EN 257:2022
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Mechanical thermostats for gas-burning appliances
10-31-2025
10-12-2022
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.
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