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Norm
ÖNORM EN 257
Issue date: 2023 05 15
Mechanical thermostats for gas-burning appliances
This document specifies the safety, design, construction, and performance requirements and testing for mechanical thermostats intended for use with gas appliances and sim...
Withdrawn: 2024 08 01
§ Legal References
Publisher:
Austrian Standards International
Format:
Digital | 44 Pages
Language:
English
Currently valid:
Optionally co-design standards:
ICS
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.
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).
ÖNORM M 7421-2
1980 09 01
Combinations of controls for gas appliances; temperature regulators and temperature limiters in comb...
Norm