SENKO C-20 User manual

Central heating
COOKERS
C-20 and C-30
SN-EN-09/13

SENKO cookers C-20 and C-30 –Instruction manual 1
Dear client, thank you for choosing a SENKO cooker !
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 cooker
properly, so please read the manual carefully before using the
cooker.
Senko management
Symbols used in this INSTRUCTION MANUAL :
ATTENTION WARNING
SAFETY ADVICE AND RECOMMENDATIONS

SENKO cookers C-20 and C-30 –Instruction manual 2
CONTENTS
1. GENERAL…………………….………………………………………………4
1.1. FUEL……………………………………..………………………………..6
1.2. FEEDING………………………………………………………………….6
1.3. CHIMNEY………………………………………………………………….7
1.3.1. CHIMNEY CAP ……………………………………………………...7
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 …………………………..15
4.3. CONNECTING TO CHIMNEY …………………………………………..15
4.4. FRESH AIR VENTS ……………………………….……………………18
4.5. CENTRAL HEATING SYSTEM CONNECTION ………………………...18
4.5.1. COOKER 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
5. HANDLING THE PRODUCT ……………………………………………..26
5.1. DIRECTING THE FLUE GAS …………………………...............…..…26
5.2. AIR ADJUSTMENT AND REGULATION..............................................26
5.3. FIREBOX GRATE.............................................................................28
5.4. FIRING ……………………………...………………………………..…29
5.4.1. PROCEDURE……………………………………………………...29

SENKO cookers C-20 and C-30 –Instruction manual 3
5.4.2. OPTIMUM USE VALUES …………………………………………...30
5.4.3. ADDING FUEL …………………..…………………………………31
5.4.4. FEEDING IN TRANSITION PERIOD ……………………………..….32
6. CLEANING……………………………...…………...............................…32
6.1. CLEANING THE COOKER.................................................................32
6.2. CLEANING THE FLUE GAS CHANNEL..............................................33
7. MAINTENANCE ………………………………………........................…33
7.1. AUTOMATIC REGULATOR...............................................................34
7.2. FIRING REGIME SWITCH MECHANISM............................................35
7.3. OLD COOKER DISPOSAL …………………...........................……….35
7.4. SPARE PARTS ……………………………….…………………………35
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 cookers C-20 and C-30 –Instruction manual 4
1. GENERAL
Solid fuel central heating cookers without oven
E2320L C-20 inox lux
E2320D C-20 inox lux
E2330L C-30 inox lux
E2330D C-30 inox lux
are models from the SENKO cookers 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 cooker 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 cooker.
The external appearance of the cooker is shown on the first page of this
Manual. Cooker principal parts are made of stainless steel boiler plates and
castings of quality grey cast. The cookers are produced with flue gas
connection point on the left or the right side. When ordering the cooker or
the spare parts, it is necessary to state its full designation, for
example: cooker E2320D C-20 inox lux; which means that the flue gas
connection is on the right side, if the stove is observed frontally.
The cookers are manufactured and certified in accordance with the EN
12815 standard and comply with all the requirements set by this standard.
These SENKO cookers are intended for cooking, space heating and
central heating !

SENKO cookers C-20 and C-30 –Instruction manual 5
23
24
25
26
figure 1
The cooker is packaged in a EURO pallet. During transport, the cooker
must be properly fastened in order to prevent tumbling or damages. The
standard delivered cooker set consists from:
cooker,
instruction manual,
chimney terminal extension (23),
firing regime adjustment –grate lifting spanner (24),
cooker cleaning tool (25),
CF agent for removal of soot and grease from glass surfaces (26).
CAUTION! The cooker weighs between 150 and 200 kg. Extra
caution is necessary when unloading, transferring, moving and
installing the cooker in order to avoid physical injury.

SENKO cookers C-20 and C-30 –Instruction manual 6
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 cooker.
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
use smaller logs for a more intensive fire, and more massive logs to
maintain fire
the minimum distance between the logs must be 1 cm, the same
distance of 1 cm applies for the briquettes
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 the ash box

SENKO cookers C-20 and C-30 –Instruction manual 7
1.3. CHIMNEY
The cooker is connected to the chimney via 130 mm diameter sliding
rosette. It is necessary to execute the connection of the rosette and the
chimney tightly and impermeably. If the cooker is separated from the
chimney opening (not recommended) the connection is made via
standard 130 mm diameter smoke venting pipe.
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,
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 2,
mechanical appliances for flue gases suction are not allowed.

SENKO cookers C-20 and C-30 –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.
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 2
FLAT ROOF
PITCHED ROOF
Z=REFLUX ZONE

SENKO cookers C-20 and C-30 –Instruction manual 9
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 3).
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 4).
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.
figure 3
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
High (positive)
pressure zone
OVERPRESSURE
Low (negative)
pressure zone
UNDERPRESSURE
Flue
gases
from the
cooker

SENKO cookers C-20 and C-30 –Instruction manual 10
1.4. INSULATION
The cooker is insulated in the boiler area towards the external surfaces with
fire resistant rock wool, 20 mm thick. Other internal cooker parts are
insulated with chamotte brick, 25 mm thick. Chamotte brick, 60x60 mm is
used around the upper frame.
2. WARNINGS AND SAFETY
When connecting the cooker to the chimney and the central heating
system, adhere to national and European norms and local regulations.
Prior to use, verify with the local authorized chimney-sweeper whether the
cooker is properly connected to the chimney (the chimney-sweeper
must complete the installation report at the end of this Manual).
Special attention must be paid that there is enough air for combustion
being supplied to the room cooker is installed in.
Prior to commencing the firing procedure, the cooker MUST be
connected to waterworks and central heating installation. The
procedure may only be executed by an authorized expert who completes
the installation report at the end of this Manual.
Descending
wind
wind
A
B
C
D
figure 4
A-B zones in overpressure
C-D zones in underpressure

SENKO cookers C-20 and C-30 –Instruction manual 11
3. TECHNICAL FEATURES
SENKO cookers C-20 and C-30 are very adjustable for instalment in
small rooms or small objects, holiday houses and all other rooms where
there’s no need for baking yet there should be a cooking possibility. They
are made of stainless steel boiler plates and castings of quality grey
casts. The boiler is made of 5 mm thick boiler plate. The cooking plate (1)
is made of 8 mm thick fireproof plate. Cooker interior is lined with chamotte
and chamotte plates.
The ash box (14) is on the frontal side, at the bottom, just below the
secondary air regulator (11) and boiler thermometer (6) which controls the
boiler water temperature. Connections for the central heating system are on
the rear side of the cooker.
Cooker firebox (8) can function as both summer and winter firebox,
depending on the position of the firebox lower grate.
The following figures display the schematics of the cookers and their
accompanying parts.
figure 5
SUMMER FIREBOX
cooking and sanitary
water heating
WINTER FIREBOX
cooking, sanitary water heating
and radiators heating

SENKO cookers C-20 and C-30 –Instruction manual 12
17. Flue gas deflector
18. R1’’ cold water connection point
19. R1/2’’ inlet water connection
point of the boiler thermal
protection
20. R3/4’’ two-way safety valve
connection point of the boiler
thermal protection (see page
21), i.e. boiler thermal
protection safety valve probe
(see pgs. 22, 23 and 24)
21. R1/2’’ outlet water connection
point of the boiler thermal
protection
SCHEMATIC DISPLAY FOR E2320 C-20 COOKER
figure 6
THE KEY :
1. Cooking plate
2. Frame
3. Cooker base
4. Cooker housing
5. Lower door
6. Boiler thermometer
7. Boiler with base
8. Firebox door
10. Cleaning hatch lid
11. Secondary air regulator
12. Primary air automatic
regulator
14. Ash box
16. Chimney connection point
22. R1’’ warm water connection
point
23. Chimney connection point
extension
24. Firing regime adjustment
spanner
25. Cooker cleaning tool
26. CF agent for removal of soot
and grease from glass
surfaces
27. Door hinge bolt
28. Firebox door glass
30. Primary air inlet hatch
31. Decorative plate
RIGHT COOKER
E2320D C-20
- rear end view
LEFT COOKER
E2320L C-20
- rear end view

SENKO cookers C-20 and C-30 –Instruction manual 13
17. Flue gas deflector
18. R1’’ cold water connection point
19. R1/2’’ inlet water connection
point of the boiler thermal
protection
20. R3/4’’ two-way safety valve
connection point of the boiler
thermal protection (see page
21), i.e. boiler thermal
protection safety valve probe
(see pgs. 22, 23 and 24)
21. R1/2’’ outlet water connection
point of the boiler thermal
protection
SCHEMATIC DISPLAY FOR E2330 C-30 COOKER
figure 7
RIGHT COOKER
E2330D C-30
- rear end view
LEFT COOKER
E2330L C-30
- rear end view
THE KEY :
1. Cooking plate
2. Frame
3. Cooker base
4. Cooker housing
5. Lower door
6. Boiler thermometer
7. Boiler with base
8. Firebox door
10. Cleaning hatch lid
11. Secondary air regulator
12. Primary air automatic
regulator
14. Ash box
16. Chimney connection point
22. R1’’ warm water connection
point
23. Chimney connection point
extension
25. Cooker cleaning tool
26. CF agent for removal of soot
and grease from glass
surfaces
27. Door hinge bolt
28. Firebox door glass
30. Primary air inlet hatch
31. Decorative plate

SENKO cookers C-20 and C-30 –Instruction manual 14
4. INSTALLATION
Once you have removed packaging from the cooker, it is necessary to
make a detailed inspection in order to determine any potential
damages that might have occurred during transport. Nay detected
damages must instantly be reported to the manufacturer.
In places of any connection points on the cooker (water, thermal
protection, chimney, air inlet), inspection hatches must be installed for
system maintenance and servicing purposes.
4.1. POSITIONING
A spirit level must be used to place the cooker in a horizontal
position with no incline. It is necessary to ensure the minimum distance
of the cooker from any flammable objects; such as wood, chipboard,
cork and similar. If the materials are easily combustible such as PVC,
polyurethane and similar, the necessary safety distances need to be
doubled.
The minimum distance from any flammable surfaces above and in
front of the cooker is 800 mm, and 200 mm in all other directions.
When mounting the cooker on the floor made from easily combustible
material (wooden floors), the cooker must be mounted on an insulating
noncombustible surface, 60 mm thick. The surface must cover the layout
area of 800 mm in front of the cooker and 400 mm in all other directions.
It is explicitly RECOMMENDED by the manufacturer to place the
cooker as close as possible to the chimney hole, i.e. next to the
chimney hole itself in order to avoid using an additional smoke uptake
pipe. If the additional smoke uptake pipe is not used, maximum
efficiency of the cooker, i.e. fuel is additionally assured!

SENKO cookers C-20 and C-30 –Instruction manual 15
4.2. CHIMNEY PREPARATION AND CONTROL
Prior to cooker 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 8b).
Flue draught must be within parameters :
for C-20 12 ± 2 Pa,
for C-30 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 8d).
Chimney diameter is chosen according to information provided by the
chimney manufacturer –e.g., for flue draught of 15 Pa, the diameter is
usually 160 mm.
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 cooker 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 cooker and
the chimney is executed tightly and impermeably. Smoke outlet pipe
must have a suitable incline in cases where the cooker is removed
from the chimney opening.
Smoke outlet pipe must not penetrate into the chimney clear
opening (figure 8c).
Differences between the proper and improper connection of the cooker
to the chimney are displayed in the following figure.

SENKO cookers C-20 and C-30 –Instruction manual 16
figure 8
Differences between the proper and improper connection of the cooker to the chimney
PROPER
IMPROPER

SENKO cookers C-20 and C-30 –Instruction manual 17
Remove the external protective
lid with a screwdriver
Remove the sheet beneath
the lid by pressing onto the
weakest juncture
Mount the protective lid onto
the remaining chimney
opening!
Remove the internal protective
lid with a screwdriver
Remove the inner
protective lid
Remove the sheet beneath
the inner lid by pressing
onto the weakest juncture
Install the sliding rosette by using
bolts previously used to attach
the inner protective lid
figure 9
Install the external protective sheet
by using bolts previously used to
attach the external protective lid
Connect the cooker to the chimney using a sliding rosette, 130 mm in
diameter. Specially designed sliding rosette enables the adjustment of the
chimney opening in tolerance of 1,5 cm upwards, i.e. downwards.
In case it is necessary to keep the cooker removed from the chimney
opening, use the standard smoke outlet pipe, 130 mm in diameter. It is not
allowed to reduce the prescribed pipe diameters!
If the cooker is further removed from the chimney opening, it is
connected via extension tube and an elbow. The extension smoke inlet
pipe must have an appropriate incline and must not exceed 125 cm in
length. The connection of the chimney and the smoke inlet pipe must be
completely fastened!

SENKO cookers C-20 and C-30 –Instruction manual 18
4.4. FRESH AIR VENTS
The room where the cooker 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 (30)
on the rear side of the cooker for the purpose of entering fresh outside air.
4.5. CENTRAL HEATING SYSTEM CONNECTION
Prior to commencing the firing procedure, the cooker 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 cookers C-20 and C-30 –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.
Closed central heating system
Open central heating system
figure 10