prEN 257 rev

Safety and control devices for burners and appliances burning gaseous fuels - Mechanical thermostats for gas-burning appliances for inlet pressures up to and including 50 kPa

Scope

EN 13611:202x, Clause 1 applies with the following modification and addition:
Modification:
The 1st paragraph of EN 13611:202x, 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 13611:202x, Clause 1 is removed.

Related legislation

Legislation related to this standard