SIST EN 303-1:2017
(Main)Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology, general requirements, testing and marking
Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology, general requirements, testing and marking
This European Standard applies to boilers used for central heating (heating boilers) with forced draught burners with a nominal heat output not exceeding 1 000 kW, which are operated either with negative pressure (natural draught boilers) or with positive pressure (pressurized boiler) in the combustion chamber, in accordance with the boiler instructions.
This European Standard specifies the necessary terminology, the requirements on the materials and testing of them, and marking requirements for heating boilers.
Particular requirements for boilers that can be used with open vented systems are contained in EN 303 4.
The requirements of this standard apply to heating boilers that are tested on an authorized test rig.
Boilers in accordance with this standard are designed for the heating of central heating installations in which the heat carrier is water, and the maximum allowable operating temperature of which is restricted to 100 °C. The maximum allowable operating pressure is 8 bar.
For boilers and water heaters (storage or continuous flow heater) this standard only applies to the parts which are necessarily subject to the operating conditions of the heating boiler (heating part).
This standard does not apply to gas boilers with atmospheric burners, boilers for solid fuels, boilers with oil vaporization burners. For these boilers there are further requirements.
Heizkessel - Teil 1: Heizkessel mit Gebläsebrenner - Begriffe, Allgemeine Anforderungen, Prüfung und Kennzeichnung
Diese Europäische Norm gilt für Kessel von Zentralheizungen (Heizkessel) mit Gebläsebrennern bis zu einer Nennwärmeleistung von 1 000 kW, die nach den Festlegungen des Kesselherstellers entweder mit Unterdruck (Naturzugkessel) oder mit Überdruck (Überdruckkessel) im Brennraum betrieben werden.
Diese Norm legt die notwendigen Begriffe sowie die Anforderungen an Werkstoffe, Prüfungen und Kennzeichnungen für Heizkessel fest.
Für Heizkessel, die in offenen Heizungsanlagen betrieben werden, gilt EN 303-4.
Die Anforderungen dieser Norm gelten für Heizkessel, die auf einem zugelassenen Prüfstand geprüft werden.
Heizkessel in Übereinstimmung mit dieser Norm sind für die Beheizung von zentralen Heizungsanlagen bestimmt, deren Wärmeträger Wasser mit einer maximal zulässigen Betriebstemperatur von 100°C ist. Der maximal zulässige Betriebsdruck ist 8 bar.
Diese Norm gilt nur für die Bauelemente von Heizkesseln und Wassererwärmern (Speicher- oder Durchlaufwassererwärmer), die den Betriebsbedingungen des Heizkessels zwangsläufig unterworfen sind (Heizungsteil).
Die Norm gilt nicht für Gasheizkessel mit atmosphärischen Brennern, Heizkessel für feste Brennstoffe und Heizkessel mit Ölverdampfungsbrennern. Für diese Kessel sind andere Anforderungen zu erfüllen.
Chaudières de chauffage - Partie 1 : Chaudières avec brûleurs à air soufflé - Terminologie, prescriptions générales, essais et marquage
La présente Norme européenne s'applique aux chaudières de chauffage central (chaudières de chauffage) équipées de brûleurs à air soufflé d'une puissance utile nominale inférieure ou égale à 1 000 kW, fonctionnant soit en dépression (chaudières à tirage naturel), soit en pression (chaudières pressurisées) dans la chambre de combustion, selon les indications du fabricant de la chaudière.
La présente norme spécifie la terminologie nécessaire, les exigences relatives aux matériaux et aux essais qui s'y rapportent, ainsi que les exigences de marquage pour les chaudières de chauffage.
Pour les chaudières qui peuvent être utilisées avec un vase d’expansion ouvert, les exigences particulières de construction sont précisées dans l'EN 303-4.
Les exigences de la présente norme s'appliquent aux chaudières de chauffage soumises à essai sur un banc d'essai agréé.
Les chaudières conformes à la présente norme sont conçues pour le chauffage d'installations de chauffage central dont le fluide caloporteur est l'eau et dont la température de fonctionnement maximale autorisée est limitée à 100 °C. La pression de service maximale autorisée est de 8 bar.
Pour les chaudières mixtes et les chauffe-eau (dispositif de chauffage à accumulation ou à production instantanée), la présente norme s'applique uniquement aux éléments qui sont nécessairement soumis aux conditions de fonctionnement de la chaudière de chauffage (partie chauffage).
La présente norme ne s'applique pas aux chaudières à gaz à brûleur atmosphérique, aux chaudières pour combustibles solides, ni aux chaudières à brûleur fioul à caléfaction. Ces chaudières sont soumises à d'autres exigences.
Kotli za gretje - 1. del: Kotli z ventilatorskimi gorilniki - Terminologija, splošne zahteve, preskušanje in označevanje
Ta evropski standard se uporablja za standardne kotle in nizkotemperaturne kotle z ventilatorskimi gorilniki z nazivno izhodno toploto, ki ne presega 1000 kW, ki delujejo bodisi z negativnim tlakom (kotli na naraven vlek) bodisi s pozitivnim tlakom (kotli pod tlakom) v zgorevalni komori, v skladu z navodili proizvajalca kotla. Ta standard določa potrebno terminologijo, zahteve glede materialov in njihovo preskušanje ter zahteve glede označevanja kotlov za gretje. Posebne zahteve za kotle, ki jih je mogoče uporabljati z odprtimi prezračevalnimi sistemi, so v standardu EN 303-4. Zahteve tega standarda veljajo za grelne kotle, ki se preskušajo na pooblaščeni napravi za preskušanje. Kotli za gretje v skladu s tem standardom so namenjeni za gretje v sistemih centralnega ogrevanja, pri čemer toploto prenaša voda. Najvišja dovoljena obratovalna temperatura je 100 °C, najvišji dovoljen obratovalni tlak pa 8 barov. V zvezi s kotli z vgrajenim ali pritrjenim (termoakumulacijskim ali pretočnim) grelnikom vode se ta standard uporablja le za tiste dele grelnika vode, za katere obvezno veljajo obratovalni pogoji kotla za gretje (grelni del). Ta standard se ne uporablja za plinske kotle z atmosferskimi gorilniki, kotle na trda goriva, kondenzacijske kotle na nafto ali plin in kotle z oljnimi uparjalniki. Za te kotle veljajo še dodatne zahteve.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2017
1DGRPHãþD
SIST EN 15034:2007
SIST EN 15034:2007/AC:2008
SIST EN 303-1:1999
SIST EN 303-1:1999/A1:2004
.RWOL]DJUHWMHGHO .RWOL]YHQWLODWRUVNLPLJRULOQLNL7HUPLQRORJLMDVSORãQH
]DKWHYHSUHVNXãDQMHLQR]QDþHYDQMH
Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology,
general requirements, testing and marking
Heizkessel - Teil 1: Heizkessel mit Gebläsebrenner - Begriffe, Allgemeine
Anforderungen, Prüfung und Kennzeichnung
Chaudières de chauffage - Partie 1 : Chaudières avec brûleurs à air soufflé -
Terminologie, prescriptions générales, essais et marquage
Ta slovenski standard je istoveten z: EN 303-1:2017
ICS:
01.040.91 Gradbeni materiali in gradnja Construction materials and
(Slovarji) building (Vocabularies)
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 303-1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2017
EUROPÄISCHE NORM
ICS 91.140.10 Supersedes EN 15034:2006, EN 303-1:1999
English Version
Heating boilers - Part 1: Heating boilers with forced
draught burners - Terminology, general requirements,
testing and marking
Chaudières de chauffage - Partie 1 : Chaudières avec Heizkessel - Teil 1: Heizkessel mit Gebläsebrennern -
brûleurs à air soufflé - Terminologie, prescriptions Begriffe, Allgemeine Anforderungen, Prüfung und
générales, essais et marquage Kennzeichnung
This European Standard was approved by CEN on 26 June 2017.
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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 303-1:2017 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions, units and symbols . 7
3.1 Terms and definitions . 7
3.2 Units and symbols . 10
3.2.1 Units . 10
3.2.2 Symbols . 11
4 Requirements . 11
4.1 Construction requirements . 11
4.1.1 General requirements . 11
4.1.2 Specific requirements . 23
4.2 Operational requirements . 25
4.2.1 General . 25
4.2.2 Verification of the nominal condensing output . 25
4.2.3 Formation of condensation . 25
4.2.4 Temperature of combustion products . 25
4.2.5 Surface temperature . 25
4.2.6 Water side resistance of the boiler . 26
4.2.7 Soundness of the boiler . 26
4.2.8 Temperature sensing control type TR and temperature sensing control type STB . 26
4.3 Electrical equipment . 26
4.3.1 Electrical safety . 26
4.3.2 Electromagnetic compatibility . 27
5 Tests . 27
5.1 General . 27
5.2 Boilers of steel or non-ferrous metal . 27
5.2.1 Tests to be carried out before production . 27
5.2.2 Factory production control (FPC) for steel boilers . 27
5.3 Boilers of cast iron or non-ferrous metals . 28
5.3.1 Test to be carried out before production . 28
5.3.2 Test during production . 28
5.4 Test for gas soundness . 29
5.5 Water side resistance measurement . 29
5.5.1 General . 29
5.5.2 Test rig for the establishment of the water side resistance . 29
5.6 Additional tests for low temperatures boilers . 31
5.6.1 Additional tests by using of corrosion resistant coatings . 31
5.6.2 Additional tests for oil-fired low temperatures boilers . 31
6 Marking . 31
6.1 Information on the boiler data plate . 31
6.2 Requirements of the data plate . 31
7 Technical documentation, scope of supply . 31
7.1 General . 31
7.2 Technical information (product fiche) and installation instructions . 31
7.3 Operating instructions . 33
7.4 Label . 33
Annex A (informative) Conformity evaluation . 34
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No [813/2013] aimed to be covered . 35
Annex ZB (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No [811/2013] aimed to be covered . 36
Bibliography . 37
European foreword
This document (EN 303-1:2017) 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 March 2018, and conflicting national standards shall
be withdrawn at the latest by March 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate M/534 and M/535 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 and Annex ZB, which are integral parts
of this document.
This document supersedes EN 303-1:1999 and EN 15034:2006.
The following essential changes have been made:
a) Construction requirements were adopted from EN 15034;
b) Terminology of EU-Regulations 811/2013 and 813/2013 adopted;
c) the document was completely revised technically;
d) the document was completely revised editorially.
The following structure is intended for the European Standards for heating boilers:
— EN 303-1, Heating boilers — Part 1: Heating boilers with forced draught burners — Terminology,
general requirements, testing and marking
— EN 303-2, Heating boilers — Part 2: Heating boilers with forced draught burners — Special
requirements for boilers with atomizing oil burners
— EN 303-3, Heating boilers — Part 3: Gas fired central heating boilers — Assembly comprising a boiler
body and a forced draught burner
— 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 303-5, Heating boilers — Part 5: Heating boilers for solid fuels, hand and automatically fired, with
a nominal heat output of up to 300 kW — Terminology, requirements, testing and marking
— EN 304, Heating boilers — Test code for heating boilers for atomizing oil burners
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
1 Scope
This European Standard applies to boilers used for central heating (heating boilers) with forced
draught burners with a nominal heat output not exceeding 1 000 kW, which are operated either with
negative pressure (natural draught boilers) or with positive pressure (pressurized boiler) in the
combustion chamber, in accordance with the boiler instructions.
This European Standard specifies the necessary terminology, the requirements on the materials and
testing of them, and marking requirements for heating boilers.
Particular requirements for boilers that can be used with open vented systems are contained in
EN 303-4.
The requirements of this standard apply to heating boilers that are tested on an authorized test rig.
Boilers in accordance with this standard are designed for the heating of central heating installations in
which the heat carrier is water, and the maximum allowable operating temperature of which is
restricted to 100 °C. The maximum allowable operating pressure is 8 bar.
For boilers and water heaters (storage or continuous flow heater) this standard only applies to the
parts which are necessarily subject to the operating conditions of the heating boiler (heating part).
This standard does not apply to gas boilers with atmospheric burners, boilers for solid fuels, boilers
with oil vaporization burners. For these boilers there are further requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 226:1987, Atomizing oil burners - Connecting dimensions between burners and heat generators
EN 303-2:2017, Heating boilers - Part 2: Heating boilers with forced draught burners - Special
requirements for boilers with atomizing oil burners
EN 303-4:1999, 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 304:2017, Heating boilers - Test code for heating boilers for atomizing oil burners
EN 10025-2:2004, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-
alloy structural steels
EN 10027-2:2015, Designation systems for steels - Part 2: Numerical system
EN 10028-2:2017, Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels
with specified elevated temperature properties
EN 10028-3:2017, Flat products made of steels for pressure purposes - Part 3: Weldable fine grain steels,
normalized
EN 10029:2010, Hot-rolled steel plates 3 mm thick or above - Tolerances on dimensions and shape
EN 10088-2:2014, Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of
corrosion resisting steels for general purposes
EN 10204:2004, Metallic products - Types of inspection documents
EN 13501-1:2007+A1:2009, Fire classification of construction products and building elements - Part 1:
Classification using data from reaction to fire tests
EN 14597:2012, Temperature control devices and temperature limiters for heat generating systems
EN 60335-1:2012, Safety of household and similar electrical appliances — Part 1: General requirements
(IEC 60335-1:2010)
EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60730-1:2011, Automatic electrical controls for household and similar use - Part 1: General
requirements (IEC 60730:2010), modified
EN 60730-2-9:2010, Automatic electrical controls for household and similar use - Part 2-9: Particular
requirements for temperature sensing controls (IEC 60730-2-9:2008), modified
EN 61000-6-2:2005, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for
industrial environments (IEC 61000-6-2:2005)
EN 61000-6-3:2007, Electromagnetic compatibility (EMC) - Part 6-3: Generic standards - Emission
standard for residential, commercial and light-industrial environments (IEC 61000-6-3:2006)
EN 60335-2-102:2016, Household and similar electrical appliances - Safety - Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections (IEC 60335-2-
102:2004, modified + A1:2008, modified + A2:2012, modified)
EN ISO 4063:2010, Welding and allied processes - Nomenclature of processes and reference numbers (ISO
4063:2009)
EN ISO 6506 (all parts), Metallic materials - Brinell hardness test
EN ISO 9606-1:2013, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012)
EN ISO 9606-2:2004, Qualification test of welders - Fusion welding - Part 2: Aluminium and aluminium
alloys (ISO 9606-2:2004)
EN ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories
(ISO/IEC 17025:2005)
ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 7-2:2000, Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by
means of limit gauges
ISO 185:2005, Grey cast irons - Classification
ISO 228-1:2000, Pipe threads where pressure-tight joints are not made on the threads — Part 1:
Dimensions, tolerances and designation
ISO 228-2:1987, Pipe threads where pressure-tight joints are not made on the threads — Part 2:
Verification by means of limit gauges
ISO 857-2:2005, Welding and allied processes — Vocabulary — Part 2: Soldering and brazing processes
and related terms
ISO 2553:2013, Welding and allied processes - Symbolic representation on drawings - Welded joints
ISO 7005-1:2011, Pipe flanges — Part 1: Steel flanges for industrial and general service piping systems
ISO 7005-2:1988, Metallic flanges — Part 2: Cast iron flanges
ISO 7005-3:1988, Metallic flanges — Part 3: Copper alloy and composite flanges
3 Terms and definitions, units and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
operating pressure
maximum allowable pressure at which the boiler is to be normally operated
Note 1 to entry: The operating pressure is less than the test pressure and the type test pressure.
3.1.2
test pressure
pressure to which all boilers and their parts are subjected during production
3.1.3
type test pressure
pressure to which the pre-production heating boiler(s) and associated parts are subjected before start
of mass production in the manufacturing works
3.1.4
operating temperature
maximum allowable temperature at which the boiler can be operated under normal operating
conditions at the maximum setting of the boiler’s water temperature controller
3.1.5
heat output
P
amount of heat transferred to the heat carrier (water) per unit of time
3.1.6
heat output range
span between the minimal and the maximal heat output over which the boiler meets the requirements
of this standard and over which it can be used, whether it is a range rated or a modulating boiler
3.1.7
nominal heat output
P
N
continuous output in accordance with the requirements of this standard
Note 1 to entry: The nominal heat output is equal to the rated heat output P4 according to EU Regulation
813/2013.
3.1.8
heat input
Q
B
amount of heat in unit time which is supplied to the furnace of the heating boiler by the fuel based on its
net calorific value
3.1.9
boiler efficiency
η
ratio of the heat output (P) to the heat input (Q ) supplied by the fuel
B
P
η=
Q
B
Note 1 to entry: η is equal to η4 according to EU Regulation 813/2013, if P is equal to 100 % P full load .
( )
N
Note 2 to entry: η is equal to η1 according to EU Regulation 813/2013, if P is equal to 0,3 × P .
N
3.1.10
draught
pressure differential between the static air pressure in the place of installation and the static pressure
of the exhaust gases, as measured in the exhaust gas measuring section, which is required for correct
operation of the boiler at nominal output
3.1.11
flue gas resistance
pressure differential between the combustion chamber and the boiler exit
3.1.12
combustion circuit
comprises all components between air inlet and flue gas outlet of boiler which may include the air
supply device, the burner, the combustion chamber, the heat exchanger and the flue gas evacuation
device
3.1.13
soundness of the boiler
limited leakage of the combustion circuit
3.1.14
flue gas temperature
T
dfg
temperature measured at the outlet of the boiler
3.1.15
flue gas loss
quantity of heat per unit time lost at the flue gas exit of the boiler
3.1.16
water side resistance
pressure loss across the boiler measured at the flow and return connections of the boiler, with a volume
flow corresponding to the nominal heat output
3.1.17
condensate
liquid formed from the combustion products during the condensation process
3.1.18
standard boiler
boiler for which the average water temperature can be restricted by design
3.1.19
low temperature boiler
boiler which can work continuously with a water return temperature of 35 ° to 40 °C or lower, possibly
producing condensation in certain circumstances without impairing the boiler’s operation and without
necessity of condensate drainage
Note 1 to entry: No nozzle for condensate drainage intended.
3.1.20
condensing boiler
boiler that, under normal operating conditions and at certain operating water temperatures, partially
condenses the water vapour in the combustion products in order to make use of the latent heat of water
vapour for heating purposes
Note 1 to entry: Always with nozzle for condensate drainage.
3.1.21
electrical power consumption at rated output
el
max
auxiliary electricalpower consumption at full load, expressed in kW
3.1.22
electrical power consumption at part load
el
min
auxiliary electrical power consumption at part load, expressed in kW
3.1.23
Electrical power consumption at standby
P
SB
auxiliary electrical power consumption of a heater in standby mode, expressed in kW
3.1.24
seasonal space heating energy efficiency in active mode
η
son
weighted average of the useful efficiency at rated heat output and the useful efficiency at 30 % of the
rated heat output, expressed in %
[SOURCE: EU Regulation 813/2013 Annex I, Definition 11]
3.1.25
seasonal space heating energy efficiency
η
s
ratio between the space heating demand for a designated heating season, supplied by a heater and the
annual energy consumption required to meet this demand, expressed in %
[SOURCE: EU Regulation 813/2013, §2 (20)]
Note 1 to entry: Weighted average of the useful efficiency at rated heat output and the useful efficiency at 30 %
of the rated heat output, expressed in % corrected with respect to control, the electrical consumption, the standby
heat loss and the pilot consumption if any.
3.1.26
temperature sensing control type TR
thermostat or modulating thermostat used in heat generating systems for controlling the temperature
of liquid or/and gaseous media, which has provisions for setting by the user and which, if equipped
with an electrical output, provides at least type 1B action
Note 1 to entry: See 2.2.4 and 2.2.6 of EN 60730–1:2011 and see 2.2.105 of EN 60730–2-9:2010.
3.1.27
temperature sensing control type STB
safety temperature limiter (thermal cut out, protective control) for heat generating systems which can
only be reset manually or by a tool and which provides at least the actions according to EN 14597
Note 1 to entry: Type 2K action will be considered to be provided if type 2N action is provided.
Note 2 to entry: Actions according to EN 14597: type 2B, type 2K, type 2P and type 2V and optionally any of the
following actions: type 2F and type 2N; the settings of this control are unchangeably fixed or can be fixed with a
tool or a special tool.
3.1.28
nominal condensing output
P
cond
value of useful output, in kW and corresponding to the operation of the boiler in a 50 °C/30 °C water
temperature regime
[SOURCE: EN 15034:2006, definition 3.2]
3.2 Units and symbols
3.2.1 Units
The unit system applied in this standard is the SI system, cf. ISO 80000-1 and others.
The following units and their multiples are used:
Length m (metre);
mm (millimetre);
Mass kg (kilogram);
Power kW (kilowatt);
Efficiency η (percent);
Other units applied:
Temperature °C (degrees Celsius).
3.2.2 Symbols
Table 1 — Symbols
Symbol Name Unit
P heat output kW
P nominal heat output kW
N
Q heat input kW
B
η boiler efficiency %
T exit flue gas temperature °C
dfg
el electrical power consumption at rated output kW
max
el electrical power consumption at part load kW
min
P electrical power consumption at standby kW
SB
η seasonal space heating energy efficiency in %
son
active mode
η seasonal space heating energy efficiency %
s
P nominal condensing output kW
cond
4 Requirements
4.1 Construction requirements
4.1.1 General requirements
4.1.1.1 Introduction
Boilers shall be fire-resistant and safe to operate. They shall be made of non-combustible materials and
shall be resistant to deformation and shall be such that:
— they can withstand the stresses arising during normal operation;
— the burner and the boiler cannot become heated to create a hazard;
— dangerous accumulations of combustible gases (fuels mixed with air) in the combustion chamber
and in the flues are prevented; and
— gases cannot leak from the boiler in dangerous quantities.
Combustible materials are allowable for:
— components of accessories, e.g. burner covers, if the parts are fitted outside of the boiler;
— internal components of controls and safety equipment;
— operating handles;
— electrical equipment;
— thermal insulation (see 4.1.1.6.9); all materials containing asbestos are forbidden.
Component parts of covers, operating, control and safety devices and electrical accessories shall be
arranged in such a way that their surface temperatures, under steady-state conditions, do not exceed
those specified either by the technical documentation or in the component part standard.
The materials for the parts subject to pressure shall be in accordance with generally accepted technical
requirements. They shall be suitable for the purpose and treatment intended. The mechanical and
physical properties as well as the chemical composition of the materials shall be guaranteed by the
relevant material producer/supplier.
All parts of the heating boiler likely to come into contact with condensation in condensing or low
temperature boilers shall be constructed of sufficiently corrosion resistant materials or materials
protected by a suitable coating, in order to ensure a reasonable life for a boiler that is installed, used
and maintained in accordance with the technical documentation. Fuel quality requirements shall be
declared in the technical documentation.
Surfaces in contact with condensate shall be designed to prevent condensate retention.
4.1.1.2 Drawings
The following shall be specified in the boiler drawings or in the relevant documents:
— the specified materials;
— the welding process, the weld type (generally the symbol for the weld type is sufficient) and the
welding fillers;
— the maximum allowable operating temperature in °C;
— the maximum allowable operating pressure in bar;
— the test pressure in bar;
— the nominal heat output or the heat output range for every boiler size in kW.
4.1.1.3 Factory production control (FPC)
4.1.1.3.1 General
The necessary tests according to the specification of the boiler shall be carried out by qualified
personnel and equipment during the factory production control of the boiler.
4.1.1.3.2 Boilers of steel and other non-ferrous metals
No leakage or significant permanent deformation shall occur during the test of “Factory production
control (FPC) for steel boilers” in the hydraulic test as described in (5.2.2).
A pneumatic test according to 5.2.2 may substitute the hydraulic test under the following conditions:
For safety reasons, the product of test pressure used for pneumatic test in bar and the volume of the
specimen in L is limited by < 200 bar × L.
NOTE The limit of 200 bar × L corresponds with the limit of Category I in Diagram 2 in PED (Pressure
Equipment Directive, 2014/68/EU).
4.1.1.3.3 Boilers of cast material
For cast iron parts subject to pressure the following tests shall be carried out using separately cast test
pieces for each cast:
1) tensile test in accordance with ISO 185, Type A; the values given in Table 5 are to be confirmed by
the tensile test;
2) chemical analysis (C, Si, Mn, P, S);
3) Brinell hardness test in accordance with EN ISO 6506 series;
4) Izod impact (for graphite iron).
The results of the tests shall either be recorded in registers countersigned by the works tester
responsible, or works certificates in accordance with EN 10204 shall be drawn up. Works certificates
and registers shall be kept for at least five years and shall be accessible for examination.
The repair of parts subject to pressure by welding is not permissible.
4.1.1.4 Heating boilers of steel and of non-ferrous materials
4.1.1.4.1 Execution of welding work
Welding work carried out on boilers shall meet the following requirements of EN ISO 9606-1 and
EN ISO 9606-2:
— only welders who are qualified in the welding of the materials to be processed may be used;
— equipment shall be available to allow defect free welding to be carried out;
— supervision of the welding shall be carried out by staff qualified in welding (at least one supervisor
shall be so qualified).
4.1.1.4.2 Welded joints and welding fillers
The materials shall be suitable for welding. The materials in accordance with Table 2 are suitable for
welding and do not require additional heat treatment after welding.
The welded joints shall not show any cracks or bonding faults and shall be defect free over the whole
cross-section for butt welds. One-sided fillet welds, and half Y-welds which have been welded through,
shall be kept substantially free from bending stresses. Smoke tubes, inserted stays and similar
components need not be counter welded. Double fillet welds are only permissible if sufficiently cooled.
Projections into the flue gas side in areas of high thermal stresses shall be avoided.
Corner welds, edge welds and similar welded connections which are subjected to high bending stresses
during production and operation are to be avoided.
For welded longitudinal stay bars or stay tubes the shearing cross section of the fillet weld should be at
least 1,25 times the required stay bar or stay tube cross sectional area.
See Table 3 (dimensions in mm) for details on the welding joints mentioned. Welding fillers shall be
suitable for the material being used.
The terms used in Table 3 are in accordance with ISO 2553. The reference numbers of welding
processes are in accordance with ISO 857-2 and EN ISO 4063.
4.1.1.4.3 Parts of steel subject to pressure
The steels listed in Table 2 shall be used.
Materials and wall thicknesses other than those specified shall only be used on the production of
appropriate evidence, with regard to (at least) their equivalent corrosion resistance, heat resistance
and strength to nonalloy steel at the material thicknesses specified in Table 3 for the particular
application/usage.
The specification of the materials shall be documented by a works certificate (see EN 10204). This does
not apply to small components, e.g. sockets up to DN 50, screws and nuts.
Table 2 — Materials
Material numbers in accordance
References Material type
with EN 10027–2
Hot rolled products of structural steels - non-alloy structural
EN 10025–2
steels
S235JR 1.0037
S235J RG2 1.0038
S235J0 1.0114
S235J2G3 1.0116
S275J R 1.0044
S275J0 1.0143
S275J2G3 1.0144
S355J R 1.0045
S355J0 1.0553
S355J2G3 1.0570
S355K2G3 1.0595
Flat products made of steels for pressure purposes – non-alloy
EN 10028–2
and alloy steels
P235G H 1.0345
P265G H 1.0425
P295G H 1.0481
P355G H 1.0473
16Mo3 1.5415
15NiCuMoNb5–6–4 1.6368
13CrMo4–5 1.7335
10CrMo9–10 1.7380
Material numbers in accordance
References Material type
with EN 10027–2
Flat products made of steels for pressure purposes –Weldable
EN 10028–3
fine grain steels, normalized
P355NL1 1.0566
EN 10088–2:2014 Stainless steels – corrosion resisting steels for general
(Table 3) purposes; Table 3: ferritic corrosion resisting steels
X2CrTiNb18 1.4509
X2CrMoTi18–2 1.4521
EN 10088–2:2014 Stainless steels – corrosion resisting steels for general
(Table 2) purposes; Table 2: austenitic ferritic corrosion resisting steels
X2CrMnNiN21–5–1 1.4162
X2CrNiN23–4 1.4362
EN 10088–2:2014 Stainless steels – corrosion resisting steels for general
(Table 1) purposes; Table 2: austenitic corrosion resisting steels
X5CrNi18–10 1.4301
X2CrNi18–9 1.4307
X6CrNi17–12–2 1.4401
X6CrNiTi18–10 1.4541
X6CrNiNb18–10 1.4550
X6CrNiMoTi17–12–2 1.4571
X6CrNiMoNb17–12–2 1.4580
X2CrNiMo18–14–3 1.4435
X3CrNiMo17–3–3 1.4436
X1NiCrMoCu25–20–5 1.4539
X2CrNiMo17–12–2 1.4404
Table 3 — Weld joints and welding processes
Material
thickness
Welding
No. Term Remarks
a
t process
mm
1.1 Square butt weld
135 Permissible up to
one side
≤ 6 12 t = 8 mm on use of deep
(8) 131 penetration electrodes or
(111) welding on both sides.
both sides
1.2 Square butt weld
Root gap b = 2 mm to
4 mm with stiffener,
≥ 6
up to 12 powder holder
necessary.
1.3 Square butt weld (double) Root gap b = 2 mm to
4 mm
> 8 Deep penetration
up to 12 electrodes shall be used
(111)
for manual electro
welding.
1.4 Single-V butt weld
Weld preparation V-
up to 12 (111)
seam 60°.
1.5 Single-V butt weld
Weld preparation V-
135 seam 30° to 50°
up to 12
12 depending on thickness
of material.
1.6 Double-V butt weld
Weld preparation double
greater 135 V-seam 30° to 50°
than 12 12 depending on material
thickness.
1.7 Butt weld between plates with raised Only permissible in
edges. Flange weld exceptional cases for
parts welded in.
135 Moreover, the welds
≤ 3 141 have to be kept largely
131 free from bending
stresses. Not suitable for
directly fired wall parts
s = 0,8 t.
Material
thickness
Welding
No. Term Remarks
a
t process
mm
1.8 Overlap welding
Welds of this type are to
be kept largely free from
≤ 6 bending stresses. Not
suitable for directly fired
wall parts s = t.
1.9 Overlap welding (cont)
Not suitable for directly
≤ 6
fired wall parts s = t.
(111)
2 Fillet weld
135 Welds of this type are to
≤ 6 12 be kept largely free from
(111) bending stresses a = t.
2.1 Double fillet weld 135
≤ 12 12 a = t
(111)
> 12 12 a = 2/3 t
(111)
2.2 Double-bevel butt weld 135
≤ 12 12 a = t
(111)
> 12 12 a = 2/3 t
(111)
2.3 Single-bevel butt weld 135
≤ 12 12 For (111) β = 60°
(111)
135 For 135, 12 β = 45° to
> 12
12 50°
2.4 Single-bevel butt weld
135 For (111) β = 60°
≤ 12 12 For 135, 12 β = 45° to
(111) 50°
Material
thickness
Welding
No. Term Remarks
a
t process
mm
2.5
Tube end shall not
135 project beyond fillet weld
≤ 12
(111) if it is subjected to heat
radiation.
2.6
135 Welding in of tube under
≤ 6
(111) high thermal stress a ≥ t.
2.7
Welding in of tube under
135 high thermal stress
(111) For (111) β = 60°
For 135 β = 45° to 50°.
a
Reference numbers of welding processes in accordance with ISO 857-2 or EN ISO 4063.
Reference number Process
12 Submerged arc welding
111 Metal-arc welding with covered electrode
131 Metal-arc inert gas welding; MIG welding
135 Metal-arc-active gas welding; MAG welding
141 Tungsten inert gas arc welding; TIG welding
() Use needs further consideration
4.1.1.4.4 Minimum wall thicknesses
The minimum wall thicknesses listed in Table 4 are specified having taken into consideration:
— the maximum allowable operating pressure;
— the nominal heat output and
— the material properties.
For boilers which consist of individual geometrically identical parts (sections) the requirements of the
minimum wall thickness for the complete range shall be in accordance with the boiler with the lowest
nominal heat output.
The wall thickness tolerance for carbon steels shall be as specified in EN 10029.
The nominal minimum wall thicknesses of Table 4 apply to sheets, tubes and forgings. Smaller wall
thicknesses are only permissible on production of evidence showing equivalent performance.
Table 4 — Minimum wall thicknesses
Copper, stainless steel and
Nominal heat output Carbon steels aluminium, etc.
corrosion protected steel
P t t t t t t
N a b c a b c
kW mm mm mm mm mm mm
P ≤ 100 4 3 2,9 2 2 1
N
100 < P ≤ 300 5 4 2,9 3 2 1
N
300 < P ≤ 1 000 6 5 2,9 4 2 1
N
ta thickness for walls of the combustion chamber in contact with fire and water and flat walls of the convection
heating surface,
t for walls only in contact with water and for rigidly stable (e.g. corrugated) convection heating surfaces
b
outside the combustion chamber,
tc for circular tubes which are used in the convection part of the heat exchanger.
4.1.1.5 Boilers of cast materials
4.1.1.5.1 Parts of cast iron subject to pressure
The mechanical properties of cast iron used for parts subject to pressure shall, as a minimum,
correspond to the values listed in Table 5.
Table 5 — Minimum requirements on cast iron
Cast iron with lamellar graphite (see ISO 185)
Characteristic Requirement
Tensile strength R ≥ 150 N/mm
m
Brinell hardness 160 HB to 220 HB 2,5/187,5
Spheroidal graphite iron (ferritically annealed):
Characteristic Requirement
Tensile strength R ≥ 400 N/mm
m
Izod impact ≥ 23 J/cm
4.1.1.5.2 Cast parts of non-ferrous metals subject to pressure
The mechanical properties of aluminium and aluminium alloys and copper and copper alloys used for
parts subject to pressure shall, as a minimum, correspond to the values listed in Table 6 and Table 7
respectively.
Table 6 —Aluminium and aluminium alloys
Tensile strength
Thickness Temperature range
(min.)
R
m
mm N/mm °C
Al 99,5 up to 50 75 min. up to 300
Al Mg2 Mn 0,8 up to 50 275 min. up to 250
Table 7 — Copper and copper alloys
Tensile strength
Thickness Temperature range
(min.)
R
m
mm N/mm °C
SF — Cu up to 5 200 up to 250
Cu Ni 30 Fe up to 10 310 up to 350
4.1.1.5.3 Minimum wall thicknesses
The wall thicknesses given in the production drawing shall not be less than the minimum wall
thicknesses listed in Table 8. The actual minimum wall thicknesses during manufacture of the boiler
sections and other parts subject to pressure shall be greater than 0,8 times the thickness given in the
drawing. Smaller wall thicknesses are only permissible on production of evidence showing equivalent
performance.
For boilers which consist of individual geometrically identical parts (sections) the requirements of the
minimum wall thickness for the complete range shall be in accordance with the boiler with the lowest
nominal heat output.
Table 8 — Minimum wall thicknesses of boiler sections of cast material
Nominal heat output Minimum wall thickness for cast iron with
spheroidal graphite/
P lamellar graphite, aluminium
N
annealed ferritic copper
kW mm mm
P ≤ 30 3,5 3,0
N
30 < P ≤ 70 4,0 3,5
N
70 < P ≤ 300 4,5 4,0
N
300 < P ≤ 1 000 5,5 5,0
N
4.1.1.6 Further requirements
4.1.1.6.1 Venting of the water space and flue gas passages
The boiler and its parts shall be designed in such a way that the water spaces can be properly vented.
The boiler shall be so designed that under normal operation in accordance with the technical
documentation no undue boiling noises occur.
The combustion chamber and the flue gas passages shall be designed in such a way that no dangerous
accumulation of combustible gases is possible.
4.1.1.6.2 Cleaning of heating surfaces
The heating surfaces shall be accessible from the flue gas side for inspection and cleaning with chemical
agents and brushes by means of a sufficient number and appropriate arrangement of cleaning openings.
If special tools (for example special brushes) are required for cleaning and maintenance of the boiler
these shall be supplied.
4.1.1.6.3 Inspection of the flame
A facility shall be provided which allows inspection of the flame. It shall permit assessment of the flame
and shall be arranged or designed in such a way th
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