IEC TS 63542:2024

IEC TS 63542 ®
Edition 1.0 2024-08
TECHNICAL
SPECIFICATION
Refrigerant detection systems for flammable refrigerants

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IEC TS 63542 ®
Edition 1.0 2024-08
TECHNICAL
SPECIFICATION
Refrigerant detection systems for flammable refrigerants

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.120  ISBN 978-2-8322-9545-8

– 2 – IEC TS 63542:2024 © IEC 2024
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirement . 7
5 Test gases and default test conditions . 8
6 Response time of the refrigerant detection system . 9
7 Refrigerant detection system calibration and short-term stability . 10
8 Selectivity test and poisoning test . 10
9 Refrigerant poisoning and oil spray test . 11
9.1 General . 11
9.2 Test set-up . 12
9.3 Test procedure . 14
9.4 Check of alarm set point and response time . 14
10 Long term stability . 15
11 Humidity test . 15
12 Temperature test . 15
13 Vibration requirements . 16
14 Ignition test . 17
15 Refrigerant detection system self-test routine . 17
16 Serviceability . 17
17 Refrigerant sensor identification . 17
Bibliography . 18

Figure 1 – Example of test chamber design . 13

Table 1 – Relationship among alarm set point, tolerance and test gas (informative) . 9
Table 2 – Gas and vapour concentrations . 11
Table 3 – Example of the test chamber design . 14

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
REFRIGERANT DETECTION SYSTEMS
FOR FLAMMABLE REFRIGERANTS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
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IEC TS 63542 has been prepared by subcommittee 61D: Appliances for air-conditioning for
household and similar purposes, of IEC technical committee 61: Safety of household and similar
electrical appliances. It is a Technical Specification.
This first edition is based on Annex LL of IEC 60335-2-40:2022:
– Clause 4 – based on Clause LL.1, but without the 1st paragraph. An additional last
paragraph has been added to link to relevant application standards;
– Clause 5 – based on Clause LL.2. An introductory sentence has been added to link to test
conditions in the relevant application standard;
– Clause 6 – based on Clause LL.3;
– Clause 7 – based on Clause LL.4;
– Clause 8 – based on Clause LL.5;
– Clause 9 – based on Clause LL.6;

– 4 – IEC TS 63542:2024 © IEC 2024
– Clause 10 – based on Clause LL.7;
– Clause 11 – based on Clause LL.8;
– Clause 12 – based on Clause LL.9;
– Clause 13 – based on Clause LL.10;
– Clause 14 – based on Clause LL.11;
– Clause 15 – based on Clause LL.12;
– Clause 16 – based on Clause LL.13;
– Clause 17 – based on Clause LL.14.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
61D/531/DTS 61D/534/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
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NOTE The following print types are used:
• requirements: in roman type;
• test specifications: in italic type;
• notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and
associated noun are also in bold.
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• reconfirmed,
• withdrawn, or
• revised.
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INTRODUCTION
It has been assumed in the drafting of this document that the execution of its provisions is
entrusted to appropriately qualified and experienced persons.
A refrigerant detection systems that complies with the text of this document will not necessarily
be considered to comply with the safety principles of the document if, when examined and
tested, it is found to have other features that impair the level of safety covered by these
requirements.
A refrigerant detection systems employing materials or having forms of construction differing
from those detailed in the requirements of this document may be examined and tested according
to the intent of the requirements and, if found to be substantially equivalent, may be considered
to comply with this document.
– 6 – IEC TS 63542:2024 © IEC 2024
REFRIGERANT DETECTION SYSTEMS
FOR FLAMMABLE REFRIGERANTS
1 Scope
This document applies to refrigerant detection systems for use in appliances complying with
a relevant standard of the IEC 60335 series using flammable refrigerants.
Relevant standards of the IEC 60335-series include:
– IEC 60335-2-40, Household and similar electrical appliances – Safety – Part 2-40: Particular
requirements for electrical heat pumps, air-conditioners and dehumidifiers
– IEC 60335-2-89, Household and similar electrical appliances – Safety – Part 2-89: Particular
requirements for commercial refrigerating appliances and ice-makers with an incorporated
or remote refrigerant unit or
...