SIST EN 12897:2016
(Main)Water supply - Specification for indirectly heated unvented (closed) storage water heaters
Water supply - Specification for indirectly heated unvented (closed) storage water heaters
This European Standard specifies the constructional and performance requirements and methods of test for indirectly heated, unvented (closed) storage water heaters of up to 2000 l volume suitable for connection to a water supply at a pressure between 0,05 Mpa and 1,0 Mpa (0,5 and 10 bar), and fitted with control and safety devices designed to prevent the temperature of the stored drinking water from reaching 100 °C.
Whilst storage water heaters intended primarily for direct heating are not covered by this standard, it does allow the provision of electric heating elements for auxiliary use.
Wasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene) Speicher-Wassererwärmer
Diese Europäische Norm legt die Anforderungen an die Konstruktionstechnik und die Leistung und Prüf-verfahren für mittelbar (indirekte) beheizte, unbelüftete (geschlossene) Speicher-Wassererwärmer bis zu 2 000 l Volumen fest, die für den Anschluss an ein Wasserversorgungssystem bei einem Druck zwischen 0,05 MPa und 1,0 MPa (0,5 bar und 10 bar) geeignet und mit Regel- und Sicherheitseinrichtungen ausge-rüstet sind, die so ausgelegt sind, dass die Temperatur des gespeicherten Trinkwassers 95 °C nicht übersteigt.
Obwohl diese Norm keine Speicher-Wassererwärmer behandelt, die hauptsächlich für direkte Erwärmung vorgesehen sind, lässt sie die Bereitstellung von elektrischen Heizelementen zu Hilfszwecken zu.
Alimentation en eau - Prescriptions pour réservoirs de stockage d'eau chaude à chauffage indirect sans mise à l'air libre (fermés)
La présente Norme européenne définit les exigences de construction et de performance et les méthodes d'essai applicables aux préparateurs d’eau chaude par accumulation à chauffage indirect non ouverts à l’air libre (fermés) d'une capacité maximale de 2 000 l, adaptés pour être raccordés à un réseau d'alimentation en eau à une pression comprise entre 0,05 MPa et 1,0 MPa (0,5 bar et 10 bar), et équipés de dispositifs de réglage et de sécurité conçus pour empêcher que la température de l'eau potable stockée n’atteigne 95 °C.
Bien que la présente norme ne s'applique pas aux préparateurs d’eau chaude destinés avant tout au chauffage direct, elle permet la mise à disposition d'éléments de chauffe électrique à usage d’appoint.
Oskrba z vodo - Specifikacija za posredno ogrevane neprezračevane (zaprte) akumulacijske grelnike vode
Ta evropski standard določa konstrukcijske zahteve in zahteve glede zmogljivosti ter preskusne metode za posredno ogrevane neprezračevane (zaprte) akumulacijske grelnike vode za največjo prostornino 2000 l, ki so primerni za priključitev na vir oskrbe z vodo pri tlaku od 0,05 Mpa do 1,0 Mpa (0,5 in 10 bara) ter opremljeni z nadzornimi in varnostnimi napravami, ki preprečujejo, da bi temperatura pitne vode v grelniku dosegla 100 °C.
Ta standard ne zajema grelnikov vode, ki so namenjeni predvsem za neposredno ogrevanje, vendar dovoljuje uporabo dodatnih električnih grelnih elementov.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene) Speicher-WassererwärmerAlimentation en eau - Prescriptions pour réservoirs de stockage d'eau chaude à chauffage indirect sans mise à l'air libre (fermés)Water supply - Specification for indirectly heated unvented (closed) storage water heaters91.140.65Oprema za ogrevanje vodeWater heating equipmentICS:Ta slovenski standard je istoveten z:EN 12897:2016SIST EN 12897:2016en,fr,de01-september-2016SIST EN 12897:2016SLOVENSKI
STANDARDSIST EN 12897:20061DGRPHãþD
SIST EN 12897:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12897
June
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{ sä s v rä x w Supersedes EN
s t z { yã t r r xEnglish Version
Water supply æ Specification for indirectly heated Alimentation en eau æ Prescriptions pour préparateurs d 5eau chaude par accumulation à chauffage indirect
Wasserversorgung æ Bestimmung für mittelbar Wassererwärmer This European Standard was approved by CEN on
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t r s xä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
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t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t z { yã t r s x ESIST EN 12897:2016
EN 12897:2016 (E) 2 Contents Page European foreword . 4 Introduction . 5 1 Scope . 6 2 Normative references . 6 3 Terms, definitions and symbols . 6 3.1 Terms and definitions . 7 3.2 Symbols . 8 4 Requirements . 8 4.1 Constructional requirements . 8 4.1.1 Inspection access . 8 4.1.2 Draining . 8 4.1.3 Hydraulic connections . 8 4.2 Temperature control . 8 4.3 Mechanical resistance and stability . 9 4.3.1 Pressure resistance of water storage vessel . 9 4.3.2 Pressure resistance of primary heater. 9 4.3.3 Durability . 9 4.3.4 Leakage test on double-walled primary heater . 11 4.4 Safety equipment. 11 4.4.1 General . 11 4.4.2 Energy cut-out device . 11 4.4.3 Temperature relief valve . 11 4.4.4 Pressure relief/expansion valve . 11 4.4.5 Pressure reducing valve . 11 4.4.6 Provision for expansion . 12 4.4.7 Backflow prevention . 12 5 Marking . 12 6 Evaluation of conformity . 12 6.1 General . 12 6.1.1 Compliance testing . 12 6.1.2 Market surveillance . 13 6.2 Initial type testing . 13 6.2.1 General . 13 6.2.2 Actual volume . 13 6.2.3 Rated storage volume . 13 6.2.4 Hot water volume . 13 6.2.5 Primary heating power (heat exchanger performance) . 14 6.2.6 Durability testing . 14 6.2.7 Double-walled primary heaters . 14 6.2.8 Standing heat loss . 14 6.2.9 Pressure resistance . 14 6.2.10 Temperature control devices . 14 6.2.11 Heat exchanger pressure drop . 14 6.3 Production testing . 14 6.4 Factory production control (FPC) . 15 SIST EN 12897:2016
EN 12897:2016 (E) 3 7 Technical documents . 15 7.1 General . 15 7.2 Assembly and maintenance instructions . 15 7.3 Operating instructions . 16 Annex A (normative)
Hot water safety and performance testing . 17 A.1 Tests required . 17 A.2 Test apparatus and tolerances . 17 A.3 Performance tests . 19 A.4 Interpretation and calculation of hot water performance results . 21 A.5 Function of safety devices. 22 Annex B (normative)
Measurement of standing heat loss for factory insulated storage water heaters . 23 B.1 General . 23 B.2 Apparatus . 23 B.3 Test Procedure . 25 B.4 Calculation of Results . 26 Annex C (informative)
Inspection access . 28 Annex ZA (informative)
Relationship between this European Standard and the requirements of Commission Delegated Regulation (EU) No 812/2013 of 18 February 2013 supplementing Directive 2010/30/EU regarding energy labelling for water heaters and hot water storage tanks . 30 Annex ZB (informative)
Relationship between this European Standard and the requirements of Commission Regulation (EU) No 814/2013 of 2 August 2013 implementing Directive 2009/125/EC with regard to Ecodesign requirements for water heaters and hot water storage tanks . 31 Bibliography . 32
SIST EN 12897:2016
EN 12897:2016 (E) 4 European foreword This document (EN 12897:2016) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. 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 December 2016, and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12897:2006. 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 Commission Delegated Regulation (EU) No 812/2013 and Commission Regulation (EU) No 814/2013. For relationship with EU Directives, see informative Annexes ZA and ZB which are an integral part of this document. In comparison with EN 12897:2006, the following significant changes have been made: — the capacity range extended from 1 000 l to 2 000 l; — the maximum temperature reduced from 100 °C to 95 °C; — revisions in durability testing for cylinders using expansion vessels or internal expansion space; — provision is made in Annex A for the calculation of the V40 hot water capacity; — Annex B has been revised to improve the test methodology and bring the standing heat loss test requirements in line with those required by the EU directives for the Ecodesign and labelling of hot water storage tanks. According to the CEN/CENELEC Internal Regulations, the national standards organizations 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 12897:2016
EN 12897:2016 (E) 5 Introduction In respect of potential adverse effects on the quality of water intended for human consumption caused by the product covered by this standard: a) This standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA. b) It should be noted that, while awaiting the adoption of the verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. SIST EN 12897:2016
EN 12897:2016 (E) 6 1 Scope This European Standard specifies the constructional and performance requirements and methods of test for indirectly heated, unvented (closed) storage water heaters of up to 2 000 l volume suitable for connection to a water supply at a pressure between 0,05 MPa and 1,0 MPa (0,5 bar and 10 bar), and fitted with control and safety devices designed to prevent the temperature of the stored drinking water from reaching 95 °C. Whilst storage water heaters intended primarily for direct heating are not covered by this standard, it does allow the provision of electric heating elements for auxiliary use. 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 1487, Building valves — Hydraulic safety groups — Tests and requirements EN 1488, Building valves — Expansion groups — Tests and requirements EN 1489, Building valves — Pressure safety valves — Tests and requirements EN 1490, Building valves — Combined temperature and pressure relief valves — Tests and requirements EN 1491, Building valves — Expansion valves — Tests and requirements EN 1567, Building valves — Water pressure reducing valves and combination water pressure reducing valves — Requirements and tests EN 1717, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow EN 13203 (all parts), Gas-fired domestic appliances producing hot water EN 13959, Anti-pollution check valves — DN 6 to DN 250 inclusive family E, type A, B, C and D EN 15332:2007, Heating boilers — Energy assessment of hot water storage systems EN 60379:2004, Methods for measuring the performance of electric storage water-heaters for household purposes (IEC 60379:1987) EN 60730-2-9, Automatic electrical controls for household and similar use — Part 2-9: Particular requirements for temperature sensing controls (IEC 60730-2-9) 3 Terms, definitions and symbols For the purposes of this document, the following terms, definitions and symbols apply. SIST EN 12897:2016
EN 12897:2016 (E) 7 3.1 Terms and definitions 3.1.1 indirectly heated unvented (closed) storage water heater vessel complete with heat exchanger (primary heater) for heating and storage of drinking water where the contents are not vented to atmosphere 3.1.2 rated volume rated storage volume
V volume of the water storage vessel in litres as specified in the manual 3.1.3 actual volume measured volume of the drinking water storage vessel in litres 3.1.4 water side part of the storage water heater directly in contact with the drinking water 3.1.5 heating side parts of the storage water heater which contain the heating medium 3.1.6 maximum design pressure rated pressure maximum pressure to which the unvented storage water heater is designed to be subjected in use 3.1.7 maximum inlet pressure specified maximum cold water inlet pressure for the water heater 3.1.8 maximum safety temperature maximum temperature that the stored water can reach under a fault condition 3.1.9 maximum operating temperature maximum temperature that can be set for normal operation 3.1.10 primary heater heat exchanger system fitted to the hot water storage vessel through which a heating medium (such as water from a boiler) flows to heat the stored drinking water 3.1.11 double-walled primary heater primary heater with concentric walls such that any leak through one wall will not allow the heating fluid to contaminate the drinking water SIST EN 12897:2016
EN 12897:2016 (E) 8 3.2 Symbols Symbol Unit Description ´p [ °C ] Average temperature of the water drawn off at
· (c + 30) °C V40 [l] Mixed water quantity delivered at 40 °C. c [ °C ] Average temperature of inlet cold water during the test set [ °C ] Target hot water temperature for hot water performance testing = c + 50 K pri [ °C ] Primary flow temperature = c + 70 K w [ °C ] Target temperature of stored water for heat loss testing e [ °C ] Mean of all the differentials between w and measured ambient air temperature a [ °C ] Measured ambient temperature at a given position Vhot [ l ] Volume of water drawn off at
· (c + 30)°C Qc [ kWh/24h ] Corrected 24 h heat loss Qst [ kWh/24h or W ] Declared standing heat loss Qm [ kWh ] Power consumption meter reading t [ minutes ] Time taken to reheat the storage water heater from c to set P [ kW ] Calculated heat exchanger performance 4 Requirements 4.1 Constructional requirements 4.1.1 Inspection access Unvented storage water heaters shall be provided with means for internal inspection (see Annex C). This can also be achieved by using a connection intended and dimensioned for another purpose where the use of a suitable inspection instrument such as an endoscope is acceptable. 4.1.2 Draining Unvented storage water heaters shall permit in situ draining. The method of draining shall be given in the manufacturer's instructions. 4.1.3 Hydraulic connections Hydraulic connections shall be of a type that allows the storage water heater to be disconnected from the pipework. 4.2 Temperature control The temperature of the stored drinking water shall be regulated either by control of the heat source or sources or by control of the water heater. SIST EN 12897:2016
EN 12897:2016 (E) 9 4.3 Mechanical resistance and stability 4.3.1 Pressure resistance of water storage vessel When tested in accordance with 6.2, the water heater shall withstand a pressure of 2,0 times the maximum design pressure (as specified by the manufacturer) for a period of not less than 10 min without showing any leakage or cracking. 4.3.2 Pressure resistance of primary heater When tested in accordance with 6.2, the primary heater or heaters shall withstand a pressure of 2,0 times the maximum design pressure, as specified by the manufacturer, for a period of not less than 10 min without showing any leakage or cracking. 4.3.3 Durability 4.3.3.1 General Water heaters shall be tested for durability by pressure cycle testing to either 4.3.3.2 or 4.3.3.3 as appropriate. See Figure 2 for details. The storage water heater shall show no signs of leakage or cracking after testing. For water heaters without inlet pressure and system expansion control and where the internal pressure is likely to reach maximum design pressure due to water expansion after heat input, the test in 4.3.3.2 shall be applied. For water heaters designed for use with expansion vessels or internal expansion space such that the rise in internal pressure due to expansion is controlled to below maximum design pressure, then the alternative 4.3.3.3 shall be used. If 4.3.3.3 is used then the installation manual supplied with the water heater shall specify the pressure reduction and expansion control devices required. 4.3.3.2 Water heaters without inlet pressure and system expansion control The water heater shall be subjected to either 20 000 periodic cycles at 1,2 × maximum design pressure or 100 000 periodic cycles at 1,0 × maximum design pressure. 4.3.3.3 Water heaters designed for use with expansion vessels or internal expansion space For water heaters supplied for use with inlet pressure controls and expansion control systems and these control systems are supplied with the water heater then the water heater shall be subjected to either 20 000 periodic cycles at 1,5 × maximum inlet pressure or 100 000 periodic cycles at 1,3 × maximum inlet pressure. This procedure is illustrated by Figure 1. SIST EN 12897:2016
EN 12897:2016 (E) 10
Key Y pressure X time Figure 1 — Diagram of test pressure cycle variations T1
·
s w s
¶
u r s T2
·
s w s
¶
t r s T3
·
v w s
¶
x r s P1 = Minimum inlet pressure as defined in the technical documents or 0,1 MPa (1 bar) whichever is the lower value. P2 = Test pressure as defined in 4.3.3.2 or 4.3.3.3 as appropriate.
Key 1 optional inlet pressure control with expansion valve (4.3.3.2) 2 mandatory inlet pressure control with external expansion vessel (4.3.3.3) 3 mandatory inlet pressure control with internal expansion space (4.3.3.3) Figure 2 — Pressure control options SIST EN 12897:2016
EN 12897:2016 (E) 11 4.3.4 Leakage test on double-walled primary heater When a water heater is provided with a double-walled primary heater, it shall be constructed such that any leakage from the heating side shall be routed to outside the heat exchanger without coming into contact with the stored drinking water. 4.4 Safety equipment 4.4.1 General Control and safety devices shall operate in the following sequence: 1) thermostatic control device; 2) energy cut out device; 3) where required, temperature pressure relief valve or safety relief valve. Water heaters shall, where required, either be factory fitted, supplied with or fitted in accordance with the manufacturer's instructions with all devices necessary for the operation of the water heater and the prevention of contamination of the drinking water supply. All tests, unless specified within the test method, shall be carried out with all devices necessary to control the temperature of the water and all devices necessary for the operation of the water heater and the prevention of contamination of the drinking water supply, fitted. 4.4.2 Energy cut-out device Where required, water heaters shall be fitted with one or more non-self-resetting energy cut-outs conforming to EN 60730-2-9 connected to the heat source to ensure that the heat input is interrupted in the event of failure of the control thermostat and before the temperature of the stored water reaches 95 °C. 4.4.3 Temperature relief valve Where required, a temperature relief or a temperature and pressure relief valve shall conform to EN 1490 and be positioned in the water heater so that it prevents the temperature of the stored water from exceeding 100 °C. 4.4.4 Pressure relief/expansion valve Where required, water heaters shall be fitted, on the cold-water inlet, with either: a)
an expansion valve conforming to EN 1491, b)
an expansion group conforming to EN 1488, c)
a pressure safety valve conforming to EN 1489, or d)
a hydraulic safety group conforming to EN 1487. 4.4.5 Pressure reducing valve Where required, a pressure reducing valve conforming to EN 1567 shall be used. SIST EN 12897:2016
EN 12897:2016 (E) 12 4.4.6 Provision for expansion Where it is a local requirement that expansion water is contained within the hot water system, water heaters shall either: a) have an expansion capability within the storage vessel, or b) be supplied with, or fitted in accordance with the manufacturer's instructions with an expansion vessel. 4.4.7 Backflow prevention Where required, a protective device against backflow conforming to EN 1717 shall be used. If non-return valves are used, they shall comply with EN 13959. 5 Marking Water heaters shall be permanently marked, by means of a plate or label to be visible after installation, with, as a minimum, the following information: a) number and year of this standard, EN 12897:2016; b) manufacturer's name, trademark or identification mark; c) manufacturing number or serial number, indicating year of manufacture; d) maximum design pressure on the drinking water side; e) maximum design pressure on the heating side; f) rated storage volume; g) rated volume of the heat exchanger(s); h) standing heat loss in kWh/24h or W. In the case of water heaters that are incorporated into heating boilers, the characteristics of the storage water heater and the heating boiler may be shown on a common rating plate or label. 6 Evaluation of conformity 6.1 General 6.1.1 Compliance testing The compliance of the product with the requirements of this European Standard and with the stated values (including classes) shall be demonstrated by: — initial type testing; and — factory production control by the manufacturer, including product assessment. For the purposes of testing, products may be grouped into families, where it is considered that the selected property is common to all products within that family. SIST EN 12897:2016
EN 12897:2016 (E) 13 6.1.2 Market surveillance Storage water heaters are type tested for compliance purposes by means of a specially manufactured unit without the heat exchanger and with an electric immersion heater fitted as specified in B.1 of this standard. For surveillance check testing of production storage water heaters fitted with heat exchangers, the test may be carried out using either an existing immersion heater or one fitted in an existing connection provided that it meets the positional conditions specified in B.1 and heats at least 85 % of the storage water heater's contents. In the event of any doubt then the results from the special type test unit shall take precedence. 6.2 Initial type testing 6.2.1 General Initial type testing shall be performed to show conformity with this European Standard. Tests previously performed in accordance with the provisions of this European Standard (same product, same characteristic(s), test method, sampling procedure, system of attestation of conformity, etc.) may be taken into account. In addition, initial type testing shall be performed at the beginning of the production of a new product type (unless a member of the same family) or at the beginning of a new method of production (where this may affect the stated properties). Whenever a change occurs in the product design, the raw material or supplier of the components, or the production process (subject to the definition of a family), which would change significantly one or more of the characteristics, the type tests shall be performed for the appropriate characteristic(s). 6.2.2 Actual volume The actual volume shall be determined for each model in a manufacturer’s product range using a suitable measuring or calculation technique with an accuracy of ± 1 %. This may be done by weighing the heater empty and full of water and calculating the volume of the water. Where a water heater has an internal air space
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