CEN/TS 12977-1:2010

SLOVENSKI STANDARD
01-september-2010
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SIST ENV 12977-1:2002
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Thermal solar systems and components - Custom built systems - Part 1: General
requirements for solar water heaters and combisystems
Thermische Solaranlagen und ihre Bauteile - Kundenspezifisch gefertigte Anlagen - Teil
1: Allgemeine Anforderungen
Installations solaires thermiques et leurs composants - Installations assemblées à façon -
Partie 1: Exigences générales pour chauffe-eau solaires et installations mixtes
Ta slovenski standard je istoveten z: CEN/TS 12977-1:2010
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 12977-1
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
April 2010
ICS 27.160 Supersedes ENV 12977-1:2001
English Version
Thermal solar systems and components - Custom built systems
- Part 1: General requirements for solar water heaters and
combisystems
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 pour chauffe-eau solaires et installations mixtes Anforderungen an Solaranlagen zur Trinkwassererwärmung
und solare Kombianlagen
This Technical Specification (CEN/TS) was approved by CEN on 9 September 2008 for provisional application.

The period of validity of this CEN/TS 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 CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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 and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12977-1:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .4
Introduction .5
1 Scope .7
2 Normative references .7
3 Terms and definitions .8
4 Symbols and abbreviations . 10
5 System classification . 10
5.1 Small custom built systems . 10
5.2 Large custom built systems . 10
6 Requirements . 11
6.1 Introduction . 11
6.2 General . 11
6.2.1 Suitability for drinking water . 11
6.2.2 Water contamination . 11
6.2.3 Freeze resistance . 11
6.2.4 High-temperature protection . 11
6.2.5 Reverse circulation prevention . 12
6.2.6 Pressure resistance . 12
6.2.7 Electrical safety. 12
6.3 Materials . 12
6.4 Components and pipework . 12
6.4.1 Collector and collector array . 12
6.4.2 Supporting frame . 13
6.4.3 Collector and other loops . 13
6.4.4 Circulation pumps . 13
6.4.5 Expansion vessels . 13
6.4.6 Heat exchangers . 14
6.4.7 Water store(s) . 14
6.4.8 Pipework . 15
6.4.9 Thermal Insulation . 15
6.4.10 Control equipment . 15
6.5 Safety equipment and indicators . 15
6.5.1 Safety valves . 15
6.5.2 Safety lines and expansion lines . 15
6.5.3 Blow-off lines . 16
6.5.4 Store isolation valve . 16
6.5.5 Indicators . 16
6.6 Installation . 16
6.6.1 Roof tightness . 16
6.6.2 Lightning . 16
6.6.3 Snow and wind loads . 16
6.7 Initial operation and commissioning . 17
6.8 Documentation . 17
6.8.1 General . 17
6.8.2 Assortment file for small systems . 17
6.8.3 Documentation for small systems . 18
6.8.4 Documentation for large systems . 18
6.9 System performance . 19
6.10 Water wastage . 19
Bibliography . 20

Tables
Table 1 — Division for factory made and custom built solar heating systems . 6
Table 2 — Classes of small custom built systems according to their purpose . 10
Table 3 — Classification of large systems . 11

Foreword
This document (CEN/TS 12977-1:2010) has been prepared by Technical Committee CEN/TC 312 “Thermal
solar systems and components”, the secretariat of which is held by ELOT.
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 ENV 12977-1:2001.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: 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 and the United Kingdom.
Introduction
a) 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 document, it should be noted that:
1) this document provides no information as to whether the product may be used without restriction in
any of the Member States of the EU or EFTA;
2) while awaiting the adoption of verifiable European criteria, existing national regulations concerning
the use and/or the characteristics of this product remain in force.
a) Factory Made and Custom Built solar heating systems
EN 12976-1, EN 12976-2 and CEN/TS 12977-1 and -2, EN 12977-3, CEN/TS 12977-4 and -5 distinguish
two categories of solar heating systems:
1) Factory Made solar heating systems; and
2) 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:
3) 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. Requirements and
test methods for Factory Made solar heating systems are given in EN 12976-1 and EN 12976-2.
4) 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 12977-1 and -2, EN 12977-3, CEN/TS 12977-4 and -5. Custom
Built solar heating systems are subdivided into two categories:
i) Large Custom Built systems are uniquely designed for a specific situation. In general they are
designed by HVAC engineers, manufacturers or other experts.
ii) 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) (CEN/TS 12977-1, -2, -4, -5 and EN 12977-3)
Integral collector-storage systems for domestic hot
Forced-circulation systems for hot water preparation
water preparation
and/or space heating/cooling, assembled using
components and configurations described in a
Thermosiphon systems for domestic hot water
documentation file (mostly small systems)
preparation
Uniquely designed and assembled systems for hot
Forced-circulation systems as batch product with
water preparation and/or space heating/cooling
fixed configuration for 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 for domestic hot water preparation are performance tested
under the same set of basic reference conditions as specified in EN 12976-2:2006, Annex B and in
CEN/TS 12977-2:2010, Annex A. In practice, the installation conditions may differ from these reference conditions.
NOTE 3 Solar heating systems for both heating and cooling can so far not be performance tested; if cooling option is
not considered then the solar heating can be performance tested as a space heating system.
1 Scope
This Technical Specification specifies requirements on durability, reliability and safety of small and large
custom built solar heating and cooling systems with liquid heat transfer medium in the collector loop for
residential buildings and similar applications.
This document contains also requirements on the design process of large custom built systems.
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 253, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks —
Pipe assembly of steel service pipe, 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 exchangers
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 1151-1, Pumps — Rotodynamic pumps — Circulation pumps having a rated power input not exceeding
200 W for heating installations and domestic hot water installations — Part 1: Non-automatic circulation
pumps, 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
EN 1999-1-1, Eurocode 9: Design of aluminium structures — Part 1-1: General structural rules
EN 12975-1:2006, 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
EN 12976-1:2006, Thermal solar systems and components — Factory made systems — Part 1: General
requirements
CEN/TS 12977-2:2010, Thermal solar systems and components — Custom built systems — Part 2: Test
methods for solar water heaters and combisystems
EN 12977-3, Thermal solar systems and components — Custom built systems — Part 3: Performance test
methods for solar water heater stores
CEN/TS 12977-4, Thermal solar systems and components — Custom built systems — Part 4: Performance
test methods for solar combistores
CEN/TS 12977-5, Thermal solar systems and components — Custom built systems — Part 5: Performance
test methods for control equipment
EN 60335-1, Household and similar electrical appliances — Safety — Part 1: General requirements
(IEC 60335-1:2001, modified)
EN 60335-2-21, Household and similar electrical appliances — Safety — Part 2-21: Particular requirements
for storage water heaters (IEC 60335-2-21:2002, modified)
EN ISO 9488:1999, 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 document, the terms and definitions given in EN 12975-1:2006, EN 12976-1:2006
and EN ISO 9488:1999 and the following apply.
3.1
assortment
complete list of components (collectors, stores, controllers, pumps, etc.) which a company offers for its solar
heating systems
NOTE For the purpose of this document 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
3.3
blow-off line
connecting line between the outlet of the safety valve and the environment (preferably an open vessel at
atmospheric pressure)
3.4
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
3.5
control equipment
controllers, sensors, pumps, actuators, etc. used for controlling a solar heating systems including optional
auxiliary heaters and other parts of the heating generating and distribution system
NOTE Requirements and test methods for control equipment are given in CEN/TS 12977-5.
3.6
solar combisystem
solar heating system providing both hot water and space heating
3.7
expansion line
connecting line between the collectors and the pressure expansion
vessel
connecting line between the collector array and the open expansion
vessel
3.8
flow rate
circulation rate
3.9
large custom built system
solar heating system for the purpose of hot water preparation and/or space heating/cooling, which is designed
for a specific situation by combining various components to a unique system
2 3
NOTE In general the collector area is greater than 30 m and the store volume is greater than 3 m .
3.10
safety line
connecting line between the collector array and the safety valve
connecting line between the collector array and the open expansion
vessel
3.11
safe valve
pressure limiting valve
3.12
small custom built system
modular solar heating system of the remote storage type for the purpose of hot water preparation and/or
space heating and/or cooling
NOTE 1 The system has a well identified configuration (see 3.8). It is assembled from components chosen from the
market and described in an assortment file prepared by a company.
NOTE 2 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.
2 2
NOTE 3 In general the collector area is greater than 1 m and less than 30 m and the store volume is less than 3 m³.
NOTE 4 The system can be tested by experimentally testing the components and predicting the system performance
for different combinations of components by computer simulation.
3.13
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
NOTE Systems differing by any other parameter, by the type or dimensions of the used components o
...