Astra G-18 E User manual

HEATING BOILERS
Astra G-18 E
Astra G-25 E
Astra G-32 E
Astra G-40 E
ASTRA MACHINERY PLANT AB • ANNO 1929
CONTACT INFORMATION OF THE FACTORY:
MACHINERY PLANT“ASTRA”AB
ULONŲ G. 33, LT-62161 ALYTUS, LITHUANIA
TEL.: [phone]
FAX: [phone]
E-MAIL: [email protected]T
WWW.ASTRA-GAS.LT
INSTALLATION AND OPERATION MANUAL

TABLE OF CONTENTS
1. SAFETY REQUIREMENTS.................................................................................. 3
2. TECHNICAL DESCRIPTION................................................................................ 4
• General View of the Boiler................................................................................................................... 4
• Technical Data of the Boiler................................................................................................................. 5
• Ceramic Elements of the Boiler............................................................................................................ 6
• Turbulence Plates................................................................................................................................ 6
3. INTENDED USE............................................................................................... 7
4. TRANSPORTATION, STORAGE, UNPACKING ........................................................ 7
5. INSTALLATION............................................................................................... 8
• Accumulation Tank.............................................................................................................................. 8
• Description of the Emergency Cooling System Diagram....................................................................... 8
• Description of the House Heating System Scheme............................................................................... 8
• Requirements for Connection of the Boiler to the Heating System .................................................... 10
• Circuit Diagram of the Boiler.............................................................................................................. 11
• Connection of the Circulation Pump .................................................................................................. 12
• Connection of the Ventilator.............................................................................................................. 12
• Controlling the Temperature of Water Returning to the Boiler........................................................... 12
• Heating Output, Water Temperature and Water Flow Relationship.................................................... 12
• Installation of the Boiler Room.......................................................................................................... 13
• Requirements for the Chimney.......................................................................................................... 13
6. FUEL ...........................................................................................................14
7. OPERATION ..................................................................................................15
• Front Control Panel ........................................................................................................................... 15
• Rear Control Panel............................................................................................................................. 16
• Electronic Boiler Regulator KR-4.3D................................................................................................... 16
• Preparation for Firing........................................................................................................................ 17
• Kindling Procedure of the Boiler........................................................................................................ 18
• Fire Bed and Tips for Eective Boiler Stoking..................................................................................... 18
• Regulation of the Boiler Temperature................................................................................................ 19
• Addition of Fuel................................................................................................................................. 19
• Combustion Control .......................................................................................................................... 19
• Description of the Smoke Temperature Sensor Function.................................................................... 20
• Cleaning the Boiler............................................................................................................................ 20
• Emergency Shut Down of the Boiler .................................................................................................. 21
8. POSSIBLE FAULTS..........................................................................................21
9. WARRANTY AND ITS VALIDITY TERMS ..............................................................21
10. ACCEPTANCE CERTIFICATE.............................................................................22
SELLING CARD .................................................................................................22
BOILER INSTALLATION PROTOCOL.......................................................................23
WARRANTY AND POST-WARRANTY REPAIR CARD..................................................23
DECLARATION OF CONFORMITY..........................................................................24

3
INSTALLATION AND OPERATION MANUAL
This user manual was compiled following the requirements of EN 12171 “Heating systems in buildings. Procedure for the
preparation of documents for operation, maintenance and use. Heating systems not requiring a trained operator”.
1. SAFETY REQUIREMENTS
1.1. The room where the boiler is to be installed should be ventilated.
1.2. Free inow of air into the room should be ensured.
1.3. The boiler ue connection with the chimney should be tight. Do not heat up the boiler with leaking ue connections!
1.4. The boiler should be installed in a closed heating system with a closed (membranous) expansion vessel, the volume of
which should be no less than 10% of the total volume of the heating system (including the boiler) (the volume of the
expansion vessel can be calculated according to the standard EN 12828 annex D).
1.5. A safety valve for no more than 2 bar response pressure should be tted onto the boiler in the heating system for the
boilers Astra G-18E, Astra G-25E, Astra G-32E, and a maximal response pressure of 3 bar for the boiler Astra G-40E
(please see Chapter 5, “Requirements for connection of the boiler to the heating system”).
1.6. Remove the accumulated soot and resin from the boiler ues, as instructed in this manual.
1.7. The room where the boiler is installed should have re-extinguishing tools: re extinguishers, sand box, shovel and
other tools.
1.8. Do not place ammable materials on or near the boiler.
1.9. Connect the boiler to the electric system only via a three-pole plug plugged into an adequate three-pole socket with
earthing. Protect connection cable from damages.
1.10. Observe operation of temperature control devices and gauge readings when operating the boiler. In case of faulty
operation of the boiler, stop operation and remove the fault.
1.11. Kindle the boiler and put the rewood into the boiler only as indicated in Chapter 7 of this manual.
1.12. Keep children away from the boiler! The boiler can be serviced only by adults.
1.13. Before kindling the boiler, check if the heating system is lled with water and deaerated.
1.14. The operating pressure in the heating system should not exceed the following:
• 2 bar – for boilers Astra G-18E, Astra G-25E, Astra G-32E;
• 3 bar – for boiler Astra G- 40E.
1.15. The electrical connections are factory tested and the following parameters were conrmed:
• integrity of the protective circuit – electrical resistance of the protective circuit does not exceed 0.1Ω;
• resistance of the electrical insulation – at least 1.0 MΩ;
• resistance of electrical insulation was checked at 50 Hz, 1 000 V voltage.

4
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
2. TECHNICAL DESCRIPTION
• General View of the Boiler
Fig. 1 General view of the boiler
A – front view; B – rear view; C – top view; D - section.
1. Front control panel; 2. Rooftop cover; 3. Handle of the upper ue damper; 4. Door of the fuel chamber; 5. Adjustable support legs; 6. Flow water pipe; 7.
Rear control panel; 8. Sensor immersion pocket ½” of the safety temperature limiter 95°C valve; 9. Primary air regulation damper; 10. Ventilator; 11. Return
water pipe; 12. Water drain nipple; 13. Connections of the cooling serpentine; 14. Flue pipe; 15. Flue cleaning cap; 16. Smoke temperature sensor; 17. Safety
ventilator shutdown 95°C thermostat sensor; 18. Water temperature sensor; 19. Upper combustion chamber opening to the ue; 20. Primary air inlet
opening; 21. Secondary air inlet opening; 22. Ceramic burner; 23. Ceramic chopper; 24. Ceramic segment; 25. Opening to the ue
Astra G boiler model B L H h k D d N S
Astra G-18E 646 750 1156 130 130 152 G1 1/2” 205 215
Astra G-25E 646 965 1156 130 130 152 G1 1/2” 205 215
Astra G-32E 646 965 1246 1025 130 152 G1 1/2” 205 215
Astra G-40E 660 975 1176 935 210 152 G1 1/2” 160 160
L
24
5
3
19
20
23
14
15
25
24
17
k
d
H
h
9
12
6
13
B
11
8
10
22
21
17
AB
CD
D
d
S
N
10
16
16
18

5
INSTALLATION AND OPERATION MANUAL
• technical Data of the Boiler
Name of indicator Indicator value
Astra G-18E Astra G-25E Astra G-32E Astra G-40E
Nominal heat output rewood, kW 18 25 32 40
wooden briquettes, kW 20 28 33 42
Class of boiler according to EN 303-5 3 3 3 3
Class of protection against electric impact 1 1 1 1
Eciency rate,% 81-89 81-89 81-89 81-89
Power of emergency cooling system, kW 12 15 15 18
Water volume in the boiler, l 52 62 71 85
Setting range of the temperature regulator, °C 65-85 65-85 65-85 65-85
Maximum operating draught in the ue, mbar 0.25 0.30 0.30 0.30
Working pressure of water in the system, bar, max. 2.0 2.0 2.0 3.0
Testing pressure of the boiler, bar 3.0 3.0 3.0 4.5
Max. allowable water temperature in the boiler, °C 108 108 108 108
Max. allowable operating water temperature in the boiler, °C 95 95 95 95
Electric characteristics: voltage, V / frequency, Hz 220/50 220/50 220/50 220/50
average power used, W 40 50 58 80
Level of electric protection of the boiler IP30 IP30 IP30 IP30
Dimensions:
height, mm 1156 1156 1246 1176
width, mm 646 646 646 660
depth, mm 750 965 965 1176
Weight of boiler, kg, 260 310 330 380
Threaded connection diameter 1½” 1½” 1½” 1½”
Volume of fuel chamber, l 67 105 130 140
Dimensions of the loading aperture, mm 350x285 350x285 350x285 350x285
Flue gas duct diameter, mm 152 152 152 152
Length of wood pieces, mm 330 500 500 550
Average temperature of the ue gases at the nominal heat output, °C 165 188 195 205
Exhaust gases volume at the nominal heating capacity, m3/h 70 90 90 106-160
Resistance of the water tract, at temperature dierence of 10°C, mbar 6 9 8.5 13.8

6
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• turBulence Plates
Turbulence plates – a technology invented and patented by
“Astra” engineers, used for capturing more heat from the hot
exhaust smoke. It forces the exhaust smoke to hold, become
turbulent and thus transfer more heat to the adjacent heat
exchanger. The core of the device consists of the turbulence
plates, positioned at an angle in the rectangular-shaped ue
channel of the boiler. The inspection aperture 1 is installed on
the top part of the ue channel (Fig. 3), covered with a screw-
on cover with a gasket. This aperture is used for cleaning the
ue channel and placing/removing the turbulence plates.
The turbulence plates 2, shown in Fig. 3, maintain their
position in the ue due to their force of gravity alone. They
are inserted into the ue channel or removed using a poker
3, which is provided with the boiler. Poker 3 (Fig. 3) is bent
at an angle of approximately 80° to the handle, so that the
hooked plate does not slide o. In order to be able to hook
the turbulence plate 2 with a poker, a hole has been made in
its upper part for hooking with a poker. The plate rests upon
the heat exchanger 4 of the boiler ue on four supports: two
bottom and two upper supports. When inserting the plate 2
with a poker 3 into the ue channel, rst the lower position
is found, and after slightly loosening the poker, yet without
removing it from the hole, the plate is allowed to descent
onto the opposite side of the heat exchanger due to the force
of gravity until it touches the wall of the heat exchanger with
Ceramic
element
Boiler type
G-18E G-25E G-32E G-40E
1. Burner
G-18.00.003 1
K-30.00.007 1 1
ŠK-50.07.001 1
2. Chopper
G-18.00.002 1
ŠK-50.00.010 1 1 1
3. Segments
G-18.00.004 2 2 2
G-18.00.004-01 2
Fig. 3 Turbulence plate technology
1. Inspection aperture; 2. Turbulence plates; 3. Poker;
4. Heat exchanger of the boiler ue.
3
2
1
2
4
• ceramic elements of the Boiler
The boiler has ceramic elements of three types: ceramic burner 1, ceramic chopper 2 and two ceramic segments 3 (Fig. 2). The
chopper 2 must be moved to the back wall of the boiler chamber during operation of the boiler, segments 3 – resting upon the
front edge of the chopper. If needed, the ceramic burner 1 can be removed. For this purpose, use a screwdriver to remove the
sealing rope from between the ceramic burner and the frame of the boiler, then this ceramic insert can be removed.
Fig.2 Ceramic inserts and their positions
1. Ceramic burner; 2. Ceramic chopper; 3. Ceramic segments.
Ceramic
element
Boiler type
G-18E G-25E G-32E G-40E
1. Burner
G-18.00.003 1
K-30.00.007 1 1
ŠK-50.07.001 1
2. Chopper
G-32.01 111
G-32.02 1 1 2
3. Segments
G-18.00.004 222
G-18.00.004-01 2
2 a
2 b
3
1

7
INSTALLATION AND OPERATION MANUAL
its upper supports. Then the tool can be removed and the next plate can be installed in a similar way.
Turbulence plates decrease the temperature of the exhaust smoke. The boiler can be operated without the plates, but then
greater losses of heat through the chimney will occur.
3. INTENDED USE
The heating boiler is designed for the heating of residential and public buildings, manufacturing shops and other buildings
where a closed heating system has been installed. Control and regulation devices are installed in the boiler, which automatically
maintain the set water temperature, ensure economically ecient usage of the boiler and safe operation.
Boilers of this type are designed to burn wood, partially generating gases. Gas is extricated (generated) from the burning
rewood in the upper combustion chamber of the boiler and burned in the lower chamber. The intensity of gas generation
and combustion is regulated by the frequency and duration of air inow into the combustion chambers.
Advantages of the boiler are the following:
• gas generating combustion ensures eective burning of wood and a high eciency coecient since the burning process
takes place at a high temperature of 900°C;
• the heat output of the boiler can be regulated within the range of 40-100%. The boiler is automatically controlled using an electronic
regulator, by switching the ventilator inowing into the combustion chambers o or on, or by regulating the speed of its rotation;
• the combustion period of one fuel load is long due to the large volume of the fuel chamber;
• complete fuel combustion ensures cost-ecient fuel usage;
• the turbulence plates installed in the ue of the boiler enhance heat exchange in the boiler and reduce the temperature
of the smoke in the chimney;
• it is sucient to remove the ashes 1-2 times per week.
4. TRANSPORTATION, STORAGE, UNPACKING
The heating boiler is to be transported and packaged in accordance with the documentation of the manufacturer, protected
from precipitation and dust. It can be transported only in vertical position, fastened to avoid sliding and falling. If the boiler
is transported in other than vertical position, decorative surfaces may be damaged, cladding battered, control and regulation
equipment broken, built-in ceramic inserts may fall down and splinter. The heating boiler should be carefully loaded, unloaded
and transported, without any signicant impact.
The boiler should also be stored in a vertical position. It is not allowed to put one boiler on top of another, as a packaging
frame is not designed for this purpose. The boiler should be stored in a closed room protected from precipitation. The air
humidity of the room should not exceed 80%, in order to avoid condensate forming on the surfaces of the boiler. Storage
temperature may vary from -40°C to +60°C.
If the boiler was transported or stored in minus temperatures, then before it is kindled, it should be kept in plus temperature
for no less than 2 hours.
After the heating boiler is delivered to the site, take o the packing frame and polyethylene lm, unscrew boiler bolts and,
fastening to the packaging base, remove the boiler from the packaging base.
Open the doors of the boiler and check if all elements listed in a delivery kit are included.
The delivery kit consists of the following: boiler - 1 pc.; poker - 1 pc.; scraper - 1 pc.; ventilator - 1 pc.; operation manual - 1
pc.; support legs - 4 pcs.
Check if painted surfaces have not been damaged during transportation, if the components are not bent and if control and
regulation equipment is intact. In case you notice any inadequacies, present your claims to the vendor company.

8
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
5. INSTALLATION
• accumulation tank
These solid fuel boilers are intended to be fully loaded during the operation; the most ecient mode of their exploitation is at the
nominal or maximum heat output. It is advisable to install an accumulation tank of sucient size in their proximity, which could
accumulate the excessive heat. If the boiler is operated without the accumulation tank, its lifetime can be shortened because, in
such a case, a relatively low temperature of the outowing water is maintained in the boiler (65-70°C). Therefore, the temperature
of the water returning to the boiler from the heating system is as low as 55-60°C. More water vapour condenses in the boiler at such
operating temperatures, more tar accumulates on the internal walls of the boiler and metal corrosion intensies. When operating
the boiler with an accumulation tank, it is possible and advisable to maintain constantly maximum temperature of outowing and
returning water, respectively 85°C and 72°C, then condensation of water vapour and metal corrosion will be signicantly lower.
Recommended capacity of the accumulation tank is approximately 50 litres per 1 kW of nominal power of boiler:
Boiler model Astra G-18E Astra G-25E Astra G-32E Astra G-40E
Required volume of the accumulation tank, litres 900 1200 1500 2000
The boiler is to be operated only with an emergency cooling system installed!
• DescriPtion of the emerGency coolinG system DiaGram
A thermostatic safety temperature limiter 95°C valve (Fig. 4)
protects the boiler form the overheating. If the water temperature
in the boiler exceeds 95°C, the valve automatically opens the ow
of cold water from the public water supply network through the
cooling serpentine, where it absorbs the excessive heat energy and
ows out into the sewage. The sensor of the valve with the external
thread ½” is screwed onto the socket on the rear wall of the boiler.
Technical data of the thermostatic safety valve are the
following: Opening temperature - 95°C; Maximum operating
temperature- 110°C; Operating pressure - 10 bar; Bulb of the
sensor - L=142 mm, external thread ½“.
The emergency cooling system protecting the
boiler from overheating cannot be used for heating
domestic water.
• DescriPtion of the house heatinG system
SCHEME
The house heating system with an accumulation tank could be
divided functionally into two circles: heat production and heat
consumption. Both circles operate independently and interact in the accumulation tank. The heat production circle consists
of a boiler, Laddomat 21 thermostatic mixing unit with a circulation pump installed in it, expansion vessel, ttings and
accumulation tank. The intended use of this circle is to charge the accumulation tank only. To charge the tank, the boiler could
operate on its maximum heat output and outowing water temperature 85°C. That mode of boiler operation is optimal for
the boiler and combustion process itself.
1
2 3
5
4
4 pav. Avarinio aušinimo sistemos pajungimo schema
1. Į kanalizaciją;
2. Terminis apsauginis vožtuvas;
3. Filtras;
4. Vanduo iš vandentiekio.
Slėgis 2-6 bar.Temperatūra °C;
5. Terminio apsauginio vožtuvo sensorius.
Fig. 4 Connection diagram of the emergency cooling system
1. To sewage; 2. Thermostatic safety temperature limiter 95°C
valve; 3. Filter; 4. Water from public water supply, pressure 2-6 bar,
temperature 12°C; 5. Sensor of the thermostatic safety temperature
limiter 95°C valve.

9
INSTALLATION AND OPERATION MANUAL
TM
TM
T
T
T
MTM
T
TM
T
Fig. 5 Principle scheme of the house heating system including heat accumulation
Laddomat 21 Thermostatic Mixing Valve
Pump Control
Flow Control Valve
Heating Boiler
Flow Control Valve
Air Outlet Water Heating
Domestic Water Recirculation
Pump Control Thermostatic Switch
Membrane Expansion Vessel
Thermostatic Mixing Valve
Domestic Water Preparation
From Water Supply
Hot Water
Air Outlet
Other Notations:
Automatic Water Addition Valve
Accumulation Tank
Thermometer
3-Way Servo Drive Mixing Valve
Return Overow Valve
Filter
Heating System Supply
Heating System Return
Automatic Air Outlet
Return ValveValvePressure Relief
Valve Pump
Thermometer - Manometer Manometer
With Valve
Water Supply
Programmable Heating System Processor
Min 65oC!
Heat production Heat consumption

10
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
The heat consumption circle uses the heat accumulated in the tank. The circle consists of a room thermostat or a programmed
control processor, room or/and outside temperature sensors, 3-way servo drive, mixing valve, underoor heating system,
radiators, piping, ttings. The programmed processor controls a 3-way mixing valve, which allows more or less heat (45-60°
C) into the radiators, according to demand. This way of heat consumption allows the heating of the house as long as the tank
stores heat independently from the boiler.
• requirements for connection of the Boiler to the heatinG system
The following requirements should be fullled when installing the boiler:
• The boiler should be installed in a closed heating system with a closed membranous expansion vessel, the volume of which should
be no less than 10% of the total volume of the system. A closed heating system is a kind of system with no free access to atmospheric
air, which actuates corrosion. Due to this, drainage of water from the system without an important reason is undesirable, e. g. in
summer. It is also necessary to ensure watertightness of the system in order to need fewer rells with fresh water containing free
oxygen. The quantity of the additional water let in should not exceed 5% of the system water volume per year;
• The boiler is connected to the heating system through connection pipes 6 – water supplied to the heating system and
11 – water returning from the heating system (Fig. 1);
• Internal threads G 1½” of pipes 6 and 11 ;
• There is a nipple 12 for water lling or draining from the boiler (Fig. 1);
• Internal thread G ½” of the nipple 12;
• A pressure relief valve conforming to norm EN1268-1 is to be installed in the heating system as close to the boiler as
possible at a location easy to reach by hand;
• pressure relief valves and control devices must conform to the following technical characteristics:
Instrument Technical characteristics Type of boiler
Pressure relief valve Connection diam. does not exceed ½”, set opening pressure 2 bar Astra G-18E, Astra G-25E , Astra G-32E
Pressure relief valve Connection diam. does not exceed ¾”, set opening pressure 3 bar Astra G-40E
Thermometer-manometer Range of temperature 0-120°C, pressure 0 – 4.0 bar All boilers
There must be no ball valves installed between the boiler and the pressure relief valve.
• Water from the pressure relief valve should be conducted via an otake pipe. It should be conducted in a way that will
allow the water passing through the pressure relief valve to ow safely, avoiding exposure of people and electrical parts of
the boiler. The diameter of the otake pipe should be no less than the diameter of the otake opening connection nipple of
the safety valve. The total length of the otake pipe should not exceed 2 m. No more than 2 elbow joints at angles of 90° are
to be used when installing this duct. No ball, mixing or other valves are to be installed in the water otake pipe. This otake
pipe is to be installed in a way that will make the ow of the passing water visible. If part of the pipe installed is hidden, e. g.,
in a sewerage pipe, then such a pipe should have a special funnel enabling visual observation of the otake ow of water.
Operation of the pressure relief valve is to be checked at least once a month. The valve is opened
for a short period of time, by turning its head, to reveal a small amount of the otake water. If this is not
done periodically, the parts of the valve can stick together due to high temperature and fail to open, when
required. In case the safety valve fails to open in an emergency situation, serious damage to the boiler and
the heating system can occur as well as hazard to the health and life of people.

11
INSTALLATION AND OPERATION MANUAL
• An electric installation with earthing, in accordance with the electric safety regulations in force, is to be installed when
connecting the electric part of the boiler.
Protect the isolation of the mains cable against damage.
Fig. 6 Circuit diagram of the boiler
S1 - power supply switch; S2 – ventilator switch; SK – emergency ventilator shutdown 95°C thermostat; F - fuse; M - ventilator;
- circulation pump of the heating system; KR – electronic controller; U1,2 - water temperature sensors; U3 - smoke temperature sensor.
In order to guarantee natural water circulation of water in the boiler, the pipework between the boiler
and the mixing valve in the line boiler–mixing valve–boiler is to be of the same diameter and correspond to
the diameter of the connection pipes of the boiler.
• circuit DiaGram of the Boiler
1 2 3 4 5 6 7 8 9 10 11 12
N L L1 L13 L14 N L3 N L4
M
PNLPN
220V
PNL
X1
L1 N L2 L3 L4 P
X2 KR
L13
L2
N
L13
L14
NL
S1S2SK
L
L
L1
UU
F
X3
U
1 2 3

12
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• connection of the
CIRCULATION PUMP
In order to insure a continuous ow of
water, a circulation pump is to be installed
in the system, on the return water pipe
behind the mixing valve. The electronic
controller of the boiler controls the
pump. Before connecting the circulation
pump, remove the rooftop cover of the
boiler (Fig. 7). The cover is removed in
the following sequence: 1) unscrew two
fastening bolts, 2) lift the backside part
of the cover, 3) push the cover forward
and then lift it up. Connect the wire of
the circulation pump to the 12-way
electric terminal connector, contacts No
11 and 12, marked with the sign (See
Fig. 6 “Circuit diagram of the boiler”). Connect the earthing wire of the pump to the contact No. 1 on the same connector.
• connection of the Ventilator
The boiler is transported with the ventilator removed and put into the upper chamber of the boiler (Astra G-18E, Astra
G-25E, Astra G-32E) or fastened using adhesive tape to the top of the packaging frame of the boiler (Astra G-40E).
For boilers Astra G-18E, Astra G-25E, Astra G-32E: unpack the ventilator and release the clamp on the nipple at the ventilator
installation bed 10 (Fig. 1). Put the opening of the ventilator onto the nipple, slip a clamp on top and tighten it. Check if a ventilator
case sits tightly. Connect the wires of the ventilator cable lead through a hole in the rooftop cover of the boiler to the terminals of
the ventilator. For boilers Astra G-40E: unpack the ventilator, screw its case on at the ventilator installation bed 10 (Fig. 1) using
the existing bolts and check the stiness of the connection. The ventilator cable has already been connected during fabrication.
• controllinG the temPerature of water returninG to the Boiler
It is absolutely necessary to maintain the temperature of the water returning from the heating system to the boiler at a
constant level, no less than 65°C, as this will prolong the lifetime of the boiler and will make the combustion process more
eective. This is because when a constant high temperature of water returning to the boiler is maintained, there arises
signicantly less water vapour condensation inside the boiler. The heavy water condensation is harmful to the boiler, because
deposits of tar, pitch and soot accumulate on the walls of the heat exchanger, causing intense metal corrosion. Moreover, the
resulting layer of soot impedes eective heat transfer and the eciency of the boiler falls.
In order to maintain the temperature, we recommend installing the small circulation circle together with a Swedish-made
thermoregulation device, “Laddomat 21-60”. Make sure that the “Laddomat” is supplied with the 78°C or 72°C thermostat
cartridge. The mentioned temperature is the one at which the valve of the device opens completely. However, the actual
temperature of the water returning from the system and getting into the boiler after mixing, is 5-6°C lower. The higher the
temperature of the return water is, the better it is for the boiler. Thermoregulation devices of other manufacturers could be
used for maintaining the temperature of the returning water as well.
• heatinG outPut, water temPerature anD water flow relationshiP
The heating output supplied to a heating system depends directly upon the dierence of ow and return water temperatures
Fig. 7 Removing the rooftop cover of the boiler
1. Unscrew bolts; 2. Lift the backside of the cover; 3. Push the cover forward , then raise.
3
1
1
2

13
INSTALLATION AND OPERATION MANUAL
Δt and the intensity of the water ow circulating
through the boiler. The boiler will fail to reach
the desired temperature of the ow water if
the returning water temperature is too cold
or the circulation pump is too powerful. This
will happen because the boiler will be forced
to produce a larger heating output than it has
been designed for. The most eective boiler
operation occurs when the dierence between
the ow and return water temperatures is 12-
14°C. If the boiler is forced to operate with a 20°C or even greater temperature dierence, it will work ineectively, consume
too much of fuel, and the combustion period of one fuel load will consequently shorten. If the previously mentioned dierence
of temperatures is kept less than 10°C, the fuel in the boiler will again burn ineciently and fume because of a lack of air
supply. If you know the water ow intensity near your boiler, in the above presented table you can check, what the dierence
of ow and return temperatures your boiler is capable to maintain, when operating at the nominal heating output.
Do not forget to keep the returning water temperature as high as possible, at least 65°C or even higher!
It is necessary to assure that a thermometer is installed on the returning water pipe, in order to be able to
observe this temperature at any time!
• installation of the Boiler room
The boiler room should be ventilated. The required air inow necessary for combustion should be also ensured. For this
purpose, boiler room doors should have ventilation grating or there should be a sucient gap between the doors and the
oor. If there is no possibility to supply air in from another rooms or the house is very tight, it will be necessary to install an
opening in the exterior wall. The cross-section area of the opening should be at least 0.001 m2/kW.
Place the boiler as close to the ue as possible on a hard concrete levelled basement. Leave at least 600 mm gap between the
backside casing of the boiler and the room wall for boiler servicing and cleaning. The smallest distance between a lateral casing
of the boiler and a building structure is 400 mm. If the building structure is made of ammable materials, this distance should be
doubled. A freely approachable space of at least 800 mm should be then left from the opposite side of the boiler to ensure access
to the backside of the boiler, for its servicing and cleaning. The oor under the boiler, within the distance of 50 cm in front of it and
within the distance of 30 cm around the boiler should be made of inammable materials. Screw supporting legs onto the base of
the boiler and level the boiler with screw nuts using a level; then connect the heating system circulation pump to the boiler.
The smoke exhaust pipe of the boiler should be connected to the chimney through a metal duct. The internal diameter of
the metal connecting duct should be at least the same as the external diameter of the smoke exhaust pipe of the boiler. To
improve the draught, the connecting duct between the boiler and the chimney should be installed at an inclination towards
the boiler. All junctions should be carefully tightened using a heat-resistant material and insulated using thermal insulation.
If an additional damper is installed between the boiler and the chimney for the draught control purpose,
the damper should not close more than 2/3 of the cross-section area of the opening in its fully closed position.
• requirements for the chimney
It is recommended to insert acid-resistant stainless steel liner, if the chimney is made from masonry. It improves draught of
the chimney and protects the masonry from destruction due to the impact of condensate. Internal diameter of the liner should
Dierence
of water
temperatures
t, °C
Heating output, kW
18 25 32 40
Water ow, l/min
11 24 33 43 53
12 22 31 39 49
13 20 28 36 45
14 19 26 33 42
15 18 24 31 39
16 16 23 29 37
17 16 22 28 34
18 15 20 26 33

14
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
The connection of other devices to the chimney to which the boiler is connected is prohibited.
The chimney should be cleaned at least once a year!
6. FUEL
The boiler is red only by wood logs and wood briquettes. It is possible to re it with fuel peat briquettes, however the operation
of the boiler becomes less comfortable for the user as it is necessary to remove the ashes of these highly ash-producing briquettes
after each loading. The ceramic elements of the lower chamber can be damaged if they are removed every day when cleaning,
thus their lifetime will be shorter. Therefore, we recommend usage of fuel peat briquettes only in rare, exceptional cases.
It is recommended to re dry rewood with a moisture content of 12-20 %. The drier the rewood, the larger its caloric capacity.
When the moisture content of the rewood is 20%, the heat potential of 1 kg is approximately 4 kWh; when the moisture
content is 50%, its heat potential is reduced by half.
8 pav. Kamino padơtis greta esanþiǐ objektǐ atžvilgiu
Fig. 8 Positioning of a chimney in respect to vicinity objects
be no less than the external diameter of the smoke exhaust pipe of the boiler. The chimney liner can be round or oval. It is not
recommended to use rectangular-shaped liner as, due to the temperature uctuations, its walls deform, gaps appear at the
element junction points, through which the condensate falls on the walls of the bricks chimney. Additional air is sucked in, which
reduces draught of the chimney. Draught for each boiler model should correspond to the referred value of draught in the table
“Technical data”. The liner should be factory made. Minimum permissible height of the chimney should be at least 6m. The top
of the chimney should be above the ridge at least by 0.5m. If the chimney is further from the ridge than 1m, the angle horizon-
the ridge- the cap of the chimney should consist 10° or less degrees. Draught of the chimney can also be negatively aected by
various obstructions near the building: trees, hills, other buildings. Fig. 8 presents the recommended minimal angles between the
chimney, nearby objects and the horizon. Angles larger than those indicated will cause reduction of draught of the chimney.

15
INSTALLATION AND OPERATION MANUAL
The length of the rewood should be at least 5cm shorter than the length of the boiler combustion chamber.
Type of boiler Astra G-18E Astra G-25E Astra G-32E Astra G-40E
Length of rewood, mm 310 500 500 550
The recommended thickness of the wood logs is 100-150mm. Thicker pieces of rewood should be split at least once. Up to
15% of the fuel load can consist of ne wooden splinters and sawdust. However, they must be loaded in such a way so as not
to block the opening of the ceramic burner 22 (Fig. 1) connecting the upper and lower chambers of the boiler.
Do not re freshly prepared and excessively damp pieces of rewood. The operation of the boiler
becomes inecient, deposits of resin emerge on its inside walls as well as excessive condensate. Corrosion of
the boiler takes place several times faster when ring it with freshly prepared wood or wood that has been
dried outside for several months only!
Recommendations for rewood preparation:
• put split wood in a properly-ventilated place – if possible, in a sunlit place;
• rewood should be well sheltered from rain and snow;
• pieces of split wood should be stacked with sucient gaps between them so that the freely-circulating air can blow away
the moisture evaporated from the pieces of rewood;
• there should be sucient space above the heap of rewood below the roof and sucient ventilation to remove the moist air;
• it is not advisable to store freshly-cut rewood in a basement since the rewood needs sun and free air movement to dry.
Dry wood can be stored in the basement where sucient ventilation is guaranteed;
• it is recommended to dry the split rewood outdoors under the above-mentioned conditions. Depending on the type of wood,
soft wood (alder, asp, r, poplar) must be dried for at least 8 months, and hard wood (oak, ash, birch) for at least 20 months.
Firing the boiler with coal, rubber or plastics is prohibited. However, loading wood briquettes into the
boiler together with their plastic packaging bags is allowed.
7. OPERATION
• front control Panel
The front control panel has an electronic boiler regulator 1, a green button for switching voltage to the boiler on/o 2 and
a red button for switching on the ventilator 3. These buttons light up in the activated state. For more details on the operation
of the front panel buttons, see “Electronic boiler regulator KR-4.3D” and “Boiler kindling procedure”.
Fig. 9 Front control panel
1. Electronic boiler regulator; 2. Green button for switching the voltage of the boiler on and o; 3. Red button for switching on the ventilator.
1 2 3

16
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• rear control Panel
The following safety devices are installed in the rear control panel: thermal fuse
1 and electric fuse 2 (Fig. 10). The purpose of the thermal fuse, otherwise called the
maximum boiler temperature emergency thermostat, is to switch o the boiler
ventilator if water temperature in the boiler exceeds the maximum permissible 95°C
due to unforeseen reasons. The temperature sensor of the thermostat is installed in
a dedicated sleeve 16 (Fig. 1). The burning intensity decreases when the ventilator is
switched o and the water temperature decreases. When the emergency thermostat
trips, the lamp of the ventilator switch 3 on the front panel switches o (Fig. 9) and
the lighting indicator bulb 4 “Firing o” on the electronic regulator lights up (Fig.
11). In this case, it is necessary to nd out the causes of tripping and to remove them. After the boiler cools down, the emergency
thermostat can be returned to its normal operating mode. For this purpose, unscrew its cover and depress the red button.
The cause of overheating of the boiler and tripping of the emergency thermostat must be found and
removed. If this is not done, the risk of serious damage to boiler equipment as well as hazard to human health
and life remains. If the user cannot locate and remove the cause of tripping of the emergency thermostat, a
professional servicing company must be consulted!
The electric fuse is designated to protect the elements of the electric circuit in case the current in the mains exceeds 2 A. If the
fuse is damaged, the boiler will not switch on and its indicator lamps will not light. In this case, remove and replace the fuse.
The rear control panel of the boiler is grounded.
• electronic Boiler reGulator kr-4.3D
The electronic boiler regulator KR-4.3D is designed
for controlling a solid fuel boiler. It controls the
ventilator in accordance with the PID regulation law
and the circulation pump of the system, by position
“on-o”. The regulator adjusts the rotation speed
of the ventilator using the impulse method, thus
intensifying or slowing down the burning process.
The speed of the ventilator is dened in proportion
to the actual temperature deviation from the set
temperature, the duration of the deviation and
the speed of temperature change of the boiler. The
regulator reacts to the water temperature in the
boiler and smoke temperature in the ue. A NTC-type sensor for measuring water temperature is installed in the special
immersion pocket 18 (Fig. 1), the outer side of which is submerged in water inside the boiler. A PT-type sensor for measuring
smoke temperature is installed in the special sleeve 16 (Fig. 1), which is located in the ue gases duct of the boiler.
The digital temperature indicator 1 (Fig. 11) indicates both the measured and the set temperature of water in the boiler. The
setpoint temperature is adjusted using the buttons 2. After a short press of “+” or “-” the digital indicator 1 starts showing the setpoint
temperature of the boiler water. In order to change it, the appropriate button must be pressed: “+” for increasing and “-” for decreasing
the temperature. After several seconds after the last press of a button, the setpoint temperature is saved and the indicator returns to
showing the measured temperature of the boiler water.
When it indicates the setpoint temperature, a dot lights up beside the readout. When the indicator indicates the real measured
Fig. 11 Front panel of regulator KR-4.3D
1 - digital temperature indicator; 2 - temperature setting buttons; 3 - lamp “Firing
on”, 4 - lamp “Firing o”, 5 - lamp “Pump on”, 6 - lamp “Ventilator on”, 7 - lamp
“Programmable channel on”, 8 - multifunction button.
1 2
7
3 4 5 6 8
1 2
Fig. 10 Rear control panel
1. Thermal fuse ; 2. Electric fuse.

17
INSTALLATION AND OPERATION MANUAL
temperature, the dot does not appear. The regulator allows
adjustment of the temperature within the range of 65-85°C.
Lamp 3 “Firing on” indicates the active status of the boiler.
This lamp lights up when the ventilator is switched on using the
button 3 (Fig. 9) on the front control panel and regulation of the
ventilator speed starts. The ventilator can be in operation mode
only when the signal lamp 3 (Fig. 11) lights.
Lamp 4 lights up when the boiler turns to the mode
“Firing o”. This boiler operation mode is established if
the following condition occurs:
• if during operation the temperature of ue gases drops
bellow 75°C and does not rise for some time.
Lamp 5 “Pump on” lights up when the regulator switches
on the circulation pump of the system. In accordance with the
manufacturer’s settings, this occurs when the boiler water
temperature exceeds 60°C. The pump is switched o, when
the ring in the boiler nears the end and the temperature of
the ue gases drops below 75° C. Then, pump indicator lamp 5 switches o as well. Service programming mode can be used to adjust
other limit temperatures for switching the circulation pump on (in the range of 55-73°C) and o (in whatever temperature range). To
carry out such adjustment, a servicing company should be contacted.
Lamp 6 “Ventilator on” lights up when the boiler ventilator is operating. The more frequently it blinks, the higher the
rotational speed of the ventilator is, since its blinking frequency corresponds to the impulse frequency of the power supply to
the ventilator. If this lamp is lighting constantly, it means that the ventilator is operating at 100% of its capacity.
Lamp 7 signals that the programming output channel is switched on. Button 8 is used for service programming and can
only be used by the specialists of the service company. We do not recommend the user to modify the programming modes.
Button 8 is multipurpose, and is used for some support functions and service programming.
The boiler regulator is connected to the boiler circuit in accordance with the scheme shown in Fig. 12. The power supply L2, stemming
from the front control panel and transferred to the regulator, is switched on when switches 2 and 3 (Fig. 9) are in the position ON and the
emergency thermostat has not tripped. The impulse commutator regulating the ventilator connects periodically L2 to L3. When the boiler
switches to status “Firing o”, L3 does not supply power to the ventilator and lamp 4 (Fig. 11) lights up. To return to the mode “Firing on”,
the power supply L2 should be interrupted by switching o the ventilator switch 3 (Fig. 9) or the power supply of the boiler (on/o button
2, Fig. 9), and later turning them on. The pump control relay connects L4 to L1. The programmable channel relay connects P to L1.
The power of the operating ventilator ranges between 20÷100 VA. The maximum allowed power of the circulation pump
connected to the regulator is 250 VA. The maximum allowed power of the programmable channel is 250 VA.
• PreParation for firinG
Before kindling the boiler, check the position of the ceramic chopper 2 in the lower combustion chamber: the edge of the
chopper must be in contact with the rear wall of the boiler (Fig. 2). Place two ceramic segments 3 (Fig. 2) on the chopper so
that they contact the walls of the boiler chamber.
Fill the heating system with water. The lling pressure should be 0.2 bar bigger than the hydrostatic pressure, yet it must
not exceed the operating pressure of the boiler. After lling the system with water, perform a visual check of the tightness of
the entire system. Perform it before kindling the boiler, then again after kindling and reaching the nominal operating mode.
Check if the heating system is properly deaerated.
KR-4.3D
X-2 X-3 X-1
U
L1 NL2 L3 L4 P
L1, N- reguliatoriaus maitinimas;
L2 - ventiliatoriaus maitinimas;
L3 - įtampa į ventiliatorių;
L4 - įtampa į siurblį;
P - įtampa į programuojamą išėjimą;
U - vandens temperatūros jutiklis;
U - dūmų temperatūros jutiklis.
U
1
2
12
Rear panel of the regulator
Fig. 12 Regulator connection diagram
L1, N – power supply to the regulator; L2- power supply from front control
panel to the ventilator; L3 – voltage to the ventilator; L4 – voltage to
the pump; P – voltage to the programmable channel; U – boiler water
temperature sensor.

18
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• kinDlinG ProceDure of the Boiler
Before kindling the boiler, check whether all requirements indicated in the section 1 are executed.
Open the damper of the upper ue 19 by pulling the handle 3 (Fig. 1) towards yourself. Open the door of the upper
combustion chamber, put dry smaller kindling wood pieces and paper on the ceramic bottom so that the paper protrudes into
the lower combustion chamber through the rectangular opening of the ceramic burner 1 (Fig. 2) – this way, it will be easy
to kindle the boiler through the lower combustion chamber. Put some of the easily ammable materials and larger pieces of
kindling wood and rewood atop. Load the wood without any large gaps at the top of combustion chamber. Bigger pieces of
rewood should be loaded in the middle and smaller prices at the sides, because the walls of the combustion chamber slow
down the combustion of the bigger pieces of wood, due to their lower temperature.
Donotcovertheentireopeningof the upper ue 19 (Fig. 1)with the wood,becauseitwill make kindling
more dicult.
The rst time, kindle the boiler using only paper and small pieces of wood in order to safely remove the
moisture remaining in the ceramic elements.
Switch on the voltage, using button 2 on the front control panel. The boiler water temperature indicator will light up on the
electronic regulator (Fig. 9). Set the required outowing boiler water temperature using the temperature setting buttons; we
recommend a temperature of at least 75°C or – even better – a higher temperature. Close the door of the upper combustion
chamber, open the lower door and set the kindling material on re. Observe the rising water temperature in the regulator display.
Keep the lower door open until the boiler water will heat up to 40°C. Then close the lower door, close the damper 19 of the upper
ue by pushing its handle 3 (Fig. 1). Then switch on the ventilator switch 3 on the control panel (Fig. 9). After that, the boiler will
operate in automatic mode: it will try to reach and maintain the setpoint temperature of the water outowing from the boiler.
When ring the boiler for the rst time, the condensation of the residual moisture and drainage of water in the lower
combustion chamber occurs. This is not a shortcoming. After kindling the boiler several times, this phenomenon disappears.
The doors of the boiler combustion chambers should be tightly closed, there should be no ue gases
seeping into the ambience through them. Door tightness is regulated by screwing or unscrewing the hinge
and lock screws of the door.
• fire BeD anD tiPs for effectiVe Boiler stokinG
The hot embers and charcoal in the boiler are called the re bed. Combustible gases emerge from there and are further
burned in the lower chamber of the boiler. The optimal re bed height during boiler operation is approximately 4-5 cm above
the bottom of the fuel chamber. The output of the boiler ventilator is deliberately chosen with the purpose of suciently
supplying the re bed with air. Then, the most eective combustion of wood gases takes place. Avoid a situation when the
volume of the re bed expands several times. This situation can occur if very dry and thinly cut wood gets loaded into the
fuel chamber. Consequently, the volume of the re bed increases rapidly during the burning process and soon a lack of air
occurs, allowing the combustible gases to escape unburned through the chimney into the atmosphere. An indicator of this
undesirable course is dense fumes emerging from the chimney.
The best way to stoke a boiler is the so-called two stages method. During the rst stage, the boiler is stoked with a small
amount of fuel. The aim of this phase is to warm up the boiler and form the optimal re bed. The second stage is intended for
full fuel loading and to perform the main combustion.
The rst stage: Prepare thin-cut wood and paper for an easy start. The volume of loaded fuel should be about 15-20 % of the

19
INSTALLATION AND OPERATION MANUAL
fuel chamber’s capacity. Open the upper ue damper 3 (Fig.1) and both boiler doors, put the wood and paper inside. Kindle
the paper, make sure that the ring starts and close the upper door. After the temperature of water in the boiler reaches 45°
C, close the damper and the lower door and turn on the ventilator. Let the boiler burn further for 30 minutes.
The second stage: Load the boiler fully. If wood briquettes are used for stoking, load approx. 70 % of the fuel chamber’s capacity.
Before opening the door, simultaneously press the “+” and “-”controller knobs, shown in Fig. 11. The letter “L” will appear on the
display and the ventilator will stop. Open the damper 3 (Fig. 1) by pulling the handle towards yourself, and after some time, open
the upper boiler door very slowly to avoid smoke escaping into the room. Load the fuel, close the door and push the handle of the
damper 3 (Fig. 1). Press the knob “P” on the controller panel. The ventilator will start and the boiler will continue its ring mode.
If you lack time to stoke the boiler in the two stages mode as described above, then stoke it by one stage. The boiler will operate
as usual. But if there is the possibility to do so, use the two stages mode in order to achieve an even more eective combustion.
• reGulation of the Boiler temPerature
See the technical description of the electronic regulator KR-4.3D.
• aDDition of fuel
It is important to stop the ongoing program of a controller when adding fuel into an operating boiler
(see the recommendations below)!
When the boiler is still active, the controller lamp 3 “Firing on” (Fig. 11) light is on. To add more rewood, perform the
following procedure:
1. Press the controller knobs "+" and "-" simultaneously. The symbol "L" will appear on the display, indicating the program
has been paused. The ventilator will automatically stop.
2. After the rewood has been added, resume the controller program operation by pressing "P" knob. The symbol "L"
must disappear from the display. The ventilator will automatically turn on and continue its operation from the point of
interruption.
While adding rewood into the combustion chamber after a fuel load has burned o, perform a usual procedure:
1. Open the damper of the upper ue 19 by pulling the handle 3 towards yourself (Fig. 1).
2. Switch o the ventilator switch 3 (Fig. 9).
3. Wait at least 20 seconds, allowing the smoke to be removed by draught; then slowly open the upper door.
4. Put the rewood in and close the door tightly.
5. Switch on the ventilator.
6. Close the damper of the upper ue.
If operated following this order, smoke and carbon monoxide will not enter the room. Water temperature and pressure in
the system are checked by readings of the thermometer-manometer, installed in the heating system.
• comBustion control
The status of the boiler ring process can be perceived from the regulator lamps “Firing on” or “Firing o” (see description of
the regulators KR-4.3, Fig. 11). The ame in the boiler can be checked by opening the door of the lower combustion chamber
when the ventilator is on. The visible tongue of ame has to be yellow or yellow-red and reach the ceramic element; this
means the ring is proceeding in an optimal manner.
Donotkeepthelowerdooroftheboileropenforextendedperiodsoftimeduringring:thelowerchamber
contains gases which, when escaping into the boiler room in larger amounts, can impair human health.

20
HEATING BOILERS: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
• DescriPtion of the smoke temPerature sensor function
The smoke temperature sensor is mounted in Astra boilers in order to: 1) help the controller achieve the optimal smoke temperature,
2) turn o the ventilator after ring in the boiler is accomplished, 3) turn o the circulation pump after the ring in the boiler is over.
Although the optimal smoke temperature is set up in the factory, we recommend that you set the temperature by yourself once
again after the installation of the boiler at its operation place. In this way, a more precise temperature will be set up with respect to
the fuel used, draught and other peculiarities of the installation. For that purpose, the boiler must be brought up to an optimal and
stable operation mode, and the smoke temperature at this time must be determined and xed. First, set the water temperature on
the boiler controller; we recommend 85° C, or at least 75° C. This temperature should be the one you will use to set in the future boiler
operation. Kindle the boiler using the two stages method described in the chapter “Fire bed and tips for eective boiler stoking”.
Verify the state of combustion by opening the lower door after 45-60 minutes from the beginning of ring. At that moment, the
ame tongue must be reaching the lower ceramic element, and the colour of the tongue must be yellow-red. Then check the actual
smoke temperature by pressing the controller knobs “P” and “+” simultaneously. As a result, the screen should display a two-digit
number representing the actual smoke temperature. The number must be multiplied by 10 to determine the actual temperature. For
example, if the number 16 is displayed, that means that the actual measured smoke temperature is 160° C. The number will stay lit for
3 seconds. During this period, the controller knob “P” must be pressed again. The number on the display will blink and will then stay
lit permanently for a short moment; after 3 next seconds, the controller will automatically leave the programming mode and return
to its usual operation mode. Now the new optimal smoke temperature has been set up.
In a usual boiler operation, after the ring has been completed, the smoke temperature sensor will help to turn o the
ventilator of the boiler and the circulation pump. When the temperature of the ue gases drops bellow 75° C, the rotational
speed of the ventilator is minimized and after some more time, the ventilator and circulation pump are turned o.
If you think that that the smoke temperature sensor is unnecessary for your boiler, you can easily shut it o. For that purpose,
take o the rooftop panel of the boiler (Fig.7) and unplug the sensor from the controller’s X3 socket. The boiler controller will
automatically switch to operate by another programme controlling the boiler without the smoke temperature sensor.
• cleaninG the Boiler
Ashes are removed from the boiler every 4-7 days. Open the door of the upper combustion chamber and shovel ashes down to the
lower chamber. Open the door of the lower chamber, take out only ceramic segments 3 (Fig. 2), pour ashes to a metal box. It is not
necessary to take out the triangle ceramic chopper 2 (Fig. 2) at the time of cleaning, ashes underneath it may be raked using scraper.
In any case, strictly follow the established procedure when opening the upper door: open the damper
of the upper ue, then after 20 seconds, open the boiler door.
Clean boiler chambers from tar, pitch and scurf once or twice a month. Clean the boiler when the fuel has been completely
burned and the boiler is cooled down to at least +40°C.
Open the upper cap 15 for cleaning the ue (Fig. 1). Remove the turbulence plates from the ue by hooking them and
pulling them out with the poker, then clean them using a scraper. Clean tar and scurf from combustion chambers and ue
walls using a scraper and metal hog. Clean with the doors of the combustion chambers open. The soot residues falling down
from the ue walls during the cleaning process are raked out of the boiler through the lower opening of the combustion
chamber 25 (Fig. 1), pulling them outwards. When nished, place the turbulence plates back and close the cleaning cap.
Control water pressure in the heating system at least once every two weeks. If the pressure drops,
raise it by lling up the system with more water. If the boiler is not being heated for a longer time, drain the
water out of the system when air temperature is below 0°C!