ATTACK ATTACK DPX COMBI PELLET Series User manual

www.attack.sk
EN 07/2019
ATTACK DPX
COMBI PELET
Instructions for use
EN

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CONTENT
1  INTRODUCTION...................................................................................................................................................4 
1.1  GENERAL DESCRIPTION............................................................................................................................4 
1.2  IMPORTANT INFORMATION ....................................................................................................................5 
1.3  SAFETY............................................................................................................................................................6 
1.4  BOILER OPERATION....................................................................................................................................6 
1.4.1  PROTECTIVE EQUIPMENT FOR BOILER OPERATION........................................................................... 6 
1.5  FUEL.................................................................................................................................................................6 
1.5.1  WOOD ............................................................................................................................................................ 6 
1.5.2  PELLETS.......................................................................................................................................................... 7 
1.5.3  ALTERNATIVE FUELS................................................................................................................................... 7 
2  ASSEMBLY AND INSTALLATION OF THE BOILER ......................................................................................8 
2.1  MANIPULATION WITH THE BOILER .......................................................................................................8 
2.2  GENERAL CONDITIONS FOR INSTALLATION......................................................................................8 
2.2.1  BINDING NORMS FOR PROJECTING AND INSTALLATION OF THE.................................................. 9 
BOILERS.......................................................................................................................................................... 9 
2.3  PLACING THE BOILER.............................................................................................................................. 10 
2.4  BOILER CONNECTION TO THE HEATING SYSTEM.......................................................................... 11 
2.4.1  ANTIFREEZER USING.................................................................................................................................11 
2.4.2  BOILER PROTECTION AGAINST CORROSSION....................................................................................11 
2.4.3  CHIMNEY .....................................................................................................................................................12 
2.4.4  FLUE GAS CONNECTION..........................................................................................................................12 
2.4.5  BOILER CONNECTION TO THE ELECTRICITY MAINS .........................................................................12 
2.4.6  CONNECTION WITH EXTERNAL PELLET TANK AND PELLET FEEDER ...........................................13 
2.4.7  BURNER CONNECTION TO THE BOILER AND BOILER TEMPERATURE SENSOR .........................14 
2.4.8  CHOICE AND CONNECTION OF THE CONTROL AND REGULATION COMPONENTS .................14 
2.4.9  BOILER PROTECTION AGAINST OVERHEATING .................................................................................15 
2.4.10  CONNECTION TO THE ACCUMULATION TANKS................................................................................15 
3  TECHN. PARAMETERS FOR ATTACK DPX COMBI PELLET.................................................................... 17 
4  DIMENSIONS OF BOILER ATTACK DPX COMBI PELLET........................................................................ 18 
5  PURPOSE OF USE .............................................................................................................................................19 
6  TECHNICAL DESCRIPTION.............................................................................................................................20 
6.1  TECHNICAL DESCRIPTION OF ATTACK DPX COMBI PELLET ...................................................... 21 
6.1.1  OPERATING PRESCRIPTIONS..................................................................................................................21 
6.1.2  HEATING UP AND OPERATION ..............................................................................................................21 
7  OPERATION OF BOILER ATTACK DPX COMBI PELLET .......................................................................... 23 
7.1  OPERATION OF BOILER ATTACK DPX COMBI PELLET – WOOD MODE .................................. 24 
7.2  ADVANTAGES OF THE REGULATOR................................................................................................... 25 
7.3  BASIC DESCRIPTION OF THE REGULATOR.......................................................................................25 
7.4  CONNECTION OF THE REGULATOR BY HYDRAULIC SCHEMES.................................................26 
7.5  REGULATOR CONTROL AND OPERATING MODES........................................................................ 31 
7.6  SETTING THE USER PARAMETERS....................................................................................................... 31 
7.7  SETTING THE SERVICE PARAMETERS................................................................................................. 33 
7.8  DESCRIPTION OF PARAMETERS ..........................................................................................................34 
7.9  ERROR MESSAGES.................................................................................................................................... 37 
7.9.1  ERROR MESSAGES DISPLAYED ..............................................................................................................37 
7.10  DISASSEMBLY OF THE REGULATOR................................................................................................... 38 
7.11  TECHNICAL SPECIFICATION OF THE REGULATOR.........................................................................38 
7.12  OUTPUT CONTROL OF ATTACK DPX COMBI PELLET....................................................................38 

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7.13  OPERATION WITH PERMANENT BURNING ...................................................................................... 38 
8  BURNER ASSEMBLY TO THE BOILER .......................................................................................................... 39 
9  OPERATION OF BOILER ATTACK DPX COMBI PELLET – PELLETS MODE........................................ 40 
9.1  ATTACK PELLET BURNER AUTOMATIC 8–30 KW ........................................................................... 43 
9.2  ATTACK PELLET BURNER AUTOMATIC 15–50 KW......................................................................... 44 
9.3  BURNERS DIMENSIONS.......................................................................................................................... 45 
9.4  DESCRIPTION OF FUNCTION................................................................................................................ 46 
9.4.1  NORMAL START–UP IN STAND–BY MODE OF BURNER ..................................................................46 
9.4.2  BURNER START–UP, WHEN THERE IS STILL FIRE IN THE BURNER.................................................46 
9.4.3  BURNER START–UP, WHEN THE CONTROL SYSTEM DOES NOT RECOGNIZE THE FIRE...........46 
9.5  MENU AND FUNCTIONS ........................................................................................................................ 47 
9.5.1  INDICATIONS ON DISPLAY......................................................................................................................47 
9.5.2  MENU INDICATIONS.................................................................................................................................48 
9.6  PRODUCTION SETTINGS........................................................................................................................ 49 
9.6.1  ATTACK PELLET BURNER AUTOMATIC 8–30 KW ..............................................................................49 
9.6.2  ATTACK PELLET BURNER AUTOMATIC 15–50 KW............................................................................51 
9.6.3  HOW TO CHANGE PRODUCTION SETTINGS .......................................................................................52 
9.7  ADVANCED MENU................................................................................................................................... 52 
10  MAINTENANCE OF THE BOILER...................................................................................................................56 
10.1  BOILER CLEANING....................................................................................................................................57 
10.2  INSTALLATION AND REPLACEMENT OF THE FIREPROOF PARTS ............................................. 58 
11  TRANSPORT, HANDLING AND STORING .................................................................................................. 60 
11.1  INSTRUCTIONS FOR PRODUCT DISPOSAL AFTER TERMINATION OF ITS SERVICE LIFE.....60 
11.2  DISPOSAL OF THE PACKAGING........................................................................................................... 60 
11.3  ACCESSORIES ............................................................................................................................................60 
12  POSSIBLE ERRORS AND SOLUTIONS.......................................................................................................... 61 
12.1  CHARAKTERISTICS OF TEMPERATURE SENSORS........................................................................... 64 
13  ELECTRICAL SCHEMES.................................................................................................................................... 65 
13.1  ATTACK DPX 25, 30, 35 COMBI PELLET............................................................................................. 65 
13.2  ATTACK DPX 40, 45, 50 COMBI PELLET............................................................................................. 67 
14  RECOMMENDED SCHEMES OF CONNECTION........................................................................................ 69 
14.1  CONNECTION OF THE BOILER WITH 1 HEATING CIRCUIT WITH DHW.................................... 69 
14.2  CONNECTION OF THE BOILER WITH 1 HEATING CIRCUIT WITHOUT DHW.......................... 70 
14.3  CONNECTION OF THE BOILER WITH 2 HEATING CIRCUITS WITHOUT DHW........................71 
14.4  CONNECTION OF THE BOILER WITH 2 HEATING CIRCUITS WITH DHW ................................. 72 

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1INTRODUCTION
Dear customer,
thank you for your trust and purchase of our product – the ATTACK COMBI Pellet boiler. 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
•reasonable operation
•regular professional maintenance
•reliable service
1.1 GENERAL DESCRIPTION
Name: Water heated boiler ATTACK DPX 25, 30, 35, 40, 45, 50 COMBI Pellet
for wood and wood pellets
Type: ATTACK DPX 25, 30, 35, 40, 45, 50 COMBI Pellet
Max. operating pressure: 250 kPa
El. power supply: 230 V/50 Hz/10 A
El. input: 38 – 78 W
Fuel: Dry wood with heat value of 15 – 17 MJ/kg, moisture of 12 – 20 %,
diameter of 80 – 150 mm
Wood pellets ∅6 mm, l
max
= 35 mm
Nominal output: 25; 30; 35; 40; 45; 49,9 kW
Combi boiler ATTACK® DPX COMBI Pellet is intended for economical and ecological heating of
family houses, cottages, small plants and similar objects.

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1.2 IMPORTANT INFORMATION
•Installation, heat–up test and user training must be performed by the technician trained by
producer. The technician must fill the protocol about the installation of the boiler.
•By gasification of wood it comes to creation of tar and condensates (acids) in the fuel tank.
Due to this there must be a mixing device installed behind the boiler to keep the minimum
temperature of return water at 65 °C. The temperature of water in the boiler during its opera-
tion must be within the range of 80 – 90 °C.
•The boiler must not be permanently operated within the output lower than 50 %.
•If the circuit pump is being used, its operation must be controlled by a separate thermostat
to ensure the prescribed minimum temperature of the return water.
•Ecological boiler operation is related to its nominal output.
•It is recommended to install the boiler together with the accumulation tank and mixing de-
vice. This ensures the fuel saving of 20 – 30 % and longer lifetime of the boiler and chimney.
•If it is not possible to connect the boiler to the accumulation tank, it should be connected
with at least one equalization tank with the volume of approximately 25 l / 1 kW of the boil-
er´s output.
•By the operation with lower output (summer operation and D.H.W. preparation) it is neces-
sary to heat the boiler up every day.
•Only the dry fuel of 12 – 20 % moisture can be used (by the higher moisture of fuel is the
boiler output decreased and its consumption increased).
•Due to the economical operation and correct functionality it necessary to choose an appro-
priate boiler output. The nominal output of the boiler has to be adequate to the temperature
loss of the heated object.
WARNING! When the boiler works in PELLET mode, the primary and secondary air
flaps must be closed.
ATTENTION: The boiler must be used only for the purpose that it is intended for and
only in the way given in this manual.
The warranty for the boiler is not valid:
•if it is not operated with the prescribed fuel.
•if no mixing device Regumat ATTACK–OVENTROP is installed in the system to ensure the re-
turn water temperature of at least 65 °C during the boiler operation.
•if no functional thermostatic valve is installed on the aftercooling circuit (WATTS STS20) of
the boiler, connected to the cold water inlet.
This device is not supposed to be used 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 the children to play with the device.
If the power supply cable is damaged, it must be replaced with a special cable available by
producer or by a service technician!

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1.3 SAFETY
This manual uses the following warning signs to illustrate the severity of the impending danger
and important safety information:
WARNING!: Imminent dangerous situation, if not taken the right steps, may occur in se-
rious injury or property damage. Act under the above instructions!
CAUTION: There may be a dangerous situation and if not taken the right steps, can occur
in serious injury or property damage. Work with extreme caution!
ATTENTION: There may be a dangerous situation and if not taken the right steps, can
occur in serious injury or property damage.
1.4 BOILER OPERATION
ATTENTION: If entered the boiler room unauthorized persons, can occur in serious injury
or property damage. The system operator must ensure the boiler room for access by un-
authorized persons and especially children.
1.4.1 PROTECTIVE EQUIPMENT FOR BOILER OPERATION
By boiler operation, it is necessary to use protective equipment in accordance with established
rules on safety at work. Extra care must be taken to protect the health by operation, cleaning
and inspection of the boiler. It is necessary to wear gloves with increased heat resistance, suita-
ble clothing and sturdy shoes.
1.5 FUEL
1.5.1 WOOD
The ATTACK DPX COMBI Pellet can be used soft and hard chopped firewood with a heat value
15 – 17 MJ/kg. Ideal are especially beech, oak, fir, spruce, pine, poplar, alder, willow, birch, ash,
hornbeam, acacia, each with a moisture 12 – 20 %. A suitable diameter of the logs is 80 –
150 mm. The maximum length of the logs must not exceed 580 mm in order to prevent jam-
ming of the logs in the loading chamber.
Heat value of different type 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
ATTENTION: Wrong moisture or size of wood can be reduced or increased output, low or
high temperature of flue gas, excessive condensation, loss of flame by gasification or
uncontrollable combustion.

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Recommended storage and drying of wood:
Hard wood: 2 years stored in a dry place
Soft wood: 1 year stored in a dry place
Wood during storage (drying) must be protected against rain. Effective drying of wood can
help,that the wood will be saved with the largest possible air gaps. Then air can flow between
the pieces of wood. When drying there are places where wind operates for wood. It helps in
faster drying of wood. If it is possible, before loading of wood into the boiler, keep it at least one
day in a warm place such as a boiler room (this increases the combustion efficiency).
1.5.2 PELLETS
In the boiler can be used only pressed wood pellets without additional materials and the follow-
ing parameters:
Specification of pellets:
Specific weight: 600 – 750 kg/m
3
Heat value: 4,7 – 5,0 kWh/kg
Size/diameter: 6 mm
Size/length: Max. 35 mm!
Moisture max.: 12 %
Ash content: 0,5 – 1 %
Dust content: max. 3 %
Ash fusion temperature: min. 1 100 °C
Standards: DIN 51 731 – HP 5, DIN Plus, or EN 14961–2 – A1
1.5.3 ALTERNATIVE FUELS
In the boiler can be also used wood briquettes with a hole, pressed from wood dust without ad-
ditional connecting materials. Wood briquettes must always be mixed in a certain ratio together
with the log (the ratio depends on the size and shape of the briquettes) to prevent stoppage of
the nozzle for the gasification of wood.
ATTENTION: Illegal type of fuel increase demand for cleaning and lead to the accumula-
tion of aggressive sedimentation and condensation, which at the end can lead to re-
duced functionality, boiler damage and void warranty. The use of illegal fuel can cause
wrong and uncontrolled combustion.

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2ASSEMBLY AND INSTALLATION OF THE BOILER
2.1 MANIPULATION WITH THE BOILER
The boiler is delivered on pallet. Manipulation with the boiler always perform on the pallet. Only
if is boiler on installation place, remove the boiler from the pallet. This can be done with the help
of a handling truck or a crane and hanging ears, which are welded to the heat exchanger of the
boiler.
The way of boiler manipulation with welded ears
2.2 GENERAL CONDITIONS FOR INSTALLATION
Only a person with valid authorization for installation and assembly of the heat technology de-
vices can install the boiler. The installation requires an appropriate project that is in line with the
valid prescriptions and this instruction manual. Before installing the boiler must the technician
check, if the data given on the production label are in conformity with the data in the project
and the documentation attached to the boiler. The boiler must be connected in line with the
valid prescriptions, regulations and this instruction manual.
ATTENTION: The producer takes no responsibility for damages caused by wrong
connection or operation!

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2.2.1 BINDING NORMS FOR PROJECTING AND INSTALLATION OF THE
BOILERS
Boiler installation must meet the following norms:
STN EN 303–5:2012 Heating boilers for solid fuels
STN 73 42 10 Construction of the chimneys and flue connections
STN EN 60 335.1 +A11 Safety of the electrical appliances for household
STN EN 12828+A1 Heating systems in buildings. Design for water–based heating sys-
tems 
STN 06 08 30 Safety devices for central heating and D.H.W. preparation
STN 07 74 01 Water and steam for thermal energetic devices with operation pres-
sure of steam up to 8 MPa
STN 332000 4–46 Electrical installations of buildings – part 4: Ensuring safety
STN 33 2000–1:2009–04 Electrical installations of buildings – part 3: Definition of the basic
characteristics
STN EN ISO 11202 Acoustics. Noise emitted by machinery and equip-
ment.Determination of emission sound pressure levels at a work
station and at other specified positions applying approximate envi-
ronmental corrections (ISO 11202:2010)
STN EN ISO 12100 Safety of machinery.General principles for design.Risk assessment
and risk reduction (ISO 12100:2010)
STN EN ISO 14120:2016 Safety of machinery. Guards. General requirements for the design
and construction of fixed and movable guards
STN ISO 27574–2 Acoustics. Statistical methods for definition and verification of the
determined values. Noise emission of machines and devices. Part 2:
Methods for particular of machines.
STN ISO 1819 Continuous mechanical handling equipment. Safety code. General
rules.
STN EN ISO 15614–1 Requirements for quality of the fusion welding of metal materials
STN EN 287–1 Welding of reserved technical devices
STN 07 0240 Low pressure boilers, technical prescriptions
STN 07 0245 Warm water boiler with the output up to 50 kW. Technical require-
ments, testing

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2.3 PLACING THE BOILER
The boiler is intended to be installed and operated in the premises with the basic environment
(AA5/AB5) following the STN 33 2000–1:2009–04.
Boiler room must meet also the following conditions:
•The boiler room must not be potentially explosive environments, due to the fact that the
boiler is not suitable for use in such environments.
•The temperature in the boiler room must not fall below freezing point.
•Boiler provides no lighting. The customer must ensure sufficient light source according to
local standards and regulations.
•If the boiler will be installed at altitudes over 1 800 m, it is necessary to consulted this instal-
lation with the producer.
•The boiler room must be secured with a hole for good air circulation and also required inlet
for combustion air, but at least 200 cm
2
. The hole should be designed so that external
weather does not affect its function (rain, snow, wind).
By the boiler installation it is necessary to keep the safety distance of its surface from
flammable materials according to their degree of flammability:
•from materials of the flammability degree B, C1 and C2 200 mm
•from materials of the flammability degree C3 400 mm
•from materials of the flammability degree not approved 400 mm
Examples of classification of the building materials by their degree of flammability:
•degree of flammability A inflammable (bricks, blocks, ceramic tiles, mortar, parging)
•degree of flammability B partly flammable (heraklith, lignos, board from basalt felt, novodur)
•degree of flammability C1 difficult to ignite (hardwood (oak, beech), plywood, werzalit, hardened paper)
•degree of flammability C2 normal combustibility (softwood (pine, spruce), chipboard, solodur)
•degree of flammability C3 easily ignited (wood fibre boards, polyurethane, PVC, foam rubber, polystyrene)
The sealing board or protection covering (on the protected item) must exceed the boiler edge
for at least 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 a flammable surface, it must be protected by an inflammable, heat insulat-
ing mat, which exceeds the edge on the side of the feeding door and the ash tray door for at
least 100 mm. All materials of the A flammability degree can be used as an inflammable, heat
insulating mat.
The 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). There must be an
opening for the air inlet for burning of at least 200 cm
2
depending on the boiler output.
ATTENETION: The 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 turned off, if there is a danger of fire or explosion due to the work (e.g. work
with painting materials, glues, etc.).
It is not allowed to place the boiler in residential premises (including corridors)!

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2.4 BOILER CONNECTION TO THE HEATING SYSTEM
Boiler ATTACK DPX COMBI Pellet must be installed in system complying with the quality of heat-
ing water as follows:
Slovak Republic: STN 07 7401:1991
Austria: ONORM H5195–1
Germany: VDI 2035
Switzerland: SWKI 97–1
Italy: D.P.R. no. 412
Before installing the boiler, it is necessary to flush (to clean) the whole heating system. The sys-
tem can be filled only the water treated to the values under the STN 07 7401: 1992. The water
has to be clear, colorless, free of suspended substances, oil and chemically aggressive impurities
and must not be acidic (pH must be higher than 7,2).
Callosity of the water must not excess 1 mmol/l and concentration of the Ca²Ѐmust be lower
than 0,3 mmol/l.
ATTENTION: If these conditions are not kept, the warranty is not valid!
2.4.1 ANTIFREEZER USING
It is not recommended to use antifreezer because of their unsuitable properties for the boiler. In
particular, the reduction in heat transfer, large volume expansion, aging, damage rubber com-
ponents. In urgent cases, it is possible to use antifreezer Alycol Term (manufacturer Slovnaft Bra-
tislava) – according to the experience of the manufacturer, it could not be a decrease in the safe-
ty of use and significant effects on the boiler. Unless the specific conditions this method of frost
protection heating system feasible, non–performance functional parameters or any defects in
the boiler due to the use of other antifreezer, can not be addressed under warranty.
2.4.2 BOILER PROTECTION AGAINST CORROSSION
Use of the mixing device (Regumat ATTACK–OVENTROP) is
a suitable solution of the problem with corrosion. It enables
creation of the separate boiler and heating circuit. Thereby is
the boiler protected against undercooling below 65 °C and the
creation of water steams, acids and tars in the boiler´s feeding
chamber is eliminated.
The Regumat ATTACK–OVENTROP device keeps the constant
temperature of the return heating water flowing into the boiler
over 65 °C by setting the thermostatic head to the level 5 – 6.
When the individual thermal regulation mixing valve is used, it
is possible to control the temperature of the heating water in-
dependently on the temperature of water in the boiler by set-
ting the flap. The temperature in the boiler has to be kept in the
range of 80 – 90 °C.
ATTACK–OVENTROP

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ATTENTION: If is not installed in the system equipment against condensation, or the
equipment will not operate properly, can result in the formation of aggressive conden-
sate. It lead to boiler damage. Protection against condensation must be used during
operation of the boiler, otherwise it will void warranty by the manufacturer!
2.4.3 CHIMNEY
Connection of the appliance to the chimney hole must be always done with permission of the
appropriate chimney sweep association. The chimney must 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 the correct boiler function, because the
burning, output and boiler life–time are influenced by the draught. The chimney draught direct-
ly depends on its diameter, height and roughness of the internal wall. It is not allowed to con-
nect any other appliance to the chimney, where the boiler is connected. Diameter of the chim-
ney must not be smaller than the connection part on the boiler. The chimney draught must
achieve the prescribed values, but it cannot be too high, not to 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.
Prescribed dimensions of the chimney section:
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
The exact chimney dimension is defined by the STN 73 42 10. The prescribed chimney draught is
given in the Technical parameters.
2.4.4 FLUE GAS CONNECTION
The flue connection must lead into 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 should ascend in direction to the
chimney. The flue connection must be mechanically tight (it should be mounted to the boiler
and tightly fixed by screws) and tight against the flue leakage. The flue connections must to lead
through the foreign dwelling or commercial premises. The internal diameter of the flue connec-
tion must not taper in direction to the chimney. It is not suitable to use the elbow connectors.
Flue must be connected to a chimney T–shaped to drop condensate from the chimney into an
aimed container and not to the boiler.
2.4.5 BOILER CONNECTION TO THE ELECTRICITY MAINS
The boiler is connected to the electricity mains of 230 V/50 Hz/16 A by an electrical cord with
plug. In the case of need, the power supply cord of the M type must be replaced with an ade-
quate one by the service organization. The appliance must be placed in the way enabling to
reach the connection plug. The boiler must be connected to the 16 A socket circuit by a circuit
breaker (following the STN EN 60 335–1 + A11:1997).

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2.4.6 CONNECTION WITH EXTERNAL PELLET TANK AND PELLET FEEDER
To the boiler ATTACK DPX COMBI Pellet is recommend to use ATTACK pellet tank in combination
with screwed ATTACK pellet feeder, length about 2 m. Pellet tank is possible to place on the
right or the left side of the boiler, where necessary. For 30 kW burner there is recommend-
ed PED200 feeder. Feeder PED210 is recommended for 50 kW burner. Between hole of
feeder and delivery tube on the burner should be a height difference at least 300 mm. In the
horizontal direction should be space between the hole of feeder and delivery tube at least 150
mm (i.e. not vertically aligned).
Before first starting up of the burner it is necessary to make setting of feeder (p. 58). For setting
of the feeder it is necessary to load the pellet tank with sufficient amount of pellets and load the
pellet feeder with connection to the mains until the pellets begin falling down of the top hole of
the feeder. Connect the feeder to the burner outlet. After correct setting of the feeder, install the
inlet hose between the outlet tube of feeder and the delivery tube of burner and adjust the
length of the hose. The hose should not be straight and also not so bented to prevent the pellets
inside of stacking and accumulating.

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2.4.7 BURNER CONNECTION TO THE BOILER AND BOILER TEMPERATURE
SENSOR
Burner is connected to the boil-
er by cable with 6–pin connect-
or that comes from the feet of
the boiler, at the point where
pantograph arm is fixed. The
cable is necessary after assem-
bly to attach to the arm of the
pantograph by supplied plastic
tapes from the bottom of the
pantograph arms in a correct
distance so by manipulation of
the burner to prevent stretching
or strain of the cable. With the
cable is also connected the
boiler temperature sensor to
the arm of the pantograph. The
connector which is the sensor
completed, it is necessary to
connect in connector TS2 in
control electronic of burner.
2.4.8 CHOICE AND CONNECTION OF THE CONTROL AND REGULATION COM-
PONENTS
The boiler is delivered with the basic regulation and control equipment. These should be sup-
plemented by elements that are not part of the boiler delivery but must be installed in the heat-
ing circuit. They are mainly a safety valve (picture 4) against exceeding the allowable pressure in
the heating system (priecribe 2.5 bar), the valve of aftercooling circuit of the boiler to abduce
surplus heat from the boiler to the drain and vent valve for proper operation of the boiler. The
expansion tank in the system must have sufficient volume to be fixed by designer of heating
system under current regulations. Electric installation with the additional equipment of the boil-
er must be done by a specialist according to the current standards.
WARNING! The heating system must be equipped with
a safety valve against overpressure (2,5 bar). This valve is rec-
ommended to place on riser in front of shut–off valve of the boiler (or
before OVENTROP). If the safety valve will not be working, excess
pressure have nowhere to escape and the boiler may explode!
Safety valve against overpressure

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2.4.9 BOILER PROTECTION AGAINST OVERHEATING
Each gasification boiler must be equipped with functional
cooling circuit. The right valve to provide the feature can
be ordered as an accessory. The correct installation of the
cooling circuit valve can be seen in pic. on the right.
WARNING! Following the norm EN 303–5, the
aftercooling circuit against the boiler overheat-
ing must not be used for other purposes than
boiler protection against overheating.
The valve at the cold water inlet into the cooling loop
must be permanently open and the cooling loop of the
boiler must be connected to the functional cold water
distribution (e.g. to the cold water supply into the water
distribution network) with the temperature of 10 – 15 °C
and the operating overpressure of 2 – 6 bar. This valve also
ensure safe operation even in power cut.
The STS20 valve at outlet of the cooling loop with the sen-
sor placed in the rear part of the boiler protects the boiler in the following way. When the tem-
perature of water in the boiler exceeds 95 °C, then the water from the distribution network flows
into the cooling loop to absorb the surplus heat. In the case of boiler overheating and opening
the STS20 valve it is necessary to ensure the permanent outtake of the warmed water from the
boiler aftercooling circuit into the drain.
Functionality of aftercooling circuit and thermostatic valve can be tested each time manually,
with the manual button of the thermostatic valve.
WARNING! If the outtake of cooling water through the cooling loop is not ensured
after opening the STS20 valve, there is a danger of boiler damage! In this case is the
warranty for the boiler not valid!
2.4.10 CONNECTION TO THE ACCUMULATION TANKS
Connection system consists in heating of accumulation tanks heat. Accumulated heat of the ac-
cumulation tanks is gradually taken according to requirements into heated space. When is the
boiler operating at full output, the storage tanks are heated to 80 – 90 °C. Heating with accumu-
lation tanks in connection with the boiler ATTACK DPX COMBI Pellet brings several advantages.
Highlights include the longer boiler life, cleaner operation and minimal creation of acid and
condensate, less frequently of fuel loading, higher comfort, less possibility of overheating of the
boiler and lower fuel consumption.
Recommended capacity of accumulation tank for boiler ATTACK DPX COMBI Pellet is 50 l per
1 kW boiler output, the minimum capacity is 25 l per 1 kW boiler output. When choosing
a capacity of accumulation tank, it is necessary to have on mind that the size of the accumula-
tion tank affects on operation of the boiler. That means, we load the boiler regarding to the size
of accumulation tank to prevent overheating of the system.
Therefore is very important to have on mind that the boiler needs to be load always just with
enough wood, to heat up the accumulation tank, but not overheat. There may be to remove the
surplus heat to waste. This is uneconomical and requires activation of safety element – aftercool-
ing circuit.

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The bigger volume of the accumulation tank, the less risk of overheating. With the larger capaci-
ty of the accumulation tank is the loading time shorter.
Note:
It should be noted that the above is only relevant in the operation of boiler with WOOD.
In operation of PELLETS it loses meaning, the boiler need not be connected to the accumu-
lation tank, but the boiler have to operate always only with PELLETS.
The ATTACK accumulation tanks available*
AK AS HR HRS
TUV
TUVS S SS
200 200 — — — — — —
300 300 — — — — — —
400 400 — — — — — —
500 500 600 600 500 500 500 500
800 800 800 800 600 600 800 800
1000 1000 1000 1000 800 800 1000 1000
1500 1500 1250 1250 1000 1000 1250 1250
2000 2000 1500 1500 1250 1250 1500 1500
2500 2500 2000 2000 1500 1500 2000 2000
3000 3000 — — 2000 2000 — —
4000 4000 — — — — — —
5000 5000 — — — — — —
AK – standard accumulation tank designed for accumulation of heating water
AS – accumulation tank for accumulating of heating water, equipped with a heating coil for
connection to solar panels
HR – combined accumulation for accumulation of the heating water as well as for preparation
of the D.H.W. by an internal enameled exchanger
HRS – combined accumulation for accumulation of the heating water as well as for preparation
of the D.H.W. by an internal enameled exchanger, equipped with a heating coil for connection to
solar panels
TUV – accumulation tank for accumulation of the heating water as well as for the D.H.W. prepa-
ration in a water coil
TUVS – accumulation tank for accumulation of the heating water as well as for the D.H.W.
preparation in a water coil, equipped with a heating coil for connection to solar panels
S– accumulation tank with internal disk and stratification pipe (based on the type AK) that al-
lows layering of water as necessary (different water temperature on inputs as well on outputs)
SS – accumulation tank with internal disk and stratification pipe (based on the type AS and S),
equipped with a heating coil for connection to solar panels
* It is possible to cover required volume for required accumulation of energy by one or several accu-
mulation tanks. Accumulation tanks can be connected together to create required volume of accu-
mulation water. Therefore, if you decided that your accumulation volume will be 2 000 l, you can buy
a single accumulation tank of 2 000 l or two accumulation tanks with a capacity of 1 000 l and con-
nect them together.

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3TECHN. PARAMETERS FOR ATTACK DPX COMBI PELLET
Parameter / Boiler type Jedn. DPX25CP DPX30CP DPX35CP DPX40CP DPX45CP DPX50CP
Nominal
output
WOOD kW 25 30 35 40 45 45
PELLETS 30 30 30 40 45 49,9
Outout
range
WOOD kW 12 – 25 15 – 30 17 – 35 20 – 40 22 – 45 22 – 45
PELLETS 8 – 30 8 – 30 8 – 30 15 – 49,9 15 – 49,9 15 – 49,9
Area of exchanger m² 2,52 2,52 2,78 2,78 3,03 3,03
Volume of feeding chamber l 125 125 158 158 190 190
Dimensions of the feeding opening mm 235×445 235×445 235×445 235×445 235×445 235×445
Prescribed chimney draught Pa 23 23 23 23 23 23
Max. operating overpressure of water kPa 250 250 250 250 250 250
Pressure loss of water (
Δ
T 10 K) kPa 2,3 2,3 4,4 4,4 6,6 6,6
Pressure loss of water (
Δ
T 20 K) kPa 0,7 0,7 1 1 1,8 1,8
Boiler weight kg 480 480 510 510 540 540
Diameter of flue connection mm 150 150 150 150 150 150
Boiler height mm 1 240 1 240 1 240 1 240 1 240 1 240
Boiler width mm 760 760 760 760 760 760
Boiler depth – „C“ with burner mm 1 510 1 510 1 610 1 610 1 765 1 765
Boiler depth with cover of upper door mm 1 250 1 250 1 350 1 350 1 425 1 425
High of the outlet flue – "D" mm 985 985 985 985 985 985
High of ventilator – "E" mm 751 751 751 751 751 751
Depth of chamber mm 590 590 690 690 790 790
Protection of el. parts IP 21 21 21 21 21 21
Electrical
input
WOOD
W
38 102 102 102 102 102
PELLETS – on ignition 600
PELLETS 96 160 160 190 190 190
Stand–by mode <5
Boiler effi-
ciency
WOOD % 90,4 90,1 90,1 90,2 90,2 90,2
PELLETS 90,8 90,5 90,2 90,6 90,5 90,2
Boiler class WOOD – 5
PELLETS 5
Flue gas temperature by nominal
output – wood °C 165 170 185 170 180 185
Flue gas temperature by nominal
output – pellets °C 145 152 168 148 155 164
Flue gas temperature by minimal
output – pellets °C 109 116 129 110 119 126
Flue gas flow by nominal output kg/s 0,018 0,02 0,022 0,025 0,028 0,029
Flue gas flow by minimal output kg/s 0,005 0,007 0,009 0,012 0,014 0,015
Maximum noise level dB 65 65 65 65 65 65
Prescribed
fuel
WOOD –
Dry wood with the heat value of 15 – 17 MJ/kg,
water content min. 12 % – max. 20 %, ∅80 – 150 mm
PELLETS –
Wood pellets, ∅6 mm, l = 35 mm, humidity up to 12 %,
according to standards: DIN 51 731 – HP 5, DIN Plus, or EN 14961–2 – A1
Fuel con-
sumption
WOOD Kg/h 6,5 7,8 9,1 10,4 11,75 11,75
PELLETS 2,4 – 6,9 2,4 – 6,9 2,4 – 6,9 3,4 – 12,5 3,4 – 12,5 3,4 – 12,5
Consumption of wood per season 1 kW = 1 m
3
Maximum length of wood logs mm 550 650 650 750 750 750
Burning time by nominal output hod 4 4 4 4 4 4
Volume of water in the boiler l 100 110 110 128 128 128
Minimum volume of accumulation
tank l 625 750 900 1 000 1 200 1 200
Connection voltage V/Hz 230/50
Min. temperature of return water °C 65
Range of setting the temp. of heating water °C 65 – 90
Capacity of contacts of the boiler regulator V/A 230/2
Connection to the heating system " G6/4" G2"
Producer, the ATTACK, s.r.o., reserves right to make technical changes of products without the previous announcement!

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4DIMENSIONS OF BOILER ATTACK DPX COMBI PELLET
DPX 25CP DPX 30CP DPX 35CP DPX 40CP DPX 45CP DPX 50CP
Flow connection „B“ G 6/4" G 6/4" G 6/4" G 2" G 2" G 2"
Return connection „A“ G 6/4" G 6/4" G 6/4" G 2" G 2" G 2"
KEY DPX COMBI Pellet:
1. Boiler body 5. Pantograph 9. Inlet tube for pellets 13. Pull rod of the chimney flap
2. Pellet burner 6. Console 10. Lever for exchanger cleaning 14. Aftercooling circuit
3. Cover of boiler door 7. Upper boiler door 11. Suction fan 15. Flow connection
4. Boiler controller 8. Bottom boiler door 12. Flue gas opening 16. Return connection
Pull rod of the chimney flap – serves to close and to open the heat up flap (always by opening
the feeding door)
Lever for exchanger cleaning – serves to clean the holes of the exchanger

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5PURPOSE OF USE
The ecological warm water boiler ATTACK DPX is intended for heating the family houses and
other similar objects. The boiler is designed only for the use of wood logs. Any type of dry wood
can be used, especially the wood logs. It is also possible to use the blocks of wood with larger
diameter – then is the boiler output lower, but the time of burning is longer. The boiler is not
suitable to burn the saw dust and small wooden waste. Only small amount (approximately 10 %)
of such a material can be used together with the wood logs. Thanks to the voluminous feeding
chamber it is not necessary to do the most demanding work with wood – chopping into smaller
pieces.
WARNING! It is not allowed to operate with the boiler on both fuels at the same
time. It is never allowed to heat with wood until the burner is in upper loading door
of boiler and also is not allowed to heat with pellets if the wood is in loading cham-
ber of boiler! It is also not allowed to use the pellet burner to ignite the wood. Dur-
ing the boiler operation with wood, it is always necessary to use the upper door
cover!