SIST EN 15035:2007

SLOVENSKI STANDARD
SIST EN 15035:2007
01-februar-2007
Kotli za gretje – Posebne zahteve za oljne kotle z zunanjim zajemom zraka do 70
kW
Heating boilers - Special requirements for oil fired room sealed units up to 70 kW
Heizkessel - Besondere Anforderungen an ölbefeuerte Units für den
raumluftunabhängigen Betrieb bis einschließlich 70 kW
Chaudieres de chauffage central - Exigences spécifiques aux chaudieres au fioul
étanches de puissance inférieure ou égale a 70 kW
Ta slovenski standard je istoveten z: EN 15035:2006
ICS:
97.100.40 *UHOQLNLQDWHNRþHJRULYR Liquid fuel heaters
SIST EN 15035:2007 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 15035:2007

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SIST EN 15035:2007
EUROPEAN STANDARD
EN 15035
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 97.100.40

English Version
Heating boilers - Special requirements for oil fired room sealed
units up to 70 kW
Chaudières de chauffage - Système de circuit de Heizkessel - Besondere Anforderungen an ölbefeuerte
combustion étanche des chaudières au fioul Units für den raumluftunabhängigen Betrieb bis
einschließlich 70 kW
This European Standard was approved by CEN on 4 November 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15035:2006: E
worldwide for CEN national Members.

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SIST EN 15035:2007
EN 15035:2006 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .5
3 Terms and definitions .5
4 Boiler classification.6
5 Construction and materials .8
6 Operational requirements .10
7 Test methods.14
8 Marking and instructions .21
Annex A (informative) Classification of type C boilers .32
Annex B (informative) Steel grades.34
Annex ZA (informative) Relationship between this European Standard and the Essential Requirements
of EU Directive 92/42/EEC on efficiency requirements for new hot-water boilers fired with
liquid or gaseous fuels.35
Bibliography .36

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SIST EN 15035:2007
EN 15035:2006 (E)
Foreword
This document (EN 15035:2006) has been prepared by Technical Committee CEN/TC 57 “Central heating
boilers”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2007, and conflicting national standards shall be withdrawn at
the latest by June 2007.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
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SIST EN 15035:2007
EN 15035:2006 (E)

1 Scope
This European Standard applies to type C central heating boilers as specified in 4.1, equipped with
X3
atomizing oil burners:
 type C , type C and type C boilers, including their combustion air supply and combustion products
13 33, 53
evacuation ducts and their terminals;
 type C boilers including their connection ducts but without the chimney which is erected as a shared
43
duct system and which is part of the building;
 type C boilers, including the connecting piece as specified in 3.7, if not integrated into the boiler;
63
 type C boilers, including their connection ducts but without the chimney which is part of the building;
83
 that have a nominal useful heat output below or equal to 70 kW;
 where the temperature of the water does not exceed 100 °C during normal operation;
 where the maximum water-side operating pressure does not exceed 8 bar.
This European Standard is intended to establish specific requirements and test methods for type C atomizing
oil burning central heating boilers with respect to construction, safety, fitness for purpose, rational use of
energy, classification and marking.
This European Standard covers only standard tests.
For boilers that produce domestic hot water by a drum or a heat exchanger, integrated or juxtaposed, (by
accumulation of instant production), this standard only applies to hot water reheating system components that
are not subject to operating conditions applicable to the boiler heating system.
This European Standard covers units consisting of boilers equipped with burners that meet the requirements
of EN 267, with the following exceptions:
 maximum NO and CO emission values, estimated for boilers according to the classes defined in
x
EN 303-2;
 air factor value, defined by the manufacturer and stated in the boiler’s technical specifications;
 marking and/or burner data plate which may provide information for the boiler data plate;
 installation recommendations for installing the burner on the boiler included in the boiler operating
instructions.
This European Standard modifies EN 303-1, EN 303-2, EN 304 and specifies supplementary requirements
only for room sealed operations.

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SIST EN 15035:2007
EN 15035:2006 (E)
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 267, Forced draught oil burners — Definitions, requirements, testing, marking
EN 303-1, Heating boilers — Part 1: Heating boilers with forced draught burners — Terminology, general
requirements, testing and marking
EN 303-2:1998, Heating boilers — Part 2: Heating boilers with forced draught burners — Special
requirements for boilers with atomizing oil burners
EN 303-4, Heating boilers — Part 4: Heating boilers with forced draught burners — Special requirements for
boilers with forced draught oil burners with outputs up to 70 kW and a maximum operating pressure of 3 bar
— Terminology, special requirements, testing and marking
EN 304:1992, Heating boilers — Test code for heating boilers for atomizing oil burners
EN 1443, Chimneys — General requirements
EN 1457, Chimneys — Clay/Ceramic Flue Liners - Requirements and test methods
EN 1856-1, Chimneys — Requirements for metal chimneys — Part 1: System chimney products
EN 1856-2, Chimneys — Requirements for metal chimneys — Part 2: Metal liners and connecting flue pipes
EN 13063-1, Chimneys — System chimneys with clay/ceramic flue liners — Part 1: Requirements and test
methods for sootfire resistance
EN 13063-2, Chimneys — System chimneys with clay/ceramic flue liners — Part 2: Requirements and test
methods under wet conditions
EN 13216-1, Chimneys — Test methods for system chimneys — Part 1: General test methods
EN 14471, Chimneys — System chimneys with plastic flue liners — Requirements and test methods
EN 15034, Heating boilers — Condensing heating boilers for fuel oil
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
required draught
difference in pressure between the static pressure of the air in the area where the boiler is installed and the
static pressure of combustion products leaving the boiler (combustion products measuring hole), required to
ensure good working order
3.2
room-sealed boiler
boiler in which the combustion circuit is sealed off from the area where the boiler is installed
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SIST EN 15035:2007
EN 15035:2006 (E)
3.3
combustion circuit
circuit including the air supply duct, burner, combustion chamber, heat exchanger, combustion products
evacuation duct and either the connection piece or terminal connection (where applicable)
3.4
air supply and combustion products evacuation ducts
means for transporting combustion air to the burner and combustion products to the terminal or connection
piece.
It is necessary to distinguish between:
 completely surrounded ducts: combustion products evacuation duct is surrounded by combustion air
throughout its length;
 separate ducts: combustion products evacuation duct and the combustion air supply duct are neither
concentric nor completely surrounded ducts
3.5
terminal
device fitted to the outside of a building, to which are connected:
 air supply and combustion products evacuation ducts for type C and type C boilers (one device);
13 33
 air supply duct and the combustion products evacuation duct for type C boilers (two devices);
53
 air supply duct for type C boilers (no device)
83
3.6
terminal guard
device that protects the terminal from mechanical damage from outside influences
3.7
connection piece
device which allows the fitting of a sealed boiler to any system for combustion air supply and combustion
products boiler classification
4 Boiler classification
4.1 General
A type C boiler is a boiler in which the combustion circuit is sealed from the area of the building where the
boiler is installed.
The air supply and combustion products evacuation ducts and the terminal or the fitting piece which is used to
connect the boiler to a chimney or duct system may or may not be part of the unit as stated in 4.2. They admit
fresh air from outside the building to the burner as well as discharge the combustion products to the outside.
Boilers are classified into several types according to the combustion products mode of evacuation and supply
of combustion air (see examples attached in Annex A).
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SIST EN 15035:2007
EN 15035:2006 (E)
)
1
The types are defined by two subscripts:
 first subscript number is based on the possible boiler installation with respect to the mode of air supply
and evacuation of the combustion products (see 4.2);
 second subscript number is based upon the presence and position of an integral fan in the boiler (see
4.2.8).
4.2 Type of boiler installation
4.2.1 General
Types of installation given below are in line with CR 1749.
4.2.2 Type C
1
A type C boiler connected via its ducts to a horizontally installed terminal at the wall or on the roof. The orifices
of the ducts are either concentric or close enough to come under similar wind conditions.
4.2.3 Type C
3
A type C boiler which is connected via its ducts to a vertically installed terminal. The orifices of the ducts are
either concentric or close enough to come under similar wind conditions.
4.2.4 Type C
4
A type C boiler which is fitted via its ducts possibly by means of a fitting piece to a shared duct system
consisting of a duct for the supply of the combustion air and a duct for the discharge of the combustion
products. The orifices of this shared duct system are either concentric or close enough to come under similar
wind conditions.
4.2.5 Type C
5
A type C boiler which is connected via its separate ducts to two terminals that may terminate in zones of
different pressure.
4.2.6 Type C
6
A type C boiler connected to a separately approved and marketed system for the supply of combustion air and
discharge of the combustion products.
4.2.7 Type C
8
A type C boiler which is connected via its ducts by means of a fitting piece to an air supply terminal and fitted
to an individual or shared chimney.
4.2.8 Presence and position of a fan
 Type C boiler that does not incorporate a fan is identified by the second subscript number “1” (e.g. C ).
11

)
1
Boilers in which the combustion circuit is under positive pressure and surrounded by the combustion air circuit may
require identification by an additional subscript in accordance with national regulations, if they are intended to be installed
in non-ventilated areas.
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SIST EN 15035:2007
EN 15035:2006 (E)
 Type C boiler that does incorporate a fan downstream of the combustion chamber/ heat exchanger is
identified by the second subscript number “2” (e.g. C ).
12
 Type C boiler that does incorporate a fan upstream of the combustion chamber/ heat exchanger is
identified by the second subscript number “3” (e.g. C ).
13
For heating boilers equipped with atomising oil burners only C appliances exist.
X3
5 Construction and materials
5.1 General
Boilers covered by this European Standard shall meet the requirements of 5.2 to 5.6, in addition to the
materials and construction requirements in EN 303-1or EN 303-4 or for condensing boilers in prEN 15034.
5.2 Combustion products evacuation and air supply ducts
The quality of materials and the shape and size of the components (ducts, seals) shall ensure that when
appropriately assembled, in the conditions specified by the manufacturer with respect to maintenance, and
taking into account the relevant thermal, chemical and mechanical constraints, the ducts are reliable and
function satisfactorily for an acceptable length of time.
CE marked products in accordance with appropriate harmonised European specifications are presumed to
perform as stated, although this does not replace the manufacturer responsibility to ensure that the liner,
connecting flue pipe and fitting product (products according EN 13063-1 and EN 13063-2, EN 1856-1 and
EN 1856-2 and EN 14471) as a whole are correctly designed and that component products have the
necessary performance values.
The flue gas carrying parts shall be designated as P1 and W2 (V2); for appliances using kerosene, P1 and
W1 are also suitable.
5.3 Condensate discharge
5.3.1 General
For non-condensing appliances where condensation is continuously formed during normal operation, the
condensate shall drain to the boiler and 5.3.2 to 5.4.2.3 shall apply.
5.3.2 Removal of condensate
Condensation produced during boiler operation, including condensation formed in the flue and its connecting
pipes, shall be removed by a discharge pipe (or pipes).
The internal diameter of the outside connection of the condensate discharge system shall be at least 13 mm.
The disposal system, forming part of the boiler or supplied with the boiler, shall be such that:
 it can be easily inspected and cleaned in accordance with the manufacturer's instructions;
 it cannot transmit combustion products into the room where the boiler is installed; this requirement is
satisfied if the disposal system incorporates a water trap;
 water trap has a seal of at least 25 mm at maximum pressure in the combustion chamber at the
maximum flue length specified by the manufacturer.
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Surfaces in contact with condensation (except purpose provided drains, water traps and siphons) shall be
designed to prevent condensate retention.
5.4 Soundness
5.4.1 Soundness of the combustion circuit
Parts which have to be removed during routine service and affect the soundness of the boiler and/or its ducts,
shall be sealed mechanically, excluding pastes, liquids and tapes. Replacing the seals, following a cleaning or
servicing operation as stated by the manufacturer, is permitted.
The service instructions shall clearly show how to replace parts which may affect the soundness of the
combustion circuit.
If parts of the casing that forms part of the combustion circuit is removed by the user, then clear instructions
and appropriate warnings in the user instruction manual shall be provided.
A warning label on the inside of such a panel may be used.
After correct reassembly of the parts in accordance with these instructions, maximum leakage rates contained
in this European Standard shall not be exceeded.
When the boiler case forms part of the combustion circuit and it can be removed without the use of tools:
 either the appliance shall not operate, or
 there shall be no leakage higher than the values given in Table 1 when the case is correctly replaced as
described in the manufacturers manual.
The ducts, bends, if any, and the terminal or adapter shall fit together correctly and shall form a stable
assembly. Parts intended to be dismantled for periodic servicing shall be designed and arranged so that
soundness is unaffected after re-assembly.
Any adapter shall allow a sound connection to be made to the system intended for the evacuation of
combustion products and supply of air.
5.4.2 Supply of combustion air and evacuation of the combustion products
5.4.2.1 General
All boilers shall be designed so that there is an adequate supply of combustion air during ignition and over the
whole range of possible heat inputs stated by the manufacturer.
5.4.2.2 Air supply and combustion products evacuation ducts
Assembly of the various parts during installation shall be such that no work is necessary other than adjusting
the length of the air supply and combustion products evacuation ducts. Adjusting the length of the ducts shall
not involve cutting, unless specifically recommended by the manufacturer. In this case, cutting shall be carried
out under the specific conditions recommended by the manufacturer to ensure soundness.
In all cases, such adaptations shall not impair the correct operation of the boiler.
It shall be possible, if necessary, to connect the boiler, air supply and combustion products evacuation ducts
and the terminal or fitting piece using ordinary tools. All necessary accessories and the fitting instructions shall
be supplied by the manufacturer.
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5.4.2.3 Boiler outlet socket
If the combustion products evacuation ducts are not supplied as part of the unit and dedicated to that unit,
then the connecting piece of the combustion products duct shall always be constructed as a socket (female
connector), so that the flow of condensate works only in the direction of the appliance.
The manufacturer shall define the requirements for the connecting piece for combustion air duct combustion
products duct by:
 naming a certain product type for the connecting piece, or
 giving measurements and acceptable tolerances for the connecting piece.
5.4.2.4 Terminal
Any horizontal terminal shall be designed so that any condensation is correctly discharged.
The manufacturer shall indicate the slope of the terminal in the installation instructions to ensure the correct
evacuation of condensates.
5.4.2.5 Terminal guard
The dimensions of the terminal guard, when installed in accordance with the manufacturer’s instructions, shall
be such that the distance between any part of the guard and the terminal, except the wall plate, exceeds
50 mm. The terminal guard shall have no sharp edges that are likely to cause injury. It shall be submitted to a
test laboratory for boiler tests.
5.5 Checking the state of operation
It shall be possible, perhaps after opening a door, to check at any time that the boiler is operating, either by
visual observation of the flame or by some other indirect means (e.g. an indicator light).
5.6 Maximum component temperatures
The maximum temperature of the components shall not exceed the maximum ambient temperature stated by
the component manufacturer under all normal operating conditions of the unit and at the maximum specified
air inlet temperature.
6 Operational requirements
6.1 Soundness of the combustion circuit
Boilers and, if relevant according to the classification, the ducts for combustion products evacuation and/or
combustion air supply belonging to the system, shall be sound in accordance with the requirements of
Table 1.
Soundness is verified before and after all the tests detailed in this European Standard. Ducts according to
EN 1457, EN 1856-1 and EN 14471 shall be designated P1; ducts for air supply shall be designated N2.
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EN 15035:2006 (E)
Table 1 — Soundness requirements
Boiler type
a Maximum leakage Test Test
Test sample Design
rate procedure pressure
C1 C3 C4 C5 C6 C8
Completely 3
3 m
/h 7.5.2 50 Pa X X X X X X
surrounded
b
Boiler
Not completely
3
0,6 m/h 7.5.2 (50 + x) Pa X X X X X X
surrounded
Completely 3
5 m/h 7.5.2 50 Pa X X X X — X
surrounded
c
Boiler + ducts
Not completely
3
1 m /h 7.5.2 (50 + x) Pa X X X X — X
surrounded
Combustion products Not completely 3 2 d
0,006 dm /s m 7.5.3 200 Pa X X X X — X
evacuation duct surrounded
3 2
Air supply duct / 0,5 dm /s m 7.5.3 200 Pa X X X X — X
a
  Completely surrounded means that all parts of the system which carry combustion products are completely surrounded by an enclosure/duct carrying air.
b
  The boiler shall be tested with the joints that ensure soundness between the combustion air duct and the boiler and between the boiler and the combustion
products evacuation duct.
c
  The length of ducts that are installed are the maximum available with correct operation of the boiler.
d
2
  m is related to the external duct area.
X = mandatory
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6.2 Safety of operation
6.2.1 Limiting temperatures
6.2.1.1 External temperature of the ducts
The temperature of the ducts in contact with, or passing through the walls of the dwelling shall not exceed the
surface temperature by more than 85 °C for an ambient temperature of 20 °C under the test conditions of
7.6.1.1.
However, when this temperature rise exceeds 65 °C, the manufacturer shall give the distance in mm for
combustible materials for which the temperature on the combustible material does not exceed 85 °C
according to the test in EN 13216-1.
When the ducts and terminal are not supplied by the manufacturer of the unit and not dedicated to it, then the
manufacturer shall declare the flue gas temperature for the nominal working temperature of the heating
appliance so that products, according to EN 13063-1 to EN 13063-2, EN 1856-1 and EN 14471 with given
distances to combustibles can be used to choose the temperature class according to EN 1443, see Table 2.
Table 2 — Temperature classes
Temperature class nominal working temperature test temperature
°C °C
T 080 ≤ 80 100
T 100 ≤ 100 120
T 120 ≤ 120 150
T 140 ≤ 140 170
T 160 ≤ 160 190
T 200 ≤ 200 250
T 250 ≤ 250 300
T 300 ≤ 300 350
T 400 ≤ 400 500
T 450 ≤ 450 550
T 600 ≤ 600 700

6.2.1.2 Combustion products discharge temperature
For type C type C and type C boilers, the manufacturer shall indicate the nominal working temperature
43, 63 83
so that adequate flues can be chosen.
6.2.1.3 Limiting temperatures of the side wall, the front and the top and the floor
When measured under the test conditions of 7.6.1.2, the requirements of EN 303-1 shall be met.
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6.2.2 Ignition
The boiler shall be turned on and correctly ignited, i.e. once the safety time has lapsed, as defined in EN 267.
Stable operation of the burner shall be noted:
 under normal conditions, as defined in 7.6.2.2, in a calm atmosphere;
 under special conditions, as defined in 7.6.2.3, under wind.
6.3 Performance requirements
6.3.1 Efficiency
Under the test conditions defined in 7.7, useful efficiency, expressed as a percentage, for a load that
corresponds to the useful maximum nominal output, and for a load that corresponds to 30 % of the maximum
nominal useful output, shall be no less than the values shown in Table 3.
Table 3 — Boiler output requirements
Efficiency at nominal output Efficiency at 30 % part load
Average temperature Efficiency Average temperature Efficiency
Boiler type
of water in the boiler requirement of water in the boiler requirement
°C % °C %


≥84 + 2 ·× log P ≥80 + 3 × log P
Standard boilers 70 ≥50
n n
Low temperature and

≥87,5 + 1,5 × log P ≥87,5 + 1,5 × log P
70 40
n n
condensation boilers

6.3.2 Required draught for type C boilers
83
The draught requirements of EN 303-2 apply.
The draught shall be determined under the test conditions defined in 7.7.
If the draught value exceeds the requirements of this standard, it shall be stated in the technical
documentation.
The manufacturer shall indicate in the installation instructions the characteristics of the chimney to which the
boiler can be connected.
6.3.3 Limiting values for emissions
6.3.3.1 Normal conditions
The smoke number shall be less than or equal to 1 during testing at nominal heat-output under the conditions
defined in 7.8.2.
-6
The amount of unburned hydrocarbons in the combustion products shall not exceed 10 × 10 (10 ppm), with
the exception of the first 20 s following initial fuel injection.
A flame ionisation detector (FID) is used to measure this content.
Combustion shall create little pollution. This requirement shall be met if the values in Table A.1 of
EN 303-2:1998 are not exceeded at nominal output, taking into account the weighting of pollutant emissions.
Emissions values are measured for fuel that meets the characteristics defined in 7.3.
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6.3.3.2 Special conditions
6.3.3.2.1 Carbon monoxide
CO content shall not exceed 0,20 % under the test conditions defined in 7.8.3.
6.3.3.2.2 Smoke number
The smoke number shall be ≤ 1 under the test conditions defined in 7.8.3. For units according to EN 303-4,
the smoke number shall be ≤ 2.
7 Test methods
7.1 General
The following clauses are generally applicable except where otherwise specified in particular clauses.
7.2 Boiler installation
The boiler is installed in accordance with the technical instructions in a well-ventilated, draught-free room (air
speed less than 0,5 m/s), which has an ambient temperature of about (20 ± 5) °C. The boiler is protected from
direct solar radiation.
Depending on the type of boiler, the manufacturer shall supply the boiler, fitted with all the accessories
necessary for installation (including its ducts), accompanied by the mounting instructions.
Wall-mounted boilers shall be installed on a vertical test panel of plywood or of a material with the same
thermal characteristics in accordance with the information in the manufacturer’s instructions. The plywood
panel shall be (25 ± 1) mm thick and painted matt black; the panel dimensions are
...