EN 1434-6:2022

SLOVENSKI STANDARD
01-november-2022
Nadomešča:
SIST EN 1434-6:2016+A1:2019
Merilniki toplote - 6. del: Vgradnja, zagon, nadzor in vzdrževanje
Thermal energy meters - Part 6: Installation, commissioning, operational monitoring and
maintenance
Thermische Energiemessgeräte - Teil 6: Einbau, Inbetriebnahme, Überwachung und
Wartung
Compteurs d'énergie thermique - Partie 6 : Installation, mise en service, surveillance et
maintenance
Ta slovenski standard je istoveten z: EN 1434-6:2022
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1434-6
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 17.200.20 Supersedes EN 1434-6:2015+A1:2019
English Version
Thermal energy meters - Part 6: Installation,
commissioning, operational monitoring and maintenance
Compteurs d'énergie thermique - Partie 6 : Installation, Thermische Energiemessgeräte - Teil 6: Einbau,
mise en service, surveillance et maintenance Inbetriebnahme, Überwachung und Wartung
This European Standard was approved by CEN on 17 July 2022.

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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1434-6:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 6
4.1 Design requirements . 6
4.2 Installation requirements. 8
4.3 Thermal energy meter commissioning . 8
4.3.1 General . 8
4.3.2 Certification check . 9
4.3.3 Installation check . 9
4.3.4 Thermal energy meter security . 9
4.4 Operating requirements with heat-conveying liquids other than water . 10
Annex A (informative) Thermal energy meter installation . 11
A.1 General . 11
A.2 Criteria for the selection of a thermal energy meter . 11
A.3 Quality of the heat conveying liquid . 12
A.3.1 General . 12
A.3.2 Primary water quality . 12
A.3.3 Secondary water quality. 12
A.3.4 Monitoring heat conveying liquids other than water . 12
A.4 Thermal energy meter flow circuit design . 14
A.5 Additional recommendations for cooling application . 15
A.6 Examples for the installation of thermal energy meters . 15
A.7 Additional recommendations for large pipes > DN 250 . 21
Annex B (informative) Thermal energy meter operational monitoring and maintenance . 23
B.1 Introduction . 23
B.2 Thermal energy meter service life . 23
B.3 Thermal energy meter monitoring procedures . 23
B.4 Maintenance check list . 24
B.5 Replacement of failed thermal energy meters . 24
Annex C (informative) Suggested gauge for checking the dimensions of installed
temperature sensor pockets . 26
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/32/EU aimed to be covered . 27
Bibliography. 28
European foreword
This document (EN 1434-6:2022) has been prepared by Technical Committee CEN/TC 176 “Thermal
energy meters”, the secretariat of which is held by SIS.
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 March 2023, and conflicting national standards shall
be withdrawn at the latest by March 2023.
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 1434-6:2015+A1:2019.
EN 1434, Thermal energy meters, consists of the following parts:
— Part 1: General requirements;
— Part 2: Constructional requirements;
— Part 3: Data exchange and interfaces ;
— Part 4: Pattern approval tests;
— Part 5: Initial verification tests;
— Part 6: Installation, commissioning, operational monitoring and maintenance.
In comparison with EN 1434-6:2015+A1:2019, the following changes have been made:
— the title of this standard has been changed into “Thermal energy meters”;
— Annex ZA has been adjusted to the new Directive 2014/32/EU (MID);
— wording “heat meter” has been partly and where applicable changed into “thermal energy meter”
within the whole document;
— new clauses have been inserted: 4.1.4, 4.1.5, 4.4, A.3.4, 3.7.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral
part of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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,

EN 1434-3 is maintained by CEN/TC 294.
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, Türkiye and the
United Kingdom.
1 Scope
This document specifies commissioning, operational monitoring and maintenance and applies to
thermal energy meters. Thermal energy meters are instruments intended for measuring the energy
which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-
conveying liquid. The thermal energy meter indicates the quantity of thermal energy in legal units.
This document covers meters for closed systems only, where the differential pressure over the thermal
load is limited.
This document is not applicable to:
— electrical safety requirements;
— pressure safety requirements; and
— surface mounted temperature sensors.
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 1434-1:2022, Thermal energy meters — Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1434-1:2022 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
thermal energy system
heating or cooling installations of the dwelling or premises, including the exchange circuit, the thermal
energy meter, the associated fittings and the electrical equipment
Note 1 to entry: The heating or cooling systems typically commences and finishes at the two connections to the
heat or cooling mains.
3.2
thermal energy mains
heat or cooling supplier’s distribution pipes to which the consumer's installation is connected
3.3
inlet and outlet limbs
pipes connecting the heating or cooling system to the thermal energy mains
3.4
primary circuit
circuit hydraulically connected to the thermal energy mains
3.5
secondary circuit
circuit hydraulically separated from the primary circuit
3.6
competent authority
persons or organizations charged with the responsibility for the thermal energy meter and/or its
installation
3.7
cooling system
cooling installation of an apartment or building, including cooling exchanger circuit, cooling meter,
accessories and electrical equipment
Note 1 to entry: The cooling system usually starts and ends at the two connections to the cooling distribution
network.
4 Requirements
4.1 Design requirements
4.1.1 When designing the heating and cooling system, the thermal energy meter's manufacturer
specification and installation instructions shall be followed. The design shall make monitoring and
maintenance possible. An example is given in Annex B.
For q 6 m /h and less, it is recommended to use direct short sensors. To achieve good temperature
p
sensitivity, direct sensors should be installed without temperature pockets. Temperature pockets
should only be used when required for safety reasons.
These installation points shall be insulated in accordance with the applicable legal regulations or other
technical measures shall be taken to reduce dissipation errors.
4.1.2 To avoid systematic measurement errors, the temperature sensors in the supply and return
pipes shall be used at almost identical pressure conditions.
For typical systematic negative error as a function of differential pressure and temperature difference,
see Table 1. Table 1 is only applicable to the medium water.
Table 1 — Typical systematic negative error as a function of differential pressu
...