EN 257:2010
(Main)Mechanical thermostats for gas-burning appliances
Mechanical thermostats for gas-burning appliances
This European Standard specifies the safety, construction and performance requirements for mechanical thermostats intended for use with gas appliances and similar use, hereafter referred to as ‘thermostats’.
This European Standard applies to thermostats with declared maximum inlet pressures up to and including
50 kPa (500 mbar) of nominal connection sizes up to and including DN 50 for use with one or more fuel gases in accordance with EN 437.
This European Standard applies to thermostats controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation.
This European Standard only applies to thermostats used with gas appliances which are not installed in the open air.
Thermostats dealt with in this European Standard are intended for control functions.
Mechanische Temperaturregler für Gasgeräte
Diese Europäische Norm legt die Anforderungen an die Sicherheit, konstruktive Ausführung und Funktion von
mechanischen Temperaturreglern fest, im Folgenden als „Temperaturregler“ bezeichnet, die für die Ver-
wendung mit Gasgeräten und ähnliche Verwendungszwecke vorgesehen sind.
Diese Europäische Norm gilt für Temperaturregler mit Nenn-Anschlussmaßen bis einschließlich DN 50 mit einem höchsten angegebenen Eingangsdruck bis einschließlich 50 kPa (500 mbar) für die Verwendung mit einem oder mehreren Brenngasen nach EN 437.
Diese Europäische Norm gilt für Temperaturregler, die den Gasstrom direkt oder indirekt durch ein einge-
bautes Gasventil steuern und für deren Betrieb keine äußere elektrische Energie erforderlich ist.
Diese Europäische Norm gilt nur für Temperaturregler, die in Gasgeräten verwendet werden, die nicht im Freien aufgestellt sind.
Die in der vorliegenden Norm behandelten Temperaturregler sind für Regel- und Steuerfunktionen vorge-
sehen.
Thermostats mécaniques pour appareils à gaz
La présente Norme européenne spécifie les caractéristiques de sécurité, de construction et de fonctionnement des thermostats mécaniques équipant les appareils d’utilisation des combustibles gazeux et utilisation similaire, ci-après désignés « thermostats ».
La présente Norme européenne s’applique aux thermostats de pression amont maximale déclarée inférieure ou égale à 50 kPa (500 mbar), de diamètre nominal de raccordement inférieur ou égal à DN 50 et utilisés avec un ou plusieurs combustibles gazeux en accord avec l’EN 437.
La présente Norme européenne s’applique aux thermostats qui contrôlent l’écoulement du gaz directement ou indirectement au moyen d’une vanne de gaz intégrée et ne recourent pas à une énergie électrique extérieure pour leur fonctionnement.
Cette norme européenne s’applique seulement aux thermostats utilisés sur des appareils à gaz qui ne sont pas installés à l’air libre.
Les thermostats visés par la présente norme assurent des fonctions de régulation.
Mehanski termostati za plinske aparate
Ta evropski standard določa zahteve za varnost, konstrukcijo in delovanje mehanskih termostatov, namenjenih za uporabo s plinskimi aparati in za podobno uporabo, v nadaljevanju »termostati«. Ta evropski standard velja za termostate z nazivnimi maksimalnimi vhodnimi tlaki do in vključno 50 kPa (500 mbar), nazivnih velikosti priključkov do in vključno DN 50, za uporabo z enim ali več kurilnih plinov v skladu z EN 437. Ta evropski standard velja za termostate, ki nadzorujejo pretok plina neposredno ali posredno preko vgrajenega plinskega ventila in ki ne potrebujejo zunanje električne energije za svoje delovanje. Ta evropski standard velja zgolj za termostate, ki se uporabljajo z plinskimi aparati, ki niso vgrajeni na prostem. Termostati, ki jih obravnava ta evropski standard, so namenjeni za nadzorne funkcije.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mehanski termostati za plinske aparateMechanische Temperaturregler für GasgeräteRobinets automatiques de sectionnement pour brûleurs à gaz et appareils à gazMechanical thermostats for gas-burning appliances27.060.20Plinski gorilnikiGas fuel burners17.200.20Instrumenti za merjenje temperatureTemperature-measuring instrumentsICS:Ta slovenski standard je istoveten z:EN 257:2010SIST EN 257:2010en,fr,de01-november-2010SIST EN 257:2010SLOVENSKI
STANDARDSIST EN 257:1997/A1:1997SIST EN 257:19971DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 257
June 2010 ICS 27.060.20 Supersedes EN 257:1992English 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 19 May 2010.
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 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 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, 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 worldwide for CEN national Members. Ref. No. EN 257:2010: ESIST EN 257:2010
Gas connections in common use in the various countries . 23Annex B (informative)
Leak-tightness test — volumetric method . 24Annex C (informative)
Leak-tightness test — pressure loss method . 25Annex D (normative)
Conversion of pressure loss into leakage rate . 26Annex E (normative)
Electrical/electronic component fault modes . 27Annex F (normative)
Additional requirements for safety accessories and pressure accessories as defined in EU Directive 97/23/EC. 28Annex G (normative)
Materials for pressurized parts . 29Annex H (informative)
Additional materials for pressurized parts . 30Annex I (normative)
Requirements for controls used in DC supplied gas burners and gas burning appliances . 31Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous fuels . 32Bibliography . 34 SIST EN 257:2010
Tables Table 1 — Sequence of testing . 10Table 2 — Maximum leakage rates . 12Table 3 — Exceptions for thermal overload . 18Table 4 — Number of mechanical cycles . 20Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to appliances burning gaseous fuels . 32 SIST EN 257:2010
50 kPa (500 mbar) of nominal connection sizes up to and including DN 50 for use with one or more fuel gases in accordance with EN 437. This European Standard applies to thermostats controlling the gas flow directly or indirectly through an integral gas valve, and which do not require external electrical energy for their operation. This European Standard only applies to thermostats used with gas appliances which are not installed in the open air. Thermostats dealt with in this European Standard are intended for control functions. 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 13611:2007, Safety and control devices for gas burners and gas-burning appliances — General require-ments 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007 and the following apply. 3.101 mechanical thermostat thermostat which controls the temperature by adjusting the flow rate accordingly to the temperature of the sensor without any external energy, such that the temperature remains within defined limits 3.102 adjustable thermostat mechanical thermostat in which the temperature set-point can be adjusted by the user to anywhere between minimum and maximum values 3.103 fixed setting thermostat mechanical thermostat that has a preset fixed operating temperature which cannot be adjusted by the user 3.104 snap-acting thermostat mechanical thermostat with only two positions for the flow rate, i.e. ‘full on-off’, ‘full on-reduced rate’ or ‘reduced rate-off’ 3.105 modulating thermostat mechanical thermostat which controls the flow rate in accordance with a predetermined and continuous function of the temperature of the temperature sensor SIST EN 257:2010
Classes of control functions EN 13611:2007, 4.3 is not applicable. 5 Units of measurement and test conditions Shall be according to EN 13611:2007, Clause 5. 6 Construction requirements 6.1 General Shall be according to EN 13611:2007, 6.1. 6.2 Mechanical parts of the control 6.2.1 Appearance Shall be according to EN 13611:2007, 6.2.1. 6.2.2 Holes Shall be according to EN 13611:2007, 6.2.2. 6.2.3 Breather holes Shall be according to EN 13611:2007, 6.2.3. SIST EN 257:2010
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