1、BRITISH STANDARDBS EN 12897:2006Water supply Specification for indirectly heated unvented (closed) storage water heatersThe European Standard EN 12897:2006 has the status of a British StandardICS 91.140.65g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49
2、g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 12897:2006This British Standard was published under the authority of the Standards Policy and Stra
3、tegy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 52987 0National forewordThis British Standard was published by BSI. It is the UK implementation of EN 12897:2006. It supersedes BS 7206:1990 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/504, Wa
4、ter supply.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer imm
5、unity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12897July 2006ICS 91.140.65English VersionWater supply - Specification fo
6、r indirectly heated unvented(closed) storage water heatersAlimentation en eau - Prescriptions pour rservoirs destockage deau chaude chauffage indirect sans mise lair libre (ferms)Wasserversorgung - Bestimmung fr mittelbar beheizte,unbelftete (geschlossene) Speicher-WassererwrmerThis European Standar
7、d was approved by CEN on 13 April 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such n
8、ationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and no
9、tified to the Central Secretariat has the same status as the officialversions.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, Netherla
10、nds, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any
11、 form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12897:2006: ELicensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 2 Contents Page Foreword4 Introduction .5 1 Scope 6 2 Normative references 6 3 Terms and definitions
12、 .6 4 Requirements.7 4.1 Effect of material on water quality and hygiene of drinking water.7 4.2 Constructional requirements7 4.2.1 Inspection access7 4.2.2 Draining 7 4.3 Temperature control8 4.4 Mechanical resistance and stability.8 4.4.1 Pressure resistance of water storage vessel8 4.4.2 Pressure
13、 resistance of primary heater 8 4.4.3 Durability 8 4.4.4 Leakage test on double-walled primary heater 9 4.5 Safety equipment 10 4.5.1 General. 10 4.5.2 Energy cut-out device 10 4.5.3 Temperature relief valve 10 4.5.4 Pressure relief/expansion valve 10 4.5.5 Pressure reducing valve 10 4.5.6 Provision
14、 for expansion. 10 4.5.7 Backflow prevention. 11 4.6 Temperature display. 11 5 Marking 11 6 Evaluation of conformity 11 6.1 General. 11 6.2 Initial type testing . 12 6.2.1 General. 12 6.2.2 Nominal capacity 12 6.2.3 Hot water capacity 12 6.2.4 Primary Heating Power (heat exchanger performance) 12 6.
15、2.5 Durability testing. 12 6.2.6 Double walled primary heaters 12 6.2.7 Standing heat loss 12 6.2.8 Pressure resistance 12 6.2.9 Temperature control devices. 13 6.2.10 Heat exchanger pressure drop 13 6.3 Production testing 13 6.3.1 General. 13 6.3.2 Pressure resistance 13 6.4 Factory production cont
16、rol (FPC) . 13 7 Technical documents . 14 7.1 General. 14 7.2 Assembly and maintenance instructions. 14 7.3 Operating instructions . 14 Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 3 Annex A (normative) Hot water safety and performance
17、testing 15 A.1 Scope15 A.2 Tests required15 A.3 Test apparatus.15 A.4 Performance tests .17 A.4.1 Hot water performance .17 A.4.2 Primary heater pressure drop 18 A.5 Interpretation of hot water performance results 18 A.5.1 Hot water capacity.18 A.5.2 Reheat performance19 A.6 Temperature or temperatu
18、re pressure relief valve function.19 Annex B (normative) Standing heat loss measurement20 B.1 General .20 B.2 Test apparatus.20 B.3 Test procedure.22 B.4 Calculation of results22 Annex C (informative) Inspection access23 Bibliography25 Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007,
19、 Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 4 Foreword This document (EN 12897:2006) 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 id
20、entical text or by endorsement, at the latest by January 2007, and conflicting national standards shall be withdrawn at the latest by January 2007. NOTE Products intended for use in water supply systems should comply, when existing, with national regulations and testing arrangements that ensure fitn
21、ess for contact with drinking water. The Member states relevant regulators and the EC Commission agreed on the principle of a future unique European Acceptance Scheme (EAS), which would provide a common testing and approval arrangement at European level. If and when the EAS is adopted, European Prod
22、uct Standards will be amended by the addition of an Annex Z/EAS under Mandate M136 which will contain formal references to the testing, certification and product marking requirements of the EAS. Until EAS comes into force, the current national regulations remain applicable. According to the CEN/CENE
23、LEC 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, Malt
24、a, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 5 Introduction In respect of potential adverse effects on the quality of
25、water intended for human consumption caused by the product covered by this standard: 1) 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. 2) It should be noted that, while awaiting the adoption of the verifi
26、able European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 6 1 Scope This European Standard specifies the performance
27、 requirements and methods of test for indirectly heated, unvented (closed) storage water heaters of up to 1000 l capacity 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 operatin
28、g temperature of the stored drinking water from exceeding 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. 2 Normative references The following referenced documents
29、are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1487, Building valves Hydraulic safety groups Tests and requirements EN 1488, Bui
30、lding 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 156
31、7, Building valves - Water pressure reducing valves and combination of 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 60379, Methods for meas
32、uring the performance of electric storage water-heaters for household purposes (IEC 60379:1987, modified) EN 60730-2-9 Automatic electrical controls for household and similar use - Part 2-9: Particular requirements for temperature sensing controls (IEC 60730-2-9:2000, modified) 3 Terms and definitio
33、ns For the purposes of this European Standard, the following terms and definitions apply. 3.1 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 3.2 to
34、tal capacity total capacity of the water storage vessel in litre as specified by the manufacturer Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 7 3.3 actual capacity measured capacity of the drinking water storage vessel in litre 3.4 wat
35、er side part of the storage water heater directly in contact with drinking water 3.5 heat source side parts of the storage water heater which contain the heating medium 3.6 maximum design pressure (rated pressure) maximum pressure to which the unvented storage water heater is subjected in normal use
36、 3.7 operating pressure specified inlet pressure for the water heater 3.8 operating temperature temperature at which the water is stored 3.9 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 stor
37、ed drinking water 3.10 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 4 Requirements 4.1 Effect of material on water quality and hygiene of drinking water All materials used in w
38、ater heaters in contact with drinking water shall fulfil the requirements for Construction Products In Contact With Drinking Water (CPDW). NOTE Until the adoption of the European Assessment Scheme, national regulations concerning the hygiene of drinking water may be applicable. 4.2 Constructional re
39、quirements 4.2.1 Inspection access Unvented storage water heaters shall be provided with means for internal inspection. NOTE This can 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
40、.2.2 Draining Unvented storage water heaters shall permit in-situ draining. The method of draining shall be given in the manufacturers instructions. Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006 (E) 8 4.3 Temperature control The temperature
41、of the stored water shall be regulated either by control of the heat source or sources or by control of the water heater. 4.4 Mechanical resistance and stability 4.4.1 Pressure resistance of water storage vessel All water heaters, when tested in accordance with 6.2.1, shall withstand a pressure of 2
42、,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. 4.4.2 Pressure resistance of primary heater The primary heater (the coil), when tested in accordance with 6.2.1, shall withstand a pressure of 2,0 tim
43、es the maximum design pressure, as specified by the manufacturer, for a period of not less than 10 min without showing any leakage or cracking. 4.4.3 Durability The water heater shall be subjected to either 20,000 periodic cycles at 1,5 x operating pressure or 100 000 periodic cycles at 1,3 x operat
44、ing pressure as shown in Figure 1, there shall be no leakage or visible signs of distress. This test shall be carried our after complete fabrication (and lining) but before insulation is applied. Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 12897:2006
45、 (E) 9 Key T1 15 30s T2 15 20s T3 45 60s P0= Atmospheric pressure P1= 1,5 x operating pressure for 20 000 cycles or 1,3 x operating pressure for 100 000 cycles x Time y Pressure Figure 1 Cycle of pressure variations 4.4.4 Leakage test on double-walled primary heater When a water heater is provided w
46、ith a doubled-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. Licensed Copy: Wang Bin, na, Wed Sep 19 06:25:41 GMT+00:00 2007, Uncontrolled Copy, (c) BS
47、IEN 12897:2006 (E) 10 4.5 Safety equipment 4.5.1 General To prevent the temperature of the drinking water from exceeding 100 C control and safety devices shall operate in the following sequence. i) Thermostatic control device ii) Energy cut out device iii) Where required, temperature pressure relief
48、 valve or safety relief valve Water heaters shall, where required, either be factory fitted, supplied with or fitted in accordance with the manufacturers instructions with all devices necessary for the operation of the water heater and the prevention of contamination of the drinking water supply. Al
49、l tests, unless specified within the test method, are to be carried out with all devices necessary to keep the temperature of the water from exceeding 100 C and all devices necessary for the operation of the water heater and the prevention of contamination of the drinking water supply, fitted. 4.5.2 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
