SIST EN 12897:2006
(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 performance 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 5 Mpa and 100 Mpa (0,5 and 10 bar), and fitted with control and safety devices designed to prevent the operating 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.
Wasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene) SpeicherWassererwärmer
Diese Europäische Norm legt die Leistungsanforderungen an und Prüfverfahren für mittelbar beheizte, unbelüftete (geschlossene) Speicher Wassererwärmer bis zu 1 000 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 ausgerüstet sind, die so ausgelegt sind, dass die Betriebstemperatur des gespeicherten Trinkwassers 100 °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 a chauffage indirect sans mise a l'air libre (fermés)
La présente Norme européenne définit les prescriptions de performance et les méthodes d'essai applicables aux préparateurs d'eau chaude sanitaire non ouverts a l'air libre (chauffe-eau fermés) d'une capacité maximale de 1 000 l destinés a etre raccordés a un réseau d'alimentation en eau a une pression comprise entre 0,05 MPa et 1,0 MPa (0,05 bar a 1,0 bar), équipés des dispositifs de commande et de sécurité conçus pour éviter que la température de l'eau chaude stockée ne dépasse 100 °C.
Bien que la présente norme ne s'applique pas aux ballons a échangeur, celle-ci permet la mise a disposition d'éléments de chauffe électrique a usage auxiliaire.
Oskrba z vodo – Specifikacija za posredno ogrevane neprezračevane (zaprte) akumulacijske grelnike vode
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Water supply - Specification for indirectly heated unvented (closed) storage water heatersAlimentation en eau - Prescriptions pour réservoirs de stockage d'eau chaude a chauffage indirect sans mise a l'air libre (fermés)Wasserversorgung - Bestimmung für mittelbar beheizte, unbelüftete (geschlossene) SpeicherWassererwärmerTa slovenski standard je istoveten z:EN 12897:2006SIST EN 12897:2006en91.140.65Oprema za ogrevanje vodeWater heating equipmentICS:SLOVENSKI
STANDARDSIST EN 12897:200601-oktober-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12897July 2006ICS 91.140.65 English VersionWater supply - Specification for indirectly heated unvented(closed) storage water heatersAlimentation en eau - Prescriptions pour réservoirs destockage d'eau chaude à chauffage indirect sans mise àl'air libre (fermés)Wasserversorgung - Bestimmung für mittelbar beheizte,unbelüftete (geschlossene) SpeicherWassererwärmerThis European Standard 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 nationalstandards 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 notified 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, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12897:2006: E
EN 12897:2006 (E) 2 Contents Page Foreword.4 Introduction.5 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 4 Requirements.7 4.1 Effect of material on water quality and hygiene of drinking water.7 4.2 Constructional requirements.7 4.2.1 Inspection access.7 4.2.2 Draining.7 4.3 Temperature control.8 4.4 Mechanical resistance and stability.8 4.4.1 Pressure resistance of water storage vessel.8 4.4.2 Pressure 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 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 6.2.5 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 control (FPC).13 7 Technical documents.14 7.1 General.14 7.2 Assembly and maintenance instructions.14 7.3 Operating instructions.14
EN 12897:2006 (E) 3 Annex A (normative) Hot water safety and performance testing.15 A.1 Scope.15 A.2 Tests required.15 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 performance.19 A.6 Temperature or temperature pressure relief valve function.19 Annex B (normative)
Standing heat loss measurement.20 B.1 General.20 B.2 Test apparatus.20 B.3 Test procedure.22 B.4 Calculation of results.22 Annex C (informative) Inspection access.23 Bibliography.25
EN 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 identical 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 fitness 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 Product 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/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.
EN 12897:2006 (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: 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 verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force.
EN 12897:2006 (E) 6
1 Scope This European Standard specifies the performance 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 operating 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 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, 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 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 measuring 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 definitions 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 total capacity total capacity of the water storage vessel in litre as specified by the manufacturer
EN 12897:2006 (E) 7 3.3 actual capacity measured capacity of the drinking water storage vessel in litre 3.4 water 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 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 stored 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 water 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 requirements 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. 4.2.2 Draining Unvented storage water heaters shall permit in-situ draining.
The method of draining shall be given in the manufacturer's instructions.
EN 12897:2006 (E) 8 4.3 Temperature control The temperature 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 2,0 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 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. 4.4.3 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 operating 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.
EN 12897:2006 (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 with 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.
EN 12897:2006 (E) 10 4.5 Safety equipment 4.5.1 General To prevent the temperature of the drinking water from exceeding 100 ºC 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 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, 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 control thermostat and before the temperature of the stored water reaches 100 °C. 4.5.3 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. 4.5.4 Pressure relief/expansion valve Where required, water heaters shall be fitted, on the cold-water inlet, with either; i) an expansion valve conforming to EN 1491, ii) an expansion group conforming to EN 1488,
iii) a pressure safety valve conforming to EN 1489 or, iv) a hydraulic safety group conforming to EN 1487. 4.5.5 Pressure reducing valve Where required, a pressure reducing valve conforming to EN 1567 shall be used. 4.5.6 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
EN 12897:2006 (E) 11 b) be supplied with, or fitted in accordance with the manufacturer's instructions with an expansion vessel 4.5.7 Backflow prevention Where required, check valves conforming to EN 1717 shall be used. 4.6 Temperature display Where required, the water heater shall have a means of displaying the temperature of the drinking water. 5 Marking Water heaters shall be permanently marked, by means of a plate or label to be visible after installation, with the following information: a) number and year of this standard, EN 12897:2006; b) manufacturer's name, trademark or identification mark; c) manufacturing number or serial number, indicating year of manufacture; d) operating pressure, on the drinking water side and on the heat source side; e) maximum design pressure; f) primary heating power input in kW; g) primary flowrate to achieve the stated primary heating power specified in 5f; h) actual capacity; i) standing heat loss in kWh/24 h. NOTE 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 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; 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.
EN 12897:2006 (E) 12 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 Nominal capacity The nominal capacity shall be determined for each model in a manufacturer’s product range using a suitable measuring device with an accuracy of ± 1 %. Where a water heater has an internal air space, this test shall be done with the cylinder at normal operating pressure i.e. the set pressure of the pressure-reducing valve. 6.2.3 Hot water capacity The hot water capacity shall be determined for each model in a manufacturers product range. This shall be done following the procedure described in A.4.2 to A.5.1. 6.2.4 Primary Heating Power (heat exchanger performance) The primary heating power (heat exchanger performance) shall be determined for each model in a manufacturer’s product range. This is not required if the vessel is to be integrated into another appliance for which the prEN 13203 tests are separately required. This shall be performed following the procedure given in A.4.2 to A.5.2. 6.2.5 Durability testing The mechanical resistance and stability of the vessel shall be tested in accordance with 4.4.3. 6.2.6 Double-walled primary heaters When a water heater is provided with a double-walled primary heater, drill a (2 ± 0,1) mm hole through the partition wall in contact with the heating side at the most critical location in the primary heater (normally the furthest point from the connections). Fill the primary heater and subject it to a water-pressure of (50 ± 5) kPa. Maintain that pressure for (300 ± 5) s. Water shall emerge to atmosphere from the water heater. 6.2.7 Standing heat loss The standing heat loss shall be determined in accordance with the procedure given in either Annex B or EN 60379. 6.2.8 Pressure resistance
This test shall be performed on a sample taken from production after lining (where required) but before insulation.
Connections may be fitted with temporary sealing arrangements.
For tank-in-tank water heaters
EN 12897:2006 (E) 13 the water side shall be filled to the heat source side operating pressure before conducting the test on the heat source side. Raise the internal pressure to 2,0 times the maximum design pressure specified by the manufacturer and maintain the pressure for (600 ± 5) s. There shall be no leakage or cracking of the shell. 6.2.9 Temperature control devices If the water heater is supplied with a temperature control device it shall be tested in accordance with the procedure in Annex A.
6.2.10 Heat exchanger pressure drop The heat exchanger pressure drop shall be tested in accordance with the procedure in Annex A. 6.3 Production testing 6.3.1 General All water heaters shall be tested in accordance with 6.3.2. 6.3.2 Pressure resistance Following complete fabrication, but before lining for corrosion protection and application of insulation, each water heater shall be capable of meeting the following test requirement. Raise the internal pressure to 1,3 times the operating pressure specified by the manufacturer. Any leakage, or cracking shall be deemed a failure and require remedial action or rejection. Pneumatic testing with air or an inert gas (e.g. helium) is possible. In this case the minimum pressure is 3,5 bar, with a maximum of 1,1 times maximum working pressure. Every 250th water heater from production shall be tested with water as described above. WARNING
The pneumatic testing of unvented storage water heaters is potentially dangerous, therefore, such test equipment requires careful consideration.
6.4 Factory production control (FPC) The manufacturer shall establish, document and maintain an FPC system to ensure that the products placed on the market conform to the stated performance characteristics. The FPC system shall consist of procedures, regular inspections and tests and/or assessments and the use of the results to control raw and other incoming materials or components, equipment, the production process and the product. An FPC system conforming to the requirements of EN ISO 9001, and made specific to the requirements of this document, is considered to satisfy the above requirements. The results of inspections, tests or assessments requiring action shall be recorded, as shall any action taken. The action to be taken when control values or criteria are not met shall be recorded.
EN 12897:2006 (E) 14 7 Technical documents 7.1 General Each water heater shall be supplied with a set of assembly instructions along with operating and service recommendations, including maintenance instructions. 7.2 Assembly and maintenance instructions The assembly instructions shall include, as a minimum, the following information: a) technical data, including: maximum operating pressure (rated pressure) of the primary and the secondary system in Pa or bar; maximum operating temperature of the heating fluid in °C; type of corrosion protection and maintenance; nominal capacity of the water heater; location and nominal diameter of all connections; accommodation of expansion water; pressure drop through the primary heater; primary flow rate information; diagram showing position of devices, drain tap, etc. b) installation instructions with recommendations on mounting surfaces, distance from walls and protection with regard to frost; c) method for external pipework connection;
d) type and size of safety devices and drain tap; e) necessary temperature control devices
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