SIST EN 257:2022+A1:2024
(Main + Amendment)Mechanical thermostats for gas-burning appliances
Mechanical thermostats for gas-burning appliances
EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:2019, Clause 1 is replaced by:
This document specifies the safety, design, construction, and performance requirements and testing for
mechanical thermostats intended for use with gas appliances and similar use, hereafter referred to as
“thermostats”.
This document is applicable to thermostats with declared maximum inlet pressures up to and including
50 kPa and of nominal connection sizes up to and including DN 50 for use with one or more fuel gases.
Addition:
This document is applicable to thermostats controlling the gas flow directly or indirectly through an
integral gas valve. This document applies to thermostats used with gas appliances which are not installed
in the open air.
Thermostats dealt with in this document are intended for control functions.
This document is not applicable to:
a) controls which use auxiliary energy (e.g. electrical energy supplied externally);
b) an assessment of the control regarding Performance Level (PL) and Safety Integrity Level (SIL).
The 4th paragraph of EN 13611:2019, Clause 1 is removed.
Mechanische Temperaturregler für Gasgeräte
EN 13611:2019, Abschnitt 1, gilt mit folgender Änderung und Ergänzung:
Änderung:
Der erste Absatz von EN 13611:2019, Abschnitt 1, wird ersetzt durch:
Dieses Dokument legt die Sicherheits-, Auslegungs-, Konstruktions- und Leistungsanforderungen sowie die Prüfung von mechanischen Temperaturreglern fest, im Folgenden als „Temperaturregler“ bezeichnet, die für die Verwendung mit Gasgeräten und ähnliche Verwendungszwecke vorgesehen sind.
Dieses Dokument gilt für Temperaturregler mit einem angegebenen höchsten Eingangsdruck bis einschließlich 50 kPa mit Anschlussnennweiten bis einschließlich DN 50 für die Verwendung mit einem oder mehreren Brenngasen.
Ergänzung:
Dieses Dokument gilt für Temperaturregler, die den Gasstrom direkt oder indirekt durch ein eingebautes Gasventil steuern. Dieses Dokument gilt für Temperaturregler, die in Gasgeräten verwendet werden, die nicht im Freien aufgestellt sind.
Die im vorliegenden Dokument behandelten Temperaturregler sind für Regel- und Steuerfunktionen vorgesehen.
Dieses Dokument gilt nicht für:
a) Regel- und Steuergeräte mit Hilfsenergie (z. B. externe Stromversorgung);
b) eine Bewertung des Regel- und Steuergeräts hinsichtlich Performance Level (PL) und Sicherheits-Integritätslevel (SIL).
Der vierte Absatz von EN 13611:2019, Abschnitt 1, entfällt.
Thermostats mécaniques pour appareils à gaz
Mehanski termostati za plinske aparate (vključno z dopolnilom A1)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2024
Nadomešča:
SIST EN 257:2022
Mehanski termostati za plinske aparate (vključno z dopolnilom A1)
Mechanical thermostats for gas-burning appliances
Mechanische Temperaturregler für Gasgeräte
Thermostats mécaniques pour appareils à gaz
Ta slovenski standard je istoveten z: EN 257:2022+A1:2023
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 257:2022+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 27.060.20 Supersedes EN 257:2022
English Version
Mechanical thermostats for gas-burning appliances
Thermostats mécaniques pour appareils à gaz Mechanische Temperaturregler für Gasgeräte
This European Standard was approved by CEN on 8 August 2022 and includes Amendment approved by CEN on 11 October
2023.
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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 257:2022+A1:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Classification . 10
4.1 Classes of control . 10
4.2 Groups of control. 10
4.3 Classes of control functions . 10
4.4 Types of DC supplied controls . 11
5 Test conditions and uncertainty of measurements . 11
6 Design and construction . 11
6.1 General . 11
6.2 Mechanical parts of the control . 11
6.2.1 Appearance . 11
6.2.2 Holes . 11
6.2.3 Breather holes . 11
6.2.4 Screwed fastenings . 11
6.2.5 Jointing . 11
6.2.6 Moving parts . 11
6.2.7 Sealing caps . 11
6.2.8 Dismantling and reassembly . 11
6.2.9 Auxiliary canals and orifices . 11
6.2.10 Presetting device . 11
6.3 Materials. 12
6.4 Gas connections . 12
6.5 Electrical parts of the control . 12
6.6 Protection against internal faults for the purpose of functional safety . 12
6.101 Flow characteristics . 12
6.102 Temperature adjustment . 12
6.102.1 Range adjustment . 12
6.102.2 Set-point adjustment . 12
6.102.3 Fixed setting thermostat . 12
7 Performance . 13
7.1 General . 13
7.1.101 Sequence of testing . 13
7.2 Leak-tightness . 14
7.2.1 Requirements . 14
7.2.2 Tests . 14
7.3 Torsion and bending . 14
7.4 Rated flow rate . 14
7.4.1 Requirement . 14
7.4.2 Test . 15
7.4.3 Conversion of air flow rate . 15
7.5 Durability . 15
7.6 Performance tests for electronic controls . 15
7.7 Long-term performance for electronic controls . 15
7.8 Data exchange . 15
7.101 Calibration temperature set-point . 15
7.101.1 Requirement. 15
7.101.2 Test . 15
7.102 Backlash . 15
7.102.1 Requirement. 15
7.102.2 Test . 15
7.103 Opening of a snap-acting thermostat with a closed position . 16
7.103.1 Requirement. 16
7.103.2 Test . 16
7.104 Opening pressure and closing pressure for thermostats with a closed position . 16
7.104.1 Requirement. 16
7.104.2 Test . 16
7.105 Operating characteristic of the thermostat . 16
7.105.1 Requirement. 16
7.105.2 Test . 17
7.106 Ambient temperature range of the body . 20
7.106.1 Requirement. 20
7.106.2 Test . 20
7.107 Effect of storage and transport temperatures. 21
7.107.1 Requirement. 21
7.107.2 Test . 21
7.108 Thermal overload of the temperature sensor. 21
7.108.1 Requirement. 21
7.108.2 Test . 21
7.109 Operating torque of the thermostat set-point adjuster . 21
7.109.1 Requirement. 21
7.109.2 Test . 21
7.110 Endurance . 22
7.110.1 Requirement. 22
7.110.2 Tests .
...
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