SIST EN 14597:2012
(Main)Temperature control devices and temperature limiters for heat generating systems
Temperature control devices and temperature limiters for heat generating systems
This European Standard applies to electrical or non-electrical temperature control devices which are used to control temperatures within heat generating systems by controlling the supply of energy; it also applies to limiting devices which ensure that the temperature in heat generating systems will not exceed a predefined limit. This European Standard specifies operating values, operating times, and operational sequences associated with the safety of the heat generating system. This European Standard also applies to controls using NTCs or PTCs thermistors, additional requirements for which are contained in Annex J of IEC 60730-2-9. This European Standard applies to controls with a rated voltage not exceeding 690 V and with a rated current not exceeding 63 A. This European Standard also applies to manual controls if, electrically and/or mechanically, they form an integral part of automatic controls.
Temperaturregeleinrichtungen und Temperaturbegrenzer für wärmeerzeugende Anlagen
1.1 Diese Europäische Norm gilt für elektrische oder nichtelektrische Temperatur¬regeleinrichtungen, die zur Regelung der Temperatur in wärmeerzeugenden Anlagen durch Regelung der Energiezufuhr verwendet werden, sowie für Begrenzungseinrichtungen, die sicherstellen, dass die Tempera¬tur in den wärme-erzeugenden Anlagen einen zuvor festgelegten Wert nicht überschreitet.
Diese Europäische Norm legt Betriebswerte, Betriebsdauer und Betriebsabläufe fest, die von der Sicherheit der wärmeerzeugenden Anlage vorgegeben werden.
Diese Europäische Norm gilt auch für Regel und Steuergeräte, in denen NTC oder PTC Thermistoren verwendet werden, für die zusätzliche Anforderungen in Anhang J von IEC 60730 2 9 enthalten sind.
Diese Europäische Norm gilt für Regel und Steuergeräte mit einer Bemessungsspannung bis zu 690 V und einem Bemessungsstrom bis zu 63 A.
Diese Europäische Norm gilt auch für manuell betätigte Regel und Steuergeräte, falls diese elektrisch und/oder mecha¬nisch einen integralen Bestandteil von automatischen Regel und Steuergeräten darstellen.
ANMERKUNG Anforderungen an manuell betätigte Schalter, die nicht zu einem automatischen Regel und Steuergerät gehören, sind in EN 61058 1 enthalten.
Diese Norm gilt nicht für Raumtemperaturregler.
1.2 In dieser Europäischen Norm wird der Ansprechwert einer automatischen Wirkungsweise des RS nicht berücksichtigt, wenn ein derartiger Ansprechwert von der Art des Anbringens des RS in der wärmeer-zeugenden Anlage oder dem Betriebsmittel abhängt; in diesem Fall sollte das RS zusammen mit dem Wärmeerzeuger geprüft werden. Ist ein Ansprechwert von besonderer Bedeutung für den Schutz des Benutzers oder der Umgebung, gilt der in der entsprechenden Haushaltgerätenorm definierte oder der vom Hersteller bestimmte Wert.
1.3 Diese Europäische Norm gilt auch für RS, die elektronische Einrichtungen enthalten und für die die Anforderungen in Anhang DX enthalten sind.
Dispositifs de régulation et de limitation de température pour les systèmes générateurs de chaleur
1.1 La présente Norme européenne s’applique aux dispositifs de régulation de la température d’appareils électriques ou non électriques, utilisés pour contrôler la température dans des systèmes générateurs de chaleur en agissant sur l’alimentation en énergie. Elle s’applique également aux limiteurs qui permettent de maintenir la température dans les systèmes générateurs de chaleur à une valeur ne dépassant pas une limite prédéfinie.
La présente Norme européenne spécifie des valeurs de réglage, des durées de fonctionnement et des séquences de fonctionnement associées à la sécurité du système générateur de chaleur.
La présente Norme européenne s’applique également aux dispositifs de commande utilisant des thermistances à coefficient de température négatif (CTN) ou à coefficient de température positif (CTP), pour lesquelles des exigences supplémentaires sont mentionnées en Annexe J de la CEI 60730-2-9.
La présente Norme européenne s’applique également aux dispositifs de commande dont la tension nominale ne dépasse pas 690 V et dont le courant nominal ne dépasse pas 63 A.
La présente Norme européenne s’applique également aux dispositifs de commande manuelle dans la mesure où ils font partie intégrante, électriquement et/ou mécaniquement, des dispositifs de commande automatique.
NOTE Les exigences relatives aux interrupteurs à commande manuelle ne faisant pas partie d’un dispositif de commande automatique sont mentionnées dans l’EN 61058-1.
La présente Norme européenne ne s’applique pas aux thermostats d’ambiance.
1.2 La présente Norme européenne ne prend pas en considération la valeur de réponse d’une action automatique du dispositif de commande lorsqu’elle est influencée par la méthode de montage du dispositif de commande dans le système ou l’équipement générateur de chaleur, auquel cas il convient de soumettre à l’essai le dispositif de commande avec le générateur de chaleur.
Naprave za regulacijo in omejevanje temperature za sisteme generiranja toplote
Ta evropski standard se uporablja za naprave za električno ali neelektrično regulacijo temperature, ki se uporabljajo za regulacijo temperature v sistemih generiranja toplote in se z njimi regulira dovajanje energije; uporablja se tudi za naprave za omejevanje, ki zagotavljajo, da temperatura v ogrevalnih sistemih ne preseže predhodno določene omejitve. Ta evropski standard določa delovne vrednosti, čas delovanja in operativna zaporedja, povezana z varnostjo sistema generiranja toplote. Ta evropski standard se uporablja tudi za naprave za regulacijo, ki uporabljajo termistorje NTC ali PTC, za katere so dodatne zahteve opredeljene v Prilogi J k standardu IEC 60730-2-9. Ta evropski standard se uporablja za naprave za regulacijo, katerih nazivna napetost ne presega 690 V, nazivni tok pa ne 63 A. Ta evropski standard se uporablja tudi za ročne naprave za regulacijo, če so v električnem in/ali mehanskem smislu sestavni del samodejnih naprav za regulacijo.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Naprave za regulacijo in omejevanje temperature za sisteme generiranja toploteTemperaturregeleinrichtungen und Temperaturbegrenzer für wärmeerzeugende AnlagenDispositifs de régulation et de limitation de température pour les systèmes générateurs de chaleurTemperature control devices and temperature limiters for heat generating systems97.120Avtomatske krmilne naprave za domAutomatic controls for household use91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 14597:2012SIST EN 14597:2012en,fr,de01-november-2012SIST EN 14597:2012SLOVENSKI
STANDARDSIST EN 14597:20061DGRPHãþD
SIST EN 14597:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14597
June 2012 ICS 17.200.20; 97.120 Supersedes EN 14597:2005English Version
Temperature control devices and temperature limiters for heat generating systems
Dispositifs de régulation et de limitation de température pour les systèmes générateurs de chaleur
Temperaturregeleinrichtungen und Temperaturbegrenzer für wärmeerzeugende Anlagen This European Standard was approved by CEN on 10 May 2012.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14597:2012: ESIST EN 14597:2012
EN 14597:2012 (E) 2 Contents Page Foreword .4Introduction .51 Scope .82 Normative references .83 Terms and definitions .94 General requirements and general notes on tests . 125 Rating . 126 Classification . 127 Information . 138 Protection against electric shock . 139 Provision for protective earthing . 1310 Terminals and terminations . 1311 Constructional requirements . 1312 Moisture and dust resistance . 1513 Electric strength and insulation resistance . 1514 Heating . 1515 Manufacturing deviation and drift . 1616 Environmental stress resulting from transport and storage . 1717 Endurance . 1718 Mechanical strength . 1719 Threaded parts and connections . 1720 Creepage distances, clearances and distances through insulation . 1721 Resistance to heat, fire, and tracking . 1722 Resistance to corrosion . 1723 Electromagnetic Compatibility (EMC) requirements — Emission . 1724 Components . 1825 Normal operation . 1826 Electromagnetic compatibility (EMC) requirements — Immunity . 1827 Abnormal operation . 1828 Guidance on the use of electronic disconnection . 18Annex AX (normative)
Actions required . 21Annex BX (normative)
Information . 24Annex CX (normative)
Maximum permissible time factor values . 32Annex DX (normative)
Actuator devices with safety functions in heat generating systems . 33DX.11 Construction additions: . 33SIST EN 14597:2012
EN 14597:2012 (E) 3 DX.14 Heating. 34DX.17 Endurance Addition to 17.1: . 34Annex EX (informative)
Characteristics of typical temperature sensors and their fault modes . 35Bibliography . 36 Tables Table 1 — List of standards (non-exhaustive) for equipment using temperature control devices within the scope of this document . 6Table 14.201 — Test parameters for temperature sensing controls used in specific applications . 16Table AX.1a — Actions required for operating and protective controls for HGS according to their device codes . 21Table AX.1b — Actions required for actuators for HGS according to their device code . 23Table BX.1 — Information according to temperature sensing controls for HGS . 24Table CX.1 — Maximum permissible time factor values according to the application . 32Table EX.1 — Characteristics of typical temperature sensors . 35 SIST EN 14597:2012
EN 14597:2012 (E) 4 Foreword This document (EN 14597:2012) has been prepared by Technical Committee CEN/TC 247 “Building Automation, Controls and Building Management”, the secretariat of which is held by SNV. 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 December 2012, and conflicting national standards shall be withdrawn at the latest by December 2012. 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 EN 14597:2005. Compared to the previous edition, the following significant technical changes have been incorporated in this European Standard: a) In Clause 3, the classification of the controls to protective control or operating control was adjusted. If the letter “S” is used in the abbreviation, the word safety will also be used in the associated definition. Contractions between the definitions in Clause 3 and further requirements in the standard, especially in Table AX of the standard were removed; b) In Clause 11, the action 2V was adapted to the requirements of the standard content; c) In Annex H, the fault modes were adjusted to the existing approaches, a new Annex EX (informative) for characteristics of typical temperature sensors and their fault modes; d) Annex J applies to thermistors;
e) Expansion of footnote 205 for requirement 27; also the new footnote 208 for the requirement 27 in Table BX.1. The test specification in requirement 27 was clarified. According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
SIST EN 14597:2012
EN 14597:2012 (E) 5 Introduction This European Standard specifies the functional requirements and tests for control devices which result from their application in thermal installations. These include, for example, time response and safety aspects of those devices which enable the safe operation of the installation. A distinction is made between special requirements for the different operating media: air, water, oil and flue gas. This European Standard includes purely mechanical constructions, electrical and electronic constructions, and constructions using software. There exist "standard applications" for which in the past "typical" devices or combinations thereof have been used. Some of these devices may also be of purely mechanical construction. Such "standard devices” are described in this document and identified by letter codes. Their properties and functions are described in definitions using the language and definitions of the EN 60730 series, so to make sure that existing devices (using the same letter codes) are not incompatible when tested using this document. The devices described in this European Standard contain sensors, control units and positioning outputs and, if needed, actuator devices. The requirements for mechanical safety, electrical safety and EMC are covered by the standards of the EN 60730 series under the LVD and EMC Directives. To make sure that when translating this document into other languages, no unintended meaning is attached to certain words or that words are used as in former practices, the different devices are identified and defined by device codes consisting of up to four letters. It is strongly recommended that no other meaning than that given by the definitions of this document and of the EN 60730 series is attached to the letter codes. This European Standard has been created for temperature sensing controls for use in heat generating systems. It might still be useful however to quote it for other applications, either wholly or in part. Remarks to product committees specifying devices within the scope of this European Standard to ensure safety of the controlled applications within the scope of their standards: The attention of product committees specifying devices from this European Standard to cover technical risks of the operation of applications within the scope of their standards is drawn to the following fact. Merely specifying a general type of device (e. g. thermal cut out) according to this document for a specific application does not generally ensure the safety of the controlled application and may indeed be a recipe for disaster. The use of a control itself does not provide safety. Rather, safety is only provided if the control is suitable to be used with that application. It is necessary to assess the risk situation of the controlled application by accepted engineering procedures (risk and/or fault analysis, FMEA, or other). It is also necessary to select from the devices with different device codes given in this document the device(s) that adequately limit the risk to acceptable levels by controlling or preventing possible failures and errors from occurring during operation of the application. In order to limit risk in the controlled applications, controls as specified in Annex AX of this document need to be used. For control purposes operating controls, and for risk limiting protective controls need to be used. If a protective control also provides operating control functions, any failure of the operating function or part of the control should not prevent the protective operation of the control. This European Standard covers safety related aspects pertaining to the operation and inherent safety of operating and protective controls for heat generating systems. SIST EN 14597:2012
EN 14597:2012 (E) 6 This European Standard does not limit construction to single function devices: multifunctional devices which could be classified for different functions are allowed within specified conditions. In this way, the use of devices using electronics or software is possible. In this European Standard, the term "heat generating system" can also mean "heat exchanger". In this European Standard, the term "heat generating system" comprises all equipment incorporated in such a system, for which other standards will normally apply as well. Examples are given below in Table 1. Table 1 — List of standards (non-exhaustive) for equipment using temperature control devices within the scope of this document Standard number Title (short version) CEN/TC Remarks EN 26 Gas-fired instantaneous water heaters for sanitary uses production, fitted with atmospheric burners TC 48 Domestic gas fired water heaters EN 89 Gas-fired storage water heaters for the production of domestic hot water TC 48 EN 30 Domestic cooking appliances burning gas TC 49 Gas cooking appliances EN 303-1 Heating boilers — Part 1: Heating boilers with forced draught burners — Terminology, general requirements, testing and marking TC 57 Heating boilers EN 613 Independent gas-fired convection heaters TC 62 Independent gas-fired space heaters EN 1266 Independent gas-fired convection heaters incorporating a fan to assist transportation of combustion air and/or flue gases TC 62 EN 203 Gas heated catering equipment TC 106 Large kitchen appliances using gaseous fuels EN 297 Gas-fired central heating boilers TC 109 Central heating boilers using gaseous fuels EN 483
EN 656
EN 303-3 Heating boilers — Part 3: Gas-fired central heating boilers — Assembly comprising a boiler body and a forced draught burner TC 109 EN 625 Gas-fired central heating boilers — Specific requirements for the domestic hot water operation of combination boilers of nominal heat input not exceeding 70 kW TC 109 EN 677 Gas-fired central heating boilers — Specific requirements for condensing boilers with a nominal heat input not exceeding 70 kW TC 109 EN 676 Automatic forced draught burners for gaseous fuels TC 131 Gas burners using fans SIST EN 14597:2012
EN 14597:2012 (E) 7 Table 1 (continued) Standard number Title (short version) CEN/TC RemarksEN 525 Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW TC 180 Gas-fired air heaters EN 621 Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products
EN 1020 Non-domestic forced convection gas-fired air heaters for space heating not exceeding a net heat input of 300 kW incorporating a fan to assist transportation of combustion air or combustion products
EN 778 Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products TC 180 EN 1319 Domestic gas-fired forced convection air heaters for space heating, with fan-assisted burners not exceeding a net heat input of 70 kW
EN 1196 Domestic and non-domestic gas-fired air heaters — Supplementary requirements for condensing air heaters TC 180 EN 12669 Direct gas-fired hot air blowers for use in greenhouses and supplementary non-domestic space heating TC 180
EN 12828 Heating systems in buildings — Design for water-based heating systems TC 228
EN 416-1 Single burner gas-fired overhead radiant tube heaters for non-domestic use — Part 1: Safety TC 180 Non-domestic gas-fired overhead radiant heaters EN 416-2 Single burner gas-fired overhead radiant tube heaters for non-domestic use — Part 2: Rational use of energy
EN 419-1 Non-domestic gas-fired overhead luminous radiant heaters — Part 1: Safety
EN 419-2 Single burner gas-fired overhead radiant tube heaters for non-domestic use — Part 2: Rational use of energy
EN 12952-8 Water-tube boilers and auxiliary installations — Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler TC 269 Shell and water-tube boilers EN 12953-7 Shell boilers — Part 7: Requirements for firing systems for liquid and gaseous fuels for the boilers TC 269 SIST EN 14597:2012
EN 14597:2012 (E) 8 When referring to this European Standard, product committees should require in their product standards particular values as necessary for requirements according to Annex BX. If this European Standard is used for controls other than for heat generating systems and it is considered necessary to add or modify requirements, care needs to be taken to follow the principles of risk management contained in the EN 60730 series in order to maintain the overall integrity of the requirements of that series of standards. This European Standard refers to EN
60730-2-9 and modifies and replaces requirements of that standard as appropriate for the purpose of this document. If not stated otherwise, all references refer to Clauses of EN 60730-2-9, which is applied in combination with EN 60730-1. Actuator devices are covered by EN 60730-2-14, if applicable. NOTE Additional requirements or tests are numbered, starting with a number higher than X.200 and X being the particular Clause number. This is done in order to distinguish additional requirements from the requirements and tests of EN 60730-1 and the corresponding Parts 2, where numbering starts above X.100. All other Clause numbers refer to Clauses of EN 60730-2-9 and EN 60730-1. 1 Scope 1.1 This European Standard applies to electrical or non-electrical temperature control devices which are used to control temperatures within heat generating systems by controlling the supply of energy. It also applies to limiting devices which ensure that the temperature in heat generating systems will not exceed a predefined limit. This European Standard specifies operating values, operating times, and operational sequences associated with the safety of the heat generating system. This European Standard also applies to controls using NTCs or PTCs thermistors, additional requirements for which are contained in Annex J of EN 60730-2-9:2010. This European Standard applies to controls with a rated voltage not exceeding 690 V and with a rated current not exceeding 63 A. This European Standard also applies to manual controls if, electrically and/or mechanically, they form an integral part of automatic controls. NOTE Requirements for manually operated switches not forming part of an automatic control are contained in EN 61058-1. This European Standard does not apply to room thermostats. 1.2 This European Standard does not take into account the response value of an automatic action of the control, if such a response value is dependent upon the method of mounting the control in the heat generating system or equipment, in which case the control should be tested together with the heat generator. Where a response value is of significance for the protection of the user or surroundings, the value defined in the appropriate household equipment standard or as determined by the manufacturer applies. 1.3 This European Standard applies also to controls incorporating electronic devices, requirements for which are contained in Annex DX. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. SIST EN 14597:2012
EN 14597:2012 (E) 9 EN 60730-1:2011, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:2010, modified) EN 60730-2-8:2002+A1:2003, Automatic electrical controls for household and similar use — Part 2-8: Particular requirements for electrically operated water valves, including mechanical requirements (IEC 60730-2-8:2000+A1:2002, modified) EN 60730-2-9:2010, Automatic electrical controls for household and similar use — Part 2-9: Particular requirements for temperature sensing controls (IEC 60730-2-9:2008, modified) EN 60730-2-14:1997+A1:2001+A11:2005+A2:2008, Automatic electrical controls for household and similar use — Part 2-14: Particular requirements for electric actuators (IEC 60730-2-14:1995, modified +A1:2001+A2:2007, modified) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 60730-2-9:2010, Clause 2 and the following apply. 3.201 operating differential difference between the upper and lower values of the operating value; for control devices types TB, STB, and ASTB, the difference between the fixed limit value and the temperature at the sensing element at which a manual reset is possible Note 1 to entry: The definition according to EN 60730-1:2011, has been modified. 3.202 temperature sensing control type TR thermostat or modulating thermostat used in heat generating systems for controlling the temperature of liquid or/and gaseous media, which has provisions for setting by the user and which, if equipped with an electrical output, provides at least type 1B action Note 1 to entry: See 2.2.4 and 2.2.6 of EN 60730-1:2011 and see 2.2.105 of EN 60730-2-9:2010. Note 2 to entry: Elsewhere in this document, this device is designated by the device code TR. 3.203 temperature sensing control type FR combustion control used in heat generating systems, which is a TR influencing the supply of combustion air for solid fuels as a function of the temperature of the controlled medium Note 1 to entry: Usually these devices are mechanical. If they are electrical, they will be TRs with an additional actuator. See EN 60730-2-14 for control of the air flow. Note 2 to entry: Elsewhere in this document, this device is designated by the device code FR. 3.204 temperature sensing control type TW temperature operating control for heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which, if electrical, provides type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool Note 1 to entry: TW is a monitoring control as a class A control function according to EN 60730-1:2011. Note 2 to entry: Elsewhere in this document, this device is designated by the device code TW. SIST EN 14597:2012
EN 14597:2012 (E) 10 3.205 temperature sensing control type STW safety thermal cut out; protective control for heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which provides type 2P and type 2K actions, and, if electrical, type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool Note 1 to entry: Type 2K action will be considered to be provided if type 2N action is provided. Note 2 to entry: This device is typically required to prevent overheating in heat generating systems under abnormal operation conditions (see EN 483 and EN 1020). Note 3 to entry: See also EN 60730-1:2011. Note 4 to entry: Elsewhere in this document, this device is designated by the device code STW. 3.206 temperature sensing control type ATW safety thermal cut out; protective control for limiting the flue gas temperature in heat generating systems where, upon response, automatic reset takes place after the temperature at the sensing element has dropped/risen below/above the adjusted limit value by the amount of the operating differential, and which provides type 2P and type 2K actions, and, if electrical, type 2B action, and whose settings are unchangeably fixed or can be fixed with a tool or a special tool Note 1 to entry: The concept of "extended safety", which is the action of a temperature limiting device to cut out or limit the temperature of the controlled application, should a fault internal to the control occur, has been worked into 2.205 and other definitions. For the same purpose, Notes 8 and 9 have been added to Table AX.1 which contains the requirements for software class and fault analysis of controls using electronic devices. Note 2 to entry: Elsewhere in this document, this device is designated by the device code ATW. 3.207 temperature sensing control type Th STW used as a thermal bypass protection for solid fuel heat generating systems and which senses the heated media temperature and operates to cause energy to be carried off by opening a regulating unit, e. g. a valve; the settings of this control are unchangeably fixed Note 1 to entry: Usually this is a mechanical device. This function could also be provided by an STW controlling a valve. Note 2 to entry: Elsewhere in this document, this device is designated by the device code Th. 3.208 temperature sensing control type ASW flue gas flow control (protective) for heat generating systems which senses wrong direction of the flue gas flow by monitoring the flue gas temperature and causes the fuel flow to be cut off
Note 1 to entry: The control provides either an automatic reset after a minimum time delay of 10 min or type 2H and type 2V actions. Note 2 to entry: The flue gas flow control is used for monitoring the flue gas passages of gas-fired equipment with natural draught burners. Note 3 to entry: Elsewhere in this document, this device is designated by the device code ASW. SIST EN 14597:2012
EN 14597:2012 (E) 11 3.209 temperature sensing control type TB temperature limiter (protective control) for heat generating systems which can only be reset manually or with a tool and which provides at least the following actions: type 2B, type 2V and optionally type 2F, the settings of which are unchangeably fixed or can be fixed with a tool or a special tool Note 1 to entry: Elsewhere in this document, this device is designated by the device code TB. 3.210 temperature sensing control type STB safety temperature limiter (thermal cut out, protective control) for heat generating systems which can only be reset manually or by a tool and which provides at least the following actions: type 2B, type 2K, type 2P and type 2V and optionally any of the following actions: type 2F and type 2N; the settings of this control are unchangeably fixed or can be fixed with a tool or a special tool Note 1 to entry: Type 2K action will be considered to be provided if type 2N action is provided. Note 2 to entry: Elsewhere
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