Stropuva S7 Manual

DOMESTIC SOLID FUEL BOILER
STROPUVA
INSTALLATION AND
MAINTENANCE MANUAL
CERTIFICATE NO. SPSC-672

2
CONTENT
1. THE MAIN TECHNICAL DATA............................................................................................. 3
2. BOILER DIAGRAM ................................................................................................................. 4
3. DESCRIPTION OF A STRUCTURE ....................................................................................... 5
4. TRANSPORTATION AND WAREHOUSING........................................................................ 5
5. BOILER FITTING ..................................................................................................................... 5
5.1. FIRE REQUIREMENTS.................................................................................................... 6
5.2. REQUIREMENTS FOR THE CHIMNEY FLUE ............................................................. 6
5.3. REQUIREMENTS FOR CONNECTING TO THE HEATING SYSTEM ....................... 7
6. MOUNTING PICTURE OF SOLID FUEL BOILER STROPUVA S40 NODE WITH THE
LOST OF PARTS ............................................................................................................................. 8
6.1. HEATING SYSTEM SCHEME......................................................................................... 9
6.2. DESCRIPTION OF HEATING SYSTEM SCHEME OPERATION .............................. 10
7. MOUNTING PICTURE OF SOLID FUEL BOILER STROPUVA S40 NODE WITH THE
LOST OF PARTS ........................................................................................................................... 11
7.1. HEATING SYSTEM SCHEME WITHOUT ADDITIONAL BOILER AND FLOOR
HEATING ....................................................................................................................................... 12
7.2. DESCRIPTION OF SCHEME OPERATION WITHOUT ADDItIONAL BOILER and
floor heating ................................................................................................................................ 13
8. BOILER BURNING AND KINDLING .................................................................................. 13
8.1. THE MOST ECONOMICALLY FUEL BURNS DOWN IN THE BOILER WHEN IT IS
FULLY LOADED....................................................................................................................... 13
8.2. SETTING OF THE BI-THERMAL DRAUGHT REGULATOR.................................... 15
8.3 EVALUATION OF THE BOILER OPERATION........................................................... 17
8.4 BOILER CLEANUP AND MAINTENANCE................................................................. 17
9. ACCIDENT PREVENTION REQUIREMENTS.................................................................... 18
10. RISK ASSESSMENT.............................................................................................................. 20
10.1. HEAT HAZARDS ........................................................................................................ 20
10.2. PRESSURE HAZARDS............................................................................................... 20
10.3. POSSIBLE INTOXICATION....................................................................................... 20
10.4. REQUIREMENTS FOR CONNECTING OF ELECTRIC PARTS............................ 21

1. THE MAIN TECHNICAL DATA
Solid fuel heating boilers STROPUVA (hereinafter referred to as “the boiler”) are intended for various premises/rooms where a central heating
system is installed with radiators, heat water boiler for domestic purposes or floor coils or heaters, or all together for heating. The system can be both
with natural and forced circulation, closed or opened. The boiler is sold with a registered Bi-thermal draught regulator of our company.
* - Firewood containing more than 30 % moisture shall not burn at all and if burn – shall not endure the required temperature, the burning shall
be unstable. Combustion duration of fuel loading depend on its quality, outside and inside temperature, building quality and other factors.
** - By separate order we produce 1900 mm height boilers
*** - Brick dimensions of the chimney flue: 13x26=338 m
2
Solid fuel: firewood logs, timber waste, sawdust briquettes,
peat, coal
. Recommended fuel moisture:
≤30 %
*
BOILER TYPE
TECHNICAL DATA S7 S10 S20 S40 s10
**
s20
**
s40
**
Power (kW) 7 10 20 40 10 20 40
Heated area (m
2
)20-80 50-100 100-250 200-450 50-100 100-200 180-400
Fuel capacity (dm
3
)150 200 350 500 200 350 500
Amount of coal (kg) - - - - 75 130 220
Amount of firewood (kg) 15 25 50 80 25 50 80
Length of firewood till (cm) 35 35 45 55 35 45 55
Water amount in the boiler (l) 26 34 45 58 34 45 58
Maximum duration of one load of firewood (~ h) 28 31 31 31 31 31 31
Maximum duration of one load of coal (~ days) - - - - 4 5 5
Coefficient of useful operation (%) 91,6 91,6 91,6 91,6 91,6 91,6 91,6
Water pressure in the boiler, no more than (bar), maximum 2 2 2 2 2 2 2
Pressure protection valve is mounted (bar) 1,5 1,5 1,5 1,5 1,5 1,5 1,5
Flow of heated water (l/h) 200 250 500 1000 250 500 1000
Dimensions of load opening (mm) 70 70 70 70 80 80 80
Minimum cross-width of a chimney flue opening (cm
2
)
***
150 200 250 330 200 250 330
Distance between boiler bottom and chimney (mm) 1010 1430 1550 1550 1550 1695 1675
Chimney diameter (mm) 140 160 180 200 160 160 180
Height (mm) 1250 1900 2100 2100 1900 2100 2100
Diameter (mm) 450 450 560 680 450 560 680
Mass (kg) 100 185 231 315 196 246 333

2. BOILER DIAGRAM
.
1. Air valve
2. Bi-thermal draught regulator
3. Supporting stick
4. Air heating compartment
5. Smoke extraction flue
6. Switching valve
7. Air feeding pipe
8. Fuel load door
9. Air distributor
10. Fuel
9. 11 . Ash removal door
12. Lift cable with a ring
13. Hook
14. Heated water pipe
15. Return water pipe
16. Muff for thermometer
17. Muff for pressure
safety valve 1,5 bar
18. Concrete bottom
Fig. 2.1. Domestic solid fuel boiler STROPUVA.
1
4
5
6
7
8
9
10
11
12
13
14
15
16

1
7
2
3
18

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3. DESCRIPTION OF A STRUCTURE
The boiler (fig. 2.1.) is a steel cylinder covered by a steel cylinder of a bigger diameter, a
structure isinsulated. Bi-thermal draught regulator (2) is at the front side of the boiler (see for details
item No. 8.2). Heated water is between the cylinders. A structure has openings for loading of solid fuel
(8), ash removal (11) and smoke extraction flue (5). There are also openings for water supply (14 - 15),
thermometer (16) and pressure safety valve (17). Air heating compartment (4) for the improvement of
combustion quality and heating transmission is mounted on the upper part of a combustion
compartment. The boiler can be configured with grid bars and switching valve (6) for burning with
peat or coal.
There is a gap between a heating compartment and boiler walls through which smoke pours
so that the heat would be better transmitted. A telescope air feeding pipe (7) fits into a compartment
at the end of which the air distributor is fixed (9).
An opening for air injection and regulating valve (1) is at the upper part of a compartment. Upon
request, a concrete bottom with an insulating band is configured with the boiler (18). Lift cable (12)
with a ring of the air feeding mechanism is placed at the right side of the boiler in front of the door (a
fixing hook (13).
The purpose of the air distributor is to distribute correctly the air in the generation zones
below and near the air distributor, at the combustion zone near and above the distributor. Air
distributor leans upon the side firewood logs which do not get heated up to a high temperature.
It is no allowed to move a distributor during the combustion: after moving the air distributor up
and down, it turns and sinks deep into the combustion place and then the boiler operation is
uneconomic, its parts worn out more.
4. TRANSPORTATION AND WAREHOUSING
Boilers are allowed to be transported unfastened only in a horizontal position. If it does not rain,
it is allowed to transport with an open transport, in other cases it must be transported with a covered
transport. When transporting in a vertical position additional protection measures must be taken so that
the boilers won‘t fall and scratch. Boilers can be stored in dry premises free of chemical active agent
steam.
5. BOILER FITTING
The boiler is fitted in the premises corresponding to the state requirements established for the
premises of boiler houses.
Premises where a boiler will be fitted must be at least 215 m in height and with concrete flooring
(at least in that place where the boiler will be erected). Premises must be made watertight and protected
from heated residential rooms and would have a vertical ventilation channel and window or opening in
the outside wall so that he air from outside would pass into the boiler and ventilation channel.
Using a mirror examine the inside of the chimney flue through the chimney flue cleanup opening.
The chimney flue must be clean. There must be no fittings nor bird nests and unsealed openings
leading to cavity ceilings and adjacent mines. It is verified whether the chimney flue does not have
openings or cracks in the outside through which the parasitic air can pass which will cool the chimney
flue and reduce its draught. Cracks, openings and a place where the boiler is connected to the chimney
flue must be sealed. If there are inner openings in the chimney flue leading to ceilings or adjacent
mines/shafts and there is no possibility to repair them, an oval or cylinder insert of stainless steel must

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be fitted in. (Rectangular inserts are not reliable due to cracks formed in connection places due to
temperature changes).
The boiler is erected straight on concrete floor; any cracks between the floor and the boiler are
sealed with heat resistant silicone or lime-cement solution with sand or other materials. The boiler can
be erected on a concrete bottom intended for fitting with an insulation rope.
During carrying sometimes parts of the boiler get deformed therefore when it is fitted into the
chimney flue and after closing all the doors and also the opening of the chimney flue cleanout opening,
check the operation of the upper valve, its nestling against surface of the air intake opening and doors
insulation using the flame of a candle or match.
5.1. FIRE REQUIREMENTS
The boiler is erected on a non flammable base. Metal connection of the boiler near the chimney
must be produced from metal not thinner than 1,5 mm and coated with heat insulation materials. The
condition of the chimney flue must be checked once per month (by examining it during the day time
through the cleanup opening with a mirror), in the event of necessity – clean it since soot and tars build
up in the chimney flue can ignite, throw the sparks, cause fire hazard, overheat or damage the insert.
Using branded chimney flues (of stainless steel or ceramic), study the users’ manual and fulfill the
requirements, cleaning periodicity in particular. When the chimney flue is cleaned up, a horizontal flue
between the boiler and chimney flue must be cleaned up either.
5.2. REQUIREMENTS FOR THE CHIMNEY FLUE
The cross-width of the chimney flue opening can be 10 percent less as it is specified in the main
technical requirements but not bigger. The boiler requires an individual chimney flue; any other
devices cannot be connected to it. So that the formed condensate in the chimney flue would not get into
the boiler, a flue from the boiler to the chimney flue must be horizontal and not longer than 1.5 m and
not shorter than 0.20 m, well sealed and insulated with a heat insulation material in the connection
places. Flue and chimney flue is periodically cleaned up considering the mentioned above fire
requirements.
It is recommended:
•to fit in the chimney the insert of stainless steel; an orderly and correctly fitted insert
protects the chimney against the effect of condensate or moister;
•an insert must not minimize significantly the cross section of the chimney opening; parts of
the insert must be tightly interconnected (with stainless steel rivets);
•ash collector must be mounted below, collector must be mounted 15-20 cm below the flue
connection to the chimney flue; then the flue can be easily cleaned up through it;
•the gap of the chimney between an insert and chimney walls, at least outside the chimney,
fill with inflammable insulation materials. At the top a crack must be hermetically plastered and
tin coated with a slope (from the opening to the chimney side);
•the chimney at the cold loft must be sealed with inflammable insulation materials.

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5.3. REQUIREMENTS FOR CONNECTING TO THE HEATING SYSTEM
It is allowed to fit in the boiler by qualified technicians who are aware of all requirements and
who give guarantees on their job, and every time consults our boiler operating manual. Our product is
not very similar to previous structures. Therefore what fits to other boilers does not fit to it.
For instance, boilers where combustion runs below a firebox, it is recommended an intense
return of the heated flow. It does not fir to our coiler.
If up-to-date elements of heating systems in the connecting diagrams of other boilers are used
very diversely and various and complicated connection diagrams are recommended we recommend
only several simple, cheap and justified diagrams.
During fitting procedure of supplement elements, please read the manufacturer requirements and
follow them:
1. According to recommendations of thermal valve manufacturers, set pre-flow valves
according to the instructions of the heating system design (if it is not the case, then at 1.5 or 1).
2. Do not exceed heat flow through the floor temperature with floor heating automatic
elements (recommendations of manufacturers: 28 – 35ºC).
3. Upon fitting three-stage or four-stage mixing valves and a circular pump so that
elements of the boiler and heating would not be shunted mount on a large ring of the house heating
system. Preferably on a reversible flow pipe.
4. As it usually happens, do not shunt elements of the boiler and heating in parallel to a hot
water heater connected to the boiler (a balance valve is required when connecting a hot water heater in
parallel).
5. Maintain the temperature sufficient to a good boiler operation (70 ÷ 85ºC).
6. Follow the recommendations of the chimney flue insert producer.
7. It is not allowed to fit the chimney flue closing valve. To reduce its draught, use our or
other producers’ self-intake air valves.
8. Take care of proper ventilation in a boiler room.
9. Every time when fitting our solid fuel boiler look at the technical certificate (useful
additions and recommendations are possible).

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6. MOUNTING PICTURE OF SOLID FUEL BOILER STROPUVA S40 NODE
WITH THE LOST OF PARTS
No. Plumbing detail Unit (s)
1 * - Pressure safty valve 1
2 Automatic air vent 1
3 Balance valve D15 1
4 Transition D25 – 15 3
5 Trident D25 11
6 Trident D25 – 15 2
7 Clutch D25 1
8 Nipple D25 18
9 Collapsible connector D25
SME 2
10 Bend D25 SME 3
11 Transition D32 – 25 2
12 Spherical valve D25 SME 3
13 Bend D25 2
14 Thermostatic valve DT25 1
15 Subjugation set of circulation
pump 7
16 Circulation pump 1
17 Brass disk bolt D25 2
18 Release and complement
valves D15 2
19 Three way valve for flow
distribution D25 1
R- to/from radiator (s),
F- to/from floor heating,
B- to/from boiler,
K2 - to/from other solid fuel boilers
Nodes for boilers s7, s10, s20 are collected from
D20. Node for boiler s40 is collected from parts
D25.
ATTENTION:
-1,5 bar pressure safety valve involves into the
opening (17) (fig. 2.1.). Instead trident (5), use a
bend D25 SME (10) (fig. 6.1.).
Fig. 6.1. Plumbing node.

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6.1. HEATING SYSTEM SCHEME

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6.2. DESCRIPTION OF HEATING SYSTEM SCHEME OPERATION
The pump (P) pumps the water out of the heating elements and pushes it through the boiler into
the heating elements (see scheme 6.1.). Through balance faucet (bk l) the heated water flows into the
nearest radiator, which can operate in a self-flowing manner to protect the boiler from overheating
(radiator without a thermo valve) in case the power went off.
Hereafter the heated water flows through the non solid fuel boiler 2k (if such is available), which
turns on as the boiler 1k stops burning or turns off when the boiler 1k is supplying the hot water
thanks to internal automatics. If the boiler 2k is available the bolt (3) is turned off, if it is not – the bolt
is turned on.
Hereafter the heated water flows through the water heater (B) and the bolt (3). If the heater input
is of a sufficient diameter, the bolt (3) is turned off – as the water flows only through the heater, more
water is heated. After it has heated the domestic water, the thermofication water flows into the ratiator
systems and through the thermostatic valve (T2-20-50) if required and gets into the floor heating
system. The thermostatic valve sensor opens the valve up if the water is colder than indicated (35°C)
and closes it if the water is warmer.
Thanks to the pump (P) the water abundantly circulates through the floor heating coil pipes (F) and
also flows into the boiler through theflow distribution valve (T-3-20-50), which, due to the sensor,
directs a part of the colder flow into the radiatior system as the returning flow is warmer that indicated
(40°), maintaining a stable premise warmth even if no thermo valves are available and protecting the
floor from overheating. (bk2) and (bk3) are the closure valves (not the faucet with spherical rotating
closure) or more improved flow determination valves, through which the pump flow is distributed in
such manner that it would be sufficient enough for floor heating and appropriate for the pump. Overall
flow amount depends on the circulation pump and might be controled by switching the pump speed
positions.
If the system do not has floor heating T2, it is not necessary to install the thermostat during the
summer. Creating a solid fuel boiler for heating boiler, radiator and floor manifold close and open the
T2 from the unscrew the cap or removing the thermostat.
A circulation pump with the power of 25 – 60 W is enough for a 10kW boiler, 40 - 80 W for a 20
kW boiler and 50 – 100 W for a 40 kW boiler. (bk1) - a balance faucet of a safety auto flow radiator,
through which the flow is determined to make the radiator reversible pipe 40°C cooler than the
infusion pipe. (7) - collapsible connectors – by releasing them the node may be reversed to another side
of the boiler.

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7. MOUNTING PICTURE OF SOLID FUEL BOILER STROPUVA S40 NODE
WITH THE LOST OF PARTS
No. Plumbing detail Unit (s)
1 * - Pressure safty valve 1
2 Automatic air vent 1
3 Balance valve D15 1
4 Transition D25 – 15 2
5 Trident D25 7
6 Trident D25 – 15 3
7 Clutch D25 1
8 Nipple D25 11
9 Collapsible connector D25
SME 2
10 Bend D25 SME 3
11 Transition D32 – 25 2
12 Spherical valve D25 SME 3
13 Bend D25 2
14
15 Subjugation set of circulation
pump 7
16 Circulation pump 1
17 Brass disk bolt D25 1
18 Release and complement
valves D15 2
19 Three way valve for flow
distribution D25 1
R- to/from radiator (s),
B- to/from boiler,
Fig. 8.1. Plumbing node. Nodes for boilers s7, s10, s20 are collected from
D20. Node for boiler s40 is collected from parts
D25.
ATTENTION:
-1,5 bar pressure safety valve involves into the
opening (17) (fig. 2.1.). Instead trident (5), use a
bend D25 SME (10) (fig. 7.1.).
Fig. 7.1. Plumbing node without
floor heating and other boiler.

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7.1. HEATING SYSTEM SCHEME WITHOUT ADDITIONAL BOILER AND FLOOR HEATING

13
7.2. DESCRIPTION OF SCHEME OPERATION WITHOUT ADDITIONAL BOILER AND
FLOOR HEATING
The pump (P) pumps the water out of the heating elements and pushes it through the boiler into
the heating elements (see scheme 7.2.). Through balance faucet (bk l) the heated water flows into the
nearest radiator, which can operate in a self-flowing manner to protect the boiler from overheating
(radiator without a thermo valve) in case the power went off.
Hereafter the heated water flows through the non solid fuel boiler 2k (if such is available), which
turns on as the boiler 1k stops burning or turns off when the boiler 1k is supplying the hot water
thanks to internal automatics. If the boiler 2k is available the bolt (3) is turned off, if it is not – the bolt
is turned on.
Hereafter the heated water flows through the water heater (B) and the bolt (3). If the heater input
is of a sufficient diameter, the bolt (3) is turned off – as the water flows only through the heater, more
water is heated.
After the heating domestic water, thermofication water flows to the radiator system.
Thanks to the pump (P) the water abundantly circulates through the flow distribution valve (T-
3-20-50), which, due to the sensor, directs a part of the colder flow into the radiatior system as the
returning flow is warmer that indicated (40°) , colder part of the flow refers to the radiator system, and
maintained a stable indoor heat, even in the absence of thermovalves.
A circulation pump with the power of 25 – 60 W is enough for a 10kW boiler, 40 - 80 W for a
20 kW boiler and 50 – 100 W for a 40 kW boiler.
(bk-1)- a balance faucet of a safety auto flow radiator, through which the flow is determined to
make the radiator reversible pipe 40°C cooler than the infusion pipe.
(7) – collapsible connectors – by releasing them the node may be reversed to another side of the
boiler.
8. BOILER BURNING AND KINDLING
8.1. THE MOST ECONOMICALLY FUEL BURNS DOWN IN THE BOILER WHEN IT IS
FULLY LOADED
Switching valve (6) when burning firewood logs must be lowered, when coal is burning – it must
be lift up (see fig. 2.1.). When loading fuel, the air distribution (9) must be lifted up; therefore take a
ring at the cable end (12) hanging in the right above the firebox doors, pull down and put on a hook
(13). Use the air distributor (9) (see fig. 8.3.) then heating firewood.Load firewood logs horizontally:
longer one - in the middle and shorter - at the side. It is useful to fill spaces between firewood logs with
sawdust or fine tree waste.
Fig. 8.1. Grid bars for coal and peat turf firing

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When loading coal, use grid bars (see fig. 8.1.), open by pulling up the air valve for coal and peat
turf to clean up ash and slag. Load lump coal, larger coal like a computer mouse cut into smaller
pieces. Do not load any other fuel; only at the top of coal load about 2 kg of dry chipped firewood logs.
Use a pipe air distributor (fig. 8.4.) for burning small coal, a boiler with small coal operates at 50
– 70% lower mode therefore use small coal during warmer days. When loading peat turf, firstly load
large briquettes and then fine peat turfs. After loading with firewood logs, immediately make fire so
that the load would not ignite from remaining embers.
Before firing the boiler, read the manual of draught regulator, check whether a pike of a
regulating screw is in the sag, supporting bar emboss is in its opening and by turning a regulating screw
open an air control valve for 3-5 cm (1).
Kindle the top of the load; slightly close the door leaving a gap of 2-5 cm. When fuel burns up,
close the door and unhook a ring (12) with a lifting cable (13). Liquid fluid used for firing of fireplaces
and ovens can be used for firing of the boiler however it can not be used during combustion. It is not
allowed to pass the air through the lower ash cleaning doors.Open a window or a special opening
outside the boiler wall during boiler burning so that the boiler would intake the air from outside.
When burning coal, do not kindle the boiler. When burning firewood logs during combustion the
boiler can be loaded with firewood logs and bulky tree waste: before that lift up the air distributor and
open the door. During boiler operation it is dangerous to open the doors widely – flame can burn the
face. Therefore at the beginning do not look inside the boiler and keep yourself away, open the firebox
doors only for 2-3 cm and only after 20-30 sec. open the doors and load firewood logs but no more
than two layers (20-30cm), close the door and pull down the air distributor.
After additional loading, combustion quality and economy get worse for a short time therefore
we recommend to do it so that to extend the combustion duration until the next suitable loading and
burning.
Using wet firewood logs or any other timber fuel or its waste, it is recommended to use the air
injection collector and to improve combustion by putting layers of other timber fuel with dry firewood
logs. When burning coal or peat turf, the injection collector is required. Always the load of any other
fuel is fired up though the upper doors (8).
ATTENTION!
The air injection collector is switched on only when the doors are closed when the fire is made.
The sensor of the chimney flue (with a thin capillary 200-300ºC) must be fitted into a flue and water
sensor (70ºC) - between the body and sealing material.
Fig. 8.2. Air injection collector and it’s fastening of universal domestic solid fuel boiler. View from the top.

15
Fig. 8.3. Air distributor for firewood logs, timber waste, sawdust briquettes.
Fig. 8.4.Tubular air distributor for coal or peat briquettes.
8.2. SETTING OF THE BI-THERMAL DRAUGHT REGULATOR
The operation method of this regulator is based that when the body of the boiler becomes
warmed - it expands, the body itself slightly close or close a valve (1) through a lever (4) and when
getting cooler - shrinks and opens (fig. 8.5.).
When the boiler is brought into a boiler room and is connected to the pipeline of the heating
system, take off a transportation strip and check whether draught regulating parts are not deformed:
support bar (3) mount on the boiler, the emboss of its metal part (5) must be in the valve lever (4) pore
and the temperature setting screw (2) spike - in the sag of a lever (4). The sag and pore are near each
other at the distance of 3.5 mm.

16
Fig. 8.5. Bi-thermal draugth regulator.
Check whether a valve completely closes air ducts, its screw is loose and do not screw it. With a
support screw set a valve at 3-5 cm distance from the air injection opening, only then fire up the boiler
(see figure below).
Fig. 8.6. Distance (3-5 cm) between the valve and air injection opening during firing.
When metal and water becomes warmer, the boiler cylinder gets longer and lowers down the
valve. When temperature indications show not less than 80º C, open the valve with a temperature
regulation screw (2); and for higher indications – slightly close until temperature reaches 80° C. Later
seeking to set a lower temperature, turn a ring towards smaller figure. A ring cannot be turned behind
the biggest figure (if turned more, overheating and water boiling are possible).

17
8.3 EVALUATION OF THE BOILER OPERATION
If after the fire up the boiler operates well, and later its capacity and draught decreases, it means
that the chimney flue is insufficiently tight: check whether the doors of the chimney flue cleanup are
closed or there are any other problems of tightness - remove them.
If after the burn up rhythmical noise is heard in the boiler and sometimes smoke erupts, it means
that the draught of the chimney flue is too strong – the boiler has no capacity and his operation is
uneconomic. In this case the air must be injected into the chimney flue through a special opening in a
horizontal connection. Turn a lever in the clockwise direction so that pulsing of a boiler would
disappear (see a diagram of the chimney flue).
If fuel burns well but the temperature indicator slowly raises up and condensate leaks from the
chimney flue, it means that the heated water flow is exceeded: switch on a circular pump into the
lowest position and reduce a flow by the boiler balance tape or flows in the heating elements till the
condensate stops leaking from the chimney flue and the boiler temperature indicator reaches 70 – 80ºC.
8.4 BOILER CLEANUP AND MAINTENANCE
When firewood logs are burnt, ashes from the boiler must be removed every month. When
burning peat or coal, ash must be cleaned every month before firing. It is natural that the inner walls of
the boiler are slightly coated with tar but if the draught of the chimney flue is bad, if air passes through
the under part or lower doors, if during combustion the boiler is kindled and the air distributor is
moved, if the heated water flow is too intense too much tar could be build-up and the boiler can be
clogged. Therefore all the said defects must be eliminated. When the draught is reduced, heat
detraction cracks between the air heating compartment (2) and inner walls of the boiler must be
checked and cleaned up. They can be cleaned with a flexible brush through the inner smoke opening
above the fuel firebox door. It is more convenient to clean through a smoke discharge opening (after
dismantling a connection with the chimney flue) or through a special opening in the connection. The
boiler shall not clog if the heating system is correctly mounted; chimney flue is in a good order
and is used following the recommendations of the manual. Air distributor is lowered, can scoop up
old ash therefore their cracks must be sometimes checked and cleaned up.
If a crack between the lower plates is reduced or disappear, it must be restored after dismantling
of the distributor. A cable of the lifting mechanism must be lubricated so that it won’t get warn and the
distributor would be lifted up more easy. We recommend lubricating the door closing hooks either.
Sometimes it must be checked whether the sealing of the doors and a place between the concrete floors
and the boiler is in a good condition. Remove the problems of sealing using heat resistance materials
mentioned above. So that the doors would be closed tightly, sealing materials should be replaced.

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9. ACCIDENT PREVENTION REQUIREMENTS
The boiler is a zone of increased hazard. If behaving irresponsibly, it is possible to get hurt,
poisoned, make a fire, spoil the boiler or heating system.
SAFETY REQUIREMENTS AND
PROHIBITIONS
CONSEQUENCES IF NOT FOLLOWING
PROHIBITIONS
AND MEASURES
Do not boil water in the boiler
If water boils away, the boiler will overheat and will
crack. If the boiler boiled up due to a reason which is
not known to you, keeping the face away from doors,
open them and pour water into a firebox.
Do not kindle the boiler without water. Do not exceed
pressure in a system over 1.5 bar. Do not freeze water
in the heating system and boiler.
Spoilage of boiler and other heating
system parts
Air from outside must get into a boiler
room
It is possible to get poisoned besides the boiler does
not operate – open a window in a boiler room or inject
the air into a boiler room otherwise.
Do not pass the air through a lower
door and do not load firewood logs
through the under part
Condensate shall leak; more firewood logs will be
consumed. Water will boil up in the boiler, coal will
drop down.
Do not store fuel in the boiler (after
loading firewood logs must be ignited)
Fire wood will burn up from the remaining ember and
will fume useless leaving the condensate and tars.
Do not move the air distributor during
combustion
While stabbing the air distributor softened from heat
on to the firewood logs, it will become folded and if
sinked deeper into fuel - will get worn from heat more
rapidly.

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MOST FREQUENT FITTING MISTAKES CONSEQUENCES/ REMOVAL
It is fitted according to the diagrams of
other boiler manufacturers where it is
provided the return of a big amount of
heated water to a reversionary flow as if it
removes a negative effect of the condensate
Intense flow sufficiently cools combustion
compartments and smoke crack walls so
that moister shall be discharged on them
though it is dried while heating but glues
ash onto the walls therefore the boiler and
chimney flue periodically clog.
Set a recommended flow – moister shall
accumulate below a combustion fireplace –smoke
cracks will be always clean
Circular pump together with the boiler
is fitted in the old system where elements
are not regulated
Due to an intense flow of cool water a lot
of condensate is discharged, a poisoned
smell of condensate gets into a boiler room
and the boiler running is such uneconomical
that it lacks its capacity.
Mount a balance tap in front of the boiler
or mount a boiler room according to
diagram 2.
COMMON MISTAKES OF USE
It is burned when the chimney flue
draught is too strong
Pulsing is heard in the boiler, sometimes
air valve is jumping. The boiler operates
very uneconomically, condensate leaks, it
lacks capacity. Turn the valve regulating lever up in
the chimney flue and fix up so that the draught shall
easily open the air injection valve. If you purchased
the boiler without a chimney flue connector, it is
sufficient to cut a U form section in the ledger and
gradually unbent the formed “tongue” till the boiler
operation becomes stable.
Air distribution lifting cable is not
lubricated.
Air distributor is lifted heavily, cable gets
worn. Must be lubricated with lubricant
WD – 40 or grease
Package plastic waste and card-board
boxes are burnt in the boiler
If packing cartons retard combustion,
then to combust plastic construction or
packing waste is dangerous since generated
gas does not combust evenly, their excess
accumulates the explosion of which in the
chimney or boiler dismantles chimney flue
connectors.
Lower than 60ºC boiler temperature is
maintained
The boiler and chimney flue are clogged
due to condensate.

20
10. RISK ASSESSMENT
10.1. HEAT HAZARDS
Upon touch of hot boiler elements, it is possible to get burnt. The surface of the boiler which can
be heated up to 40º C temperature and other parts according to technical characteristics are insulated
with heat insulation but there are such parts like door handles and doors which are heated more and are
hazardous to humans. Such places are marked with an international danger mark. Hot water pipes of
the heating system after hydraulic testing must be insulated with heat insulation. Pressure valve escape
pipe must be lead up to sewerage or vessel by leaving a 10 cm gap for monitoring and insulated with
heat insulation or marked with a heat hazard mark.
10.2. PRESSURE HAZARDS
Increase of pressure is possible: when electric power fails and circular pump stops, the boiler is
not refilled with cold water from a system and temperature reaches the dangerous level then the
draught regulator gets actuated by closing a valve at the set temperature mode, not letting air in and
extinguishing the boiler. Temperature can reach the critical level of 100° C from inertia but water will
not boil in the boiler since thanks to a combustion method a small layer of burning firewood logs upon
an automatic closure of the air valve quickly goes down. If the air closing valve is deformed or due to
other violations of operation rules (for instance, the door from ash cleaning is open) water in the boiler
can start boiling. However the pressure protection valve mounted on the upper pipe of the feeding flow
near the boiler easily releases vapor and does not exceed pressure, allows the boiler to get replenished
with water from a reversionary water flow pipe from a system and to cool down.
Under improper use: for instance though the air is injected through a lower door into the boiler
due to the intensive combustion in the boiler its capacity is exceeded several times so the boiler can
boil water and if overheated crack up from normal pressure.
The boiler can also crack up from too high pressure, if a pressure protection valve of higher
pressure will be mounted in an improper place or clogged. As calculations and practice prove the boiler
will never explode to the outside but crack up inside therefore there is no hazard for human health or
life.
10.3. POSSIBLE INTOXICATION
When the chimney flue is clogged or when cleaning from ash, carbon black monoxide can be
formed in a boiler room therefore natural exhaust ventilation is required and for its operation the
influent ventilation is required too, i.e. the opening or opened small window in the outside wall of a
boiler room. If there is no influent ventilation the boiler shall not operate. Therefore do not forget to
install the inflowing ventilation in the boiler wall of a boiler room directly from outside. The door of a
boiler room must be tightly closed so that when an emergency sanitary unit or kitchen ventilation are
switched on the operation of the boiler shall not be disturbed and dust or carbon black monoxide shall
not pass from a boiler room into residential rooms.