IEC 60335-2-40:2024/AMD1:2026

IEC 60335-2-40 ®
Edition 8.0 2026-08
INTERNATIONAL
STANDARD
AMENDMENT 1
Household and similar electrical appliances - Safety -
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
ICS 23.120  ISBN 978-2-8327-1439-3

IEC 60335-2-40:2024-12/AMD1:2026-08(en)

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Household and similar electrical appliances - Safety -
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers

AMENDMENT 1
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
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 60335-2-40:2024 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.
The text of this Amendment is based on the following documents:
Draft Report on voting
61D/568/FDIS 61D/572/RVD
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 Amendment 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
described in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 60335 series, under the general title: Household and similar electrical
appliances - Safety, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
___________
1 Scope
Replace the existing fifth paragraph with the following:
This standard does not take into account refrigerants other than safety group A1, A2L, A2 and
A3 as defined by ISO 817. For refrigerant blends, the classification based on WCF is used.
Flammable refrigerants are limited to those of a molar mass of more than or equal to
42 kg/kmol as specified in ISO 817. For refrigerant blends, the molar mass shall be based on
WCF (worst case formulation).
NOTE 103 The tables with ISO 817 refrigerant data are provided at https://standards.iso.org/iso/817/ma/en/.
Renumber the existing NOTE 103 and NOTE 104 as NOTE 104 and NOTE 105.
2 Normative references
Replace, in reference IEC 60335-2-34, publication date "2021" with "2024".
Add the publication date "2025" to ISO 14903.
Delete ISO 1302 from the list.
Add the following new documents to the list:
ISO 4126-1, Safety devices for protection against excessive pressure - Part 1: Safety valves
ISO 4126-2, Safety devices for protection against excessive pressure - Part 2: Bursting disc
safety devices
ISO 13971, Refrigeration systems and heat pumps - Flexible pipe elements, vibration isolators,
expansion joints and non-metallic tubes - Requirements and classification
ISO 24664, Refrigerating systems and heat pumps - Pressure relief devices and their associated
piping - Methods for calculation
3 Terms and definitions
3.117
appliances accessible to the general public
Replace the existing definition with the following definition and Note to entry:
appliances that are installed in an area open to the public and not in a location with restricted
access, or appliances intended for household use and not installed in a location with restricted
access
Note 1 to entry: Examples of restricted access are machine rooms, rooftop and the like, or parts of appliances
installed at a level above 2,5 m.
3.118
appliances not accessible to the general public
Replace the existing definition with the following:
appliances which are not appliances accessible to the general public
3.120
flammable refrigerant
Replace the existing definition with the following definition and Note to entry:
refrigerant with a flammability classification of Class 2L, Class 2 or Class 3 in accordance with
ISO 817
Note 1 to entry: For blends, the classification based on worst case formulation (WCF) according to ISO 817 is used.
3.138
refrigerant detection system
Replace the existing definition and Note to entry with the following:
sensing system with one or more refrigerant sensors with electronic circuit that determines
if an output signal is required based on a comparison of a sensed refrigerant gas concentration
to a pre-set concentration of refrigerant
Note 1 to entry: The following components are part of a refrigerant detection system:
– refrigerant sensor.
– circuits that perform self-test routines of the refrigerant detection system and provide an error signal,
– circuits that provide an output signal based on pre-set concentration of refrigerant detected by the refrigerant
sensor,
– interconnected circuits and electronic circuits between the refrigerant sensor and circuit sending the output
signal.
3.141
A2L refrigerant
Add the following new Note to entry:
Note 1 to entry: For blends, the classification based on worst case formulation (WCF) according to ISO 817 is used.
3.142
lower flammability limit
Replace the existing Note to entry with the following:
Note 1 to entry: Data is listed in ISO 817.
3.161
potential leak point
Add, in the existing definition, the following text after "similar stresses":
or air/refrigerant separator or pressure relief valve for compliance with Clause GG.6 placed in
the secondary circuit
Add, after 3.166, the following new terms and definitions and bold face them throughout the
document:
3.167
intermediate chamber
space between the refrigerant channel and secondary fluid channel in a double wall heat
exchanger
3.168
refrigerant pressure relief device
refrigerant pressure relief valve or bursting disc to relieve excessive pressure automatically
3.169
refrigerant pressure relief valve
pressure actuated valve held shut by a spring or other means and designed to automatically
relieve excessive pressure in a refrigerating system by starting to open at a set refrigerant
pressure and re-closing after the pressure has fallen
3.170
bursting disc
disc or foil which bursts at a predetermined pressure to avoid an overpressure in the
refrigerating system
3.171
mechanical joint
piping joint in a refrigerating system which is not brazed or welded
5 General conditions for the tests
5.2 Add the following new text:
Unless the motor-compressor complies with IEC 60335-2-34, additional samples can be
required.
If the motor-compressor complies with IEC 60335-2-34 and is classified as not being protected
by a motor-compressor protection system, then at least one additional specially prepared
sample is required for the test of 19.7.
5.7 Replace the existing text of the addition with the following:
The tests of Clause 10 and Clause 11 are carried out under the most unfavourable temperature
conditions within the operating temperature range specified by the manufacturer. Annex AA
provides examples of such temperature conditions.
7 Marking and instructions
7.1 Add, as a first paragraph, the following new text:
Where safety group per ISO 817 is mentioned in this clause for blends with dual classification,
the classification based on WCF shall be used.
NOTE 101 Where dual classification exists in ISO 817, the WCF is the least restrictive of the classifications. The
tables with ISO 817 refrigerant data are provided at https://standards.iso.org/iso/817/ma/en/.
Renumber the existing NOTE 101 as NOTE 102.
Replace, in the penultimate paragraph of the addition, "that it is visible during normal operation."
with "that it is visible during normal use and storage".
7.108 Delete, in the first paragraph, the word "A2L".
8 Protection against access to live parts
8.1.1 Replace the existing addition with the following:
Modification:
Replace the penultimate paragraph of Part 1 with the following:
Test probe 18 of IEC 61032 is not applied to appliances not accessible to the general public.
Test probe 18 of IEC 61032 is not applied to parts of appliances situated at a height exceeding
1,8 m above the floor after installation or in normal use.
For appliances accessible to the general public, parts situated not more than 850 mm above
the floor after installation or in normal use, in addition to the use of test probe 18 of IEC 61032,
test probe 19 of IEC 61032 shall also be applied wherever test probe 18 of IEC 61032 is used
and with the same test conditions used for test probe 18 of IEC 61032.
11 Heating
Table 3 – Maximum normal temperature rises
Replace, in the existing footnote aa, "IEC 60335-2-34:2021" with "IEC 60335-2-34:2024".
19 Abnormal operation
19.7 Replace the existing text of the addition to the last paragraph with the following:
If the motor-compressor:
• has not been type-tested against the requirements of IEC 60335-2-34, or
• is complying with IEC 60335-2-34 and classified as not being protected by a motor-
compressor protection system,
then it shall be subject to the following test.
A sample shall be provided with the rotor locked and being filled with oil and refrigerant as
intended. The sample shall then be subjected to the tests specified in lEC 60335-2-34:2024,
19.101, 19.102, and 19.103 if applicable, and shall comply with the requirements in
IEC 60335-2-34:2024, 19.104. Three-phase motor-compressors directly supplied by the mains
shall be subjected to the test specified in lEC 60335-2-34:2024, 19.105 if applicable.
19.13 Add, after the last paragraph, the following new addition:
Addition after the eighth paragraph:
Outlets or connectors for a special purpose, are excluded from this requirement. The no-load
output voltage shall not exceed 42,4 V for DC and a peak value of 42,4 V for AC.
NOTE 101 Examples for "connectors for a special purpose" are outlets and connectors for accessories or external
temperature sensors, with plugs provided by the manufacturer or with a screw terminal. Connectors common in
consumer electronic are not considered to be "connectors for a special purpose".
19.106 Replace the existing text of the fourth paragraph and Note 3 with the following:
If the two walls separating secondary circuit and refrigeration circuit are brazed or welded
together in some areas where water can be entrapped and break the heat exchanger by
expansion due to freezing, then the following shall be tested with all control functions to avoid
freezing disabled:
1) The appliance shall run under stable conditions. The volume flow shall be monitored.
2) The circulation pump on the evaporator shall be switched off.
3) The appliance shall run for 5 min, then the compressor shall be switched off and the
circulation pump shall be switched on.
4) 5 min after the volume flow reached the initial value, the compressor shall restart.
NOTE 3 If the appliance allows to reverse the cycle this can be used for unfreezing the heat exchanger
NOTE 4 A resistor can offset a temperature sensor to simulate a faulty sensor
Delete, in the fifth paragraph, "the control system detects an error,".
Renumber the existing NOTE 4 as NOTE 5.
20 Stability and mechanical hazards
20.2 Replace the existing addition with the following:
Modification:
Replace the second paragraph of the test specification of Part 1 with the following:
Test probe 18 of IEC 61032 is not applied to appliances not accessible to the general public.
Test probe 18 of IEC 61032 is not applied to parts of appliances situated at a height exceeding
1,8 m above the floor after installation or in normal use.
For appliances accessible to the general public, parts situated not more than 850 mm above
the floor after installation or in normal use, in addition to the use of test probe 18 of IEC 61032,
test probe 19 of IEC 61032 shall also be applied wherever test probe 18 is used and with the
same test conditions used for test probe 18 of IEC 61032.
For non-metallic fan guards, testing with test probes is done directly after the testing of 11.7.
21 Mechanical strength
21.1 Replace the existing text with the following:
Addition after third paragraph:
For non-metallic parts of outdoor enclosures, the spring hammer test is carried out under the
lowest operating temperature specified by the manufacturer after being preconditioned at this
temperature for 24 h.
21.102 Replace the first indent in the third paragraph with the following text and Note:
– on a closed intermediate chamber: on the intermediate chamber with both the water and
refrigerant sides open to the atmosphere;
NOTE A specially prepared sample with a pressure port can be used.
Add, after 21.102, the following new subclause:
21.103 The pressure test in Annex EE applies to all parts of the refrigerating system, except
for motor-compressors complying with the IEC 60335-2-34.
22 Construction
22.112 Replace the existing text with the following:
The materials of the refrigerating system shall comply with the requirements of
ISO 5149-2:2014, 4.3.
The arrangement of the pressure protection devices for the refrigerating system shall comply
with the requirements in ISO 5149-2:2014, 5.2.9.1, 5.2.9.2, 5.2.9.3 and 5.2.9.4, including
ISO 5149-2:2014/AMD1:2020, 5.2.9.2. If pressure-limiting devices are used, the set-point
including deviation and drift shall not exceed the maximum allowable pressure.
Refrigerant piping and joints shall comply with the construction requirements of
ISO 5149-2:2014, 5.2.3, including ISO 5149-2:2014/AMD1:2020.
NOTE Joint is named fitting in ISO 5149-2.
Compliance is checked by inspection.
22.117.1 Replace the existing text with the following:
Temperatures on surfaces that can be exposed to leakage of flammable refrigerants in excess
of 25 % of LFL as determined in Annex FF shall not exceed the maximum allowable surface
temperature.
For A2 and A3 refrigerants, the maximum allowable surface temperature is the AIT, according
to ISO 817.
For A2L refrigerants, the maximum allowable surface temperature is determined by the higher
of AIT or, if tested per Annex KK, the hot surface ignition temperature reduced by 100 K, but
no more than 700 °C. The AIT and hot surface ignition temperature shall be according to
ISO 817 and Annex BB respectively.
NOTE The tables with ISO 817 refrigerant data are provided at https://standards.iso.org/iso/817/ma/en/.
Compliance for A2 and A3 refrigerants is checked by measuring the appropriate surface
temperatures during the tests of Clause 11 and Clause 19. Except tests of Clause 19 that are
terminated in a non-self-resetting way where the surface temperature does not exceed the
maximum allowable temperature for more than 30 min. The measurement starts when the fault
condition is applied and ends when steady state conditions are reached and the maximum
allowable surface temperature is not exceeded.
Compliance for A2L refrigerants is checked by measuring the appropriate surface
temperatures during the tests of Clause 11.
Surfaces in compliance with 22.117 shall not be considered a potential ignition source.
Refrigerant sensors tested and found to comply with IEC TS 63542:2024 are considered to
comply with 22.117.
22.121
22.121.1 Replace, in the last paragraph, "Annex QQ." with "Annex QQ or, for compliance, with
GG.4.2.3.".
22.121.2 Replace, in the third paragraph, "Annex QQ." with "Annex QQ or, for compliance,
with GG.4.2.3.".
22.122 Replace the existing first dashed item with the following:
– the output signal of the refrigerant detection system shall be used to activate the
actions required to comply with Annex GG in the event of a leak;
Replace the existing second and third paragraphs with the following:
Compliance is checked by inspection.
Add, after 22.135, the following new subclauses:
22.136 For periodic validation of fan operation:
22.136.1 When an airflow or ventilation that is needed to comply with Annex GG for A2L
refrigerants and is activated by a leak detection system and the fan providing it is not
activated under normal operation, the airflow shall be periodically checked and detected and
the appliance or the motor compressor is switched off within 10 s in the event that the airflow
is reduced below Q .
min
Compliance is checked by inspection.
22.136.2 When an airflow or ventilation that is needed to comply with Annex GG for A2 and
A3 refrigerants and is activated by a leak detection system and the fan providing it is not
activated under normal operation, the appliance shall have an automatic function for validation
of function of the fan:
– after the appliance power up before the first activation of the compressor in heating or
cooling function, and
– regularly thereafter at intervals not exceeding 14 calendar days.
If the check fails, the appliance shall:
– warn user that airflow for safe operation is not available;
– disable the compressor operation unless the compressor operation reduces the leak rate or
the total amount released to the indoor space.
Compliance is checked by inspection.
22.137 Piping joints in the refrigerating system shall be designed so that they will not be
damaged because of freezing of water on the outside of the joint. Welded or brazed joints are
in compliance with this requirement.
Mechanical joints which are subjected to temperatures below 0 °C during normal operation
under the most severe operating conditions within the operating temperature range specified
by the manufacturer, shall pass the test of ISO 14903:2025, 7.8 "Freezing test".
Compliance is checked by inspection or testing.
22.138 A refrigerating pressure relief device that protects a refrigerating system, or part
of it, shall be set at a pressure less than or equal to the maximum allowable pressure and
shall be fully opened at a pressure less than or equal to 10 % above the maximum allowable
pressure.
If a refrigerant pressure relief device is provided, the difference between the setting of the
refrigerant pressure-limiting device and the refrigerant pressure relief device shall be
sufficient that the refrigerant pressure-limiting device deactivates the compressor before the
refrigerant pressure relief device operates. The tolerances shall be taken into consideration.
Compliance is checked by inspection or testing.
A refrigerant pressure relief device relieving to the low-pressure side of a refrigerating
system shall comply with
– the relief path between high side and low side of the system cannot be shut off except as
specified in ISO 5149-2:2014, 5.2.9.4 and
– the pressure in the low-pressure side shall not exceed the low-pressure side maximum
operating pressure by more than 10 % during the discharge of the refrigerant pressure
relief device.
Compliance is checked by inspection.
22.139 The pressure in parts protected by a refrigerant pressure relief device shall not
exceed 0,9 times the setting of that device during storage and transport.
...