SENKO SN-EN-08 User manual

Central heating
FIREPLACES
Central 20-25 kW, Central 30-35 kW
SN-EN-08/13

SENKO fireplaces –Instruction manual 1
Dear client, thank you for choosing a SENKO fireplace !
This product was designed and manufactured to its minutest
details in order to fulfill your every need for functionality and
safety.
This Instruction manual will teach you to operate your fireplace
properly, so please read the manual carefully before using the
fireplace.
Senko management
Symbols used in this INSTRUCTION MANUAL :
ATTENTION WARNING
SAFETY ADVICE AND RECOMMENDATIONS

SENKO fireplaces –Instruction manual 2
CONTENTS
1. GENERAL .............................................................................................4
1.1. FUEL ................................................................................................5
1.2. FEEDING ..........................................................................................5
1.3. CHIMNEY ..........................................................................................6
1.3.1. CHIMNEY CAP ...........................................................................6
1.3.2. CHIMNEY FUNCTION ..................................................................8
1.4. INSULATION ...................................................................................10
2. WARNINGS AND SAFETY .................................................................10
3. TECHNICAL FEATURES ....................................................................11
4. INSTALLATION ...................................................................................14
4.1. POSITIONING .................................................................................14
4.2. CHIMNEY PREPARATION AND CONTROL .......................................16
4.3. CONNECTING TO CHIMNEY............................................................16
4.4. FRESH AIR VENTS..........................................................................18
4.5. CENTRAL HEATING SYSTEM CONNECTION ...................................18
4.5.1. FIREPLACE THERMAL PROTECTION ...........................................20
4.5.1.1. Thermal two-way safety valve.................................................21
4.5.1.2. Thermal safety valve ............................................................22
4.5.1.3. Anti-freezing protection .........................................................23
4.5.1.4. Heat exchanger ..................................................................24
4.5.2. INSTALLATION TESTING ...........................................................25
4.5.3. RECEIVING AND MAINTAINING THE INSTALLATION .......................25
4.6. FIREPLACE LINING .........................................................................26
4.6.1. LININGS ..................................................................................26
4.6.2. AIR VENTS ..............................................................................26
4.6.3. DECORATIVE BEAMS ................................................................26
4.6.4. FIRE PROTECTION ...................................................................26
5. HANDLING THE PRODUCT ...............................................................28

SENKO fireplaces –Instruction manual 3
5.1. AIR ADJUSTMENT AND REGULATION..............................................28
5.2. FIRING ............................................................................................29
5.2.1. PROCEDURE ...........................................................................29
5.2.2. OPTIMUM USE VALUES .............................................................29
5.2.3. ADDING FUEL ..........................................................................30
5.2.4. FEEDING IN TRANSITION PERIOD ...............................................31
5.2.5. SPACE HEATING.......................................................................31
6. CLEANING ..........................................................................................32
6.1. GLASS CLEANING ..........................................................................32
6.2. ASH CLEANING ..............................................................................33
6.3. CHIMNEY CLEANING ......................................................................33
7. MAINTENANCE ..................................................................................34
7.1. FIREBOX MAINTENANCE ................................................................34
7.2. MAINTENANCE DURING SUMMER ..................................................34
7.3. AUTOMATIC REGULATOR...............................................................34
7.4. OLD FIREPLACE DISPOSAL.............................................................36
7.5. SPARE PARTS.................................................................................36
8. MALFUNCTIONS / CAUSES / SOLUTIONS ......................................36
9. TECHNICAL SUPPORT ......................................................................38
10. TECHNICAL DATA .............................................................................39
11. TERMS OF WARRANTY ....................................................................40
WARRANTY ..............................................................................................41
INSTALLATION REPORT .........................................................................42
CE MARKING ............................................................................................43

SENKO fireplaces –Instruction manual 4
1. GENERAL
Solid fuel central heating fireplaces with glass door
E2284 Central 20-25 kW
E2285 Central 30-35 kW
are models from the SENKO fireplaces palette which can accommodate
your needs in the best possible way. Therefore, we ask you to CAREFULLY
READ THESE INSTRUCTIONS, which will help you to achieve the best
possible results already during the initial use.
The manufacturer is not responsible for any consequences (people
or animal injuries or property damages) resulting from failure to comply
with this Manual.The fireplace is hot during operation and the use of
protective heat insulated gloves is compulsory during handling.
Children and infirm individuals are not allowed to handle the fireplace.
The external appearance of the fireplace is shown on the first page of
this Manual. Fireplace principal parts are made of qualitative boiler sheets
and castings of quality grey cast. The fireplaces are produced with flue gas
connection point in the middle of the dome facing up. When ordering the
fireplace or the spare parts, it is necessary to state its full designation,
for example: fireplace E2284 Central 20-25 kW. The fireplaces are
manufactured and certified in accordance with the EN 13229 standard and
comply with all the requirements set by this standard
SENKO fireplaces are intended for space heating and central
heating!
The fireplace is packaged in a EURO pallet. During transport, the
fireplace must be properly fastened in order to prevent tumbling or
damages. The standard delivered fireplace set consists from:
fireplace with door,

SENKO fireplaces –Instruction manual 5
CF agent for removal of soot and grease from glass surfaces,
dome with a chimney excerpt and pipes for space heating excerpt,
instruction manual.
CAUTION! The fireplace weighs between 130 and 250 kg. Extra
caution is necessary when unloading, transferring, moving and
installing the fireplace in order to avoid physical injury.
1.1. FUEL
The use of moist and low-calorie wood is not recommended. The wood
moisture must be lesser than 17%. The energy content of moist wood is
low, at approx. 2,3 kWh/kg and it greatly pollutes the door glass, as well as
the chimney and the fireplace.
Use only recommended fuel :
wood: common beech, common hornbeam, oak, black locust
air dried for a minimum of 2 years
relative humidity 15-17%, energy content at approx. 4,2 kWh/kg
wood briquettes: energy content at approx. 4,4 kWh/kg
1.2. FEEDING
manually when necessary
we recommend the logs to be of 50 x 50 mm vertical cut, up to 2/3
of the firebox length
the minimum distance between the logs must be 1 cm, the same
distance of 1 cm applies for the briquettes
use smaller logs for a more intensive fire
it is necessary to use protective heat insulated gloves when
adding fuel to the firebox
protective heat insulated gloves must also be used when opening
and closing firebox door and removing ash box.

SENKO fireplaces –Instruction manual 6
1.3. CHIMNEY
The fireplace is connected to the chimney via standard 200 mm
diameter smoke venting pipe, directly to the chimney or with the knee 45°
and extension pipe. It is necessary to execute the connection of the rosette
and the chimney tightly and impermeably. If the fireplace is separated from
the chimney opening, the extension smoke inlet pipe must have an
appropriate incline and must not exceed 125 cm in length.
It is necessary to leave the revision opening for chimney cleaning,
connecting pipe and dome of soot. It is also necessary that the connection
elbow has the revision opening for cleaning on it.
We also advise to equip the chimney with solid material and
possible condensation products collection chamber and to install the
chamber in question beneath the smoke channel inlet, in a manner which
allows easy access and inspection via impermeable door.
1.3.1. CHIMNEY CAP
Chimney cap must fulfill the following prerequisites:
identical internal cross-section to that of the chimney,
operational exit cross-section no less than the double inner
cross-section of the chimney,
constructed to prevent rain, snow, leaves and other foreign
bodies from entering the chimney,
constructed to enable expulsion of combustion products in
case of wind from any direction and incline,

SENKO fireplaces –Instruction manual 7
installed to enable proper dispersion and dilution of
combustion products outside the reflux zone (backflow)
because the counter pressure occurs here. Therefore, it is
necessary to adhere to limitations listed in figure 1,
mechanical appliances for flue gases suction are not allowed.
Roof
slope
Distance between the
roof ridge and the
chimney
Minimum chimney height
(measured from the roof
surface)

A, m
Hmin, m
15°
< 1,85
0,5 m above the roof ridge
> 1,85
1 m from the roof
30°
< 1,5
0,5 m above the roof ridge
> 1,5
1,3 m from the roof
45°
< 1,3
0,5 m above the roof ridge
> 1,3
2 m from the roof
60°
< 1,2
0,5 m above the roof ridge
> 1,2
2,6 m from the roof
figure 1
Z=REFLUX ZONE
PITCHED ROOF
FLAT ROOF

SENKO fireplaces –Instruction manual 8
1.3.2. CHIMNEY FUNCTION
Among all the meteorological and geographical factors that influence the
chimney function (rain, fog, snow, insolation period, etc.) the wind is most
certainly the crucial one. Apart from the pressure caused by the
temperature difference between the flue gases and the outer chimney air,
there is another type of pressure –wind dynamic pressure.
Ascending wind ALWAYS has the effect of increasing the pressure,
i.e., underpressure (flue draught), provided the chimney is properly
installed. Descending wind ALWAYS has the effect of decreasing the
draught overpressure occurs. Apart from wind direction and velocity,
chimney position in relation to the house roof and surrounding area is also
important (figure 2).
figure 2
wind
Unfavorable
position
Favorable
position
Horizontal wind 8 m/s
underpressure of
30 Pa
Descending wind under
45  angle and 8 m/s 
overpressure of 17 Pa
Flue
gases
from the
fireplace
High (positive)
pressure zone
OVERPRESSURE
Low (negative)
pressure zone
UNDERPRESSURE

SENKO fireplaces –Instruction manual 9
The wind also influences the chimney function indirectly by creating
areas of high (overpressure) and low (underpressure) pressure, both inside
and outside the residential area (figure 3).
Pressure that facilitates chimney function can occur in rooms directly
exposed to the wind (B), but it can also adversely affect the chimney
through external pressure if the chimney is situated on the side exposed to
wind (A). Contrary to that, underpressure can occur in lee rooms (C),
adversely affecting functions of the chimney situated on the opposite side
(D) from the wind direction.
wind
descending
wind
A
B
C
D
figure 3
A-B zones in overpressure
C-D zones in underpressure

SENKO fireplaces –Instruction manual 10
1.4. INSULATION
The fireplace has to be insulated in the boiler area by at least 100 mm
thick stone wool.
2. WARNINGS AND SAFETY
When installing a fireplace, certain national and European regulations
have to be considered. Before starting using a fireplace, consult a chimney-
sweeper if your fireplace is attached to the chimney in accordance
with the regulations (the chimney-sweeper has to fill out the installation
report at the end of this manual).
A fireplace can be mounted only in rooms and in places where there
can be no risk caused by it or its position, construction circumstances or the
way of using it. Any electrical or gas installation in walls or ceiling near the
coating of the fireplace is forbidden. Special requirement for the room with
the fireplace is enough air in the room, so that there is enough air for a
good combustion.
A fireplace shall not be mounted in the following places:
staircase (allowed in apartment buildings with less than two
apartments),
hallways,
rooms with highly explosive and flammable substances and
materials or mixtures which can represent a potential flammable
risk,

SENKO fireplaces –Instruction manual 11
rooms or flats with air circulation or hot air circulation with
ventilation systems (air condition, extractor or kitchen hoods),
except if such ventilation systems have safety mechanisms,
which sustain the air pressure above 4 Pa in a room, where the
fireplace is mounted or in rooms which are in direct contact with
exterior air.
3. TECHNICAL FEATURES
SENKO fireplaces are made of quality boiler metal sheets. The water
container is located at the rear, on the sides and at the top. This is why
SENKO fireplaces have a high efficiency rate and can be mounted
combined with any other heating system.
At the bottom is an ash box, above it the firebox and at the top there are
tubes for room air heating.
Attachments for the central heating system are located on the rear side
of the fireplace.
Figures below are showing the supplied parts of the fireplaces.

SENKO fireplaces –Instruction manual 12
SCHEMATIC OVERVIEW OF FIREPLACE E2284 CENTRAL 20-25 kW
figure 4
THE KEY :
1. R1’’ cold water connection point
2. R1’’ warm water connection point
3. R3/4’’ safety valve probe connection point of the
boiler thermal protection
4. R1/2'' automatic regulator probe connection point
5. R1/2’’ inlet water connection point of the boiler
thermal protection
6. R1/2'' deaerating valve connection point
7. R1/2’’ outlet water connection point of the boiler
thermal protection
8. Secondary air inlet
9. Primary air inlet
10. Room heating tubes
11. Dome
12. Chimney connection point extension
13. Door handle
14. Primary air automatic regulator handle
15. Ash box
16. Firebox grate
17. Protective sheet
18. Primary air automatic regulator
19. Flue damper handle
20. Lower door handle
21. Inspection opening for dome cleaning
22. Opening for secondary air circulation
needed for firebox glass door
cleaning

SENKO fireplaces –Instruction manual 13
figure 5
SCHEMATIC OVERVIEW OF FIREPLACE E2285 CENTRAL 30-35 kW
THE KEY :
1. R5/4’’ cold water connection point
2. R5/4’’ warm water connection point
3. R3/4’’ safety valve probe connection point of the
boiler thermal protection
4. R1/2'' automatic regulator probe connection point
5. R1/2’’ inlet water connection point of the boiler
thermal protection
6. R1/2'' deaerating valve connection point
7. R1/2’’ outlet water connection point of the boiler
thermal protection
8. Secondary air inlet
9. Primary air inlet
10. Room heating tubes
11. Dome
12. Chimney connection point extension
13. Door handle
14. Primary air automatic regulator handle
15. Ash box
16. Firebox grate
17. Protective sheet
18. Primary air automatic regulator
19. Flue damper handle
20. Lower door handle
21. Inspection opening for dome cleaning
22. Opening for secondary air circulation
needed for firebox glass door
cleaning

SENKO fireplaces –Instruction manual 14
4. INSTALLATION
When attaching a fireplace to the chimney, you need to comply with
certain local, national and European regulations. A fireplace shall be
mounted by a qualified expert who has to make a written report –
installation report (at the end of this manual). Without such a report the
manufacturer will not acknowledge any warrantee (see Chapter 11).
When unpacking the fireplace, check for any possible damage that
might have occurred during transportation. When you notice any damage
on the supplied parts, immediately notify the manufacturer.
At all locations of the fireplace, where components can be attached to
(water, thermic protection, chimney, air pipe…) inspection openings have
to be mounted to ensure maintenance and servicing.
4.1. POSITIONING
A spirit level must be used to place the fireplace in a horizontal
position with no incline. The bottom part of the fireplace has to be
completely sealed (height of the concrete base should be at the ash box
guide) so there is no uncontrolled primary air outlet.
Please ensure a minimum distance between the fireplace and
potentially inflammable objects like wood, chipboard or cork. If there are
any more inflammable materials near the fireplace, like PVC or
polyurethane compounds, the safety distance has to be twice as big.
The minimum distance from inflammable surfaces in front of the
fireplace and behind it has to be 800 mm and 500 mm in other directions.
If you mount your fireplace on inflammable floor materials (wooden
floors i.e.), you have to mount the product on a 60 mm non-inflammable
insulation layer. The layer has to reach 800 mm in front of the fireplace
and 400 mm away in other directions (Figure 6).

SENKO fireplaces –Instruction manual 15
figure 6
range of firebox door opening

SENKO fireplaces –Instruction manual 16
4.2. CHIMNEY PREPARATION AND CONTROL
Prior to fireplace mounting, it is necessary to check the chimney –the
diameter, height, possible clogging or damages. The chimney must be
certified by an authorized local chimney-sweeper. The effective
chimney height must be at least 5 meters from the point of flue gases
outlet (figure 7b).
Flue draught must be within parameters:
for Central 20-25 kW 12 ± 2 Pa,
for Central 30-35 kW 15 ± 2 Pa.
The chimney must be at least 0,5 meters above the roof ridge. The
minimum distance between the two connections on the same chimney
must be 60 cm (figure 7d).
Chimney diameter is chosen according to information provided by the
chimney manufacturer –e.g., for flue draught of 15 Pa, the diameter is 200
mm and height 7 m.
The chimney must be smooth on the inside, well insulated and well
fastened. All cleaning hatches must be well fastened. All gaskets must be
regularly inspected and replaced when necessary.
4.3. CONNECTING TO CHIMNEY
When connecting the fireplace to the chimney it is necessary to adhere
to local, national and European regulations (norms) –DIN 4705.
It is necessary to ensure that the connection between the fireplace
and the chimney is executed tightly and impermeably. Smoke outlet
pipe must have a suitable incline in cases where the fireplace is
removed from the chimney opening.
Smoke outlet pipe must not penetrate into the chimney clear
opening (figure 7c).
Differences between the proper and improper connection of the fireplace
to the chimney are displayed in the following figure.

SENKO fireplaces –Instruction manual 17
figure 7
Differences between the proper and improper connection of the fireplace to the chimney
PROPER
IMPROPER

SENKO fireplaces –Instruction manual 18
4.4. FRESH AIR VENTS
The room where the fireplace is installed must be provided with
sufficient air inflow to ensure combustion. The area must be regularly
ventilated.
The fresh air vent must be situated near the room floor and allow the
inflow of fresh air into the room. The minimum dimension of the vent
must be 6 cm2per kW of nominal power (e.g. for 30 kW 180 cm2
10 x 18 cm vent).
A pipe can also be installed on the existing opening 150 x 80 mm (9) on
the rear side of the fireplace for the purpose of entering fresh outside air;
pipe Ø100 mm (for Central 20-25 kW), respectively pipe Ø150 mm (for
Central 30-35 kW).
4.5. CENTRAL HEATING SYSTEM CONNECTION
Prior to commencing the firing procedure, the fireplace must be
connected to waterworks and central heating system and the boiler must be
filled with water. Continuous circulation of water through the boiler
must be ensured. The boiler must be well deaerated prior to operations
commencement.
The pipe installation must be executed in accordance with valid
technical regulations and DIN 4751 norm –part 1 for open systems and
DIN 4751 –part 2 for closed systems, following professional standards,
and only by an authorized expert.
It is not allowed to reduce the diameter of the pipe connecting the
boiler to the heating installation connection point. Otherwise, the warranty
will be void.
Prior to connecting the boiler to the heating installation, the pipelines are to
be thoroughly cleansed from potential filth sediments. This prevents boiler
overheating, system noise, pump malfunctions and mixing valve malfunctions.
The connection to the heating system is executed via union flat joint, with
or without the mixing valve onto an open or closed system.

SENKO fireplaces –Instruction manual 19
Installation of an approved safety valve with opening overpressure
set to 2,5 bar is mandatory in closed systems. Safety and expansion
conduits must not have any kind of block elements.
It is necessary to install the deaerating valve. When filling the boiler
and the radiator system it is necessary to open the mixing valve, if one had
been installed; adequately deaerate the boiler and the heating system.
figure 8
Open central heating system
Closed central heating system