Froling SP Dual 15 User manual

Installation Instructions
D
Dual fuel boiler SP Dual 15-40
Translation of the original German operating instructions for technicians
Read and follow the instructions and safety information!
Technical changes, typographical errors and omissions reserved!
M1300212_en | Edition 24/09/2012
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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Contents
1 General 4
2 Safety 5
2.1 Hazard levels of warnings 5
2.2 Qualification of assembly staff 6
2.3 Protective equipment for assembly staff 6
2.4 Design Information 7
2.4.1 Notes on Standards 7
General standards for heating systems 7
Standards for structural and safety devices 7
Standards for heating water 7
Standards for permitted fuels 8
2.4.2 Installation and approval of the heating system 8
2.4.3 General information for installation room (boiler room) 8
2.4.4 Requirements for central heating water 9
2.4.5 Return lift 9
2.4.6 Combination with storage tank 10
2.4.7 Chimney connection/chimney system 11
Draught limiter 11
Boiler data for planning the flue gas system 11
3 Technology 12
3.1 Dimensions 12
3.2 Technical specifications 13
3.2.1 SP Dual 15/22/28 13
3.2.2 SP Dual 34/40 15
4 Installation 17
4.1 Transport 17
4.2 Positioning 17
4.3 Temporary storage 17
4.4 Setting up in the boiler room 17
4.4.1 Removing the pellet unit from the pallet 17
4.4.2 Moving the boiler in the boiler room 19
4.4.3 Minimum distances in the boiler room 19
4.5 Preparing the firewood boiler 20
4.6 Fitting the pellet unit 21
4.6.1 Removing the cladding from the pellet unit 21
4.6.2 Screwing the pellet unit to the firewood boiler 22
4.6.3 Installing the WOS lever 24
4.6.4 Fitting the flow sensor and laying the cables 26
4.7 Connecting the discharge system 28
4.8 Hydraulic connection 28
4.9 Electrical connection 29
4.10 Positioning the boiler stickers correctly 29
Contents
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5Start-up 30
5.1 Before commissioning / configuring the boiler 30
5.1.1 Setting the "Max level and Min level” sensor 31
5.2 Initial startup 31
5.2.1 Permitted fuels 31
Wood pellets 31
Firewood 31
5.2.2 Heating up for the first time 32
6 Decommissioning 33
6.1 Mothballing 33
6.2 Disassembly 33
6.3 Disposal 33
7 Appendix 34
7.1 Addresses 34
7.1.1 Address of manufacturer 34
7.1.2 Address of the installer 34
Contents
Installation Instructions SP Dual 15-40 | M1300212_en 3

1
1 General
Thank you for choosing a quality product from Froling. The product features a state-of-
the-art design and conforms to all currently applicable standards and testing guide‐
lines.
Please read and observe the documentation provided and always keep it close to the
system for reference. It contains important safety information and all the operation and
maintenance specifications needed to operate the system safely, properly, environ‐
mentally friendly and cost-effectively.
The constant further development of our products means that there may be minor dif‐
ferences from the pictures and content. If you discover any errors, please let us know:
[email protected]
Subject to technical change.
The EC Declaration of Conformity is only valid in conjunction with a delivery certificate,
which has been filled in correctly and signed as part of the commissioning process.
The original document remains at the installation site. Commissioning installers or
heating engineers are requested to return a copy of the delivery certificate together
with the guarantee card to Froling. On commissioning by FROLING Customer Service
the validity of the delivery certificate will be noted on the customer service record.
Issuing a delivery cer‐
tificate
1General
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2 Safety
2.1 Hazard levels of warnings
This documentation uses warnings with the following hazard levels to indicate direct
hazards and important safety instructions:
DANGER
The dangerous situation is imminent and if measures are not observed it will lead
to serious injury or death. You must follow the instructions!
WARNING
The dangerous situation may occur and if measures are not observed it will lead
to serious injury or death. Work with extreme care.
CAUTION
The dangerous situation may occur and if measures are not observed it will lead
to minor injuries or damage to property.
Safety 2
Hazard levels of warnings
Installation Instructions SP Dual 15-40 | M1300212_en 5

2
2.2 Qualification of assembly staff
CAUTION
Assembly and installation by untrained personnel:
Risk of personal injury and damage to property.
During assembly and installation:
❒ Observe the instructions and information in the manuals
❒ Only allow trained staff to carry out assembly and installation
Assembly, installation, initial startup and servicing must only be carried out by qualified
personnel:
- Heating technician / building technician
- Electrical installation technician
- Froling customer services
The assembly staff must have read and understood the instructions in the documenta‐
tion.
2.3 Protective equipment for assembly staff
You must ensure that staff have the protective equipment specified by accident pre‐
vention regulations.
▪ For transportation, setup and assembly:
- suitable workwear
- protective gloves
- sturdy shoes
2Safety
Qualification of assembly staff
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2.4 Design Information
2.4.1 Notes on Standards
The system must be installed and commissioned in accordance with the local fire and
building regulations. The following standards and regulations should always be ob‐
served:
General standards for heating systems
EN 303-5 Boilers for solid fuels, manually and automatically fed combus‐
tion systems, nominal output up to 300 kW
EN 12828 Heating systems in buildings - Design of water-based heating
systems
EN 13384-1 Chimneys - Thermal and fluid dynamic calculation methods
Part 1: Chimneys serving one appliance
ÖNORM M 7510-1 Guidelines for checking central heating systems
Part 1: General requirements and one-off inspections
ÖNORM M 7510-4 Guidelines for checking central heating systems
Part 4: Simple check for heating plants for solid fuels
Standards for structural and safety devices
ÖNORM H 5170 Heating installation - Requirements for construction and safety
engineering, as well as fire prevention and environmental pro‐
tection
ÖNORM M 7137 Compressed untreated wood – Requirements for storing pellets
at the end customer’s site
TRVB H 118 Technical directives for fire protection/prevention (Austria)
Standards for heating water
ÖNORM H 5195-1 Prevention of damage by corrosion and scale formation in
closed warm water heating systems at operating temperatures
up to 100 °C (Austria).
VDI 2035 Sheet 1 Prevention of damage in water heating systems - Scale forma‐
tion in domestic water heating systems and hot water heating
systems (Germany)
SWKI 97-1 Water quality for heating, steam, cooling and air conditioning
systems (Switzerland)
D.P.R. no. 412 Regulations for the planning, installation, running/operation and
maintenance of heating systems in buildings to reduce energy
consumption with reference to Article 4, Comma 4 of the Legis‐
lative Decree of 9 January 1991, No. 10 (Italy)
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300212_en 7

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Standards for permitted fuels
EN 14961-2 Solid biofuel, fuel specifications and classes.
Part 2: Wood pellets for non-industrial use
EN 14961-3 Solid biofuel, fuel specifications and classes.
Part 2: Wood briquettes for non-industrial use
EN 14961-5 Solid biofuel, fuel specifications and classes.
Part 5: Firewood for non-industrial use
1. BImSchV First Ordinance of the German Federal Government for imple‐
mentation of the Federal Emission Protection Law, BGBl. I P.
491, in the applicable version.
2.4.2 Installation and approval of the heating system
The boiler should be operated in a closed heating system. The following standards
govern the installation:
ÖNORM / DIN EN 12828 Heating Systems in Buildings
NOTICE! Each heating system must be officially approved.
The appropriate supervisory authority (inspection agency) must always be informed
when installing or modifying a heating system, and authorisation must be obtained
from the building authorities:
Austria:
Inform the civic/municipal building authorities.
Germany:
Notify an approved chimney sweep and the building authorities.
2.4.3 General information for installation room (boiler room)
Boiler room characteristics
▪ There must not be a potentially explosive atmosphere in the boiler room as the
boiler is not suitable for use in potentially explosive environments.
▪ The boiler room must be frost-free.
▪ The boiler does not provide any light, so the customer must provide sufficient light‐
ing in the boiler room in accordance with national workplace design regulations.
▪ When using the boiler over 2000 metres above sea level you should consult the
manufacturer.
▪ Danger of fire due to flammable materials.
No flammable materials should be stored near the boiler. Flammable objects (e.g.
clothing) must not be put on the boiler to dry.
▪ Damage due to impurities in combustion air.
Do not use any solvents or cleaning agents containing chlorine in the room where
the boiler is installed.
▪ Keep the air suction opening of the boiler free from dust.
Note on standards
2Safety
Design Information
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Ventilation of the boiler room
Ventilation air for the boiler room should be taken from and expelled directly outside,
and the openings and air ducts should be designed to prevent weather conditions (foli‐
age, snowdrifts, etc.) from obstructing the air flow.
Unless otherwise specified in the applicable building regulations for the boiler room,
the following standards apply to the design and dimensions of the air ducts:
ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention
2.4.4 Requirements for central heating water
The following standards and guidelines apply:
Austria:
Germany:
Switzerland:
Italy:
ÖNORM H 5195-1
VDI 2035
SWKI 97-1
D.P.R. no. 412
NOTICE! Note on filling with make-up water: Always bleed the filling hose before con‐
necting, in order to prevent air from entering the system.
2.4.5 Return lift
If the hot water return is below the minimum return temperature, some of the hot water
outfeed will be mixed in.
CAUTION
Risk of dropping below dew point/condensation formation if operated without re‐
turn temperature control.
Condensation water forms an aggressive condensate when combined with com‐
bustion residue, leading to damage to the boiler.
Take the following precautions:
❒ Regulations stipulate the use of a return temperature control.
➥
The minimum return temperature is 60 °C. We recommend fitting some
sort of control device (e.g. thermometer).
Note on standards
Note on standards
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300212_en 9

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2.4.6 Combination with storage tank
Always observe and abide by regionally binding regulations when using a storage
tank. Certain subsidy guidelines also prescribe compulsory requirements for the instal‐
lation of buffer storage tanks. Up-to-date information relating to specific subsidy guide‐
lines for your region can be found on our website www.froeling.com.
Combining the system with a buffer storage tank offers significant advantages when
using a firewood boiler, such as better utilisation of the fuel, more user-friendly opera‐
tion in terms of reloading intervals (which means the greatest possible independence
from instantaneous heating requirements), and less soiling of the boiler and flue gas
system. In addition to the above, as the manufacturer of the boiler we have to advise
on how the heat generated can be dissipated. This is because compliance with the
emissions limits and minimum levels of efficiency at a minimum heat output of max.
30% of the rated heat output, as specified in Section 4.2.5 of EN 303-5, has not been
demonstrated for all variants of the system.
The recommended storage volume for each boiler is given in the technical specifica‐
tions. The specified value applies under the following conditions: the rated heat output
of the boiler corresponds to the heating requirements of the building and a maximum
of 50% of the rated heat output can be dissipated to the building being heated under
partial load conditions.
Calculating the storage tank volume as per EN 303-5:
V
Sp
= 15T
B
x Q
N
(1 - 0.3 x Q
H
/Q
min
)
VSp
QN
TB
QH
Qmin
Storage tank capacity in [l]
Nominal output of the boiler in [kW]
Combustion period of the boiler in [h]
Heating load of building in [kW]
Minimum output of boiler in [kW] 1)
1.The boiler’s minimum output is the lowest value of the output range in the technical data. If there is no minimum output specified, use the
nominal output (Qmin = QN)
In accordance with the relevant Austrian laws governing energy technology, which are
based on Art. 15a B-VG "Agreement on protective measures for small furnaces" dated
November 1994, no buffer storage tank is required on manually fed biomass boilers
that have been positively tested at both nominal load and partial load (below 50% of
nominal load) to ensure they adhere to the emissions limits specified in that agree‐
ment.
The first BImSchV (Ordinance on small and medium-sized heating plants of 26 Janu‐
ary 2010, BGBl. I P. 38) stipulates a minimum water heat storage tank volume of 55
litres per kilowatt of rated heat output; a water heat storage tank with a volume of 12
litres per litre of fuel loading chamber is recommended.
For the correct dimensions of the storage tank and the line insulation
(e.g. in accordance with ÖNORM M 7510 or guideline UZ37) please consult your installer or
Froling.
General information
Austria
Germany
2Safety
Design Information
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2.4.7 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent, wher‐
ever possible, damage caused by seepage, insufficient feed pressure and condensa‐
tion. Please note in this respect that flue gas temperatures lower than 160K above
room temperature can occur in the permitted operating range of the boiler.
The flue gas temperatures (for clean systems) and additional flue gas values can be
found in the table below.
The connection between the boiler and the chimney system should be as short as
possible. The upward angle of the connection should not exceed 30 - 45°. Insulate the
connection. The entire flue gas system - chimney and connection - should be calcula‐
ted in accordance with EN 13384-1.
Local regulations and other statutory regulations also apply.
NOTICE! The chimney must be authorised by a smoke trap sweeper or chimney
sweep.
NOTICE! TRVB H 118 (Austria only) stipulates that an explosion flap must be installed
in the connecting piece (flue pipe) directly next to the boiler. It should be situated in
such a way that is poses no risk to persons!
Draught limiter
The installation of a draught limiter is recommended.
NOTICE! Install the draught limiter directly under the mouth of the flue line, as the
pressure is constantly low at this point.
Boiler data for planning the flue gas system
The chimney design data is the same as the values of the S4 Turbo firewood boiler.
Name SP Dual
15 22 28 34 40
Flue gas temperature at nominal load °C 140 160 180 140 170
Flue gas temperature at partial load 100 110 130 110 130
Flue gas mass flow at nominal load kg/s 0.011 0.016 0.021 0.025 0.030
Flue gas mass flow at partial load 0.004 0.007 0.010 0.012 0.015
Minimum feed pressure mbar 0.08 0.08 0.08 0.08 0.08
Maximum permissible feed pressure as per ÖNORM/DIN EN 303-5
Flue pipe diameter mm 150 150 150 150 150
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300212_en 11

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3 Technology
3.1 Dimensions
Dimension Name Unit SP Dual 15-28 SP Dual 34-40
L
Length, firewood boiler mm 1125 1215
L1
Length, pellet unit 1285 1370
W
SP Dual width mm 1000 1100
W1
Total width, SP Dual incl. heat exchanger lever 1050 1150
W2
Width, firewood boiler 570 670
W3
Width, pellet unit 430 430
H
Height, boiler mm 1565 1565
H1
Total height incl. flue gas nozzle 1610 1610
H2
Height, flue pipe connection 1830 1830
H3
Height, flow – firewood boiler connection 1360 1360
H4
Height, return – firewood boiler connection 140 140
H5
Height, safety heat exchanger connection 970 970
H6
Height, drainage connection 120 120
H7
Height, flow and return - pellet unit connection 140 160
H8
Height, suction system connection 1370 1360
H9
Height, pellet unit 1465 1465
H10
Total height, pellet unit incl. suction turbine 1545 1545
H11
Total space with cover open 1865 1865
Flue pipe diameter mm 150 150
3Technology
Dimensions
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3.2 Technical specifications
3.2.1 SP Dual 15/22/28
Technical specifications of the firewood boiler
The technical specifications of the firewood boiler can be found in the relevant assem‐
bly instructions.
Technical specifications of the pellet unit
Name Pellet unit - SP Dual
15 22 28
Rated heat output kW 15.6 22 25
Output range kW 4.7 - 15.6 4.7 – 22 4.7 – 25
Electrical connection 230V / 50Hz / C16A
Power consumption in pellet mode W 38 - 60 38 - 67 38 - 70
Boiler weight
incl. pellet unit
kg 945 955 965
Total boiler capacity (water) L 157 157 157
Water pressure drop
(ΔT = 10 / 20 K)
mbar 7.5 / 1.5 14.5 / 7.5 18.5 / 5.9
Min. boiler return temperature °C 60
Max. permitted operating temperature °C 90
Permitted operating pressure bar 3
Boiler class as per EN 303-5:1999
(pr EN 303-5:2012)
3 (5)
Permitted fuel as per EN 14961 Part 2: Wood pellets class A1 / D06
Airborne sound level dB(A) < 70
Technology 3
Technical specifications
Installation Instructions SP Dual 15-40 | M1300212_en 13

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Test report data for pellet unit
Name Pellet unit - SP Dual
15 22 28
Testing institute TÜV Austria1) 2) 3) TÜV Austria1)
Test report no. 11-UW/Wels-
EX-300/1
11-UW/Wels-
EX-300/2
1.TÜV Austria Services GmbH, Geschäftsbereich Umweltschutz, Am Thalbach 15, A-4600 Thalheim/Wels
2.As per EN 303-5, Section 5.1.3 type test: for a boiler from a range with a consistent structure it is sufficient, if the ratio of rated heat output
from the largest to the smallest boiler ≤ 2 : 1, to carry out the tests with the smallest and the largest boilers. The boiler manufacturer must
ensure that all boilers, including those that have not been tested in the range, whose values have been determined depending on the rated
heat output by interpolation, fulfil the requirements of the norm.
3.Values for the type SP Dual 22 are interpolated between the SP Dual 15 and SP Dual 28 of test protocols 11-UW/Wels-EX-300/1 and 11-
UW/Wels-EX-300/2.
Test data in pellet mode - Emissions in [mg/MJ] (nominal load / partial load)
Carbon monoxide (CO) mg/MJ 5 / 37 4 / 37 4 / 37
Nitrogen oxide (NOx) mg/MJ 73 / 57 75 / 57 76 / 57
Organic hydrocarbons (OGC) mg/MJ <1 / <2 <1 / <2 <1 / <2
Dust mg/MJ 11 / 14 13 / 14 14 / 14
Boiler efficiency % 93.6 / 90.5 93.5 / 90.5 93.4 / 90.5
Test data in pellet mode - Emissions in [mg/m³]1) (Nominal load / partial load)
Carbon monoxide (CO) mg/m³ 8 / 55 7 / 55 6 / 55
Nitrogen oxide (NOx) mg/m³ 107 / 84 110 / 84 112 / 84
Organic hydrocarbons (OGC) mg/m³ <2 / <3 <2 / <3 <2 / <3
Dust mg/m³ 16 / 20 19 / 20 20 / 20
Boiler efficiency % 93.6 / 90.5 93.5 / 90.5 93.4 / 90.5
1.Emissions values based on dry flue gas at standard temperature and pressure (0°C, 1013 mbar) with a volume content of oxygen of 13%
3Technology
Technical specifications
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3.2.2 SP Dual 34/40
Technical specifications of the firewood boiler
The technical specifications of the firewood boiler can be found in the relevant assem‐
bly instructions.
Technical specifications of the pellet unit
Name Pellet unit - SP Dual
34 40
Rated heat output kW 34 38
Output range kW 9.3 - 34 9.3 – 38
Electrical connection 230V / 50Hz / C16A
Power consumption in pellet mode W 41 - 72 41 - 73
Boiler weight
incl. pellet unit
kg 1055 1075
Total boiler capacity (water) L 220 220
Water pressure drop
(ΔT = 10 / 20 K)
mbar 37 / 8.2 341) / 13
Min. boiler return temperature °C 60
Max. permitted operating temperature °C 90
Permitted operating pressure bar 3
Boiler class as per EN 303-5:1999
(pr EN 303-5:2012)
3 (5)
Permitted fuel as per EN 14961 Part 2: Wood pellets class A1 / D06
Airborne sound level dB(A) < 70
1.Water pressure drop at ΔT = 12K
Technology 3
Technical specifications
Installation Instructions SP Dual 15-40 | M1300212_en 15

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Test report data for pellet unit
Name Pellet unit - SP Dual
34 40
Testing institute 2) 3) TÜV Austria1)
Test report no. 12-U-277/SD
11-UW/Wels-EX-300
1.TÜV Austria Services GmbH, Geschäftsbereich Umweltschutz, Am Thalbach 15, A-4600 Thalheim/Wels
2.As per EN 303-5, Section 5.1.3 type test: for a boiler from a range with a consistent structure it is sufficient, if the ratio of rated heat output
from the largest to the smallest boiler ≤ 2 : 1, to carry out the tests with the smallest and the largest boilers. The boiler manufacturer must
ensure that all boilers, including those that have not been tested in the range, whose values have been determined depending on the rated
heat output by interpolation, fulfil the requirements of the norm.
3.Values for the type SP Dual 34 are interpolated between the SP Dual 28 and SP Dual 40 of test protocols 11-UW/Wels-EX-300/2 and 12-
U-277/SD 11-UW/Wels-EX-300.
Test data in pellet mode - Emissions in [mg/MJ] (nominal load / partial load)
Carbon monoxide (CO) mg/MJ 7 / 13 8 / 13
Nitrogen oxide (NOx) mg/MJ 85 / 69 89 / 69
Organic hydrocarbons (OGC) mg/MJ <1 / <2 <1 / <2
Dust mg/MJ 13 / 7 12 / 7
Boiler efficiency % 93.8 / 93 94 / 93
Test data in pellet mode - Emissions in [mg/m³]1) (Nominal load / partial load)
Carbon monoxide (CO) mg/m³ 10 / 19 12 / 19
Nitrogen oxide (NOx) mg/m³ 124 / 102 130 / 102
Organic hydrocarbons (OGC) mg/m³ <2 / <3 <2 / <3
Dust mg/m³ 19 / 10 18 / 10
Boiler efficiency % 93.8 / 93 94 / 93
1.Emissions values based on dry flue gas at standard temperature and pressure (0°C, 1013 mbar) with a volume content of oxygen of 13%
3Technology
Technical specifications
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4 Installation
4.1 Transport
The product is delivered on pallet(s) in cardboard packaging.
NOTICE
Damage to components if handled incorrectly
❒ Follow the transport instructions on the packaging.
❒ Transport components with care to avoid damage
❒ Protect the packaging against damp
❒ Pay attention to the pallet's centre of gravity when lifting
4.2 Positioning
❒ Position a fork-lift or similar lifting device at the pallet and bring in the components
If the pellet unit cannot be brought in on the pallet:
❒ Remove the cardboard packaging and take the pellet unit off the pallet
⇨ See "Removing the pellet unit from the pallet" [page 17]
4.3 Temporary storage
If the system is to be assembled at a later stage:
❒ Store components at a protected location, which is dry and free from dust
➥
Damp and frost can damage components, particularly electric ones!
4.4 Setting up in the boiler room
4.4.1 Removing the pellet unit from the pallet
The component comes screwed to the pallet:
❒ Remove the transport locks
❒ Pull out floor insulation
❒ Lift unit off pallet
Installation 4
Transport
Installation Instructions SP Dual 15-40 | M1300212_en 17

To lift using a crane:
❒ Unscrew the retaining screw beside the handle and open the cover of the pellet
unit
❒ Undo the screw connection of the gas spring on the cover
❒ Unscrew the two screws on the hinge of the cover and remove the cover
❒ Remove the cover plate beside the control cover
❒ Secure the crane hook to the crane eye below and lift the pellet unit
4
4Installation
Setting up in the boiler room
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4.4.2 Moving the boiler in the boiler room
❒ Position a fork-lift or similar lifting device with a suitable load-bearing capacity at
the base frame
❒ Lift and transport to the intended position in the installation room
➥
Observe the minimum distances in the boiler room.
4.4.3 Minimum distances in the boiler room
▪ The system should generally be set up so that it is accessible from all sides allow‐
ing quick and easy maintenance.
▪ Regional regulations regarding necessary maintenance areas for inspecting the
chimney should be observed in addition to the specified minimum distances!
▪ Observe the applicable standards and regulations when setting up the system.
▪ Observe additional standards for noise protection
(ÖNORM H 5190 - Noise protection measures)
Di‐
men‐
sion
Name Unit SP Dual 15-28 SP Dual 34-40
A
Distance - insulated door to wall mm 800 800
B
Distance – boiler side with heat ex‐
changer lever and pellet unit to wall
600 700
B1
Distance – boiler side without pellet
unit to wall
1030 1130
C
Distance – back to wall 500 500
D
Distance – boiler side to wall 200 200
E
Space required for open cover 300 300
Installation 4
Setting up in the boiler room
Installation Instructions SP Dual 15-40 | M1300212_en 19

4
4.5 Preparing the firewood boiler
Before fitting the pellet unit, please assemble the S4 Turbo F in accordance with the
assembly instructions provided. If the pellet unit is being retrofitted, prepare the fire‐
wood boiler as follows:
❒ Push in the pre-cut cover of the air suction channel
❒ Remove the cover plate of the flange
❒ Remove the blind plate
❒ Screw in a lock bolt on the left and centre right
❒ Open the insulated door and combustion chamber door of the firewood boiler
❒ Remove the middle linking plate on the flange side
❒ Fit the linking plate provided to the flange cutout as shown
4Installation
Preparing the firewood boiler
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