SIST EN 12976-1:2006
(Main)Thermal solar systems and components - Factory made systems - Part 1: General requirements
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 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).
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 für den Installateur und für den Anwender, die mit diesen Anlagen beliefert wird, angegeben (siehe auch 4.6).
Installations solaires thermiques et leurs composants - Installations préfabriquées en usine - Partie 1 : Exigences générales
Toplotni sončni sistemi in sestavni deli - Industrijsko izdelani sistemi - 1. del: Splošne zahteve
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12976-1:2006
01-maj-2006
1DGRPHãþD
SIST EN 12976-1:2002
7RSORWQLVRQþQLVLVWHPLLQVHVWDYQLGHOL,QGXVWULMVNRL]GHODQLVLVWHPLGHO
6SORãQH]DKWHYH
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: EN 12976-1:2006
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
SIST EN 12976-1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 12976-1:2006
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SIST EN 12976-1:2006
EUROPEAN STANDARD
EN 12976-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2006
ICS 27.160 Supersedes EN 12976-1:2000
English Version
Thermal solar systems and components - Factory made
systems - Part 1: General requirements
Installation solaires thermiques et leur composants - Thermische Solaranlagen und ihre Bauteile - Vorgefertigte
Installations préfabriquées en usine - Partie 1 : Exigence Anlagen - Teil 1: Allgemeine Anforderungen
générales
This European Standard was approved by CEN on 9 December 2005.
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. Up-to-date lists and bibliographical references concerning such national
standards 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 translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12976-1:2006: E
worldwide for CEN national Members.
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
Contents Page
Foreword .3
Introduction.4
1 Scope .6
2 Normative references .6
3 Terms and definitions.6
3.1 expansion line .6
3.2 safety line .7
3.3 blow-off line.7
3.4 factory-made solar system.7
4 Requirements .7
4.1 General .7
4.1.1 Suitability for drinking water.7
4.1.2 Water contamination.7
4.1.3 Freeze resistance.8
4.1.4 Overtemperature protection.8
4.1.5 Reverse flow protection .9
4.1.6 Pressure resistance.9
4.1.7 Electrical safety.9
4.2 Materials .9
4.3 Components and pipework .10
4.3.1 Collector .10
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 Labeling .14
4.8 System performance.14
Annex A (informative) Conformity assessment .15
Bibliography.16
2
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
Foreword
This European Standard (EN 12976-1:2006) 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 2006, and conflicting national standards shall be withdrawn at the
latest by July 2006.
This European Standard supersedes EN 12976-1:2000.
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.
3
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
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 as well as EN 12976-2 and the prestandards ENV 12977-1 to ENV 12977-3
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 ENV 12977-1; test methods are specified in ENV 12977-2
and ENV 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.
4
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
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
(EN 12976-1, -2) (ENV 12977-1, -2, -3)
Integral collector-storage systems for Forced-circulation systems for hot water preparation
domestic hot water preparation and/or space heating, assembled using components
Thermosiphon systems for domestic hot and configurations described in a documentation file
water preparation (mostly small systems)
Forced-circulation systems as batch Uniquely designed and assembled systems for hot
product with fixed configuration for water preparation and/or space heating (mostly large
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 Annex B of EN 12976-2:2006 and Annex A of ENV 12977-2:2001. 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.
5
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
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 809, Pumps and pump units for liquids — General safety requirements
EN 1151, Pumps — Rotodynamic pumps — Circulation pumps having an electrical effect not exceeding 200
W for heating installations and domestic hot water installations — Requirements, testing, marking
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
prEN 1999-1-1, Eurocode 9: Design of Aluminium Structures - Part 1-1: General rules
prEN 12975-1, Thermal solar systems and components — Solar collectors — Part 1: General requirements
prEN 12975-2, Thermal solar systems and components — Solar collectors — Part 2: Test methods
EN 12976-2:2006, Thermal solar systems and components — Factory made systems — Part 2: Test
methods
EN ISO 9488:1999, Solar energy — Vocabulary (ISO 9488:1999)
ISO/TR 10217, Solar energy — Water heating systems — Guide to material selection with regard to internal
corrosion
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN ISO 9488:1999 and the
following apply.
3.1
expansion line
for systems with closed expansion vessels, the connecting line between the collectors and the pressure
expansion vessel
6
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
For systems with open expansion vessels, the connecting line between the collector array and the open
expansion vessel.
3.2
safety line
for systems with closed expansion vessels: the connecting line between the collector array and the safety
valve
For systems with open expansion vessels: the 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. The system consists of either one integral component or of a uniform set and configuration
of components. It is 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
The system shall fulfil general safety requirements, e.g. care shall be taken to avoid protruding sharp edges
on the outside of the system.
4.1.1 Suitability for drinking water
The system shall conform to EN 806-1 (see also Introduction).
4.1.2 Water contamination
The system has to be designed to avoid water contamination for backflow from all circuits to drinking main
supplies.
7
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SIST EN 12976-1:2006
EN 12976-1:2006 (E)
4.1.3 Freeze resistance
4.1.3.1 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 EN 12976-2:2006.
4.1.3.2 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 EN 12976-2:2006.
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.
4.1.4 Over temperature protection
4.1.4.1 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 b
...
EUROPEAN STANDARD
DRAFT
prEN 12976-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2004
ICS Will supersede EN 12976-1:2000
English version
Thermal solar systems and components - Factory Made
systems - General requirements
Installations solaires thermiques et leurs composants -
Installations préfabriquées en usine - Partie 1: Exigences
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 Management Centre has the same
status as the official versions.
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, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12976-1:2004: E
worldwide for CEN national Members.
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prEN 12976-1:2004 (E)
Contents
Page
Foreword .3
Introduction.4
1 Scope .6
2 Normative references .6
3 Terms and definitions.6
4 Requirements .7
4.1 General.7
4.1.1 Suitability for drinking water .7
4.1.2 Water contamination .7
4.1.3 Freeze resistance.7
4.1.4 Overtemperature protection .8
4.1.5 Reverse flow protection .8
4.1.6 Pressure resistance.8
4.2 Materials.9
4.3 Components and pipework.9
4.3.1 Collector.9
4.3.2 Supporting frame .9
4.3.3 Piping .9
4.3.4 Circulation pump .9
4.3.5 Heat Exchangers.9
4.3.6 Store.10
4.3.7 Control system.10
4.4 Safety equipment .10
4.4.1 Safety valves .10
4.4.2 Safety lines and expansion lines.10
4.4.3 Blow-off lines .10
4.5 Resistance to external influences .10
4.6 Documentation.11
4.6.1 General.11
4.6.2 Documents for the installer .11
4.6.3 Documents for the user.12
4.7 Marking .12
4.8 System performance.13
Annex A (informative) Conformity assessment .14
Bibliography.16
2
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prEN 12976-1:2004 (E)
Foreword
This document (prEN 12976-1:2004) 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 12976-1:2000.
Annex A is informative.
3
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prEN 12976-1:2004 (E)
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 12976-1:2000 as well as EN 12976-2:2000 and the prestandards prENV 12977-1:2000 to
prENV 12977-3:2000 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-
1:2000 and EN 12976-2:2000.
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 sepa-
rately tested and test results are integrated to an assessment of the whole system. Requirements for Custom
Built solar heating systems are given in prENV 12977-1:2000, test methods are specified in prENV 12977-
2:2000 and prENV 12977-3:2000. 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
(EN 12976-1, -2) (ENV 12977-1, -2, -3)
Integral collector-storage systems for Forced-circulation systems for hot water preparation
domestic hot water preparation and/or space heating, assembled using components
Thermosiphon systems for domestic hot and configurations described in a documentation file
water preparation (mostly small systems)
Forced-circulation systems as batch Uniquely designed and assembled systems for hot
product with fixed configuration for water preparation and/or space heating (mostly large
domestic hot water preparation systems)
4
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prEN 12976-1:2004 (E)
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 annex B of EN 12976-2:2000 and annex A of prENV 12977-2:2000. In practice, the in-
stallation 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, how-
ever this option should not be used or considered during testing as a Factory Made system.
5
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prEN 12976-1:2004 (E)
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 require-
ments.
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 the clause 3).
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 307, Heat exchangers — Guidelines to prepare installation, operating and maintenance instructions
required to maintain the performance of each type of heat exchanger
EN 806-1:1999, Specifications for installations inside buildings conveying water for human consumption —
Part 1: General
EN 809, Pumps and pump units for liquids — General safety requirements
EN 1151, Pumps — Rotodynamic pumps — Circulation pumps having an electrical effect not exceeding 200
W for heating installations and domestic hot water installations — Requirements, testing, marking
EN 1489, Building valves — Pressure safety valve — Tests and requirements
EN 1490, Building valves — Combined temperature and pressure relief valves — Tests and requirements
EN 1717, Protection against pollution of potable water in drinking water installations and general requirements
of devices to prevent pollution by backflow
ENV 1991-2-3, Eurocode 1 — Basis of design and actions on structures — Part 2 - 3: Action on structures -
Snow loads
ENV 1991-2-4, Eurocode 1: Basis of design and actions on structures — Part 2 - 4: Action on structures -
Wind loads
EN 12975-1:2000, Thermal solar systems and components — Solar collectors — Part 1: General require-
ments
EN 12975-2, Thermal solar systems and components — Solar collectors — Part 2: Test methods
EN 12976-2:2000, Thermal solar systems and components — Factory made systems — Part 2: Test methods
EN 60335-1, Safety of household and similar electrical appliances — Part 1: General requirements
(IEC 60335-1:1991 modified)
EN 60335-2-21, Safety of household and similar electrical appliances — Part 2: Particular requirements for
storage water heaters (IEC 60335-2-21:1997 + Corrigendum 1998, modified)
ENV 61024-1, Protection of structures against lightning — Part 1: General principles (IEC 61024-1:1990,
modified)
EN ISO 9488, Solar energy — Vocabulary (ISO 9488:1999)
ISO/TR 10217, Solar energy — Water heating systems — Guide to material selection with regard to internal
corrosion
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in EN ISO 9488 apply, together with the
following additional definition:
6
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prEN 12976-1:2004 (E)
Factory Made solar system
A packaged solar energy system for the purpose of hot water preparation only, either of the close-coupled or
remote-store type. The system consists of either one integral component or of a uniform set and configuration
of components. It is 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 In-
troduction).
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 con-
sidered to be part of the system.
4 Requirements
4.1 General
The system shall fulfil general safety requirements, e.g. care shall be taken to avoid protruding sharp edges on
the outside of the system.
4.1.1 Suitability for drinking water
The system shall conform to EN 806-1:1999 (see also Introduction).
4.1.2 Water contamination
The system shall conform to EN 1717.
4.1.3 Freeze resistance
4.1.3.1 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 EN 12976-2.
4.1.3.2 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 EN 12976-2.
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 an-
tifreeze fluid.
7
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prEN 12976-1:2004 (E)
4.1.4 Overtemperature protection
The system shall have been designed in such a way that prolonged high solar irradiation without heat consump-
tion 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).
In case of drainback, system shall be checked in accordance with 5.1 of EN 12976-2.
4.1.4.1 Scald protection
When the system is tested in accordance with 5.2 of EN 12976-2, 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 system or elsewhere in the domestic
hot water installation (see also 4.6.2).
This device shall be able to withstand the maximum possible tap water temperature from the solar system.
4.1.4.2 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.
4.1.5 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 5.11 of EN 12976-2:2000.
4.1.6 Pressure resistance
The storage tank and heat exchangers in this tank shall withstand the lowest of the following pressures:
- 1,5 times the manufacturer's stated maximum working pressure;
- the manufacturer's stated maximum test pressure.
When tested in accordance with 5.3 of EN 12976-2:2000 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 hydraulic pressure shall not have dropped more than 10 % from the value measured at the start of the
waiting period.
When non-metall
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