EN 15502-2-1:2012
(Main)Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW
General Information
- Abstract
This European Standard specifies, the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers".
Where the word boiler is used, it needs to be read as the boiler including its connecting ducts, ducts and terminals, if any.
This European Standard covers gas-fired central heating boilers from the types C1 up to C9 and the types B2, B3 and B5, according to the classification in CEN/TR 1749:
a) that have a nominal heat input (on the basis of net calorific value) not exceeding 1 000 kW;
b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437;
c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the water circuit does not exceed 6 bar;
e) which may or may not give rise to condensation under certain circumstances;
f) which are declared in the installation instructions to be either a "condensing" boiler or a "low temperature boiler" or a "standard boiler"; if no declaration is given the boiler is to be considered a "standard boiler";
g) which are intended to be installed either indoors or outdoors in a partially protected place;
h) which may include the facility to produce hot water, either by the instantaneous or storage principle, the whole being marketed as a single unit;
i) which are designed for either sealed water systems or for open water systems;
j) which are either modular boilers, or non- modular boilers.
This European Standard will be used in conjunction with the General Requirements Standard EN 15502-1.
This European Standard provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard, the risk associated with this alternative construction needs to be assessed.
An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the Gas Appliance Directive, is given in Clause 11.
This European Standard does not cover all the requirements for:
k) Appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex DD);
l) Appliances using flue dampers;
m) Appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81;
n) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
o) Appliances incorporating flexible plastic flue liners;
p) Appliances designed to become connected to a combined flue duct system that is designed to operate under overpressure (for example Ca));
q) Appliances incorporating a combined combustion products circuit that is designed to operate under overpressure (for example Cb));
r) Appliances intended to be connected to a (common) flue having mechanical extraction.
- Status
- Withdrawn
- Publication Date
- 23-Oct-2012
- Withdrawal Date
- 22-Sep-2026
- Technical Committee
- CEN/TC 109 - Central heating boilers using gaseous fuels
- Drafting Committee
- CEN/TC 109/WG 1 - Domestic central heating boilers using gaseous fuels
- Current Stage
- 9960 - Withdrawal effective - Withdrawal
- Start Date
- 14-Dec-2016
- Completion Date
- 23-Sep-2026
- Directive
- Not Harmonized2009/142/EC - Appliances burning gaseous fuels
Not Harmonized90/396/EEC - Appliances burning gaseous fuels
Relations
- Effective Date
- 31-Oct-2012
- Effective Date
- 31-Oct-2012
- Effective Date
- 31-Oct-2012
- Effective Date
- 31-Oct-2012
- Effective Date
- 31-Oct-2012
- Effective Date
- 18-Jan-2023
- Effective Date
- 25-Aug-2026
- Effective Date
- 25-Aug-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Refers
ISO 188:2011 - Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests - Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
- Effective Date
- 09-Feb-2026
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Frequently Asked Questions
EN 15502-2-1:2012 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW". This standard covers: This European Standard specifies, the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers". Where the word boiler is used, it needs to be read as the boiler including its connecting ducts, ducts and terminals, if any. This European Standard covers gas-fired central heating boilers from the types C1 up to C9 and the types B2, B3 and B5, according to the classification in CEN/TR 1749: a) that have a nominal heat input (on the basis of net calorific value) not exceeding 1 000 kW; b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437; c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation; d) where the maximum operating pressure in the water circuit does not exceed 6 bar; e) which may or may not give rise to condensation under certain circumstances; f) which are declared in the installation instructions to be either a "condensing" boiler or a "low temperature boiler" or a "standard boiler"; if no declaration is given the boiler is to be considered a "standard boiler"; g) which are intended to be installed either indoors or outdoors in a partially protected place; h) which may include the facility to produce hot water, either by the instantaneous or storage principle, the whole being marketed as a single unit; i) which are designed for either sealed water systems or for open water systems; j) which are either modular boilers, or non- modular boilers. This European Standard will be used in conjunction with the General Requirements Standard EN 15502-1. This European Standard provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard, the risk associated with this alternative construction needs to be assessed. An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the Gas Appliance Directive, is given in Clause 11. This European Standard does not cover all the requirements for: k) Appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex DD); l) Appliances using flue dampers; m) Appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81; n) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW; o) Appliances incorporating flexible plastic flue liners; p) Appliances designed to become connected to a combined flue duct system that is designed to operate under overpressure (for example Ca)); q) Appliances incorporating a combined combustion products circuit that is designed to operate under overpressure (for example Cb)); r) Appliances intended to be connected to a (common) flue having mechanical extraction.
This European Standard specifies, the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers". Where the word boiler is used, it needs to be read as the boiler including its connecting ducts, ducts and terminals, if any. This European Standard covers gas-fired central heating boilers from the types C1 up to C9 and the types B2, B3 and B5, according to the classification in CEN/TR 1749: a) that have a nominal heat input (on the basis of net calorific value) not exceeding 1 000 kW; b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437; c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation; d) where the maximum operating pressure in the water circuit does not exceed 6 bar; e) which may or may not give rise to condensation under certain circumstances; f) which are declared in the installation instructions to be either a "condensing" boiler or a "low temperature boiler" or a "standard boiler"; if no declaration is given the boiler is to be considered a "standard boiler"; g) which are intended to be installed either indoors or outdoors in a partially protected place; h) which may include the facility to produce hot water, either by the instantaneous or storage principle, the whole being marketed as a single unit; i) which are designed for either sealed water systems or for open water systems; j) which are either modular boilers, or non- modular boilers. This European Standard will be used in conjunction with the General Requirements Standard EN 15502-1. This European Standard provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this standard, the risk associated with this alternative construction needs to be assessed. An example of an assessment methodology, based upon risk assessment and which covers the essential requirements of the Gas Appliance Directive, is given in Clause 11. This European Standard does not cover all the requirements for: k) Appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex DD); l) Appliances using flue dampers; m) Appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81; n) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW; o) Appliances incorporating flexible plastic flue liners; p) Appliances designed to become connected to a combined flue duct system that is designed to operate under overpressure (for example Ca)); q) Appliances incorporating a combined combustion products circuit that is designed to operate under overpressure (for example Cb)); r) Appliances intended to be connected to a (common) flue having mechanical extraction.
EN 15502-2-1:2012 is classified under the following ICS (International Classification for Standards) categories: 27.060.30 - Boilers and heat exchangers; 91.140.10 - Central heating systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 15502-2-1:2012 has the following relationships with other standards: It is inter standard links to EN 483:1999/A4:2007, EN 483:1999, EN 483:1999/A2:2001, EN 15420:2010, EN 483:1999/A2:2001/AC:2006, EN 15502-2-1:2012+A1:2016, ISO 37:2005, ISO 815-2:2008, ISO 815-1:2008, ISO 2781:2008, ISO 7619-1:2010, ISO 6914:2008, ISO 188:2011, ISO 7619-2:2010, ISO 1817:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 15502-2-1:2012 is associated with the following European legislation: EU Directives/Regulations: 2009/142/EC, 90/396/EEC, 92/42/EEC; Standardization Mandates: M/066, M/BC/CEN/89/6. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 15502-2-1:2012 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Heizkessel für gasförmige Brennstoffe - Teil 2-1: Heizkessel der Bauart C und Heizkessel der Bauarten B2, B3 und B5 mit einer Nennwärmebelastung nicht größer als 1 000 kWChaudières de chauffage utilisant les combustibles gazeux - Partie 2-1: Norme spécifique pour les appareils de type C et les appareils de types B2, B3 et B5 dont le débit calorifique nominal est inférieur ou égal à 1 000 kWGas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW97.100.20Plinski grelnikiGas heaters91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 15502-2-1:2012SIST EN 15502-2-1:2013en,fr,de01-januar-2013SIST EN 15502-2-1:2013SLOVENSKI
STANDARDSIST EN 483:2001/A2:2002/AC:2006SIST EN 483:2001/A4:2008SIST EN 483:2001/A2:2002SIST EN 15420:2011SIST EN 483:20011DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15502-2-1
October 2012 ICS 27.060.30; 91.140.10 Supersedes EN 15420:2010, EN 483:1999English Version
Gas-fired central heating boilers - Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW
Chaudières de chauffage utilisant les combustibles gazeux - Partie 2-1: Norme spécifique pour les appareils de type C et les appareils de types B2, B3 et B5 dont le débit calorifique nominal est inférieur ou égal à 1 000 kW
Heizkessel für gasförmige Brennstoffe - Teil 2-1: Heizkessel der Bauart C und Heizkessel der Bauarten B2, B3 und B5 mit einer Nennwärmebelastung nicht größer als 1 000 kW This European Standard was approved by CEN on 18 August 2012.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15502-2-1:2012: ESIST EN 15502-2-1:2013
Standards replaced by this standard in combination with part 1 .72Annex BB (normative)
Test apparatus for type C2 boilers .74Annex CC (normative)
Test methods to determine the effects of long-term thermal load, long-term condensate exposure, condensing/ non- condensing cycling and resistance to UV radiation .75Annex DD (informative)
Variations in gas quality .76DD.1 Introduction .76DD.2 Considerations if boilers are intend to be used with larger variations in the gas quality77DD.2.1Specification of the acceptable variations.77DD.2.2Impact of the claimed range around a set value for the normal distributed gases .78DD.2.3Impact of the declared values .79DD.2.4Relation between the RG, the DLG and the ELG .79DD.2.5Self adapting appliances .80Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or provisions of EU Directive 2009/142/EC,
"Directive relating to appliances burning gaseous fuels (codified version)" (GAD) .81Annex ZB (informative)
Clauses of this European Standard addressing the methods for the verification of the efficiency of the EU Directive 92/42/EEC, relating to the efficiency of new hot boilers with an output of 4 – 400 kW.84Bibliography .85 SIST EN 15502-2-1:2013
Most aspects were already introduced for some boiler types, but are now valid for a larger group of boilers. a) Examples of modifications due to harmonisation: 1) Requirements for materials used for the flue function (8.101, 8.102, 8,103); 2) The soundness of the combustion circuit (8.2.2); b) New or generally reworded requirements: 1) Air proving (5.4.8, 5.4.9, 8.11.101); 2) Adjustment of gas air ration controllers (8.11.101); 3) Risk assessment (11); 4) Auxiliary energy use (10); SIST EN 15502-2-1:2013
Requirements for boiler cascades (8.101). EN 15502 is composed of the following parts: EN 15502-1, Gas-fired heating boilers — Part 1: General requirements and tests; EN 15502-2-1, Gas-fired central heating boilers — Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW (the present document);
prEN 15502-2-2, Gas-fired central heating boilers — Part 2-2: Specific standard for type B1 appliances of a nominal heat input not exceeding 70 kW. 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 15502-2-1:2013
Matters related to quality assurance systems, tests during production, and certificates of conformity of auxiliary devices are not dealt with in this series of European Standards. Relationship between this document and EN 15502-1, Gas-fired heating boilers Part 1: General requirements and tests: This European Standard is to be used in conjunction with EN 15502-1:2012 and follows the numbering structure of EN 15502-1:2012. This European Standard refers to clauses of EN 15502-1:2012 or adapts clauses by stating in the corresponding clause: shall be according to EN 15502-1:2012, (clause number) with the following modification shall be according to EN 15502-1:2012, (clause number) with the following addition EN 15502-1:2012, (clause number) is replaced by the following; EN 15502-1:2012, (clause number) is not applicable. This European Standard adds clauses or subclauses to the structure of EN 15502-1:2012 which are particular to this standard. It should be noted that these clauses and subclauses are not indicated as SIST EN 15502-2-1:2013
EN 15502-1:2012 are numbered starting from 101, or designated as Annex AA, BB, CC, etc. Annex AA lists those existing standards which are replaced by this standard in combination with EN 15502-1. After the DOW (3 years after publication of both EN 15502-1 and EN 15502-2-1 in the OJEU) the standards specified in Annex AA, for the appliance types covered in EN 15502-2-1, are withdrawn. Annex AA lists those existing appliance types for which CEN/TC109 standards are intended to be replaced by EN 15502-2-2. The standards listed in Annex AA are to be used until EN 15502-2-2 specifies that the standards are withdrawn for the appliance types indicated.
m) Appliances of the types B21, B31, B51, C21, C41, C51, C61, C71 and C81; n) C7 appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW; o) Appliances incorporating flexible plastic flue liners; p) Appliances designed to become connected to a combined flue duct system that is designed to operate under overpressure (for example Ca)); SIST EN 15502-2-1:2013
Requirements for metal chimneys
Part 1: System chimney products EN 1856-2:2009, Chimneys
Requirements for metal chimneys
Part 2: Metal flue liners and connecting flue pipes EN 10088-1:2005, Stainless steels Part 1: List of stainless steels EN 13216-1:2004, Chimneys
Test methods for system chimneys
Part 1: General test methods EN 13501-1:2007, Fire classification of construction products and building elements
Part 1: Classification using data from reaction to fire tests EN 14241-1:2005, Chimneys
Elastomeric seals and elastomeric sealants
Material requirements and test methods Part 1: Seals in flue liners EN 14471:2005, Chimneys
System chimneys with plastic flue liners
Requirements and test methods EN 15502-1:2012, Gas-fired heating boilers Part 1: General requirements and tests EN ISO 178:2010, Plastics
Determination of flexural properties (ISO 178:2010) EN ISO 179-1:2010, Plastics
Determination of Charpy impact properties
Part 1: Non-instrumented impact test (ISO 179-1:2010) EN ISO 527-1:1996, Plastics
Determination of tensile properties
Part 1: General principles (ISO 527-1:1993 including Corr 1:1994) EN ISO 527-2:1996, Plastics
Determination of tensile properties
Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2:1993 including Corr 1:1994) EN ISO 1183-1:2004, Plastics Methods for determining the density of non-cellular plastics Part 1: Immersion method, liquid pyknometer method and titration method (ISO 1183-1:2004) SIST EN 15502-2-1:2013
Determination of ring stiffness (ISO 9969:2007) ISO 37:2005, Rubber, vulcanized or thermoplastic
Determination of tensile stress-strain properties ISO 188:2011, Rubber, vulcanized or thermoplastic
Accelerated ageing and heat resistance tests ISO 815-1:2008, Rubber, vulcanized or thermoplastic
Determination of compression set Part 1: At ambient or elevated temperatures ISO 815-2:2008, Rubber, vulcanized or thermoplastic
Determination of compression set Part 2: At low temperatures ISO 1817:2011, Rubber, vulcanized or thermoplastic
Determination of the effect of liquids ISO 2781:20081), Rubber, vulcanized or thermoplastic
Determination of density ISO 6914:2008, Rubber, vulcanized or thermoplastic
Determination of ageing characteristics by measurement of stress relaxation in tension ISO 7619-1:2010, Rubber, vulcanized or thermoplastic
Determination of indentation hardness Part 1: Durometer method (Shore hardness) ISO 7619-2:2010, Rubber, vulcanized or thermoplastic
Determination of indentation hardness Part 2: IRHD pocket meter method 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 15502-1:2012, EN 437:2003+A1:2009 and the following apply. They are numbered in accordance with the specific groups they belong to.
3.1.3.101 ducts support accessory used to fix, or transfer the load of, air supply and combustion products evacuation ducts to structural elements (building, etc.) 3.1.3.102 overheat combustion products temperature maximum temperature of the combustion products in case of overheat, at the exit of the boiler where it is intended to be connected to a duct, flue or chimney 3.1.3.103 nominal working combustion products temperature maximum temperature of the combustion products in case of normal functioning, at the exit of the boiler where it is intended to be connected to a duct, flue or chimney
1) This document is impacted by the following amendment: ISO 2781:2008/Amd 1:2010, Precision data. SIST EN 15502-2-1:2013
3.1.3.106 fitting piece device which allows the fitting of: a) the air supply and combustion products evacuation ducts to a single shared duct for type C2 boilers; b) the air supply and combustion products evacuation ducts to two ducts of a shared duct system for type C4 boilers; c) type C6 boilers to a system for air supply and combustion products evacuation that is approved and marketed independently from the boiler; d) the combustion products evacuation duct to a chimney that is part of the building for type C8 boilers; e) the air supply duct to a chimney that is part of the building for type C9 boilers; f) type B2 boilers to a system for combustion products evacuation that is approved and marketed independently from the boiler; g) the combustion products evacuation duct to a shared duct system for type B3 boilers 3.1.3.107 terminal guard device that protects the terminal from mechanical damage from outside influences 3.1.3.108 secondary flue part of the flue of a type C7 boiler between the draught diverter/air inlet in the roof space loft and the combustion products outlet above the roof 3.1.3.109 roof space loft ventilated part of a building between the uppermost inhabitable space of the building and the roof 3.1.3.110 modular boiler boiler consisting of an assembly of two or more generally identical modules, each of which consists of a heat exchanger, burner, control and safety devices Note 1 to entry: The assembly has a single flue outlet and a common gas connection, common electricity supply connection and common flow and return water temperature connections. Each module is capable of independent operation. SIST EN 15502-2-1:2013
4 Classification Shall be according to EN 15502-1:2012, Clause 4.
5 Construction 5.1 General Shall be according to EN 15502-1:2012, 5.1 with the following addition: Where the word boiler is used, it shall be read as the boiler including its connecting ducts, ducts and terminals, if any.
5.2 Conversion to different gases Shall be according to EN 15502-1:2012, 5.2. 5.3 Materials 5.3.1 General Shall be according to EN 15502-1:2012, 5.3.1 with the following addition: If there is a risk of condensation in the combustion products circuit it shall comprise materials which comply with the requirements of EN 15502-1:2012, 5.4.13.1. Other materials may be used when evidence is provided of their suitability for conditions in which condensation can occur. SIST EN 15502-2-1:2013
a) the requirements in Table 101, or b) a corrosion test method from normative Annex A of EN 1856-1:2009. SIST EN 15502-2-1:2013
Metallic combustion products circuit material specifications Material Symbol Minimum Nominal Thickness non- condensing b mm
Minimum nominal Thickness condensing b mm
EN 573-1 Aluminium designation
EN AW – 4047A EN AW Al Si 12 (A), and CU <0,1 %, Zn<0,15 % (cast aluminium) 0,5 1,5 EN AW – 1200A EN AW-AL 99,0 (A) 0,5 1,5 EN AW-6060 EN AW-AI MgSi 0,5 1,5 EN 10088-1 Steel number
EN 10088-1 Steel name
1.4401 X5CrNiMo 17-12-2 0,4 0,4 1.4404a X2CrNiMo 17-12-2 0,4 0,4 1.4432 X2CrNiMo 17-12-3 0,4 0,4 1.4539 X1NiCrMoCu 25-20-5 0,4 0,4 1.4401 X5CrNiMo 17-12-2 0,11c 0,11c 1.4404a X2CrNiMo 17-12-2 0,11c 0,11c 1.4432 X2CrNiMo 17-12-3 0,11c 0,11c 1.4539 X1NiCrMoCu 25-20-5 0,11c 0,11c a Equivalent for material No 1.4404 = 1.4571 (symbol X6CrNiMoTi 17-12-2). b The condensing column shall be used if, under normal operation conditions, condensate is produced in the combustion products circuit (according to 3.1.3.8). c Flexible liners (when installed in an existing chimney).
The actual minimum thickness of the materials shall always be greater than 90 % of the minimum nominal thicknesses. 5.4 Method of construction 5.4.1 Design Shall be according to EN 15502-1:2012, 5.4.1. 5.4.2 Checking the state of operation Shall be according to EN 15502-1:2012, 5.4.2. 5.4.3 Use and servicing Shall be according to EN 15502-1:2012, 5.4.3. SIST EN 15502-2-1:2013
Any horizontal terminal for non-condensing boilers shall be designed in such a way that any condensate which may form is discharged away from the surface of the wall to which the terminal is fitted. Any horizontal terminal for condensing boilers shall be designed in such a way that condensate is directed towards the appliance. SIST EN 15502-2-1:2013
Except for boilers with gas/air ratio controls, before each fan start it shall be checked that there is no simulation of air flow in the absence of air flow. The system for supervision of the combustion air rate or combustion products rate is activated directly by the flow of combustion air or combustion products. This is also valid for boilers with more than one fan speed in which the flows associated with each fan speed are monitored. The supply of combustion air shall be checked by one of the following methods: a) gas /air ratio controls; b) continuous supervision of the combustion air rate or combustion products rate; c) start up supervision of the combustion air rate or combustion products rate provided that: 1) The combustion products circuit is completely surrounded by the air supply circuit, or the leakage rate of the combustion products circuit meets the requirements of 8.2.2.102.2 and 2) There is a shutdown at least every 24 h2) and 3) There is an indirect system for air proving (e.g. fan speed supervision) during operation. 5.4.9 Gas/air ratio controls Shall be according to EN 15502-1:2012, 5.4.9 with the following addition: If the installation instructions state (see 12.2.1.2) that the gas/air ratio control settings are not intended to be adjustable by a gas operative during installation, appliance service or when the gas valve is replaced then the appliance
2) Some boilers will be used in a way that it is very likely they will shutdown at least once per 24 h without having a specific function to ensure this. SIST EN 15502-2-1:2013
An example of a suitable provision is to use a paint spot on the adjusting device. The appliance installations shall include instructions on how the settings shall be checked if, at the time of installation or service, there is an indication that the gas/air ratio control settings have been altered. The appliance installation instructions shall indicate the action to be taken if the settings are found to be incorrect. If the appliance installation instructions allow the gas/air ratio controls to be adjusted then the method for adjustment shall be described. 5.4.10 Fan Shall be according to EN 15502-1:2012, 5.4.10.
5.4.11 Drainage Shall be according to EN 15502-1:2012, 5.4.11. 5.4.12 Operational safety in the event of failure of the auxiliary energy Shall be according to EN 15502-1:2012, 5.4.12. 5.4.13 Special provision for Low Temperature Boilers and Condensing Boilers This subclause of Part 1 applies but with the following changes:
5.4.13.1 Materials in contact with condensate Shall be according to EN 15502-1:2012, 5.4.13.1 5.4.13.2 Discharge of condensate
EN 15502-1:2012, 5.4.13.2 is replaced by the following: Requirements Condensing boilers shall be fitted with a condensate discharge system of corrosion-resistant material or covered by a durable protection against corrosion.
a) it can be easily inspected and cleaned in accordance with the manufacturer's instructions; and b) it cannot transmit combustion products into the room where the boiler is installed; this requirement is met if the disposal system incorporates a water trap. The water trap shall meet 2 requirements: 1) The water trap should have a seal of at least 25 mm water column.
2) The functional operation of the water trap will be tested under the blockage tests b) of 8.11.101.2 or 8.11.101.3.2. In that condition there shall be no leakage of combustion products into the room where the boiler is installed. Surfaces in contact with condensates (except purpose provided drains, water traps and siphons) shall be designed to prevent condensate retention.
It shall be possible to service and clean the system easily. There may be a common condensate drain for flue gas exhaust and the condensing boiler.
Test conditions By measurements, visual inspection or manual tests it is checked whether the requirements for the condensate discharge are fulfilled. 5.4.13.3 Control of the combustion products temperature Shall be according to EN 15502-1:2012, 5.4.13.3. 5.4.13.4 Chemical composition of the condensate Shall be according to EN 15502-1:2012, 5.4.13.4. 5.5 Burners Shall be according to EN 15502-1:2012, 5.5. 5.6 Pressure test points Shall be according to EN 15502-1:2012, 5.6. 5.7 Requirements for the application of control and safety devices 5.7.1 General Shall be according to EN 15502-1:2012, 5.7.1 5.7.2 Adjusters and range-rating devices
Shall be according to EN 15502-1:2012, 5.7.2. SIST EN 15502-2-1:2013
Shall be according to EN 15502-1:2012, 5.7.3. 5.7.4 Gas pressure regulator
Shall be according to EN 15502-1:2012, 5.7.4. 5.7.5 Ignition devices
Shall be according to EN 15502-1:2012, 5.7.5. 5.7.6 Flame supervision devices 5.7.6.1 General
Shall be according to EN 15502-1:2012, 5.7.6.1. 5.7.6.2 Thermoelectric flame supervision device Shall be according to EN 15502-1:2012, 5.7.6.2 with the following addition: It is permitted to use a burner ≤ 150 kW using a thermoelectric flame supervision device provided that the additional heat input is supervised by an automatic burner control system (see 8.11.6.2). 5.7.6.3 Automatic burner control system Shall be according to EN 15502-1:2012, 5.7.6.3. 5.7.7 Gas/air ratio controls Shall be according to EN 15502-1:2012, 5.7.7. 5.7.8 Thermostats and water temperature limiting devices Shall be according to EN 15502-1:2012, 5.7.8. 5.7.9 Remote control Shall be according to EN 15502-1:2012, 5.7.9. 5.7.10 Expansion vessel and pressure gauge Shall be according to EN 15502-1:2012, 5.7.10. 5.7.11 Protection against frost for boilers intended to be installed in a partially protected place Shall be according to EN 15502-1:2012, 5.7.11. 5.7.12 Adjusting, control and safety devices for the domestic hot water circuit Shall be according to EN 15502-1:2012, 5.7.12. SIST EN 15502-2-1:2013
Where it is possible to close off the water flow to individual modules, it shall not be possible to operate the isolated module(s) if this could result in a hazardous condition. 6 Electrical safety Shall be according to EN 15502-1:2012, Clause 6. 7 Controls Shall be according to EN 15502-1:2012, Clause 7. 8 Operational requirements 8.1 General Shall be according to
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