Thermal solar systems and components - Factory made systems - Part 1: General requirements

This European Standard specifies requirements on durability, reliability and safety for Factory Made solar heating systems. The standard also includes provisions for evaluation of conformity to these requirements.
The requirements in this standard apply to Factory Made solar systems as products. The installation of these systems itself is not considered, but requirements are given for the documentation for the installer and the user which is delivered with the system (see also 4.6).
External auxiliary water heating devices that are placed in series with the Factory Made system are not considered to be part of the system. Cold water piping from the cold water grid to the system as well as piping from the system to an external auxiliary heater or to draw-off points is not considered to be part of the system. Piping between components of the Factory Made system is considered to be part of the system. Any integrated heat exchanger or piping for space heating option (see Introduction, Note 3) is not considered to be part of the system.

Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 1: Allgemeine Anforderungen

Diese Europäische Norm legt Anforderungen hinsichtlich Dauerhaftigkeit, Zuverlässigkeit und Sicherheit für vorgefertigte Solaranlagen fest. Die Norm enthält auch Vorgaben für die Bewertung der Konformität mit diesen Anforderungen.
Die Anforderungen in dieser Norm gelten für vorgefertigte Solaranlagen als Produkte. Der Einbau dieser Anlagen wird nicht berücksichtigt, es sind jedoch Anforderungen hinsichtlich der Dokumentation, die mit diesen Anlagen geliefert wird, für den Installateur und für den Anwender angegeben (siehe auch 4.6).
Externe zusätzliche Heizeinrichtungen zur Wassererwärmung, die in Reihenschaltung mit der vorgefertigten Anlage angeordnet sind, werden nicht als Bestandteil der Anlage betrachtet. Kaltwasserleitungen, die vom Kaltwasserversorgungsnetz zur Anlage führen, sowie Leitungen von der Anlage zu einer äußeren Zusatzwärmequelle oder zu Zapfstellen werden nicht als Teil der Anlage betrachtet. Die Verrohrung zwischen den Bauteilen der vorgefertigten Anlage wird als Teil der Anlage betrachtet. Ein möglicherweise vorhandener Wärmetauscher oder eine Verrohrung für die Option der Raumheizung (siehe Einleitung, Anmerkung 3) wird nicht als Teil der Anlage betrachtet.

Installations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 1: Exigences générales

La présente Norme européenne spécifie les exigences de durabilité, de fiabilité et de sécurité requises des installations de chauffage solaire préfabriquées en usine. Elle contient également des dispositions relatives à l’évaluation de la conformité à ces exigences.
Les exigences de la présente Norme s’appliquent aux installations solaires préfabriquées en usine en tant que produits. Leur montage n’est pas pris en considération, mais des exigences relatives à la documentation fournie avec l’installation et à destination de l’installateur et de l’utilisateur sont indiquées (voir également 4.6).
Les dispositifs externes de chauffage d’appoint pour la production d’eau chaude qui sont placés en série avec l’installation préfabriquée en usine ne sont pas considérés comme faisant partie de l’installation. Les canalisations d’eau froide entre le réseau d’eau froide et l’installation ainsi que les canalisations entre l’installation et le dispositif externe de chauffage d’appoint ou les points de soutirage ne sont pas considérées comme faisant partie de l’installation. Les canalisations entre les composants de l’installation préfabriquée en usine sont considérées comme faisant partie de l’installation. Tout échangeur de chaleur ou canalisation intégré(e), destiné(e) à l’option mode chauffage (voir Introduction, Note 3) n’est pas considéré(e) comme faisant partie de l’installation.

Toplotni sončni sistemi in sestavni deli - Industrijsko izdelani sistemi - 1. del: Splošne zahteve

Ta evropski standard določa zahteve za trajnost, zanesljivost in varnost industrijsko izdelanih sončnih ogrevalnih sistemov. Standard vključuje tudi določbe za ocenjevanje skladnosti s temi zahtevami.
Zahteve tega standarda se uporabljajo za tovarniško izdelane sončne sisteme kot izdelke. Sama montaža teh sistemov ni obravnavana, vendar so podane zahteve glede dokumentacije za monterja in uporabnika, ki je priložena sistemu (glej tudi 4.6).
Zunanje pomožne naprave za segrevanje vode, ki so nameščene zaporedno v industrijsko izdelanem sistemu, se ne štejejo za del sistema. Cevi za hladno vodo iz omrežja hladne vode do sistema in cevi iz sistema do zunanjega pomožnega grelca ali do izpustnih točk se ne štejejo za del sistema. Cevi med sestavnimi deli industrijsko izdelanega sistema se štejejo za del sistema. Morebitni vgrajeni izmenjevalnik toplote ali cevi za ogrevanje prostora (glej Uvod, Opomba 3) se ne štejejo za del sistema.

General Information

Status
Withdrawn
Public Enquiry End Date
19-Aug-2014
Publication Date
27-Feb-2017
Withdrawal Date
24-Jan-2022
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
20-Jan-2022
Due Date
12-Feb-2022
Completion Date
25-Jan-2022

RELATIONS

Buy Standard

Standard
SIST EN 12976-1:2017
English language
33 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 1: Allgemeine AnforderungenInstallations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 1: Exigences généralesThermal solar systems and components - Factory made systems - Part 1: General requirements27.160Solar energy engineeringICS:Ta slovenski standard je istoveten z:EN 12976-1:2017SIST EN 12976-1:2017en,fr,de01-april-2017SIST EN 12976-1:2017SLOVENSKI

STANDARDSIST EN 12976-1:20061DGRPHãþD
SIST EN 12976-1:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12976-1
January
t r s y ICS
t yä s x r Supersedes EN
s t { y xæ sã t r r xEnglish Version
Thermal solar systems and components æ Factory made systems æ Part

sã General requirements Installations solaires thermiques et leurs composants æInstallations préfabriquées en usine æ Partie

s ã Exigences générales
Thermische Solaranlagen und ihre Bauteile æ Vorgefertigte Anlagen æ Teil
sã Allgemeine Anforderungen This European Standard was approved by CEN on
s w April
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 Serbiaá 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

t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s t { y xæ sã t r s y ESIST EN 12976-1:2017

EN 12976-1:2017 (E) 2 Contents Page European foreword ...................................................................................................................................................... 4 Introduction .................................................................................................................................................................... 5 1 Scope .................................................................................................................................................................... 7 2 Normative references .................................................................................................................................... 7 3 Terms and definitions ................................................................................................................................... 8 4 Requirements ................................................................................................................................................... 9 4.1 General................................................................................................................................................................ 9 4.1.1 Safety ................................................................................................................................................................... 9 4.1.2 Suitability for drinking water..................................................................................................................... 9 4.1.3 Water contamination .................................................................................................................................... 9 4.1.4 Testing of resistance towards mechanical load ................................................................................... 9 4.1.5 Freeze resistance ............................................................................................................................................ 9 4.1.6 Over temperature protection ................................................................................................................... 10 4.1.7 Reverse flow protection ............................................................................................................................. 11 4.1.8 Pressure resistance ...................................................................................................................................... 11 4.1.9 Electrical safety ............................................................................................................................................. 11 4.2 Materials .......................................................................................................................................................... 11 4.3 Components and pipework ....................................................................................................................... 12 4.3.1 Collector ........................................................................................................................................................... 12 4.3.2 Supporting frame .......................................................................................................................................... 12 4.3.3 Piping ................................................................................................................................................................ 12 4.3.4 Heat Exchangers ............................................................................................................................................ 13 4.3.5 Control system ............................................................................................................................................... 13 4.4 Safety equipment .......................................................................................................................................... 13 4.4.1 Safety valves.................................................................................................................................................... 13 4.4.2 Safety lines and expansion lines .............................................................................................................. 13 4.4.3 Blow-off lines .................................................................................................................................................. 13 4.4.4 Expansion vessels ......................................................................................................................................... 13 4.5 Resistance to external influences ........................................................................................................... 14 4.6 Documentation .............................................................................................................................................. 14 4.6.1 General.............................................................................................................................................................. 14 4.6.2 Documents for the installer ...................................................................................................................... 14 4.6.3 Documents for the user .............................................................................................................................. 17 4.7 Energy Labelling ............................................................................................................................................ 18 4.8 System performance .................................................................................................................................... 19 Annex A (informative)

Conformity assessment ................................................................................................ 20 Annex B (informative)

Material combination with regard to corrosion ................................................. 21 Annex C (normative)

System families................................................................................................................... 24 C.1 System family, system subtype ................................................................................................................ 24 C.2 Requirements for grouping different system configurations into one system family......... 24 C.3 Testing requirements .................................................................................................................................. 27 C.4 Procedure ........................................................................................................................................................ 28 C.4.1 General.............................................................................................................................................................. 28 C.4.2 Evaluation of the validity of the test result.......................................................................................... 29 SIST EN 12976-1:2017

EN 12976-1:2017 (E) 3 C.4.3 Determination of the system parameters ............................................................................................ 30 C.4.4 Calculation of annual performance ........................................................................................................ 32 Bibliography ................................................................................................................................................................. 33

Tables Table 1 — Division for factory made and custom built solar heating systems ....................................... 6 Table A.1 — Guidelines for repetition of tests in case that components have been changed ......... 20 Table B.1 — Material/fluid combination for closed systems ...................................................................... 21 Table B.2 — Material/fluid combination for closed systems ...................................................................... 22 Table B.3 — Material combinations for open systems (related to internal surfaces) ....................... 23 Table B.4 — Material combinations for open systems (related to internal surfaces) ....................... 23

Figures Figure C.1 — Principle of method II (DST) ......................................................................................................... 29

SIST EN 12976-1:2017

EN 12976-1:2017 (E) 4 European foreword This document (EN 12976-1:2017) has been prepared by Technical Committee CEN/TC 312 “Thermal solar systems and components”, the secretariat of which is held by ELOT. 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 July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. 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 12976-1:2006. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. Most significant changes in EN 12976-1:2017 and EN 12976-2:2017 since the 2006 editions of both parts: The first edition of the EN 12976 series was published in 2000. The standard series provided an important basis for the assessment of the performance as well as the reliability and durability of Factory made solar thermal systems. In the past 15 years or so, several important technological developments and changes of the framework conditions, such as e.g. the aspect of requiring “Energy Labelling”, the EN 12976 series underwent several important changes. The following modifications are the most important ones that have been implemented in this new edition of EN 12976-1: — safety valves: new requirement that safety valves shall conform with EN 1489; — resistance to external influences: consideration that the solar components can impact on the performance and durability of essential building elements, e.g. roofs and facades; — labelling: harmonisation with ErP; — Annex C (new): definition of system families; possible range of variations within one system type. EN 12976, Thermal solar systems and components — Factory made systems, is currently composed with the following parts: — Part 1: General requirements; — Part 2: Test methods. According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12976-1:2017

EN 12976-1:2017 (E) 5 Introduction Drinking water quality: 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 verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. Factory Made and Custom Built solar heating systems: The standards EN 12976-1, EN 12976-2, EN 12977-1, EN 12977-2, EN 12977-3, EN 12977-4 and EN 12977-5 distinguish two categories of solar heating systems: Factory Made solar heating systems and Custom Built solar heating systems. The classification of a system as Factory Made or Custom Built is a choice of the final supplier, in accordance with the following definitions. Factory Made solar heating systems are batch products with one trade name, sold as complete and ready to install kits, with fixed configurations. Systems of this category are considered as a single product and assessed as a whole. If a Factory Made Solar Heating System is modified by changing its configuration or by changing one or more of its components, the modified system is considered as a new system for which a new test report is necessary. Requirements and test methods for Factory Made solar heating systems are given in EN 12976-1 and EN 12976-2. Custom Built solar heating systems are either uniquely built, or assembled by choosing from an assortment of components. Systems of this category are regarded as a set of components. The components are separately tested and test results are integrated to an assessment of the whole system. Requirements for Custom Built solar heating systems are given in EN 12977-1; test methods are specified in EN 12977-2, EN 12977-3, EN 12977-4 and EN 12977-5. Custom Built solar heating systems are subdivided into two categories: — Large Custom Built systems are uniquely designed for a specific situation. In general HVAC engineers, manufacturers or other experts design them. — Small Custom Built systems offered by a company are described in a so-called assortment file, in which all components and possible system configurations, marketed by the company, are specified. Each possible combination of a system configuration with components from the assortment is considered as one Custom Built system. SIST EN 12976-1:2017

EN 12976-1:2017 (E) 6 Table 1 shows the division for different system types: Table 1 — Division for factory made and custom built solar heating systems Factory Made Solar Heating Systems (EN 12976–1 and EN 12976–2) Custom Built Solar Heating Systems (EN 12977–1, EN 12977–2 and EN 12977–3) Integrated collector storage systems for domestic hot water preparation Forced-circulation systems for hot water preparation and/or space heating, assembled using components and configurations described in an assortment file (mostly small systems) Thermosiphon systems for domestic hot water preparation Forced-circulation systems as batch product with fixed configuration for domestic hot water preparation Uniquely designed and assembled systems for hot water preparation and/or space heating (mostly large systems)

NOTE Forced circulation systems can be classified either as Factory Made or as Custom Built, depending on the market approach chosen by the final supplier. Both Factory Made and Custom Built systems are performance tested under the same set of reference conditions as specified in EN 12976–2:2017, Annex B, and in EN 12977–2:2012, Annex A. In practice, the installation conditions may differ from these reference conditions. A Factory Made system for domestic hot water preparation may have an option for space heating, however this option should not be used or considered during testing as a Factory Made system. SIST EN 12976-1:2017

EN 12976-1:2017 (E) 7 1 Scope This European Standard specifies requirements on durability, reliability and safety for Factory Made solar heating systems. The standard also includes provisions for evaluation of conformity to these requirements. Concept of system families is included, as well. The requirements in this standard apply to Factory Made solar systems as products. The installation of these systems including their integration with roofs or facades is not considered, but requirements are given for the documentation for the installer and the user to be delivered with the system (see also 4.6). External auxiliary water heating devices that are placed in series with the Factory Made system are not considered to be part of the system. Cold water piping from the cold water grid to the system as well as piping from the system to an external auxiliary heater or to draw-off points is not considered to be part of the system. Piping between components of the Factory Made system is considered to be part of the system. Any integrated heat exchanger or piping for space heating option (see Introduction, last paragraph) is not considered to be part of the system. 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 806-1, Specifications for installations inside buildings conveying water for human consumption — Part 1: General EN 806-2, Specification for installations inside buildings conveying water for human consumption — Part 2: Design EN 809, Pumps and pump units for liquids — Common safety requirements EN 1151 (all parts), Pumps — Rotodynamic pumps — Circulation pumps having a rated power input not exceeding 200 W for heating installations and domestic hot water installations EN 1489, Building valves — Pressure safety valves — Tests and requirements EN 1490, Building valves — Combined temperature and pressure relief valves — Tests and requirements EN 1991-1-1, Eurocode 1: Actions on structures — Part 1-1: General actions — Densities, self-weight, imposed loads for buildings EN 1991-1-3:2003, Eurocode 1 — Actions on structures — Part 1-3: General actions - Snow loads EN 1991-1-4, Eurocode 1: Actions on structures — Part 1-4: General actions - Wind actions EN 1993-1-1, Eurocode 3: Design of steel structures — Part 1-1: General rules and rules for buildings EN 1999-1-1, Eurocode 9: Design of aluminium structures — Part 1-1: General structural rules EN 12897, Water supply — Specification for indirectly heated unvented (closed) storage water heaters EN 12975-1:2006+A1:2010, Thermal solar systems and components — Solar collectors — Part 1: General requirements EN 12975–2, Thermal solar systems and components — Solar collectors — Part 2: Test methods SIST EN 12976-1:2017

EN 12976-1:2017 (E) 8 EN 12976-2:2017, Thermal solar systems and components — Factory made systems — Part 2: Test methods EN 12977-3, Thermal solar systems and components — Custom built systems — Part 3: Performance test methods for solar water heater stores EN 12977-5:2012, Thermal solar systems and components — Custom built systems — Part 5: Performance test methods for control equipment EN 13831:2007, Closed expansion vessels with built in diaphragm for installation in water EN 15092, Building valves— Inline hot water supply tempering valves — Tests and requirements CEN/TR 16355, Recommendations for prevention of Legionella growth in installations inside buildings conveying water for human consumption EN 60335-1, Household and similar electrical appliances — Safety — Part 1: General requirements (IEC 60335-1) EN 60335-2 (all parts), Household and similar electrical appliances — Safety (IEC 60335-2 series) EN ISO 9488:1999, Solar energy — Vocabulary (ISO 9488:1999) EN ISO 9806, Solar energy — Solar thermal collectors — Test methods (ISO 9806) ISO 9459-5, Solar heating — Domestic water heating systems — Part 5: System performance characterization by means of whole-system tests and computer simulation 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 9488:1999 and the following apply. 3.1 expansion line connecting line between the collectors and the pressure expansion vessel in the case of systems with closed expansions vessels; or connecting line between the collector array and the open expansion vessel in the case of systems with open expansion vessels 3.2 safety line connecting line between the collector array and the safety valve in the case of systems with closed expansion vessels; or connecting line between the collector array and the open expansion vessel in the case of systems with open expansion vessels 3.3 blow-off line connecting line between the outlet of the safety valve and the environment 3.4 factory-made solar system packaged solar energy system for the purpose of hot water preparation only, either of the close-coupled or remote-store type, consisting of either one integral component or of a uniform set and configuration SIST EN 12976-1:2017

EN 12976-1:2017 (E) 9 of components, produced under conditions which are presumed uniform, and offered for sale under the same trade name Note 1 to entry Components used for external mounting on or integration with essential building elements, e.g. roofs or facades, will require additional testing to demonstrate the suitability of application. 4 Requirements 4.1 General 4.1.1 Safety The system shall fulfil general safety requirements, e.g. care shall be taken to avoid protruding sharp edges on the outside of the system. 4.1.2 Suitability for drinking water The system shall conform to EN 806-1 and EN 806-2. NOTE See 4.6.2 c) 7) and 4.6.3 b) 3). 4.1.3 Water contamination The system shall be designed to avoid water contamination/ or growth of legionella for backflow from all circuits to drinking main supplies following guidelines set forth within the Technical Report CEN/TR 16355, highlighting the effect of temperature, the range in which the legionella is not able to proliferate and heat treatment methods for the purpose of disinfection. 4.1.4 Testing of resistance towards mechanical load The manufacturer shall define which maximum load the system can withstand. For testing the resistance of not-separable solar thermal systems, EN 12976-2:2017, 5.5 shall be applied. Test values applied to the cover, the collector box and the fixings between collector box and mounting system should be representative of the maximum loading likely to be experienced in the country where supplied. 4.1.5 Freeze resistance 4.1.5.1 General The manufacturer shall state a minimal allowed temperature for the system. The parts of the system that are exposed to the outdoors shall be able to withstand freezing to this specified temperature without any permanent damage. The manufacturer shall describe the method of freeze protection used for the system. Any indoor components that are to be installed in places where temperatures can drop below 0 °C, shall be protected against freezing. The freezing resistance shall be tested in accordance with EN 12976-2:2017, 5.1. 4.1.5.2 Freeze protection and safety precautions with antifreeze fluid The manufacturer shall define the composition of the heat transfer fluid, including additives, allowed for the system. In general where water vapour is produced in the collector array when the heat transfer liquid containing antifreeze fluid no longer flows through the collector and the sun is shining (stagnation conditions), the whole liquid content of the collector array shall be pushed out of the array within a few SIST EN 12976-1:2017

EN 12976-1:2017 (E) 10 minutes from the beginning of boiling in the collectors. The liquid shall flow out of the array through both the inlet and the outlet connections pipe work. For this purpose, the check valve shall be located in such a way that the expansion line of the collector array is not blocked by the check valve. The design of the collector shall enable the expulsion of the whole liquid content. The manufacturer shall define the composition of the heat transfer fluid, including additives, allowed for the system. Precautions shall be taken to prevent the antifreeze fluid from deterioration as a result of high temperature conditions. These precautions shall be checked in accordance with EN 12976-2:2017, 5.2. NOTE 1 If the expulsion of the whole liquid content of the collector array is not possible, water vapour is produced for a long period and condensates somewhere in the collector loop. This is a considerable heat transfer that can damage the parts on which vapour condensation occurs. Also, vapour production in large quantity in the collector arrays leads to higher concentrations of the antifreeze fluid and this fluid may become corrosive. Finally, some antifreeze fluids may solidify when concentration increases at high temperature. This may hinder any further fluid flow after stagnation has ceased. NOTE 2 In general, the lowest allowed temperature of the system is equal to the freezing point of the antifreeze fluid. If the concentration of some antifreeze fluids - like glycols - exceeds a certain limit, they can freeze without damaging the system. In this case the lowest allowed temperature can be lower than the freezing point of the antifreeze fluid. 4.1.6 Over temperature protection 4.1.6.1 General The system shall have been designed in such a way that prolonged high solar irradiation without heat consumption does not cause any situation in which special action by the user is required to bring the system back to normal operation. When the system has a provision to drain an amount of drinking water as a protection against overheating, the hot water drain shall be constructed in such a way that no damage is done to the system or any other materials in the house by the drained hot water. The construction shall be such that there is no danger to inhabitants from steam or hot water from the drain (see 4.6.2). When the overheating protection of the system is dependent on electricity supply and/or cold water supply, this shall be stated clearly in the instructions and on the system (see 4.6.3 and 4.7). NOTE For detailed information on the stagnation behaviour of solar thermal systems, please refer to a report of IEA SHC Task 26 on Solar Combisystems, prepared by Robert Hausner and Christian Fink, November 2002, http://task45.iea-shc.org/data/sites/1/publications/IEA-SHC-T45.A.2-INFO-Collector-loop-reqs.pdf. 4.1.6.2 Scald protection When the system is tested in accordance with EN 12976-2:2017, 5.2, no steam shall escape from any draw-off point. When this test has been performed with other than the highest irradiations this shall be mentioned in the documentation for the user (see 4.6.3). For systems in which the temperature of the domestic hot water delivered to the user can exceed 60 °C, the assembly instructions shall mention that an automatic cold water mixing device or any other device to limit the tapping temperature to at most 60 °C ± 5 °C shall be installed on the solar heating system or elsewhere in the domestic hot water installation (see also 4.6.2). This device shall be able to withstand the maximum possible domestic hot water temperature from the solar heating system. SIST EN 12976-1:2017

EN 12976-1:2017 (E) 11 4.1.6.3 Over temperature protection for materials The system shall have been designed in such a way that the maximal allowed temperature of any material in the system is never exceeded. Care should be taken in cases where under stagnation conditions steam or hot water can enter the collector pipes, pipe work, distribution network or heat exchanger. 4.1.7 Reverse flow protection The system shall contain provisions in order to prevent increased heat loss resulting from reverse flow in any circuit. This shall be checked in accordance with EN 12976-2:2017, 5.11. 4.1.8 Pressure resistance The storage tank and heat exchangers in this tank shall withstand 1,5 times the manufacturer's stated maximum individual working pressures. When tested in accordance with EN 12976-2:2017, 5.3, of to the above pressures, there shall be no visible permanent damage or leakage of the system components and interconnections. After the waiting period in the test, the hyd

...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.