Froling SP Dual 15-40 User manual

Installation Instructions
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!
M1300517_en | Edition 28/03/2017
Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Contents
1 General 4
2 Safety 5
2.1 Hazard levels of warnings 5
2.2 Qualification of assembly staff 6
2.3 Personal 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
Regulations and 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 Notes for using pressure maintenance systems 10
2.4.6 Return lift 11
2.4.7 Combination with storage tank 12
2.4.8 Chimney connection/chimney system 13
Draught limiter 13
Measuring port 14
Boiler data for planning the flue gas system 14
3 Technology 15
3.1 Dimensions 15
3.2 Technical specifications 16
3.2.1 SP Dual 15/22/28 16
3.2.2 SP Dual 34/40 18
4 Installation 20
4.1 Assembly overview 20
4.2 Materials supplied 21
4.3 Transport 21
4.4 Positioning 22
4.5 Temporary storage 22
4.6 Setting up in the boiler room 22
4.6.1 Removing the pellet unit from the pallet 22
4.6.2 Moving the boiler in the boiler room 24
4.6.3 Recommended clearances in the boiler room 24
4.7 Preparing the firewood boiler 25
4.8 Fitting the bracket with drive (optional) 26
4.9 Fitting the pellet unit 27
4.9.1 Removing the cladding from the pellet unit 27
4.9.2 Screwing the pellet unit to the firewood boiler 29
4.9.3 Installing the WOS lever 32
4.9.4 Fitting the shaft of the WOS drive (optional) 33
4.9.5 Fitting the flow sensor and laying the cables 35
Contents
2 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

4.9.6 Fitting the cladding to the pellet unit 38
4.10 Connecting the discharge system 40
4.11 Hydraulic connection 40
4.12 Electrical connection 41
4.13 Positioning the boiler stickers correctly 41
5 Start-up 42
5.1 Before commissioning / configuring the boiler 42
5.2 Initial startup 43
5.2.1 Permitted fuels 43
Wood pellets 43
Firewood 43
5.2.2 Fuels permitted under certain conditions 44
Wood briquettes 44
5.2.3 Non-permitted fuels 45
5.2.4 Heating up for the first time 45
6 Decommissioning 46
6.1 Mothballing 46
6.2 Disassembly 46
6.3 Disposal 46
7 Appendix 47
7.1 Addresses 47
7.1.1 Address of manufacturer 47
7.1.2 Address of the installer 47
Contents
Installation Instructions SP Dual 15-40 | M1300517_en 3

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
guidelines.
Please read and observe the documentation provided and always keep it close to the
system for reference. Observing the requirements and safety information in the
documentation makes a significant contribution to safe, appropriate, environmentally
friendly and economical operation of the system.
The constant further development of our products means that there may be minor
differences 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
certificate
1General
4 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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 | M1300517_en 5

2.2 Qualification of assembly staff
CAUTION
Assembly and installation by unqualified persons:
Risk of personal injury and damage to property
During assembly and installation:
❒ Observe the instructions and information in the manuals
❒ Only allow appropriately qualified personnel to work on the system
Assembly, installation, initial startup and servicing must always 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
documentation.
2.3 Personal protective equipment for assembly staff
You must ensure that staff have the protective equipment specified by accident
prevention regulations.
▪ For transportation, setup and assembly:
- suitable work wear
- protective gloves
- sturdy shoes (min. protection class S1P)
2Safety
Qualification of assembly staff
6 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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. Unless contrary to other national regulations, the latest versions
of the following standards and guidelines apply:
General standards for heating systems
EN 303-5 Boilers for solid fuels, manually and automatically fed
combustion systems, nominal heat output up to 500 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 H 5151 Planning of central hot water heating systems with or without hot
water preparation
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
protection
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 Prevention of damage hot water heating systems (Germany)
SWKI BT 102-01 Water quality for heating, steam, cooling and air conditioning
systems (Switzerland)
UNI 8065 Technical standard regulating hot water preparation.
DM 26.06.2015 (Ministerial Decree specifying the minimum
requirements)
Follow the instructions of this standard and any related updates.
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300517_en 7

Regulations and standards for permitted fuels
1. BImSchV First Order of the German Federal Government for the
implementation of the Federal Law on Emission Protection
(Ordinance on Small and Medium Combustion Plants) in the
version published on 26 January 2010,
BGBl. JG 2010 Part I No. 4.
EN ISO 17225-2 Solid bio-fuel - Fuel specifications and classes
Part 2: Wood pellets for use in industrial and domestic systems
EN ISO 17225-3 Solid bio-fuel - Fuel specifications and classes
Part 3: Wood briquettes for non-industrial use
EN ISO 17225-5 Solid bio-fuel - Fuel specifications and classes
Part 5: Firewood for non-industrial use
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:
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: report to the construction authorities of the community or magistrate
Germany: report new installations to an approved chimney sweep / the building
authorities.
2.4.3 General information for installation room (boiler room)
Boiler room characteristics
▪ The floor must be even, clean and dry and have an adequate load-bearing
capacity.
▪ 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 ensure sufficient
lighting in the boiler room in accordance with national workplace design
regulations.
▪ When using the boiler above 2000 metres above sea level you should consult the
manufacturer.
Note on standards
2Safety
Design Information
8 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

▪ Danger of fire due to flammable materials.
The floor of the boiler room must not be flammable. 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 and hydrogen
halides in the room where the boiler is installed (e.g. chlorination units for
swimming pools).
▪ Keep the air suction opening of the boiler free of dust.
▪ The system must be protected against the chewing or nesting of animals (e.g.
rodents etc.).
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
(foliage, 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
Unless contrary to other national regulations, the latest versions of the following
standards and guidelines apply:
Austria:
Germany:
ÖNORM H 5195
VDI 2035
Switzerland:
Italy:
SWKI BT 102-01
UNI 8065
Observe the standards and also follow the recommendations below:
❒Aim for a pH value of between 8.2 and 10.0. If the central heating water comes
into contact with aluminium, the pH value must be between 8.0 and 8.5
❒ Use prepared water which complies with the standards cited above for filling and
makeup water
❒ Avoid leaks and use a closed heating system to maintain water quality during
operation
❒ When filling with make-up water, always bleed the filling hose before connecting,
in order to prevent air from entering the system
Advantages of prepared water:
▪ Complies with the applicable standards
▪ Less of a drop in output due to reduced limescale build-up
▪ Less corrosion due to fewer aggressive substances
▪ Long-term cost savings thanks to improved energy efficiency
Note on standards
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300517_en 9

Limit values for filling and make-up water:
Austria Germany Switzerland
Total hardness ≤ 1.0 mmol/L ≤ 2.0 mmol/L < 0.1 mmol/L
Conductivity - < 100µS/cm < 100 µS/cm
pH value 6.0 – 8.5 6.5 – 8.5 6.0 – 8.5
Chloride < 30 mg/L < 30 mg/L < 30 mg/L
Additional requirements for Switzerland:
The filling and make-up water must be demineralised (fully purified)
▪ The water must not contain any ingredients that could settle and accumulate in the
system
▪ This makes the water non-electroconductive, which prevents corrosion
▪ It also removes all the neutral salts such as chloride, sulphate and nitrate which can
weaken corrosive materials in certain conditions
If some of the system water is lost, e.g. during repairs, the make-up water must also be
demineralised. It is not enough to soften the water. The heating system must be
professionally cleaned and rinsed before filling the units.
Inspection:
▪ After eight weeks, the pH value of the water must be between 8.2 and 10.0. If the central
heating water comes into contact with aluminium, the pH value must be between 8.0 and
8.5
▪ Yearly. Values must be recorded by the owner
2.4.5 Notes for using pressure maintenance systems
Pressure maintenance systems in hot-water heating systems keep the required
pressure within predefined limits and balance out volume variations caused by
changes in the hot-water temperature. Two main systems are used:
Compressor-controlled pressure maintenance
In compressor-controlled pressure maintenance units, a variable air cushion in the
expansion tank is responsible for volume compensation and pressure maintenance. If
the pressure is too low, the compressor pumps air into the tank. If the pressure is too
high, air is released by means of a solenoid valve. The systems are built solely with
closed-diaphragm expansion tanks to prevent the damaging introduction of oxygen
into the heating water.
Pump-controlled pressure maintenance
A pump-controlled pressure maintenance unit essentially consists of a pressure-
maintenance pump, relief valve and an unpressurised receiving tank. The valve
releases hot water into the receiving tank if the pressure is too high. If the pressure
drops below a preset value, the pump draws water from the receiving tank and feeds it
back into the heating system. Pump-controlled pressure maintenance systems with
2Safety
Design Information
10 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

open expansion tanks (e.g. without a diaphragm) introduce ambient oxygen via the
surface of the water, exposing the connected system components to the risk of
corrosion. These systems offer no oxygen removal for the purposes of corrosion
control as required by VDI 2035 and in the interests of corrosion protection should not
be used.
2.4.6 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
return temperature control.
Condensation water forms an aggressive condensate when combined with
combustion 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).
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300517_en 11

2.4.7 Combination with storage tank
Observe the regional regulations for using a storage tank!
Certain subsidy guidelines prescribe compulsory requirements for the installation of
storage tanks. Up-to-date information about individual subsidy guidelines can be found
at www.froeling.com.
Channelling the heat generated by the Dual fuel boiler to a storage tank can bring
major advantages, including:
❒better utilisation of fuel
❒ more user-friendly operation in terms of reloading intervals
❒ maximum independence from instantaneous heating requirements
❒ minimal dirt in boiler and flue gas system
As the boiler’s minimum continuous heat output is 30% above the nominal heat
output, we as boiler manufacturer are obliged under EN 303-5:2012, Section 4.4.6 to
advise that the Dual fuel boiler SP Dual must always be connected to a storage tank
with adequate storage capacity.
Certain countries have recommended storage capacities; these are listed below. The
specified values apply when the nominal heat output of the boiler corresponds to the
heating requirements of the building and a maximum of 50% of the nominal heat
output can be dissipated to the building being heated under partial load conditions.
The storage tank capacity can be calculated according to EN 303-5:2012 using the
following formula:
VSp= 15TBx QN(1 - 0.3 x QH/Qmin)
VSp
QN
TB
QH
Qmin
Storage tank capacity in [l]
Nominal heat output of boiler in [kW]
Burn-off period of boiler in [h]1)
Heating load of building in [kW]
Minimum heat output of boiler in [kW] 2)
1.Sample combustion times for various fuels are provided in the technical data
2.The boiler’s minimum output is the lowest value of the output range in the technical data. If there is no minimum heat output specified, use
the nominal heat output (Qmin = QN)
According to the relevant Austrian laws governing energy technology, which are based
on Art. 15a B-VG "Agreement on protective measures for small furnaces" (2012):
No 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 agreement.
Recommended storage tank capacity:
Unit SP Dual 15-22 SP Dual 28-40
Recommended storage tank capacity1) [l] 2000 1500
1.Values for calculating the capacity can be found in the technical data or the technical data with partial load inspection (if available)
General information
Austria
2Safety
Design Information
12 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

The first BImSchV (Ordinance on small and medium-sized heating plants of 26
January 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.
Recommended storage tank capacity:
Unit SP Dual 15-34 SP Dual 40
Recommended storage tank capacity1) [l] 2000 2800
1.Values for calculating the capacity can be found in the technical data or the technical data with partial load inspection (if available)
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.
2.4.8 Chimney connection/chimney system
EN 303-5 specifies that the entire flue gas system must be designed to prevent,
wherever possible, damage caused by seepage, insufficient feed pressure and
condensation. 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
calculated 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
We generally recommend the installation of a draught limiter. A draught limiter must
be installed if the maximum permissible feed pressure as given in the boiler data for
planning the flue gas system is exceeded.
NOTICE! Install the draught limiter directly under the mouth of the flue line, as the
pressure is constantly low at this point.
Germany
Safety 2
Design Information
Installation Instructions SP Dual 15-40 | M1300517_en 13

Measuring port
For measuring the emissions of the system, a suitable measuring port must be
installed in the connecting piece between the boiler and chimney system.
D
D
M
2 x D
In front of the measuring port (M) a straight inlet section should be located at a
distance corresponding to about twice the diameter (D) of the connecting piece. A
straight outlet section at a distance corresponding to about the single diameter of the
connecting piece should be provided after the measuring port. The measuring port
must remain closed whenever the system is in operation.
Ensure that the outside diameter of the sampling probes in the measuring port can
accommodate up to 13 mm. To avoid the ingress of false air, the diameter of the
measuring port must not exceed 21 mm.
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 - 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 - 0.007 0.010 0.012 0.015
Required feed pressure at nominal
load
Pa 8 8 8 8 8
mbar 0.08 0.08 0.08 0.08 0.08
Required feed pressure at partial load Pa - 8 8 8 8
mbar - 0.08 0.08 0.08 0.08
Maximum permissible feed pressure Pa 30 30 30 30 30
mbar 0.3 0.3 0.3 0.3 0.3
Flue pipe diameter mm 149 149 149 149 149
2Safety
Design Information
14 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

3 Technology
3.1 Dimensions
Dimension Name Unit SP Dual 15-28 SP Dual 34-40
LLength, firewood boiler mm 1125 1215
L1 Length, pellet unit 1285 1370
WSP 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
HHeight, 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 149 149
Technology 3
Dimensions
Installation Instructions SP Dual 15-40 | M1300517_en 15

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
assembly 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
Weight of pellet unit kg 305 310 315
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 ISO 17225 Part 2: Wood pellets class A1 / D06
Airborne sound level dB(A) < 70
Regulation (EU) 2015/1187
Energy efficiency A+ A+ A+
Rated heat output kW 16 22 25
Energy efficiency index of the boiler model 116 117 117
Seasonal space heating energy
efficiency
% 79 79 79
Energy efficiency index of the boiler in package
with temperature control
118 119 119
Energy efficiency class of the boiler in package
with temperature control
A+ A+ A+
3Technology
Technical specifications
16 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

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 the same constructional characteristics it is sufficient, if the ratio of
nominal heat output from the largest to the smallest boiler is ≤ 2:1, to perform 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 %
Test report data for
pellet unit
Technology 3
Technical specifications
Installation Instructions SP Dual 15-40 | M1300517_en 17

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
assembly instructions.
Technical specifications of the pellet unit
Name Pellet unit - SP Dual
321) 34 40
Rated heat output kW 32 34 38
Output range kW 9,2 - 32 9.2 - 34 9.2 – 38
Electrical connection 230V / 50Hz / C16A
Power consumption in pellet mode W 40 - 72 41 - 73 41 - 73
Boiler weight
incl. pellet unit
kg 725 735 745
Total boiler capacity (water) L 220 220 220
Water pressure drop
(ΔT = 10 / 20 K)
mbar 37,0 / 8,2 37.0 / 8.2 37.02) / 15
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 ISO 17225 Part 2: Wood pellets class A1 / D06
Airborne sound level dB(A) < 70
1.SP Dual 32 only available in Italy
2.Water pressure drop at ΔT = 12K
Regulation (EU) 2015/1187
Energy efficiency A+ A+ A+
Rated heat output kW 32 34 38
Energy efficiency index of the boiler model 119 120 120
Seasonal space heating energy
efficiency
% 81 82 82
Energy efficiency index of the boiler in package
with temperature control
121 122 122
Energy efficiency class of the boiler in package
with temperature control
A+ A+ A+
3Technology
Technical specifications
18 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com

Name Pellet unit - SP Dual
321) 34 40
Testing institute TÜV Austria2)
Test report no. 13-U-356/SD 11-UW/Wels-
EX-300/3
11-UW/Wels-
EX-300/4
1.SP Dual 32 only available in Italy
2.TÜV Austria Services GmbH, Geschäftsbereich Umweltschutz, Am Thalbach 15, A-4600 Thalheim/Wels
Test data in pellet mode - Emissions in [mg/MJ] (nominal load / partial load)
Carbon monoxide (CO) mg/MJ 7 / 18 8 / 13 8 / 13
Nitrogen oxide (NOx) mg/MJ 86 / 66 89 / 69 89 / 69
Organic hydrocarbons (OGC) mg/MJ <2 / <2 <2 / <2 <2 / <2
Dust mg/MJ 12 / 9 12 / 7 12 / 7
Boiler efficiency % 94.1 / 92.4 94.3 / 92.9 94.3 / 92.9
Test data in pellet mode - emissions in [mg/m³]1) (nominal load/partial load)
Carbon monoxide (CO) mg/m³ 11 / 27 12 / 19 12 / 19
Nitrogen oxide (NOx) mg/m³ 126 / 98 130 / 102 130 / 102
Organic hydrocarbons (OGC) mg/m³ <2 / <3 <2 / <3 <2 / <3
Dust mg/m³ 18 / 12 18 / 10 18 / 10
Boiler efficiency % 94.1 / 92.4 94.3 / 92.9 94.3 / 92.9
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 %
Test report data for
pellet unit
Technology 3
Technical specifications
Installation Instructions SP Dual 15-40 | M1300517_en 19

4 Installation
4.1 Assembly overview
1
2
3
4
5
7
6
10
11
12
89
13
Item Quantity [units] Description
1 1 Insulated door, complete
2 1 Hinge pin
3 1 Insulating cover, complete
4 1 Controller cover, complete
5 1 Cover plate
6 1 Insulating back panel cover
7 1 Insulating back panel
8 1 Brass bushing
9 1 Counter nut
10 1 Heat insulation mat
11 6 Tension spring
12 1 Insulation side panel
13 1 Floor insulation
4Installation
Assembly overview
20 Froling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.com