prEN 12976-1

SLOVENSKI STANDARD
01-april-2012
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Thermal solar systems and components - Factory made systems - Part 1: General
requirements
Thermische Solaranlagen und ihre Bauteile - Vorgefertigte Anlagen - Teil 1: Allgemeine
Anforderungen
Installations solaires thermiques et leurs composants - Installations préfabriquées en
usine - Partie 1 : Exigences générales
Ta slovenski standard je istoveten z: prEN 12976-1
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2012
ICS 27.160 Will supersede EN 12976-1:2006
English Version
Thermal solar systems and components - Factory made
systems - Part 1: General requirements
Installations solaires thermiques et leurs composants - Thermische Solaranlagen und ihre Bauteile - Vorgefertigte
Installations préfabriquées en usine - Partie 1 : Exigences Anlagen - Teil 1: Allgemeine Anforderungen
générales
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 312.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12976-1:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 Requirements .7
4.1 General .7
4.1.1 Safety .7
4.1.2 Suitability for drinking water .7
4.1.3 Water contamination .7
4.1.4 Freeze resistance .8
4.1.5 Over temperature protection .8
4.1.6 Reverse flow protection .9
4.1.7 Pressure resistance .9
4.1.8 Electrical safety .9
4.2 Materials .9
4.3 Components and pipework .9
4.3.1 Collector .9
4.3.2 Supporting frame . 10
4.3.3 Piping . 10
4.3.4 Heat Exchangers . 10
4.3.5 Control system . 10
4.4 Safety equipment . 11
4.4.1 Safety valves . 11
4.4.2 Safety lines and expansion lines . 11
4.4.3 Blow-off lines . 11
4.5 Resistance to external influences . 11
4.6 Documentation . 11
4.6.1 General . 11
4.6.2 Documents for the installer . 12
4.6.3 Documents for the user . 13
4.7 Labelling . 14
4.8 System performance . 15
Annex A (informative) Conformity assessment . 16
Annex B (informative) Material combination with regard to corrosion . 17
Bibliography . 19

Foreword
This document (prEN 12976-1:2012) has been prepared by Technical Committee CEN/TC 312 “Thermal solar
systems and components”, the secretariat of which is held by ELOT.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12976-1:2006.
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 prEN 12976-1, prEN 12976-2, CEN/TS 12977-1, CEN/TS 12977-2, EN 12977-3, CEN/TS 12977-4
and CEN/TS 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
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 CEN/TS 12977-1; test methods are specified in
CEN/TS 12977-2 and EN 12977-3. 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.
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 Custom Built Solar Heating Systems
(prEN 12976-1 & prEN 12976-2) (CEN/TS 12977-1, CEN/TS 12977-2 & EN 12977-3)
Integral collector-storage systems for domestic hot
Forced-circulation systems for hot water preparation
water preparation
and/or space heating, assembled using components
and configurations described in a documentation file
Thermosiphon systems for domestic hot water
(mostly small systems)
preparation
Uniquely designed and assembled systems for hot
Forced-circulation systems as batch product with
water preparation and/or space heating (mostly large
fixed configuration for domestic hot water preparation
systems)
NOTE 1 Forced circulation systems can be classified either as Factory Made or as Custom Built, depending on the
market approach chosen by the final supplier.
NOTE 2 Both Factory Made and Custom Built systems are performance tested under the same set of reference
conditions as specified in prEN 12976-2:2012, Annex B, and in CEN/TS 12977-2:2010, Annex A. In practice, the
installation conditions may differ from these reference conditions.
NOTE 3 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.
1 Scope
This European Standard specifies requirements on durability, reliability and safety for Factory Made thermal
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).
2 Normative references
The following referenced documents are indispensable for the application of this European Standard. 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 — General 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 1991-1-3, 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 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
prEN 12976-2:2012, Thermal solar systems and components — Factory made systems — Part 2: Test methods
CEN/TS 12977-5, Thermal solar systems and components — Custom built systems — Part 5: Performance
test methods for control equipment
EN 15092, Building valves — Inline hot water supply tempering valves — Tests and requirements
EN 60335-1, Household and similar electrical appliances — Safety — Part 1: General requirements
(IEC 60335-1)
EN 60335-2-21, Household and similar electrical appliances — Safety — Part 2-21: Particular requirements
for storage water heaters (IEC 60335-2-21)
EN ISO 9488:1999, Solar energy — Vocabulary (ISO 9488:1999)
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
connecting line between the collector array and the open expansion
vessel.
3.2
safety line
connecting line between the collector array and the safety valve
connecting line between the collector array and the open expansion
vessel
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 of
components, produced under conditions which are presumed uniform, and offered for sale under the same
trade name
NOTE 1 A single system can be tested as a whole in a test laboratory, leading to representative results for all systems
with the same trade name, configuration, components and dimensions (see also the Introduction).
NOTE 2 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 tapping 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.
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 has to be designed to avoid water contamination for backflow from all circuits to drinking main
supplies.
4.1.4 Freeze resistance
4.1.4.1 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 mechanism shall be tested in accordance with 5.1 of prEN 12976-2:2012.
4.1.4.2 Freeze protection by means of antifreeze fluid
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 5.2 of prEN 12976-2:2012.
NOTE In general the minimal 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 minimal allowed temperature can be lower than the freezing point of the antifreeze fluid.
4.1.5 Over temperature protection
4.1.5.1 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).
4.1.5.2 Scald protection
When the system is tested in accordance with 5.2 of prEN 12976-2:2012, no steam shall escape from any tapping
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.
4.1.5.3 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.
NOTE Care should be taken in cases where under stagnation conditions steam or hot water can enter the collector
pipes, pipework, distribution network or heat exchanger).
4.1.6 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 5.10 of prEN 1297
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