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BS EN 257:2022 – TC

BS EN 257:2022 – TC

$226.20

Tracked Changes. Mechanical thermostats for gas-burning appliances

Published By Publication Date Number of Pages
BSI 2022 106
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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
62 undefined
69 1 Scope
2 Normative references
3 Terms and definitions
71 4 Classification
4.1 Classes of control
4.2 Groups of control
4.3 Classes of control functions
72 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
73 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
74 7 Performance
7.1 General
7.1.101 Sequence of testing
75 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
76 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
77 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
78 7.105.2 Test
81 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
82 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
83 7.110.2 Tests
7.110.2.1 Mechanical cycling test
7.110.2.2 Thermal cycling test
84 8 Electrical requirements
9 Electromagnetic compatibility (EMC)
10 Marking, instructions
10.1 Marking
10.2 Instructions
85 10.3 Warning notice
86 Annex A (informative)Abbreviations and Symbols
87 Annex B (informative)Leak-tightness tests for gas controls – volumetric method
88 Annex C (informative)Leak-tightness tests for gas controls – pressure loss method
89 Annex D (normative)Conversion of pressure loss into leakage rate
90 Annex E (normative)Electrical/electronic component fault modes
91 Annex F (normative)Additional requirements for safety accessories and pressure accessories as defined in EU Directive 2014/68/EU
92 Annex G (normative)Materials for pressurized parts
93 Annex H (normative)Additional materials for pressurized parts
94 Annex I (normative)Requirements for controls used in DC supplied burners and appliances burning gaseous or liquid fuels
95 Annex J (normative)Method for the determination of the Safety Integrity Level (SIL)
96 Annex K (normative)Method for the determination of a Performance Level (PL)
97 Annex L (informative)Relationship between Safety Integrity Level (SIL) and Performance Level (PL)
98 Annex M (normative)Reset functions
99 Annex N (informative)Guidance document on Environmental Aspects
100 Annex O (normative)Seals of elastomers, cork and synthetic fibre mixtures
101 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 - TC
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