SIST EN 26:2004/A3:2007
(Main)Gas-fired instantaneous water heaters for the production of domestic hot water, fitted with atmospheric burners - Amendment A3
Gas-fired instantaneous water heaters for the production of domestic hot water, fitted with atmospheric burners - Amendment A3
Amendment of 6.1.2 and addition of new Annex P.
Gasbeheizte Durchlauf-Wasserheizer für den sanitären Gebrauch
Appareils de production instantanée d'eau chaude pour usages sanitaires équipés de bruleurs atmosphériques utilisant les combustibles gazeux
Pretočni plinski grelniki z atmosferskim gorilnikom za pripravo sanitarne tople vode - Dopolnilo A3
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 26:2004/A3:2007
01-februar-2007
3UHWRþQLSOLQVNLJUHOQLNL]DWPRVIHUVNLPJRULOQLNRP]DSULSUDYRVDQLWDUQHWRSOH
YRGH'RSROQLOR$
Gas-fired instantaneous water heaters for the production of domestic hot water, fitted
with atmospheric burners - Amendment A3
Gasbeheizte Durchlauf-Wasserheizer für den sanitären Gebrauch
Appareils de production instantanée d'eau chaude pour usages sanitaires équipés de
bruleurs atmosphériques utilisant les combustibles gazeux
Ta slovenski standard je istoveten z: EN 26:1997/A3:2006
ICS:
91.140.65
SIST EN 26:2004/A3:2007 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 26:1997/A3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2006
ICS 91.140.65
English Version
Gas-fired instantaneous water heaters for the production of
domestic hot water, fitted with atmospheric burners
Appareils de production instantanée d'eau chaude pour Gasbeheizte Durchlauf-Wasserheizer für den sanitären
usages sanitaires équipés de brûleurs atmosphériques Gebrauch mit atmosphärischen Brennern
utilisant les combustibles gazeux
This amendment A3 modifies the European Standard EN 26:1997; it was approved by CEN on 4 September 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant 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 amendment 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 26:1997/A3:2006: E
worldwide for CEN national Members.
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EN 26:1997/A3:2006 (E)
Foreword
This document (EN 26:1997/A3:2006) has been prepared by Technical Committee CEN/TC 48 “Domestic gas-fired
water heaters”, the secretariat of which is held by AFNOR.
This Amendment to the European Standard EN 26:1997 shall be given the status of a national standard, either by
publication of an identical text or by endorsement, at the latest by April 2007, and conflicting national standards
shall be withdrawn at the latest by April 2007.
This amendment includes requirements relative to the metallic, plastic and other non-metallic materials that are
used in water heaters and which come into contact with water intended for human consumption. It is intended to
ensure that products of this kind complying with these requirements meet current technological development and
requirements which will result from the application of the EAS (European Approval Scheme) of the European
Commission, with regard to the service life of water heaters and their physiological suitability.
NOTE As long as no European regulations are enforced (EAS) national regulations stay in force.
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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EN 26:1997/A3:2006 (E)
6.1.2 Materials
Add a new subclause header “6.1.2.1 General”.
Replace the last paragraph with the following text:
“6.1.2.2 Metalli
...
SLOVENSKI SIST EN 26:2004/OprA3:2004
PREDSTANDARD
december 2004
Plinski pretočni grelniki vode za sanitarno rabo z atmosferskim gorilnikom –
Dopolnilo A3
Gas-fired instantaneous water heaters for sanitary uses production, fitted with
atmospheric burners - Amendment A3
ICS 91.140.65 Referenčna številka
SIST EN 26:2004/OprA3:2004(en;fr;de)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
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EUROPEAN STANDARD
DRAFT
EN 26:1997
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA3
October 2004
ICS
English version
Gas-fired instantaneous water heaters for sanitary uses
production, fitted with atmospheric burners
Appareils de production instantanée d'eau chaude pour Gasbeheizte Durchlauf-Wasserheizer für den sanitären
usages sanitaires équipés de brûleurs atmosphériques Gebrauch mit atmosphärischen Brennern
utilisant les combustibles gazeux
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 48.
This draft amendment A3, if approved, will modify the European Standard EN 26:1997. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.
This draft amendment was established by CEN 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 Management Centre 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, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 26:1997/prA3:2004: E
worldwide for CEN national Members.
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EN 26:1997/prA3:2004 (E)
Foreword
This document (EN 26:1997/prA3:2004) has been prepared by Technical Committee CEN/TC 48 “Gas-fired water
heaters”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This amendment includes requirements relative to the metallic, non-metallic and other non-metallic materials that
are used in appliances and which come into contact with water intended for human consumption. It is intended to
ensure that products of this kind complying with these requirements meet current technological development and
requirement resulting of the application of the EAS (European Approval Scheme) of the European Commission,
with regard to appliances service life and physiological suitability.
Note : as long as no European regulations are enforced (EAS scheme) national regulations with regard to hygienic assessment
stay in force.
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EN 26:1997/prA3:2004 (E)
2 Normative references
Add the following standards :
“ ISO 2722, Methods of testing vitreous enamel finishes - Resistance to citric acid at room temperature.
ISO 2744, Methods of testing vitreous enamel - Determination of resistance to boiling water and water vapour.”
6.1.2 Materials
Replace the last paragraph by the new clause :
« 6.1.2.1 Metallic materials
6.1.2.1.1 Corrosion-resistance metallic materials
Provided that the appliances is used in accordance with the manufacturer’s instructions :
The functionning of components manufactured from corrosion-resistant metallic materials shall not be affected
by corrosion within the expected service life of the appliance, and
no special maintenance shall be required to keep the components in good working order.
6.1.2.1.2 Requirements on metallic materials
Materials that come into contact with water intended for human consumption shall be constituted in such way that
they withstand the mechanical, chemical and thermal stresses to which they are exposed during the service life of
the appliance and do not contaminate the water supplied.
Metallic materials shall be corrosion-resistant. Metallic materials are considered to satisfy the requirements with the
respect to corrosion protection :
if the material used are enamelled (one or more layers) and equipped with cathodic corrosion protection, or
where types of stainless steel containing a minimum of 16 % chrome are used, or
where they are assessed as acceptable to the national regulations in force.
Examples for the selection of metallic materials (steel, and copper and copper alloys) are given in L.1 and L.2.
6.1.2.2 Enamelling
With regard to the use of enamelling to provide protection from corrosion for surfaces of tanks that come into
contact with water intended for human consumption, the following definitions and requirements should be met :
Enamelling
Enamelling involves the use of composite material made of a vitreous substance (enamel) suited to this purpose
and steel. The enamel coating may be single or multiple-layered.
Flaws
Flaws are defects that leave the metallic substrate exposed (e.g. pores, scratches, cracks and chips). All flaws are
electrically conductive and should not cover an area larger than 2 mm on flat surface, 10 mm on edges, weld seam
overlaps, brackets, baffle plates, etc, and 4 mm on weld seams.
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EN 26:1997/prA3:2004 (E)
Copperheads
Copperheads are spots in enamelling formed by saturation of the material with iron oxide during firing and may be
electrically conductive. Copperheads are only permissible on edges and weld seams. They should not cover an
area of more than 2 mm.
Layer thickness
Layer thickness is the thickness of the enamel coating and shall range between 0,15 mm and 0,5 mm. If thicker
coatings in specific places are inevitable for technical reasons, this is only permissible to a limited extend, and the
coating may not exceed a layer thickness of 1 mm.
Cathodic corrosion protection
Cathodic corrosion protection is an electrochemical corrosion protection procedure, in which any flaw present in the
enamelled inner surface of a tank is converted into the cathode of a galvanic element by the installation of a device
that acts as an anode (galvanic anode, external current anode).
Standard protective current requirement
The standard protective current requirement is the current density that is calculated from the current flowing
between the anode and the tank proportional to the enamel surface in contact with the water, taking account of
correction values for the measuring voltage, the electrical conductivity of the test solution and the mass of the
anode. It is an integral measure for the uptake of protective current by the flaws and copperheads in an enamelled
steel tank.
2
The limit value 22,5 mA/m should not be exceeded during the test.
The test set-up is shown in Figure 12 below.
Figure 12 - Test for the evaluating of the standard protective current
The test solution used is tap water, to which a sodium chloride solution is added until its electrical conductivity
reaches approx. 1000 µS/cm at the test temperature of 20 °C.
The test anode is a degreased magnesium rod anode with a diameter of between 22 mm to 33 mm that is built into
2
the tank and electrically isolated. The mass of the anode shall be at lea
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