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BS EN 257:2022

BS EN 257:2022

$189.07

Mechanical thermostats for gas-burning appliances

Published By Publication Date Number of Pages
BSI 2022 46
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Classification
4.1 Classes of control
4.2 Groups of control
4.3 Classes of control functions
12 4.4 Types of DC supplied controls
5 Test conditions and uncertainty of measurements
6 Design and construction
6.1 General
6.2 Mechanical parts of the control
6.2.1 Appearance
6.2.2 Holes
6.2.3 Breather holes
6.2.4 Screwed fastenings
6.2.5 Jointing
6.2.6 Moving parts
6.2.7 Sealing caps
6.2.8 Dismantling and reassembly
6.2.9 Auxiliary canals and orifices
6.2.10 Presetting device
13 6.3 Materials
6.4 Gas connections
6.5 Electrical parts of the control
6.6 Protection against internal faults for the purpose of functional safety
6.101 Flow characteristics
6.102 Temperature adjustment
6.102.1 Range adjustment
6.102.2 Set-point adjustment
6.102.3 Fixed setting thermostat
14 7 Performance
7.1 General
7.1.101 Sequence of testing
15 7.2 Leak-tightness
7.2.1 Requirements
7.2.2 Tests
7.2.2.1 General
7.2.2.2 External leak-tightness
7.2.2.3 Internal leak-tightness
7.3 Torsion and bending
7.4 Rated flow rate
7.4.1 Requirement
16 7.4.2 Test
7.4.3 Conversion of air flow rate
7.5 Durability
7.6 Performance tests for electronic controls
7.7 Long-term performance for electronic controls
7.8 Data exchange
7.101 Calibration temperature set-point
7.101.1 Requirement
7.101.2 Test
7.102 Backlash
7.102.1 Requirement
7.102.2 Test
17 7.103 Opening of a snap-acting thermostat with a closed position
7.103.1 Requirement
7.103.2 Test
7.104 Opening pressure and closing pressure for thermostats with a closed position
7.104.1 Requirement
7.104.2 Test
7.105 Operating characteristic of the thermostat
7.105.1 Requirement
18 7.105.2 Test
21 7.106 Ambient temperature range of the body
7.106.1 Requirement
7.106.2 Test
7.107 Effect of storage and transport temperatures
7.107.1 Requirement
22 7.107.2 Test
7.108 Thermal overload of the temperature sensor
7.108.1 Requirement
7.108.2 Test
7.109 Operating torque of the thermostat set-point adjuster
7.109.1 Requirement
7.109.2 Test
7.110 Endurance
7.110.1 Requirement
23 7.110.2 Tests
7.110.2.1 Mechanical cycling test
7.110.2.2 Thermal cycling test
24 8 Electrical requirements
9 Electromagnetic compatibility (EMC)
10 Marking, instructions
10.1 Marking
10.2 Instructions
25 10.3 Warning notice
26 Annex A (informative)Abbreviations and Symbols
27 Annex B (informative)Leak-tightness tests for gas controls – volumetric method
28 Annex C (informative)Leak-tightness tests for gas controls – pressure loss method
29 Annex D (normative)Conversion of pressure loss into leakage rate
30 Annex E (normative)Electrical/electronic component fault modes
31 Annex F (normative)Additional requirements for safety accessories and pressure accessories as defined in EU Directive 2014/68/EU
32 Annex G (normative)Materials for pressurized parts
33 Annex H (normative)Additional materials for pressurized parts
34 Annex I (normative)Requirements for controls used in DC supplied burners and appliances burning gaseous or liquid fuels
35 Annex J (normative)Method for the determination of the Safety Integrity Level (SIL)
36 Annex K (normative)Method for the determination of a Performance Level (PL)
37 Annex L (informative)Relationship between Safety Integrity Level (SIL) and Performance Level (PL)
38 Annex M (normative)Reset functions
39 Annex N (informative)Guidance document on Environmental Aspects
40 Annex O (normative)Seals of elastomers, cork and synthetic fibre mixtures
41 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Regulation (EU) 2016/426 aimed to be covered

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BS EN 257:2022
$189.07