ENV 12977-1:2001

SLOVENSKI STANDARD
SIST ENV 12977-1:2002
01-november-2002
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Thermal solar systems and components - Custom built systems - Part 1: General
requirements
Thermische Solaranlagen und ihre Bauteile - Kundenspezifisch gefertigte Anlagen - Teil
1: Allgemeine Anforderungen
Installations solaires thermiques et leurs composants - Installations assemblées a façon -
Partie 1: Exigences générales
Ta slovenski standard je istoveten z: ENV 12977-1:2001
ICS:
27.160 6RQþQDHQHUJLMD Solar energy engineering
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST ENV 12977-1:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ENV 12977-1:2002

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SIST ENV 12977-1:2002
EUROPEAN PRESTANDARD
ENV 12977-1
PRÉNORME EUROPÉENNE
EUROPÄISCHE VORNORM
April 2001
ICS 27.160
English version
Thermal solar systems and components - Custom built systems
- Part 1: General requirements
Installations solaires thermiques et leurs composants - Thermische Solaranlagen und ihre Bauteile -
Installations assemblées à façon - Partie 1: Exigences Kundenspezifisch gefertigte Anlagen - Teil 1: Allgemeine
générales Anforderungen
This European Prestandard (ENV) was approved by CEN on 12 March 2001 as a prospective standard for provisional application.
The period of validity of this ENV is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the ENV can be converted into a European Standard.
CEN members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final
decision about the possible conversion of the ENV into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. ENV 12977-1:2001 E
worldwide for CEN national Members.

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SIST ENV 12977-1:2002
Page 2
ENV 12977-1:2001
Contents
Page
Foreword.2
Introduction.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .6
4 Symbols and abbreviations .8
5 System classification.8
6 Requirements .9
Foreword
This European Prestandard has been prepared by Technical Committee CEN/TC 312 "Thermal
solar systems and components", the secretariat of which is held by ELOT.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to announce this European Prestandard: Austria, Belgium,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United
Kingdom.

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SIST ENV 12977-1:2002
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ENV 12977-1:2001
Introduction
Drinking water quality
In respect of potential adverse effects on the quality of drinking water intended for human
consumption, caused by the product covered by this Prestandard it should be noted that:
a) This Prestandard 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) 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 and EN 12976-2 as well as 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 to 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 configuration. 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. They are in
general designed by HVAC engineers, manufacturers or other experts.

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 Custom Built system.
one

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SIST ENV 12977-1:2002
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ENV 12977-1:2001
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
and configurations described in a documentation file
Thermosiphon systems for domestic hot
(mostly small systems)
water preparation
Forced-circulation systems as batch Uniquely designed and assembled systems for hot water
product with fixed configuration for preparation and/or space heating
domestic hot water preparation (mostly large 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 12976-2:2000 and annex A of ENV 12977-2:2001. In practice,
the installation conditions may differ from these reference conditions.

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SIST ENV 12977-1:2002
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ENV 12977-1:2001
1 Scope
This European Prestandard specifies requirements on durability, reliability and safety of small
and large custom built solar heating systems with liquid heat transfer medium for residential
buildings and similar applications. The Prestandard contains also requirements on the design
process of large custom built systems.
2 Normative references
This European Prestandard incorporates, by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Prestandard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
EN 253 Preinsulated bonded pipe systems for underground hot water networks -
Pipe assembly of steel service pipes, polyurethane thermal insulation and
outer casing of polyethylene
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 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 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 actions
prEN 12828:1997 Heating systems in buildings – Design and installation of water heating
systems
prEN 12897:1997 Water supply - Specification for indirectly heated unvented (closed) hot
water storage systems
EN 12975-1 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

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SIST ENV 12977-1:2002
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ENV 12977-1:2001
EN 12976-1:2000 Thermal solar systems and components - Factory made systems – Part 1:
General requirements
Thermal solar systems and components - Custom built systems – Part 2:
ENV 12977-2:2001
Test methods
Thermal solar systems and components – Custom built systems – Part 3:
ENV 12977-3
Performance characterization of stores for solar heating systems
EN 60335-1 Safety of household and similar electrical appliances - Part 1: General
requirements (IEC 60335-1:1991 modified)
EN 60335-2-21:1999 Safety of household and similar electrical appliances - Part 2: Particular
requirements for storage water heaters (IEC 60335-2-21:1997 +
corrigendum 1998, modified)
ENV 61024-1:1995 Protection of structures against lightning - Part 1: General principles
(IEC 61024-1:1990, modified)
EN ISO 9488 Solar energy – Vocabulary (ISO 9488:1999)
ISO 9459-1:1993 Solar heating - Domestic water heating systems - Part 1: Performance
rating procedure using indoor test methods
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 Prestandard, the terms and definitions given in EN 12975-1, EN 12976-1
and EN ISO 9488 apply together with the following.
3.1
assortment
complete list of components (collectors, stores, controllers, pumps etc.) which a company offers
for its solar heating systems. For the purpose of this Prestandard the assortment is restricted to
components used for small custom built solar heating systems marketed by a company
3.2
assortment file
technical documentation file for small custom built systems of a company which includes:
the complete assortment for small custom built systems



the complete description of all system configurations

the complete description of all marketed combinations of system configurations and
components including the component dimensions and number of units

further technical information

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ENV 12977-1:2001
3.3
collector array
group of collectors that are closely connected in series, in parallel or in combination of both
modes, with one hydraulic input and one hydraulic output
3.4
expansion line
for systems with closed expansion vessels, the connecting line between the collectors and the
pressure expansion vessel
For systems with open expansion vessels, the connecting line between the collector array and the
open expansion vessel
3.5
large custom built system
solar heating system for the purpose of hot water preparation and/or space heating. It is designed
for a specific situation by combining various components to a unique system.
NOTE 1 In general, large custom built systems are designed by HVAC engineers, manufacturers or other
experts.
NOTE 2 In general the collector area is greater than 30 m² and the store volume is greater than 3 m³.
3.6
safety line
systems with closed expansion vessels: connecting line between the collector array and the safety
valve
Systems with open expansion vessels: connecting line between the collector array and the open
expansion vessel
3.7
small custom built system
modular solar heating system of the remote storage type for the purpose of hot water preparation
and/or space heating. The system has a well identified configuration (see definition in 3.8). It is
assembled from components chosen from the market and described in an assortment file
prepared by a company
NOTE 1 In general the assortment file includes the possible system configurations, the assortment of
components and their possible combinations and dimensions. The ‘company’ may be the manufacturer of all or of
parts of the components in the assortment; this company may also be only a consulting engineer who just produces
the technical documentation and purchases the components from suppliers.
NOTE 2 In general the collector area is greater than 1 m² and less than 30 m² and the store volume is less
than 3 m³.
NOTE 3 The system can be tested by experimentally testing the components and predicting the system
performance for different combinations of components by computer simulation.

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SIST ENV 12977-1:2002
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ENV 12977-1:2001
3.8
system configuration
characteristics of a solar heating system including its hydraulic scheme (hydraulic connections
between the collector array, the store(s) and other components) and its control concept. Systems
differing by any other parameter, by the type or dimensions of the used components or the
controller settings are considered to have the same configuration
4 Symbols and abbreviations
( ) stand-by heat loss rate of the store
UA
S,a,sb
V store volume
S
5 System classification
5.1 Small custom built systems
Small custom built systems are classified as described in clause 5 of ISO 9459-1:1993.
According to the purpose of these systems the following additional classification applies (see
Table 2):
Table 2 - Classes of small custom built systems according to their purpose
Class Purpose
A domestic hot water preparation only
B space heating only
C domestic hot water preparation and space heating
5.2 Large custom built systems
Large custom built systems are classified in accordance with Table 3.
Table 3 - Classification of large systems
Class Purpose
A A system in which the store(s) and the collector array(s) are located in one
building for which the heat is provided. No seasonal store and no heat
distribution network outside the building are included.
B A system which consists of a central heating plant and one or more
collector array(s). The heat is transported via a heat distribution network to
the heating plant and/or to other buildings. No seasonal store is included.
C A large custom built system which mainly consists of one or more large
collector array(s) and in which the heat is transferred to a seasonal store or
directly into a heat distribution network.
NOTE: Large systems of type A are generally used for large multi-family
houses.
Large systems of type B are generally used for district heating systems without
any seasonal store.
Large systems of type C are generally used for large district heating systems.

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ENV 12977-1:2001
6 Requirements
Subsequent requirements refer to the test methods given in ENV 12977-2.
NOTE The numbering of the following clauses is kept in direct correspondence to the numbering of ENV
12977-2.
6.1 General
6.1.1 Suitability for drinking water
See EN 806-1.
6.1.2 Water contamination
See EN 1717.
NOTE See also the introduction about water quality.
6.1.3Freeze resistance
See 4.1.3 of EN 12976-1:2000.
6.1.4 Overheating protection
6.1.4.1 Scald protection
Systems in which the temperature of the domestic hot water delivered to the user can exceed
60 °C, shall be fitted with an automatic cold water mixing device or any other device to limit the
temperature to at maximum 60 °C shall be installed.
6.1.4.2 Overheating protection for materials
The design of the system shall ensure that the highest permissible temperatures to which the
system components may be exposed are not 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.
6.1.5Reverse flow prevention
The installation of the system as described in the hydraulic scheme shall ensure that no
unintentional reverse flow occurs in any hydraulic loop of the system.
6.1.6Pressure resistance
The store tank and the heat exchangers in this tank shall comply with the requirements given in
prEN 12897:1997. The collector shall comply with the requirements given in EN 12975-1.
Any components in the systems which are not covered by prEN 12897:1997 or EN 12975-1 shall
withstand the lower of the following pressures:

1,5 times the manufacturer’s stated maximum working pressure,

the manufacturer’s stated maximum test pressure
for the the part of the system in which these component is used.
NOTE 1 In addition collector arrays of large custom built systems should be designed in a way, that they
can also withstand
...