Water based surface embedded heating and cooling systems - Part 4: Installation

The EN 1264 series gives guidelines for surface embedded heating and cooling systems installed in buildings, residential and non-residential (e.g. office, public, commercial and industrial buildings) and focuses on systems installed for the purpose of thermal comfort.
The EN 1264 series gives guidelines for water based heating and cooling systems embedded into the enclosure surfaces of the room to be heated or to be cooled. It also specifies the use of other heating media instead of water, as appropriate.
The EN 1264 series specifies standardized product characteristics by calculation and testing the thermal output of heating for technical specifications and certification. For the design, construction and operation of these systems, see EN 1264-3 and EN 1264-4 for the types A, B, C, D, H, I and J. For the types E, F and G, see the EN ISO 11855 series.
The systems specified in The EN 1264 series are adjoined to the structural base of the enclosure surfaces of the building, mounted directly or with fixing supports. The EN 1264 series does not specify ceiling systems mounted in a suspended ceiling with a designed open air gap between the system and the building structure which allows the thermally induced circulation of the air. The thermal output of these systems can be determined according to the EN 14037 series and EN 14240.
EN 1264-4 specifies uniform requirements for the design and the construction of heating and cooling floor, ceiling and wall structures to ensure that the heating/cooling systems are suited to the particular application.
The requirements specified by the EN 1264 series apply only to the components of the heating/cooling systems which are part of the heating/cooling system. EN 1264-4 does not cover other elements which are not part of the heating/cooling system.

Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 4: Installation

Die Normenreihe EN 1264 gibt Leitlinien für in Wohn- und anderen Gebäuden (z. B. Bürogebäuden, öffentlichen Gebäuden sowie Gewerbe- und Industriegebäuden) installierte raumflächenintegrierte Heiz- und Kühlsysteme und legt einen Schwerpunkt auf Systeme, die für den Zweck der thermischen Behaglichkeit installiert werden.
Die Normenreihe EN 1264 gibt Leitlinien für Heiz- und Kühlsysteme mit Wasserdurchströmung, die in die Raumumschließungsflächen des zu heizenden oder des zu kühlenden Raumes eingebettet sind. Sie legt ggf. auch die entsprechende Verwendung anderer Heizmittel als Wasser fest.
Die Normenreihe EN 1264 legt die Identifizierung standardisierter Produktmerkmale durch Berechnung und Prüfung der Wärmeleistung der Heizung für technische Spezifikationen und die Zertifizierung fest. Für das Design, den Bau und den Betrieb dieser Anlagen siehe EN 1264 3 und EN 1264 4 für die Typen A, B, C, D, H, I und J. Für die Typen E, F und G siehe Normenreihe EN ISO 11855.
Die in der Normenreihe EN 1264 festgelegten Systeme grenzen an den tragenden Untergrund der Umschließungsflächen des Gebäudes an und werden direkt oder mit Befestigungshalterungen angebracht. Die Normenreihe EN 1264 trifft keine Festlegungen für in abgehängten Decken montierte Deckensysteme mit einem auslegungsgemäßen offenen Luftspalt zwischen dem System und der Gebäudestruktur, der eine thermisch induzierte Umwälzung der Luft erlaubt. Die Wärmeleistung dieser Systeme kann nach der Normenreihe EN 14037 und EN 14240 bestimmt werden.
EN 1264 4 legt einheitliche Anforderungen an die Planung und den Aufbau von zur Heizung oder Kühlung dienenden Fußboden , Decken- und Wandkonstruktionen fest, um sicherzustellen, dass die Heiz  bzw. Kühlsysteme für den jeweiligen Verwendungszweck geeignet sind.
Die in der Normenreihe EN 1264 festgelegten Anforderungen gelten nur für die unmittelbar zum Heiz  bzw. Kühlsystem gehörenden Bauteile. EN 1264 4 deckt keine anderen Bauteile ab, die nicht unmittelbar zum Heiz  bzw. Kühlsystem gehören.

Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 4: Installation

La série EN 1264 fournit des lignes directrices pour les systèmes de surfaces chauffantes et rafraîchissantes intégrées dans les bâtiments résidentiels et non résidentiels (par exemple, des bureaux, des bâtiments publics, commerciaux et industriels), et se concentre sur les systèmes installés à des fins de confort thermique.
La série EN 1264 fournit des lignes directrices pour les systèmes de surfaces chauffantes et rafraîchissantes intégrées dans les parois des pièces à chauffer ou à rafraîchir. Elle spécifie également l'utilisation de fluides caloporteurs autres que l'eau, le cas échéant.
La série EN 1264 spécifie les caractéristiques normalisées des produits en calculant et en mettant à l'essai l'émission thermique du chauffage pour les spécifications techniques et la certification. Pour la conception, la construction et le fonctionnement de ces systèmes, voir l'EN 1264-3 et l'EN 1264-4 pour les types A, B, C, D, H, I et J. Pour les types E, F et G, voir la série EN ISO 11855.
Les systèmes spécifiés dans la série EN 1264 sont fixés directement ou à l'aide de supports de fixation au plancher porteur des parois du bâtiment. La série EN 1264 ne spécifie pas les systèmes de plafond montés dans un plafond suspendu, dont l'entrefer ouvert conçu entre le système et la structure du bâtiment permet la circulation de l'air induite par la chaleur. L'émission thermique de ces systèmes peut être déterminée selon la série EN 14037 et l'EN 14240.
L'EN 1264-4 spécifie des exigences uniformes pour la conception et la mise en oeuvre des systèmes de surfaces chauffantes et rafraîchissantes intégrées dans le sol, les plafonds et les murs afin qu'ils répondent à leur destination.
Les exigences spécifiées dans la série EN 1264 s'appliquent uniquement aux composants des systèmes de chauffage/de rafraîchissement faisant partie du système de chauffage / de rafraîchissement. L'EN 1264-4 ne couvre pas les autres composants ne faisant pas partie du système de chauffage / de rafraîchissement.

Ploskovni sistemi za ogrevanje in hlajenje z vodo - 4. del: Vgradnja

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Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
19-May-2021
Completion Date
19-May-2021

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SLOVENSKI STANDARD
SIST EN 1264-4:2021
01-julij-2021
Nadomešča:
SIST EN 1264-4:2009
Ploskovni sistemi za ogrevanje in hlajenje z vodo - 4. del: Vgradnja
Water based surface embedded heating and cooling systems - Part 4: Installation
Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 4:
Installation

Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 4:

Installation
Ta slovenski standard je istoveten z: EN 1264-4:2021
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 1264-4:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 1264-4:2021
---------------------- Page: 2 ----------------------
SIST EN 1264-4:2021
EN 1264-4
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 91.140.10 Supersedes EN 1264-4:2009
English Version
Water based surface embedded heating and cooling
systems - Part 4: Installation

Systèmes de surfaces chauffantes et rafraîchissantes Raumflächenintegrierte Heiz- und Kühlsysteme mit

hydrauliques intégrées - Partie 4: Installation Wasserdurchströmung - Teil 4: Installation

This European Standard was approved by CEN on 12 April 2021.

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 CEN-CENELEC Management Centre 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 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1264-4:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)

Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Requirements ................................................................................................................................................... 6

4.1 Hydronic balancing ........................................................................................................................................ 6

4.2 Floor heating and cooling systems ............................................................................................................ 6

4.2.1 General structural preconditions .............................................................................................................. 6

4.2.2 Building layers, building components ..................................................................................................... 6

4.2.3 Leak test........................................................................................................................................................... 12

4.2.4 Initial heating up of the emission system ............................................................................................ 13

4.2.5 Heating up for readiness for covering .................................................................................................. 14

4.2.6 Floor coverings ............................................................................................................................................. 14

4.3 Heating and cooling systems embedded in ceilings and walls .................................................... 14

4.3.1 Preface ............................................................................................................................................................. 14

4.3.2 General structural preconditions ........................................................................................................... 14

4.3.3 Insulation ........................................................................................................................................................ 15

4.3.4 Maximum flow temperatures .................................................................................................................. 15

Annex A (informative) Corrosion Prevention ................................................................................................. 16

A.1 Oxygen Barrier Layer.................................................................................................................................. 16

A.2 Adoption of specific inhibitory products ............................................................................................. 16

Annex B (informative) Initial heating up protocol ........................................................................................ 17

Bibliography ................................................................................................................................................................. 19

---------------------- Page: 4 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)
European foreword

This document (EN 1264-4:2021) has been prepared by Technical Committee CEN/TC 130 “Space

heating appliances without integral heat sources”, the secretariat of which is held by UNI.

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 November 2021, and conflicting national standards

shall be withdrawn at the latest by November 2021.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 1264-4:2009.
The main changes compared to the previous edition are listed below:
a) Clarification of the Scope;
b) Improved wording, especially the term “prove method”;
c) Addition of a new subclause 4.1, Hydronic balancing;
d) Addition of a paragraph in 4.2.2.1, Supporting base;
e) Modification of 4.2.2.2, Insulating layers;
f) Addition of a new subclause 4.2.2.4, Other layers;
g) Modification of 4.2.2.9, Weight bearing layer;
h) Addition of a new subclause 4.2.2.9.5.4, Tubes damage;
i) Modification of 4.2.3, Leak test;
j) Modification of 4.2.4, Initial heat up of the emission system;
k) Addition of a new subclause 4.2.5, Heating up for readiness for covering;
l) Modification of 4.3.3 Insulation;
m) Addition of a new Annex B, Initial heating up protocol.

EN 1264, Water based surface embedded heating and cooling systems, consists of the following parts:

— Part 1: Definitions and symbols;

— Part 2: Floor heating: Methods for the determination of the thermal output using calculations and

experimental tests;
— Part 3: Dimensioning;
— Part 4: Installation;

— Part 5: Determination of the thermal output for wall and ceiling heating and for floor, wall and ceiling

cooling.
---------------------- Page: 5 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)
1 Scope

The EN 1264 series gives guidelines for surface embedded heating and cooling systems installed in

buildings, residential and non-residential (e.g. office, public, commercial and industrial buildings) and

focuses on systems installed for the purpose of thermal comfort.

The EN 1264 series gives guidelines for water based heating and cooling systems embedded into the

enclosure surfaces of the room to be heated or to be cooled. It also specifies the use of other heating

media instead of water, as appropriate.

The EN 1264 series specifies standardized product characteristics by calculation and testing the

thermal output of heating for technical specifications and certification. For the design, construction and

operation of these systems, see EN 1264-3 and EN 1264-4 for the types A, B, C, D, H, I and J. For the

types E, F and G, see the EN ISO 11855 series.

The systems specified in The EN 1264 series are adjoined to the structural base of the enclosure

surfaces of the building, mounted directly or with fixing supports. The EN 1264 series does not specify

ceiling systems mounted in a suspended ceiling with a designed open air gap between the system and

the building structure which allows the thermally induced circulation of the air. The thermal output of

these systems can be determined according to the EN 14037 series and EN 14240.

EN 1264-4 specifies uniform requirements for the design and the construction of heating and cooling

floor, ceiling and wall structures to ensure that the heating/cooling systems are suited to the particular

application.

The requirements specified by the EN 1264 series apply only to the components of the heating/cooling

systems which are part of the heating/cooling system. EN 1264-4 does not cover other elements which

are not part of the heating/cooling system.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1057:2006+A1:2010, Copper and copper alloys - Seamless, round copper tubes for water and gas in

sanitary and heating applications
EN 1254 (all parts), Copper and copper alloys - Plumbing fittings

EN 1264-1, Water based surface embedded heating and cooling systems - Part 1: Definitions and symbols

EN ISO 15874 (all parts), Plastics piping systems for hot and cold water installations - Polypropylene (PP)

EN ISO 15875 (all parts), Plastics piping systems for hot and cold water installations - Crosslinked

polyethylene (PE-X)

EN ISO 15876 (all parts), Plastics piping systems for hot and cold water installations - Polybutylene (PB)

EN ISO 15877 (all parts), Plastics piping systems for hot and cold water installations - Chlorinated

poly(vinyl chloride) (PVC-C)

EN ISO 21003 (all parts), Multilayer piping systems for hot and cold water installations inside buildings

ISO 10508, Plastics piping systems for hot and cold water installations - Guidance for classification and

design
---------------------- Page: 7 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)

ISO 11855-6:2018, Building environment design - Design, dimensioning, installation and control of

embedded radiant heating and cooling systems - Part 6: Control

ISO 22391 (all parts), Plastics piping systems for hot and cold water installations - Polyethylene of raised

temperature resistance (PE-RT)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1264-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Requirements
4.1 Hydronic balancing

According to ISO 11855-6:2018, 4.8, water based heating and cooling systems shall have a hydronic

balancing. The components shall be adjusted in order to ensure the required flow rates. Under dynamic

conditions, e.g. during the heating up period, it shall be ensured that the hydraulic interaction between

the different heating circuits is small. The flow rates in the different circuits should not be greater than

the design flow rates.
Each circuit shall have a balancing device or balancing system.

The balance of the system shall be done according to the realized project, e.g. “as build”, because the

length of circuits realized can differ from the project, therefore once the system has been installed, the

flow rates shall be updated and then set on the manifold.

Depending on the situation of the heating and cooling system the distribution system shall be equipped

with facilities for degassing and sludge separation.
4.2 Floor heating and cooling systems
4.2.1 General structural preconditions

The installation of a water floor heating and/or cooling system shall follow the prior installation of any

electrical, sanitary and other pipe facilities. The structure as specified in 4.2.2.1 with the draught-free

closure of all building openings, e.g. windows and outer doors, shall be completed.

4.2.2 Building layers, building components
4.2.2.1 Supporting base
The supporting base shall be prepared in accordance with relevant standards.

Any pipe work or conduits shall be fixed and encased to provide a level base upon which thermal

insulation and/or acoustic insulation is added before laying the heating pipes. In this respect, the

necessary structural height shall be taken into account.

In the case of service pipes installed within the insulation layer, these pipes shall be protected against

temperature change. Any existing National Regulations on this topic should be taken into consideration.

If the external doors and windows are not present before the installation of the system, it is

recommended to close all windows holes, even with provisional systems (in order to avoid too

high/low temperatures and to limit the effect of the speed of the air). Walls plaster shall be completed.

---------------------- Page: 8 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)
4.2.2.2 Insulating layer

In the case of floor heating and cooling systems, as a rule the thermal resistance R is provided by

λ,ins

the insulation layers which are integral parts of the system; on this topic, national rules should be

consulted.

The thermal resistance R of the insulating layer of the heating/cooling system is specified in

λ,ins

Table 1. For renovation systems, R may be determined taking into account the effective thermal

λ,ins
resistance of the building structure including insulation layers.
These requirements are for heating and cooling systems.

Table 1 — System Insulation — Minimum heat conduction resistance of system-insulating layers

below the pipes of heating/cooling systems
Heated Unheated or External air temperature below or adjacent
room intermittent
External External design External design
below or heated room
design temperature temperature
adjacent below, adjacent
temperature
or directly on the
ϑ ≥ 0 °C 0 °C > ϑ ≥ −5 °C −5 °C > ϑ ≥ −15 °C
ground
d d d
Heat
conduction
resistance
0,75 1,25 1,25 1,50 2,00
λ,ins
(m ∙K)/W

with ground water level ≤ 5 m below the supporting base, the value should be increased.

NOTE Insulation are not vapour barrier.

When installing the system-insulating layer, the insulating panels shall be butted tightly together.

Multiple insulating layers shall be staggered or placed in such a way that the joints between panels of

one layer are out of line with the next layer.

Prior to the laying of the screed, a peripheral insulating strip (edge joint) shall be placed along the walls

and other building components penetrating the screed and firmly secured to the supporting base, e.g.

door frames, pillars and risers.

The peripheral insulating strip shall rise from the supporting base up to the surface of the finished floor

and permit a movement of the screed of at least 5 mm.

In the case of multiple insulating layers, the peripheral insulating strip shall be placed prior to

application of the upper insulating layer. When laying the screed, the peripheral insulating strip shall be

secured against any change in position. The top part of the peripheral insulating strip which rises over

the finished floor shall not be cut off until completion of the floor covering and, in the case of textile and

plastic coverings, hardening of the filler.
---------------------- Page: 9 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)
4.2.2.3 Protective layer

Prior to laying the screed, the insulation layer shall be covered with a protective layer consisting of a

plastic film of at least 0,15 mm thickness, with a minimum of 80 mm overlaps, or with another product

of equivalent function. The protective layer shall be turned pulled up above the upper edge of the

peripheral insulating strip unless the strip itself fulfils the function of protection. The peripheral

insulating strip shall be firmly secured to the insulating layer or to the protective layer to avoid the

infiltration of the liquid screed.

When using synthetic resin screeds or calcium sulfate screeds, the protective layer of the insulating

layer shall be liquid-tight by for instance being stuck or welded together.

When using asphalt screeds, also a therefore suitable protective layer shall be applied, but in this case,

liquid tightness is not necessary.
Protective layers are not moisture barriers.
4.2.2.4 Other layers

If other layers (such as acoustic insulation layers) are included and they have an influence on the

thermal output, they have to be taken into account in the thermal performance calculation.

4.2.2.5 Equipment
4.2.2.5.1 Safety

For heating systems, a safety device, independent of the control unit, and which operates even in the

absence of electric power, shall cut off the heat supply in the floor heating circuit. For cooling systems,

the control system shall prevent condensation with interruption of flow rate or increase in flow

temperature.
4.2.2.5.2 Manifolds

The central manifold of the piping system shall be placed in such a manner to get the shortest flow

pipes. Otherwise, the flow pipes can have an unwanted impact on the control of the room temperature.

At least one circuit per heated/cooled room shall be installed in order to permit temperature control

either manual or automatic.
4.2.2.5.3 Stop valves and balancing devices

Each circuit shall have two stop valves and one balancing device or balancing system.

4.2.2.6 Piping (pipes and couplings)
4.2.2.6.1 Plastic piping
Requirements for plastic pipes shall comply with the following standards:
PE-X EN ISO 15875 (all parts)
PB EN ISO 15876 (all parts)
PP EN ISO 15874 (all parts)
PVC-C EN ISO 15877 (all parts)
Multilayer Piping Systems EN ISO 21003 (all parts)
PE-RT Systems ISO 22391 (all parts)
---------------------- Page: 10 ----------------------
SIST EN 1264-4:2021
EN 1264-4:2021 (E)

Calculate the minimum wall thickness in accordance with the following conditions:

a) Service conditions: Class 4 in accordance with ISO 10508;
b) Operating pressure: = 4 bar;
c) Lifetime = 50 years.

It is recommended to use pipes with an oxygen-barrier layer in conformity with Annex A. Precautions

shall be taken to protect the system again
...

SLOVENSKI STANDARD
oSIST prEN 1264-4:2020
01-januar-2020
Ploskovni sistemi za ogrevanje in hlajenje z vodo - 4. del: Vgradnja
Water based surface embedded heating and cooling systems - Part 4: Installation
Raumflächenintegrierte Heiz- und Kühlsysteme mit Wasserdurchströmung - Teil 4:
Installation

Systèmes de surfaces chauffantes et rafraîchissantes hydrauliques intégrées - Partie 4:

Installation
Ta slovenski standard je istoveten z: prEN 1264-4
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
oSIST prEN 1264-4:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 1264-4:2020
---------------------- Page: 2 ----------------------
oSIST prEN 1264-4:2020
DRAFT
EUROPEAN STANDARD
prEN 1264-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2020
ICS 91.140.10 Will supersede EN 1264-4:2009
English Version
Water based surface embedded heating and cooling
systems - Part 4: Installation

Systèmes de surfaces chauffantes et rafraîchissantes Raumflächenintegrierte Heiz- und Kühlsysteme mit

hydrauliques intégrées - Partie 4: Installation Wasserdurchströmung - Teil 4: Installation

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 130.

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, Republic of North Macedonia, Romania, Serbia, 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
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1264-4:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 1264-4:2020
prEN 1264-4:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 5

4 Requirements ................................................................................................................................................... 5

4.1 Hydronic balancing ........................................................................................................................................ 5

4.2 Floor heating and cooling systems ............................................................................................................ 5

4.2.1 General structural preconditions .............................................................................................................. 5

4.2.2 Building layers, building components ..................................................................................................... 5

4.2.3 Leak test........................................................................................................................................................... 10

4.2.4 Initial heating up .......................................................................................................................................... 11

Water design temperature ...................................................................................................................................... 11

4.2.5 Heating up for readiness for covering .................................................................................................. 11

4.2.6 Floor coverings ............................................................................................................................................. 12

4.3 Heating and cooling systems embedded in ceilings and walls .................................................... 12

4.3.1 Preface ............................................................................................................................................................. 12

4.3.2 General structural preconditions ........................................................................................................... 12

4.3.3 Insulation ........................................................................................................................................................ 13

4.3.4 Maximum flow temperatures .................................................................................................................. 13

Annex A (informative) Corrosion Prevention ................................................................................................. 14

A.1 Oxygen Barrier Layer.................................................................................................................................. 14

A.2 Adoption of specific inhibitory products ............................................................................................. 14

Annex B (informative) Initial heating up protocol ........................................................................................ 15

Bibliography ................................................................................................................................................................. 17

---------------------- Page: 4 ----------------------
oSIST prEN 1264-4:2020
prEN 1264-4:2020 (E)
European foreword

This document (prEN 1264-4:2019) has been prepared by Technical Committee CEN/TC 130 “Space

heating appliances without integral heat sources”, the secretariat of which is held by UNI.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1264-4:2009.

This document, Water based surface embedded heating and cooling systems, consists of the following

parts:
— Part 1: Definitions and symbols;

— Part 2: Floor heating: Methods for the determination of the thermal output using calculations and

experimental tests;
— Part 3: Dimensioning;
— Part 4: Installation;

— Part 5: Determination of the thermal output for wall and ceiling heating and for floor, wall and ceiling

cooling.
The main changes with respect to the previous edition are listed below:
a) Clarified the scope;
b) Improved wording, especially the term “prove method”;
c) Added a new subclause 4.1 Hydronic balancing;
d) Added a paragraph in 4.2.2.1 Supporting base;
e) Modified 4.2.2.2 Insulating layers;
f) Added a new subclause 4.2.2.4 Other layers;
g) Modified 4.2.2.9 Weight bearing layer;
h) Added a new subclause 4.2.2.9.5.4 Tubes damage;
i) Modified 4.2.3 Leak test;
j) Modified 4.2.4 Initial heat up;
k) Added a new Annex B Initial heating up protocol;
l) Added a new subclause 4.2.5 Heating up for readiness for covering;
m) Modified 4.3.3 Insulation;
n) Improved wording.
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1 Scope

EN 1264 covers surface embedded heating and cooling systems installed in buildings, residential and

non-residential (e.g. office, public, commercial and industrial buildings) and focuses on systems

installed for the purpose of thermal comfort.

EN 1264 applies to water based heating and cooling systems embedded into the enclosure surfaces of

the room to be heated or to be cooled. It also applies as appropriate to the use of other heating media

instead of water.

EN 1264 applies to identify standardized product characteristics by calculation and testing the thermal

output of heating for technical specifications and certification. For the design, construction and

operation of these systems, EN ISO 11855 applies.

The systems covered in EN 1264 are adjoined to the structural base of the enclosure surfaces of the

building, mounted directly or with fixing supports. It does not cover ceiling systems mounted in a

suspended ceiling with a designed open air gap between the system and the building structure which

allows the thermally induced circulation of the air. The thermal output of these systems can be

determined according to ISO 18566, EN 14037 and EN 14240.

EN 1264-4 specifies uniform requirements for the design and the construction of heating and cooling

floor, ceiling and wall structures to ensure that the heating/cooling systems are suited to the particular

application.

The requirements specified by EN 1264 apply only to the components of the heating/cooling systems

which are part of the heating/cooling system. EN 1264-4 does not cover all other elements which are

not part of the heating/cooling system.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1057:2006+A1:2010, Copper and copper alloys — Seamless, round copper tubes for water and gas in

sanitary and heating applications
EN 1254 (all parts), Copper and copper alloys — Plumbing fittings

EN 1264-1, Water based surface embedded heating and cooling systems - Part 1: Definitions and symbols

EN ISO 11855, Building environment design — Design, dimensioning, installation and control of

embedded radiant heating and cooling systems

EN ISO 15874 (all parts), Plastics piping systems for hot and cold water installations

EN ISO 15875 (all parts), Plastics piping systems for hot and cold water installations — Crosslinked

polyethylene (PE-X)

EN ISO 15876 (all parts), Plastics piping systems for hot and cold water installations — Polybutylene (PB)

EN ISO 15877 (all parts), Plastics piping systems for hot and cold water installations — Chlorinated

poly(vinyl chloride) (PVC-C)

EN ISO 21003 (all parts), Multilayer piping systems for hot and cold water installations inside buildings

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ISO 10508, Plastics piping systems for hot and cold water installations — Guidance for classification and

design

ISO 22391 (all parts), Plastics piping systems for hot and cold water installations — Polyethylene of raised

temperature resistance (PE-RT)

DIN 4724, Kunststoff-Rohrleitungssysteme für Warmwasserheizung und Heizkörperanbindung —

Vernetztes Polyethylen mittlerer Dichte (PE-MDX)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1264-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Requirements
4.1 Hydronic balancing

According to ISO 11855-6:2018, 4.8, water based heating and cooling systems shall have a hydronic

balancing. The components shall be adjusted in order to ensure the required flow rates. Under dynamic

conditions, e.g. during the heating up period, it shall be ensured that the hydraulic interaction between

the different heating circuits is small (the flow rates in the different circuits should not be greater than

the design flow rates). Depending on the situation of the heating system the floor heating distribution

system shall be equipped with facilities for degassing and sludge separation.
Each circuit shall have a balancing device.

The balance of the system shall be done according to the realized project, e.g. “as build”, because the

length of circuits realized can differ from the project, therefore once the system has been installed, the

flow rates shall be updated and then set on the manifold.
4.2 Floor heating and cooling systems
4.2.1 General structural preconditions

The installation of a hot water floor heating and/or cooling system shall follow the prior installation of

any electrical, sanitary and other pipe facilities. The structure as specified in 4.1.2.1 with the draught-

free closure of all building openings, e.g. windows and outer doors, shall be completed.

4.2.2 Building layers, building components
4.2.2.1 Supporting base
The supporting base shall be prepared in accordance with relevant standards.

Any pipe work or conduits shall be fixed and encased to provide a level base upon which thermal

insulation and/or acoustic insulation is added before laying the heating pipes. In this respect, the

necessary structural height shall be taken into account.

In the case of service pipes installed within the insulation layer, these pipes shall be protected against

temperature change in accordance with National Regulations.
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If the external doors and windows are not present before the installation of the system, it is

recommended to close all windows holes, even with provisional systems (in order to avoid too

high/low temperatures and to limit the effect of the speed of the air). Walls plaster shall be completed.

4.2.2.2 Insulating layer

In the case of floor heating and cooling systems, as a rule the thermal resistance R is provided by

λ,ins

the insulation layers which are integral parts of the system; on this topic, national rules shall be

consulted.

The resistance R of the insulating layer of the heating/cooling system is specified in Table 1. These

λ,ins
requirements are for heating and cooling systems.

Table 1 — System Insulation — Minimum heat conduction resistance of system-insulating layers

below the pipes of heating/cooling systems (m ∙K)/W
heated Unheated or external air temperature below or adjacent
room intermittent
external external external design
below or heated room
design design temperature
adjacent below, adjacent
temperature temperature
or directly on the
0 °C > ϑ ≥ −5 °
ground
ϑ ≥ 0 °C −5 °C > ϑ ≥ −15 °C
d d
heat
conduction
0,75 1,25 1,25 1,50 2,00
resistance
λ,ins

with ground water level ≤ 5 m below the supporting base, the value should be increased.

NOTE Insulation are not vapour barrier.

When installing the system-insulating layer, the insulating panels shall be butted tightly together.

Multiple insulating layers shall be staggered or placed in such a way that the joints between panels of

one layer are out of line with the next layer.

Prior to the laying of the screed, a peripheral insulating strip (edge joint) shall be placed along the walls

and other building components penetrating the screed and firmly secured to the supporting base, e.g.

door frames, pillars and risers.

The peripheral insulating strip shall rise from the supporting base up to the surface of the finished floor

and permit a movement of the screed of at least 5 mm.

In the case of multiple insulating layers, the peripheral insulating strip shall be placed prior to

application of the upper insulating layer. When laying the screed, the peripheral insulating strip shall be

secured against any change in position. The top part of the peripheral insulating strip which rises over

the finished floor shall not be cut off until completion of the floor covering and, in the case of textile and

plastic coverings, hardening of the filler.
4.2.2.3 Protective layer

Prior to laying the screed, the insulation layer shall be covered with a protective layer consisting of a

polyethylene film of at least 0,15 mm thickness, with a minimum of 80 mm overlaps, or with another

product of equivalent function.

In accordance with 4.1.2.2.2, the protective layer shall be turned pulled up above the upper edge of the

peripheral insulating strip unless the strip itself fulfils the function of protection. The peripheral

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insulating strip shall be firmly secured to the insulating layer or to the protective layer to avoid the

infiltration of the liquid screed.

When using synthetic resin screeds or calcium sulphate screeds, the protective layer of the insulating

layer shall be liquid-tight by for instance being stuck or welded together.

When using gush asphalt screeds, also a therefore suitable protective layer shall be applied, but in this

case, liquid tightness is not necessary.
Protective layers are not humidity barriers.
4.2.2.4 Other layers

If other layers (such as acoustic insulation layers) are included and they have an influence on the

thermal output, they have to be taken into account in the thermal performance calculation.

4.2.2.5 Equipment
4.2.2.5.1 Safety

For heating systems, a safety device, independent of the control unit, and which operates even in the

absence of electric power, shall cut off the heat supply in the floor heating circuit in such a way that the

temperature around the heating elements does not exceed the data given in 4.1.2.8.2. For cooling

systems, the control system shall prevent condensation with interruption of flow rate or increase in

flow temperature.
4.2.2.5.2 Manifolds

The central manifold of the piping system shall be placed in such a manner to get the shortest flow

pipes. Otherwise, the flow pipes can have an unwanted impact on the control of the room temperature.

4.2.2.5.3 Stop valves

Each circuit shall have two stop valves. At least one circuit per heated/cooled room shall be installed in

order to permit temperature control either manual or automatic.
4.2.2.6 Piping (pipes and couplings)
4.2.2.6.1 Plastic piping
Requirements for plastic pipes shall comply with the following Standards:
PE-X EN ISO 15875 (parts −1, −2, −3 and −5)
PB EN ISO 15876 (parts −1, −2, −3 and −5)
PP EN ISO 15874 (parts −1, −2, −3 and −5)
PVC-C EN ISO 15877 (parts −1, −2, −3 and −5)
Multilayer Piping Systems EN ISO 21003 (parts −1, −2, −3 and −5)
PE-RT Systems ISO 22391 (parts −1, −2, −3 and −5)
PE-MDX DIN 4724

Calculate the minimum wall thickness in accordance with the following conditions:

a) Service conditions: Class 4 in accordance with ISO 10508;
b) Operating pressure: ≥ 4 bar;
c) Lifetime = 50 years.
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It is recommended to use pipes with an oxygen-barrier layer in conformity with Annex A. Precautions

shall be taken to protect the system against corrosion.

In the case of junction of the circuit, or repair of tubes the technical information of the manufacturer

should be followed.
4.2.2.6.2 Copper piping

Copper piping shall comply with the requirements of EN 1057 (pipes) and EN 1254 series(fittings).The

preferred temper is annealed R220 (see EN 1057:2010, Clause 4).
4.2.2.7 Installation of piping
4.2.2.7.1 Storage and transport
The pipes shall be transported, stored and handled in such a way as to be:
a) protected from anything which could damage them;
b) for plastic pipes stored out of direct sunlight.
4.2.2.7.2 Clearance area
The pipes are placed more than:
...

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