1 Scope
EN 13611:2019, Clause 1 applies with the following modification and addition:
Modification:
The 1 st 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 4 th paragraph of EN 13611:2019, Clause 1 is removed.
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