1、BS EN 12897:2016Water supply Specificationfor indirectly heated unvented(closed) storage water heatersBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 12897:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12897:2016 .It
2、 supersedes BS EN 12897:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/504/-/10, Hot the maximum temperature reduced from 100 C to 95 C; revisions in durability testing for cylinders using expansion vessels or internal expansion space; provision
3、 is made in Annex A for the calculation of the V40hot 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
4、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,
5、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12897:2016EN 12897:2016 (E) 5 Introduction In respect of potential adverse effects on the qual
6、ity 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
7、 verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. BS EN 12897:2016EN 12897:2016 (E) 6 1 Scope This European Standard specifies the constructional and performance requirements and methods of test for indirectly
8、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
9、 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
10、 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 Exp
11、ansion 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
12、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 produc
13、ing 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 6
14、0379:1987) 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. BS EN 12897:
15、2016EN 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 vo
16、lume 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
17、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
18、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 fr
19、om 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 BS EN 12897:2016EN 12897:2016 (E) 8 3.2 Symbols Symbol Unit Description
20、 p C Average temperature of the water drawn off at (c+ 30) C V40l 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 tem
21、perature of stored water for heat loss testing e C Mean of all the differentials between wand 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
22、 loss Qm kWh Power consumption meter reading t minutes Time taken to reheat the storage water heater from c tosetP 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
23、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 drai
24、ning shall be given in the manufacturers 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 con
25、trol of the heat source or sources or by control of the water heater. BS EN 12897:2016EN 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
26、 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 p
27、ressure, 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
28、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 applie
29、d. 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
30、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,
31、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
32、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. BS EN 12897:2016EN 12897:2016 (E) 10 Key Y pressure X time Figure 1 Diagram of test pressure cycle variations T1 15 s 30 s
33、T2 15 s 20 s T3 45 s 60 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 pressu
34、re 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 BS EN 12897:2016EN 12897:2016 (E) 11 4.3.4 Leakage test on double-walled primary heater When a water heater is provided with a double-walle
35、d 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) th
36、ermostatic 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 manufacturers instructions with all devices necessary for th
37、e 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 heate
38、r 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 interrupt
39、ed 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 p
40、revents 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
41、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. BS EN 12897:2016EN 12897:2016 (E) 12 4.4.6 Provision for expansion Where it is a local requirement that expa
42、nsion 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 manufacturers instructions with an expansion vessel. 4.4.7 Backflow prevention Where required, a prote
43、ctive 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) num
44、ber and year of this standard, EN 12897:2016; b) manufacturers 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 vol
45、ume; 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 confor
46、mity 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
47、 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. BS EN 12897:2016EN 12897:2016 (E) 13 6.1.2 Market surveillance Storage water heaters are type tested for compliance purposes by means of a
48、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 hea
49、ter 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 heaters 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 pro
