demands on cleaning and lead to the
accumulation of aggressive sedimentation and condensation. In the end, it might lead to
lowered functionality, boiler damage and invalid warranty. Use of unallowed fuels might
lead to incorrect and uncontrollable combustion.

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2TECHNICAL PARAMETERS OF ATTACK SLX BOILERS
Parameter / Boiler type SLX20 SLX25 SLX30 SLX35 SLX40 SLX45 SLX50 SLX55
Nominal output of the boiler kW 20 25 30 35 40 45 50 55
Output range kW 10–20 12,5
–
25
15–30 17,5–35 20–40 22,5–45 25–50 27,5–55
Area of the exchanger m² 2,95 3,32
Volume of the feeding chamber dm³ 200 230
Dimensions of the feeding hole mm 235 × 445
Prescribed chimney draugh
t
Pa 23
Prescribed chimney draugh
t
mbar 0,23
Max. working overpressure of the water kPa 250
Pressure loss of the water (ΔT 10K) kPa 1,9 2,1 2,4 2,7 3,9 4,5 5,2 6,1
Pressure loss of the water (ΔT 20K) kPa 0,8 0,9 1,2 1,6 1,9 2,1 2,4 3,2
Weight of the boiler kg 570 650
Diameter of the flue gas outlet mm 150
Height of the boiler mm 1 472
Width of the boiler mm 703
Depth of the boiler mm
1 337
1 506
Depth of the feeding chamber mm 690 790
Diameter of the riser pipe "E" "
G 6/4"
G 2"
Diameter of the reverse "F" "
G 6/4"
G 2"
Protection class IP 21
Electrical input at the nominal output W 42 42 42 42 78 78 78 78
Electrical input at the minimal output W 31 31 31 31 52 52 52 52
Electrical input at the standby mode W < 15 < 15 < 15 < 15 < 15 < 15 < 15 < 15
Boiler efficiency % 91,8 91,6 90,3 90,4 90,3
Boiler class — 5
Temperature of the flue gas by the nominal
output °C 165 170 175 180 165 170 170 180
Temperature of the flue gas by the minimal
output °C 130 135 140 145 135 140 140 145
Mass flowof the flue gas by the nominal
output kg/s 0,018 0,02 0,021 0,023 0,027 0,029 0,031 0,033
Mass flow of the fluegas by the minimal
output kg/s 0,008 0,011 0,014 0,016 0,017 0,021 0,022 0,023
Max. noise level dB 65
Class and type of the fuel — A, Wood pieces with relative moisture o
f
12 % – max. 20 %, Ø 50–150 mm
Average wood consumption kg/h 5,2 6,5 7,8 9,1 10,4 11,7 13 14,3
Indicative consumption of the wood per
season — 1 kW = 1 m
3
Max. length of logs mm 650 750
Time of burning by nominal output * h 8 7,2 6,5 5,8 6 5,1 4,6 4
Volume of the water in the boiler l 117 136
Recommended volume of the accumulation
tank l 1500 2000 2200 2500 3 000 3 200 3 500 4 000
Voltage V/Hz ~230/50
Range of the setting the temperature of the
heating water °C 65 ÷ 85
Capacity of the contacts of the boiler regula-
tor (PROFI version) — 2 A/~230 V
*depending on the type of fuel and perfection of the feeding the chamber with wood
Producer ATTACK, s.r.o. reserves the right of technical changes of products without previous notification.

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3DIMENSIONS AND MAIN PARTS OF THE ATTACK® SLX BOILERS
Dimensions of the boilers with output of 20–35 SLX:
Dimensions of the boilers with output of 40–55 SLX:
SLX20 SLX25 SLX30 SLX35 SLX40 SLX45 SLX50 SLX55
Riser pipe – „E“ G 6/4" G 6/4" G 6/4" G 6/4" G2" G2" G2" G2"
Reverse – „F“ G 6/4" G 6/4" G 6/4" G 6/4" G2" G2" G2" G2"

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CAPTION:
1. Body of the boiler 6. Cleaning covering 11. Aftercooling circuit 16. Lambda fuse
2. Door of the feeding chamber 7. Lever of turbulators 12. Rotary chimney 17. Emergency thermostat
3. Door of the combustion chamber 8. Manometer 13. Release valve 18. Main switch Lambda
4. Primary air 9. Regulator of the boiler 14. Reverse 19. Control case
5. Secondary air 10. Riser pipe 15. Fan
4PURPOSE OF USE
Ecological warm water boiler Attack SLX is intended for heating family houses and other similar
objects. Boiler is constructed for combusting wood pieces. It is possible to use any dry wood,
especially wood logs for combustion. Boiler is not intended for combustion of the sawdusts and
small wood wastes. It is possible to combust it only in small quantity (max. 10 %) together with
wood pieces. Massive fuel feeder replaces and removes hardest operation during the wood
preparation and its chopping to smaller pieces.
Placing boilers in dwelling premises (including corridors) is inpermissible!

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5ASSEMBLY AND INSTALLATION OF THE BOILER
5.1 MANIPULATION WITH BOILER
Boiler is delivered on the pallet. Perform manipulation
with boiler only at the pallet. Put down the boiler form
the pallet immediately at the place of installation. It is
possible to perform this by use of manipulation cart or
by crane and handles, which are welded at the ex-
changer of the boiler.
Figure 1Manipulation with boiler with use of the
welded handles
5.2 GENERAL CONDITIONS OF INSTALLATION
Only a person with valid authorization for installation and assembly of the heating technology
devices can install the boiler. The installation requires an appropriate project that is in line with
valid prescriptions. Technician must check the boiler before installing, if data given on the pro-
duction label are in conformity with data in the project and the documentation attached to the
boiler. The boiler connection must be in line with the valid prescriptions, norms, regulations and
this instruction manual.
WARNING: Producer takes no responsibility for damages caused by wrong connection
or operation!
5.3 BOILER PLACING
Boiler serves for installation and operation in the space with the basic environment (AA5/AB5)
according to STN 33 2000-3.
Boiler room must meet the following requirements:
Boiler is not suitable for use in the potentially explosive environment.
The temperature in the boiler room must not drop below the freezing point.
Boiler does not provide any lighting. Customer must ensure sufficient light source according
to the local norms and regulations.
It is necessary to consult the installation with the producer, if the boiler will be installed at
height above sea level exceeding 1 800 m.
Boiler room must have sufficient ventilation and inlet of the required burning air (minimally
10 cm
2
/kW of the boiler output). Hole for the ventilation should be designed to not let the
outside weather influence its function. (rain, snow, wind)

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During the installation of the boiler must be ensured a safe distance of its surface from the
flammable materials depending on their flammability level:
Materials of flammability level B, C1 a C2 200 mm
Materials of flammability level C3 400 mm
Level of flammability was not proved according to STN 73 0853 400 mm
Examples of building materials division according to the level of flammability:
Level of flammability A not flammable (bricks, breez blocks, ceramic tile, mortar, plaster)
Level of flammability B partly flammable (heraclit, lignos, board made out of basaltic felt, novodur)
Level of flammability C1 hard flammable (broadleaf wood (beech, oak), plywood, werzali, hardened
paper)
Level of flammability C2 intermediate flammable (coniferous wood (pine, spruce), chipboard, so-
lodur)
Level of flammability C3 easily flammable (wood-fibre, polyurethan, PVC, soft foam, polystyrene)
The sealing board or protection covering (on the protected object) must exceed the boiler edge
at least for 300 mm. Also other items from flammable materials must be protected in this way, if
they are placed near the boiler and it is not possible to keep the safe distance.
If the boiler stands on the flammable surface, it must be protected by an inflammable, heat insu-
lating mat, which exceeds the ground plan on the side of the feeding door and ash tray door for
at least 100 mm. All materials of the flammability level A might be used as an inflammable, heat
insulating mat.
Boiler must be placed in a such way, ensuring sufficient space of at least 1 m from the front and
0,5 m from the left (right) and rear side. It is necessary to leave the space of at least 1 m above
the boiler.
This space is necessary for basic operation, maintenance and eventual service of the boiler. It is
not allowed to place the boiler in dwelling premises (including corridors).
WARNING: Items from flammable materials must not be laid on the boiler and in the
distance shorter than the permitted (safe) one. The boiler must be put out of operation,
if there is a danger of fire or explosion during the work (e.g. work with painting materi-
als, glues, etc.).

14
5.4 CONNECTION OF THE BOILER TO THE HEATING SYSTEM
Boiler ATTACK® SLX has to be installed in the system, which meets the requirements of the heat-
ing water quality as follows:
Country Number of standards Country Number of standards
Slovak republic STN 07 7401:1991 Switzerland SWKI 97-1
Austria ONORM H5195-1 Italy D.P.R. no. 412
Germany VDI 2035
For filling or refilling the water in the system might be used only water which is adapted for val-
ues according to STN 07 7401: 1992. Water has to be clear, colourless, without any suspended
substances, oils and chemical agressive additives and cannot be acidic (pH has to be higher than
7,2). Water hardness cannot exceed 1 mmol/l and concentration of Ca²Ѐ0,3 mmol/l.
NOTICE: The warranty of the boiler is not valid in case of infringement of these conditions!
5.4.1 USE OF ANTIFREEZE MIXTURE
It is not recommended to use antifreeze mixture with not suitable quality for the boiler opera-
tion. It is related especially to lowering the heat penetration, big volume expandability, aging,
rubber parts damage. If necessary, use the Alycol Termo (manufacturer Slovnaft Bratislava) anti-
freezing mixture – according to experiences of producer, there is no risk of lowering the safety of
use and noticeable influencing of the boiler work. If this type of protection against freezing is not
achievable in particular conditions, parameters are not fulfiled or there are some boiler failures
caused by use of other antifreezing mixtures, there is no possibility of warranty.
5.4.2 PROTECTION AGAINST CORROSION
Boiler must be connected with device for controlling the tempera-
ture of the boiler reverse. Suitable solution is use of mixing device
ATTACK-OVENTROP (Figure 2), which makes the temperature rise
of the return connection to acceptable level. In this way is boiler
protected against supercooling below 65 °C and creation of the
water steams, acids and tars in the feeding chamber is lowered.
Mixing device ATTACK-OVENTROP allows to set temperature of
return-water in range of ca. 50–70 °C thanks to the thermostatic
head.
Figure 2Device for protection of the reverse temperature AT-
TACK OVENTROP
NOTICE: If the device against corrosion is not installed in the system or this device does
not work properly, there is a possibility of creation of agressive condensate, which might
lead to the boiler damage. Protection against condensation must be in use during the
boiler operation, otherwise is warranty provided by producer not valid!
Use of the size of ATTACK OVENTROP devices depending on the boiler output:
ATTACK OVENTROP DN25: SLX 20–35 kW
ATTACK OVENTROP DN32: SLX 40–55 kW

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5.4.3 OUTFALL OF THE FLUE OUT OF THE BOILER
Flue has to have outfall to the chimney hole. If it is not possible to connect the boiler to the
chimney hole directly, then the appropriate extension should be as short as possible, of up to 1
m length, without any additional heating area and it must ascend to the chimney. It is good to
insulate the flue, to achieve sufficient flue gas temperature and prevent the chimney condensa-
tion. Flues must be mechanically firm (it is recommended to attach the flue to the boiler and bolt
them together) and tight against the flue leakage and cleanable inside. Flues must not lead
through the somebody else's dwelling or commercial premises. The internal diameter of the flue
must not taper in direction to the chimney. It is not eligible to use the elbow connectors. There
must be an „T-shaped“ connection between flue and chimney to let the condensate flow down
to the intended container and not in the boiler.
5.4.4 CONNECTION OF THE BOILER TO THE CHIMNEY
Connection of the appliance to the chimney hole must be always done with permission of the
appropriate chimney sweep association. The chimney hole must always generate sufficient
draught and take the flue gas out into the atmosphere under the all operating conditions.
Correct dimensions of the chimney hole are important for correct boiler function, because burn-
ing, output and boiler life-time are influenced by the draught. The chimney draught directly de-
pends on its diameter, height and roughness of the internal wall. It is not allowed to connect any
other appliance to the chimney, where is the boiler connected. Diameter of the chimney must
not be smaller than the outlet part of the boiler. Chimney draught must achieve prescribed val-
ues. It cannot be too high to not decrease the boiler output and interrupt the burning (flame). If
there is too strong draught, install the throttle flap into the chimney hole between the boiler and
the chimney.
Figure 3Correct and incorrect parameters of the chimney for connection the SLX boiler
Prescribed values of the chimney diameter and height:
20 × 20 cm min. height 7 m
20 cm min. height 8 m
15 × 15 cm min. height 11 m
16 cm min. height 12 m

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Exact dimensions of the chimney determines STN 73 42 10. Prescribed chimney draught is stated
in Technical parameters. Chimney draught is measured by the devices intended for this opera-
tion, minimally 40 cm behind the outfall of the chimney. Draught is measured during the boiler
operation at full output, by the same temperature of flue gas as the set one.
In case, that your chimney does not achieve prescribed parameters of the chimney, it is possible
to install additional fan ATTACK PV150 behind the boiler, which is able to make required pa-
rameters of the chimney.
It is necessary to keep in mind by choosing the type of the chimney or during the boiler opera-
tion, that stainless insulated chimney (most of the time placed externaly at the sheathing of the
building) has the best qualities of the chimney draught beginning after heat up, because it is
quickly warmed in a whole lenght. Chimney with stainless insertions has worse qualities of the
chimney draugh beginning, because it is warmed slower than insulated chimney. Worst qualities
of the chimney draught beginning has chimney without insertions (e.g. brick or ceramic), be-
cause its accumulation to operation temperature takes much longer. So, if the heat up or boiler
start up is problematic, consider recontruction of the chimney and equipping the chimney with
stainless insertions.
5.4.5 CONNECTION TO THE ELECTRICITY MAINS
The boiler is connected to the electricity mains of 230 V/50 Hz/10 A by an electrical cord with
plug. The mains input is type M and by replacing, it must by replaced with the same type by the
service organisation. Appliance must be placed with easy reach of the plug. The boiler must be
connected to the plug circuit with 10 A electrical circuit-breaker (following the STN EN 60 335-1
+ A11:1997).
5.4.6 OPTION AND THE WAY OF CONNECTION OF THE CONTROL AND SAFETY
ELEMENTS
Boiler is delivered with basic equipment, regulation and control elements. It is necessary to pur-
chase other elements, which are not a part of delivery, but have to be installed in the heating
system. It is especially, valve against exceeding permitted pressure (figure 4) in the heating sys-
tem (we prescribe 2,5 bar), valve of the aftercooling loop of the boiler for draining excess
warmth out of the boiler to the waste and bleeding valve for correct function of the boiler. Ex-
pansion tank in the system must have sufficient volume, which is set by the project architect of
the heating system according to valid prescriptions. Electrical installation with sufficient equip-
ment of the boiler has to be performed by the specialist according to valid norms.
CAUTION! Heating system has to be equipped with safety
valve against exceeding pressure in the boiler (2,5 bar). We
recommand to place this valve on the riser pipe of the boiler,
always infront of the closing valve of the boiler (or infornt of
the OVENTROP). If the safety valve would not be func-
tional, excessive pressure would not be able to leak and
boiler might explode!
Figure 4Safety valve against overpressure

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5.4.7 PROTECTION OF THE BOILER AGAINST OVERHEATING
Every gasifying boiler has to be equipped with functional aftercooling circuit. It is possible to
order correct valve for ensuring this function, as accessory. In the figure 5 you can see correct
installation of the aftercooling circuit valve.
CAUTION! Cooling circuit against boiler overheating can not be used according to the
EN 303-5 norm for other purposes as is the boiler protection against overheating.
Valve at the inlet of cooling water to the cooling circuit of the boiler has to be permanently
opened and cooling circuit of the boiler has to be connected to functional distribution of cold
water (e.g. to distribution of cold water of the water network) of 10–15 °C temperature and op-
erating overpressure 2–6 bar, which ensures safety operation even by electricity failure.
Thermostatic valve at the inlet of aftercooling circuit, which has sensor placed at the rear part of
the boiler, protects the boiler against overheating. If the water temperature in the boiler rises
above 95 °C, valve releases water from the water network in the cooling circuit which takes away
excessive warmth. In case of boiler overheating and opening a thermostatic valve, permanent
drain of warmed water from the cooling circuit of the boiler to the waste, has to be ensured.
Functionality of the aftercooling circuit and thermostatic valve might be also checked manually,
with the manual button of the thermostatic valve.
Figure 5The way of cooling circuit connection
CAUTION! If the circulation of cooling water through the aftercooling circuit would not
be ensured during the opening of thermostatic valve, there is a danger of boiler damage.
In this case is warranty not valid!

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5.4.8 CONNECTION TO THE ACCUMULATION TANKS
System of the connection is based on warming the accumulation tanks, where is the accumu-
lated warmth from accumulation tanks gradually drained according to the requirements of
heated space. During the bioler operation at full output are accumulation tanks warmed at 80–
90 °C. Heating with accumulation tanks in connection with ATTACK SLX boiler brings several
advantages. Main advantages are higher efficiency, lower fuel consumption, prolonged lifetime
of the boiler, more frequent operation, minimal creation of acids and condensates, higher com-
fort, lower risk of boiler overheating and fuel saving.
Recommended volume of the accumulation tank for ATTACK SLX 25 boiler is 2000 l (for other
outputs see technical parameters). Boiler is able to produce 180 kWh of energy at one loading of
the hard wood to the feeding chamber (it is ca. 7 hours of operation at full 25 kW output). It cor-
respond to charge of 2 000 l accumulation tank from 20 °C to 90 °C if there is no energy offtake
(that is why is necessary to keep in mind by choosing the size of accumulation tank, that boiler
must be operated according to the size of accumulation tank. It means that, if you have 2000 l
tank, load the wood chamber fully. If you have 1000 l tank, load the chamber halfway – if there is
no energy offtake from the accumulation tank). If the accumulation tank is charged (bottom
temperature of the accumulation tank achieves 70 °C) and boiler achieved set boiler tempera-
ture, do not load the wood to the boiler. If you would load the wood to the boiler in this state,
wood would not be combusted (boiler has already achieved set temperature and fan has turned
off). It would get dry and condensates would create in the feeding chamber, what lowers boiler
lifetime. It is necessary to fill the wood at the time when the accumulation tank is almost dis-
charged.
Example 1:
Outside temperature of the environment is −5 °C and heat loss of the object is 10 kW by this
temperature. Boiler has 25 kW at the full output operation. Accumulation tank with volume
2000 l is discharged (its upper and bottom temperature is 20 °C). The heating system (to cover
heat loss) drains 10 kW output from accumulation tank and boiler has 25 kW output, accumula-
tion tank will be heated by the output of 15 kW – difference between them. 15 kW output makes
energy of 105 kWh by full loading of the chamber with hard wood and time of the operation ca.
7 hours. Energy of 105 kWh warms accumulation tank from 20 °C to 65 °C. It means, that this is
the safe economic operation without putting the boiler out of operation or draining excessive
warmth to the waste (boiler was cooled by the aftercooling circuit). Boiler is able to cover the
heat loss for up to 15 hours at one wood loading.
Example 2:
Outside temperature of the environment is +3 °C and heat loss of the object is 5 kW by this tem-
perature. Boiler has 25 kW at the full output operation. Accumulation tank with volume 2000 l is
discharged (its upper and bottom temperature is 20 °C). The heating system (to cover heat loss)
drains 5 kW output from accumulation tank and boiler has 25 kW output, accumulation tank will
be heated by the output of 20 kW – difference between them. 20 kW output makes energy of
140 kWh by full loading of the chamber with hard wood and time of the operation ca. 7 hours.
Energy of 140 kWh warms accumulation tank from 20 °C to 80 °C. It means, that this is the safe
economic operation without putting the boiler out of operation or draining excessive warmth to
the waste. If the heat loss of the object would be constant all the time – 5 kW, charged accumu-
lation tank would be able to cover heat loss for about 28 h, what is together with operation time
up to 35 hours without need of wood loading.
That is why it is necessary to keep in mind, that boiler should be loaded only with amount of
wood necessary for charging the accumulation tank, because pointless overheating might lead
to putting the boiler out of the operation or removing excessive warmth to the waste. This is
uneconomical and requires activation of the safety element – aftercooling loop.

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5.4.9 SCHEMES OF BOILER CONNECTION TO THE ACCUMULATION TANKS
Scheme č. 1. – Incorrect connection, where is the heating circuit connected by the T connector
infront of the accumulation tank
Scheme č. 2 – Correct connection of the gasifying boiler with accumulation tank, D.H.W. tank
and mixing heating circuits (radiator and flooring)

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Scheme č. 3 – Connection of the gasifying boiler with accumulation tank with spiral for solar
heating, D.H.W. tank, solar panels, mixing heating circuits (radiator and flooring) and automatic
boiler (e.g. gas)
Scheme č. 4 – Connection of the gasifying boiler with accumulation tank, D.H.W. tank with spiral
for solar heating, solar panels, mixing heating circuits (radiator and flooring) and automatic
boiler (e.g. gas)