IEC 60335-2-40:2022
(Main)Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers
Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers
IEC 60335-2-40:2022 deals with the safety of electric heat pumps, sanitary hot water heat pumps and air conditioners, incorporating motor-compressors as well as hydronic fan coils units, dehumidifiers (with or without motor-compressors), thermoelectric heat pumps and partial units. Their maximum rated voltage being not more than 300 V for single phase appliances and 600 V for multi-phase appliances. Appliances not intended for normal household use but which nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. The appliances referenced above can consist of one or more factory-made assemblies. If provided in more than one assembly, the separate assemblies are used together, and the requirements are based on the use of matched assemblies. This document does not take into account refrigerants other than group A1, A2L, A2 and A3 as defined by ISO 817. Flammable refrigerants are limited to those of a molar mass of more than or equal to 42 kg/kmol based on WCF (worst case formulation) as specified in ISO 817. As far as practical, this document deals with common hazards presented by appliances that are encountered in normal use and assumes that installation, servicing, decommissioning, and disposal are safely handled by competent persons and accidental release of refrigerants is avoided. However, it does not prescribe the criteria to ensure competence of persons during installation, servicing and disposal. Safety requirements during disposal are not specified in this standard. Supplementary heaters, or a provision for their separate installation, are within the scope of this standard, but only heaters which are designed as a part of the appliance package, the controls being incorporated in the appliance. Attention is drawn to the fact that
- for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be necessary;
- in many countries, additional requirements are specified, for example, by the national health authorities responsible for the protection of labour and the national authorities responsible for storage, transportation, building constructions and installations.
This document does not apply to
- humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88);
- appliances designed exclusively for industrial processing;
- appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas).
This seventh edition cancels and replaces the sixth edition published in 2018. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- Clause 1: added thermoelectric heat pumps to the scope and increased maximum rated voltage to 300 V for single phase appliances;
- Clause 7: revised requirements for marking on the appliance and packaging, including a symbol for minimum floor area and modifying the symbol for flammable refrigerants to include the safety group per ISO 817;
- Clause 11 and Clause 19: restructured for alignment with Part 1 and added requirements for supplementary air heaters;
- Clause 13 and Clause 16: revised requirement for leakage current for stationary class I motor-operated appliances;
- Clause 21: added requirements for particle foam material and revised requirements for transport testing;
- Clause 22: removed limit on the sum of refrigerant charges for appliances with multiple refrigerating systems, and revised requirements for avoiding ignition sources, leak detection systems, safety shut-off valves, and particle foam material;
- Clause 23: added requirements to avoid contact between wires and refrigerant piping;
- Clause 24
The content of the corrigendum 1 (2024-10) has been included in this copy.
Appareils électrodomestiques et analogues - Sécurité - Partie 2-40: Exigences particulières pour les pompes à chaleur électriques, les climatiseurs et les déshumidificateurs
L'IEC 60335-2-40:2022 traite de la sécurité des pompes à chaleur électriques, des pompes à chaleur pour production d'eau chaude sanitaire et des climatiseurs qui comportent des motocompresseurs ainsi que des ventiloconvecteurs hydroniques, des déshumidificateurs (avec ou sans motocompresseur), des pompes à chaleur thermoélectriques et des unités partielles. Leur tension assignée maximale n’est pas supérieure à 300 V pour les appareils monophasés et à 600 V pour les appareils multiphasés. Les appareils non destinés à un usage domestique normal, mais qui néanmoins peuvent constituer une source de danger pour le public, tels que les appareils destinés à être utilisés par des usagers non avertis dans des magasins, chez des artisans et dans des fermes, sont compris dans le domaine d'application de la présente norme. Les appareils indiqués ci-dessus peuvent consister en un ou plusieurs ensembles fabriqués en usine. Si les appareils sont fournis en plusieurs ensembles, les ensembles doivent être utilisés conjointement et les exigences correspondantes dépendent de l'utilisation des ensembles assortis. La présente norme ne couvre pas les fluides frigorigènes qui n'appartiennent pas aux groupes A1, A2L, A2 et A3 tels qu'ils sont définis par l’ISO 817. Les fluides frigorigènes inflammables se limitent à ceux dont la masse molaire est supérieure ou égale à 42 kg/kmol d'après la formule "la plus défavorable" (WCF, Worst Case Formulation) spécifiée dans l'ISO 817. Dans la mesure du possible, la présente norme traite des dangers courants engendrés par les appareils qui sont rencontrés dans le cadre d'une utilisation normale et elle suppose que l'installation, l'entretien, la mise hors service et l'élimination sont effectués en toute sécurité par des personnes compétentes et que le dégagement accidentel de fluides frigorigènes est évité. Toutefois, elle ne prescrit pas les critères qui permettent de garantir la compétence des personnes lors de l'installation, de l'entretien et de l'élimination. Les exigences de sécurité pendant l'élimination ne sont pas spécifiées dans la présente norme. Les dispositifs de chauffage supplémentaires (ou les dispositions concernant leur installation) sont couverts par le domaine d'application de la présente norme, mais uniquement les dispositifs de chauffage qui sont conçus en tant que partie de l'appareil, les commandes étant incorporées à l'appareil. L'attention est attirée sur le fait que
- pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d'avions, des exigences supplémentaires peuvent être nécessaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées par exemple par les organismes nationaux de la santé publique responsables de la protection des travailleurs et par les organismes nationaux responsables du stockage, du transport, de la construction des bâtiments et des installations.
La présente norme ne s'applique pas
- aux humidificateurs destinés à être utilisés avec des appareils de chauffage et de refroidissement (IEC 603352-88);
- aux appareils prévus exclusivement pour des usages industriels;
- aux appareils destinés à être utilisés dans des locaux présentant des conditions particulières, telles que la présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz).
Cette septième édition annule et remplace la sixième édition parue en 2018. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Article 1: ajout des pompes à chaleur thermoélectriques au domaine d'application et augmentation de la tension assignée maximale à 300 V pour les appareils monophasés;
- Article 7: révision des exigences relatives au marquage sur l'appareil et l'emballage, y compris un symbole relatif à la surface au sol minimale, et modification du symbole relatif aux fluides frigorigènes inflammables afin d'inclure le groupe de sécurité selon l’ISO
General Information
Relations
Overview
IEC 60335-2-40:2022 is the seventh-edition IEC safety standard for electrical heat pumps, air‑conditioners and dehumidifiers used in household and similar environments. It specifies particular safety requirements for appliances incorporating motor‑compressors, hydronic fan‑coil units, thermoelectric heat pumps, partial units and dehumidifiers (with or without compressors). The extended edition includes references to IEC 60335-1 and incorporates Corrigendum 1 (2024‑10). Rated-voltage limits: ≤ 300 V single‑phase and ≤ 600 V multi‑phase. The standard covers appliances used by laymen in shops, light industry and farms, but excludes dedicated industrial processing equipment and devices for explosive or corrosive atmospheres.
Key topics and requirements
- Scope of refrigerants: Applies to refrigerants in groups A1, A2L, A2 and A3 as defined by ISO 817. Flammable refrigerants are limited to those with molar mass ≥ 42 kg/kmol (WCF basis).
- Design and construction: Requirements for components, internal wiring, clearances, creepage distances, particle foam materials and mechanical strength.
- Electrical safety: Leakage current, electric strength tests, transient overvoltages, motor starting and overload protection; revised leakage current rules for stationary class I appliances.
- Flammable refrigerant safety: Charge limits, ventilation and secondary circuits, avoidance of ignition sources, leak detection systems, safety shut‑off valves, flame arrest enclosures and hot‑surface ignition testing (several normative annexes).
- Marking & instructions: Updated marking requirements including floor‑area symbol and refrigerant safety group per ISO 817; field‑charge labelling for units supplied uncharged.
- Testing & transport: Transport and vibration tests, leak simulation, proof testing and methods for determining releasable charge; Annexes detail test methods (e.g., leak detection, sensor location, flame arrest verification).
- Service & installation: Requirements for installation, service and repair manuals for appliances using flammable refrigerants are specified (normative annexes), though the standard does not set competence criteria for service personnel.
Applications
IEC 60335-2-40 is used to certify and design:
- Residential and light‑commercial heat pump systems (including sanitary hot water heat pumps)
- Split and packaged air‑conditioners, hydronic fan‑coil units
- Domestic and commercial dehumidifiers
- Thermoelectric cooling units and partial assemblies intended to be matched in factory configurations
Compliance supports product safety, market access, third‑party certification and risk mitigation for appliances using flammable or non‑flammable refrigerants.
Who should use this standard
- Product designers and manufacturers of heat pumps, air‑conditioners and dehumidifiers
- Compliance engineers, test laboratories and certification bodies
- Regulatory authorities, consultants and HVAC installers specifying safe equipment for homes and light commercial sites
Related standards
- IEC 60335-1 (General requirements for household electrical appliance safety)
- ISO 817 (Classification and safety groups of refrigerants)
- IEC 60335-2-88 (humidifiers) - excluded scope reference
Keywords: IEC 60335-2-40, electrical heat pumps safety, air‑conditioner safety standard, dehumidifier safety, A2L refrigerants, refrigerant charge limits, leak detection, IEC 60335-1.
Standards Content (Sample)
IEC 60335-2-40 EXV ®
Edition 7.0 2022-09
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-40:2022 includes the content of the references made to
IEC 60335-1:2010+AMD1:2013+AMD2:2016 CSV
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
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IEC 60335-2-40 EXV ®
Edition 7.0 2022-09
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-40 includes the content of the references made to
IEC 60335-1:2010+AMD1:2013+AMD2:2016 CSV
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners
and dehumidifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.120 ISBN 978-2-8322-5674-9
IEC 60335-1:2010/AMD2:2016/ – 1 –
ISH1:2020 IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 5.0 2010-05
Amendment 2: 2016-05
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 1: General requirements
INT ERPRET AT ION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 61: Safety of
household and similar electrical appliances.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
TC 61 interpretation sheet on: Detachable power supply parts of IEC 60335-1:2010/
AMD2:2016
Introduction
Amendment 2 of IEC 60335-1:2010 defines and introduces requirements for a detachable
power supply part of an appliance. In this amendment, 24.2 prohibits the use of a power
supply in a flexible cord.
QUESTION:
Does Subclause 24.2 prohibit the use of a detachable power supply part?
ANSWER
No, a “detachable power supply part” is a defined term and is not captured by term “power
supply” as used in Subclause 24.2.
ICS 13.120; 97.030
IEC 60335-1:2010-05/AMD2:2016-05/ISH1:2020-04(en-fr)
– 2 – IEC 60335-1:2010/AMD2:2016/
ISH1:2020 IEC 2020
NOTE A detachable power supply part is captured by the defined term when the output of the power supply part is
detachable from the class III construction part of the appliance at:
– the power supply part, or
– the class III construction part of the appliance.
However, the supply cord (if any) does not have to be detachable from the detachable power supply part.
– 2 – IEC 60335-2-40:2022 EXV IEC 2022
CONTENTS
FOREWORD .7
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 17
4 General requirement . 32
5 General conditions for the tests . 32
6 Classification . 36
7 Marking and instructions . 36
8 Protection against access to live parts . 49
9 Starting of motor-operated appliances . 51
10 Power input and current . 51
11 Heating . 53
12 Void . 60
13 Leakage current and electric strength at operating temperature . 60
14 Transient overvoltages . 62
15 Moisture resistance . 63
16 Leakage current and electric strength . 64
17 Overload protection of transformers and associated circuits . 66
18 Endurance . 66
19 Abnormal operation . 66
20 Stability and mechanical hazards . 80
21 Mechanical strength . 81
22 Construction . 83
23 Internal wiring . 107
24 Components . 109
25 Supply connection and external flexible cords . 114
26 Terminals for external conductors . 122
27 Provision for earthing . 124
28 Screws and connections . 126
29 Clearances, creepage distances and solid insulation . 129
30 Resistance to heat and fire . 137
31 Resistance to rusting. 142
32 Radiation, toxicity and similar hazards . 142
Annex A (informative) Routine tests . 162
Annex B (normative) Appliances powered by rechargeable batteries that are recharged
in the appliance. 164
Annex C (normative) Ageing test on motors . 169
Annex D (normative) Thermal motor protectors . 170
Annex E (normative) Needle-flame test . 171
Annex F (normative) Capacitors. 172
Annex G (normative) Safety isolating transformers . 174
Annex H (normative) Switches . 175
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 177
Annex J (normative) Coated printed circuit boards . 178
Annex K (normative) Overvoltage categories . 179
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 180
Annex M (normative) Pollution degree . 184
Annex N (normative) Proof tracking test . 185
Annex O (informative) Selection and sequence of the tests of Clause 30 . 186
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 192
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 194
Annex R (normative) Software evaluation. 196
Annex S (normative) Battery-operated appliances powered by batteries that are
non-rechargeable or not recharged in the appliance . 210
Annex T (normative) UV-C radiation effect on non-metallic materials . 213
Annex AA (informative) Examples for operating temperatures of the appliance . 216
Annex CC (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 221
Annex DD (normative) Requirements for installation, service, maintenance and repair,
and decommissioning manuals of appliances using flammable refrigerants . 222
Annex EE (normative) Pressure tests . 231
Annex FF (normative) Leak simulation tests . 233
Annex GG (normative) Charge limits, ventilation requirements and requirements for
secondary circuits . 235
Annex HH (informative) Competence of service personnel . 268
Annex II (Void) . 270
Annex JJ (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 271
Annex KK (normative) Test method for hot surface ignition temperature for A2L . 273
Annex LL (normative) Refrigerant detection systems for flammable refrigerants . 277
Annex MM (normative) Refrigerant sensor location confirmation test. 288
Annex NN (normative) Flame arrest enclosure verification test for A2L refrigerants . 291
Annex OO (Void) . 293
Annex PP (normative) Leak detection system confirmation test for flammable
refrigerants . 294
Annex QQ (normative) Methods for determining releasable charge . 300
Bibliography . 308
Index of defined terms . 308
– 4 – IEC 60335-2-40:2022 EXV IEC 2022
Figure 1 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of class II appliances and for parts of class ll construction . 144
Figure 2 – Circuit diagram for leakage current measurement at operating temperature for
single-phase connection of other than class II appliances or parts of class ll construction . 145
Figure 3 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral class II appliances and for parts of class ll construction . 146
Figure 4 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral appliances other than those of class II or parts of class ll
construction . 147
Figure 5 – Small part . 148
Figure 6 – Example of an electronic circuit with low-power points . 149
Figure 7 – Test finger nail . 150
Figure 8 – Flexing test apparatus . 151
Figure 9 – Constructions of cord anchorages . 152
Figure 10 – An example of parts of an earthing terminal . 153
Figure 11 – Examples of clearances . 154
Figure 12 – Example of the placement of the cylinder . 155
Figure 13 – Small parts cylinder . 156
Figure 101 – Example of label for field charged units . 157
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 159
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type –
Revise as needed for three-phase test . 160
Figure 104 – Power spectral density profile for vibration test in 21.101 . 160
Figure 105 – Dimensional details for the weight in the area of the pressure ball . 160
Figure 106 – Measurement before and after the test . 161
Figure B.1 – Examples of forms of constructions for appliances covered by Annex B . 167
Figure L.1 – Sequence for the determination of clearances . 181
Figure L.2 – Sequence for the determination of creepage distances . 183
Figure O.1 – Tests for resistance to heat . 186
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 187
Figure O.3 – Selection and sequence of tests for resistance to fire in attended appliances . 188
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended
appliances . 189
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 191
Figure S.1 – Examples of battery marking representing three batteries . 212
Figure GG.1 – Unventilated area . 265
Figure GG.2 – Mechanical ventilation . 265
Figure GG.3 – Relevant heights h , h and h for calculation of A and m . 266
inst 0 rel min max
Figure GG.4 – Airflow direction . 267
Figure KK.1 – Front view of test apparatus labels . 273
Figure KK.2 – Test apparatus with dimensions . 274
Figure KK.3 – Top view of test apparatus . 275
Figure LL.1 – Example of test chamber design . 283
Table 1 – Power input deviation . 51
Table 2 – Current deviation . 52
Table 3 – Maximum normal temperature rises . 56
Table 4 – Voltage for electric strength test . 62
Table 5 – Characteristics of high-voltage sources. 62
Table 6 – Impulse test voltage . 63
Table 7 – Test voltages . 65
Table 8 – Maximum winding temperature . 69
Table 9 – Maximum abnormal temperature rise . 75
Table 10 – Dimensions of cables and conduits . 115
Table 11 – Minimum cross-sectional area of conductors . 117
Table 12 – Pull force and torque . 119
Table 13 – Nominal cross-sectional area of conductors . 123
Table 14 – Torque for testing screws and nuts . 128
Table 15 – Rated impulse voltage . 130
Table 16 – Minimum clearances . 130
Table 17 – Minimum creepage distances for basic insulation . 134
Table 18 – Minimum creepage distances for functional insulation . 135
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting of
a single layer . 137
Table 101 – Power spectral density profile for vibration test . 83
Table 102 – UV-C spectral irradiance measurement location . 143
Table A.1 – Test voltages . 163
Table C.1 – Test conditions . 169
Table R.1 – General fault/error conditions . 198
Table R.2 – Specific fault/error conditions . 201
Table R.3 – Semi-formal methods . 207
Table R.4 – Software architecture specification . 207
Table R.5 – Module design specification . 208
Table R.6 – Design and coding standards . 208
Table R.7 – Software safety validation . 209
Table S.101 – Battery source impedance . 211
Table T.1 – Minimum property retention limits after UV-C exposure . 214
Table T.2 – Minimum electric strength for internal wiring after UV-C exposure . 215
Table AA.1 – Examples for operating temperatures of the appliance . 216
Table BB.1 – Selected information about refrigerants . 217
Table DD.1 – Mandatory clauses in each manual . 222
Table GG.1 – Outline of Annex GG (informative) . 236
Table GG.2 – Circulation airflow . 241
Table GG.3 – Appliance with packaging . 248
Table GG.4 – Appliance without packaging . 248
Table GG.5 – Minimum air velocity . 260
Table GG.6 – Refrigerant leak rate (ṁ ) . 263
leak
– 6 – IEC 60335-2-40:2022 EXV IEC 2022
Table LL.1 – Relationship among alarm set point, tolerance and test gas (informative) . 279
Table LL.2 – Gas and vapour concentrations . 281
Table LL.3 – Example of the test chamber design . 284
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
FOREWORD
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This extended version (EXV) of the official IEC Standard provides the user with a
comprehensive content of the Standard.
its Amendment 1:2013 and its Amendment 2:2016.
Particular subclauses of IEC 60335-1:2010+AMD1:2013+AMD2:2016 CSV are displayed in
the content on a blue background.
– 8 – IEC 60335-2-40:2022 EXV IEC 2022
IEC 60335 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 an International Standard.
This seventh edition cancels and replaces the sixth edition published in 2018. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– Clause 1 – added thermoelectric heat pumps to the scope and increased maximum rated
voltage to 300 V for single phase appliances;
– Clause 7 – revised requirements for marking on the appliance and packaging, including a
symbol for minimum floor area and modifying the symbol for flammable refrigerants to
include the safety group per ISO 817;
– Clause 11 and Clause 19 – restructured for alignment with Part 1 and added requirements
for supplementary air heaters;
– Clause 13 and Clause 16 – revised requirement for leakage current for stationary class I
motor-operated appliances;
– Clause 21 – added requirements for particle foam material and revised requirements for
transport testing;
– Clause 22 – removed limit on the sum of refrigerant charges for appliances with multiple
refrigerating systems, and revised requirements for avoiding ignition sources, leak
detection systems, safety shut-off valves, and particle foam material;
– Clause 23 – added requirements to avoid contact between wires and refrigerant piping;
– Clause 24 – revised requirements for motor-compressors;
– Clause 30 – added requirements for resistance to heat of particle foam material;
– Annex BB – revised Table BB.1 with refrigerant information and added a link to ISO 817
refrigerant data;
– Annex DD – revised requirements for information in the manual for appliances with
flammable refrigerants;
– Annex EE – revised requirements for pressure testing;
– Annex FF – revised requirements for leak simulation tests;
– Annex GG – added requirements for applying releasable charge, added additional
coverage for A2 and A3 refrigerants, including new charge limits for appliances with
circulation airflow and for enhanced tightness refrigerating systems, and revised
requirements for enhanced tightness refrigerating systems using A2L refrigerant;
– Annex LL – revised requirements for refrigerant detection systems;
– Annex MM – revised simulated leak rate;
– Annex OO – deleted annex for conditioning internal wiring using UV light.
– Annex PP – new coverage of leak detection system confirmation test;
– Annex QQ – new coverage of method for determining releasable charge.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/491/FDIS 61D/493/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 International Standard 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.
This part 2-40 is to be used in conjunction with IEC 60335-1:2010, its Amendment 1:2013 and
its Amendment 2:2016.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This part 2-40 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electrical heat pumps,
air-conditioners and dehumidifiers.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
• subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
• unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
• additional annexes are lettered AA, BB, etc.
NOTE 3 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.
The following differences exist in the countries indicated below:
• 6.1: Class 0I appliances are allowed (Japan).
• 11.8: The temperature of the wooden walls in the test casing is limited to 85 °C (Sweden).
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
– 10 – IEC 60335-2-40:2022 EXV IEC 2022
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the instructions. It also covers abnormal situations that can be expected
in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules can differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard 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 the
standard.
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
1 Scope
This part of IEC 60335 deals with the safety of electric heat pumps, sanitary hot water heat
pumps and air conditioners, incorporating motor-compressors as well as hydronic fan coils
units, dehumidifiers (with or without motor-compressors), thermoelectric heat pumps and
partial units. Their maximum rated voltage being not more than 300 V for single phase
appliances and 600 V for multi-phase appliances.
Appliances not intended for normal household use but which nevertheless can be a source of
danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
The appliances referenced above can consist of one or more factory-made assemblies. If
provided in more than one assembly, the separate assemblies are used together, and the
requirements are based on the use of matched assemblies.
NOTE 101 A definition of ‘motor-compressor’ is given in IEC 60335-2-34, which includes the statement that the
term motor-compressor is used to designate either a hermetic motor-compressor or semi-hermetic motor-compressor.
NOTE 102 Requirements for containers intended for storage of the heated water included in sanitary hot water
heat pumps are, in addition, covered by IEC 60335-2-21.
This standard does not take into account refrigerants other than group A1, A2L, A2 and A3 as
defined by ISO 817. Flammable refrigerants are limited to those of a molar mass of more than
or equal to 42 kg/kmol based on WCF (worst case formulation) as specified in ISO 817.
As far as practical, this standard deals with common hazards presented by appliances that are
encountered in normal use and assumes that installation, servicing, decommissioning, and
disposal are safely handled by competent persons and accidental release of refrigerants is
avoided. However, it does not prescribe the criteria to ensure competence of persons during
installation, servicing and disposal. Safety requirements during disposal are not specified in
this standard.
NOTE 103 Annex HH provides informative requirements on competence of persons. Criteria for competence of
personnel for the purpose of certification schemes can be found in ISO 22712 .
Unless specifications are covered by this standard, including the annexes, requirements for
refrigerating safety are covered by:
– ISO 5149-1:2014, ISO 5149-1:2014/AMD1:2015, and ISO 5149-1:2014/AMD2:2021,
– ISO 5149-2:2014 and ISO 5149-2:2014/AMD1:2020,
– ISO 5149-3:2014 and ISO 5149-3:2014/AMD1:2021.
Supplementary heaters, or a provision for their separate installation, are within the scope of
this standard, but only heaters which are designed as a part of the appliance package, the
controls being incorporated in the appliance.
___________
Under preparation. Stage at the time of publication: ISO FDIS 22712:2022
– 12 – IEC 60335-2-40:2022 EXV IEC 2022
NOTE 104 Attention is drawn to the fact that
• for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be
necessary;
• in many countries, additional requirements are specified, for example, by the national health authorities
responsible for the protection of labour and the national authorities responsible for storage, transportation,
building constructions and installations.
NOTE 105 This standard does not apply to
• humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88);
• appliances designed exclusively for industrial processing;
• appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive
or explosive atmosphere (dust, vapour or gas).
2 Normative references
IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
IEC 60061-1, Lamp caps and holders together with gauges for the control of interchangeability
and safety – Part 1: Lamp caps
IEC 60065:2001, Audio, video and similar electronic apparatus – Safety requirements
2)
Amendment 1 (2005)
IEC 60068-2-2, Environmental testing – Part 2-2: Tests –Test B: Dry heat
IEC 60068-2-31, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling shocks,
primarily for equipment-type specimens
IEC 60068-2-52, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium,
chloride solution)
IEC 60068-2-75, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-7:2015, Explosive atmospheres − Part 7: Equipment protection by increased safety
"e"
IEC 60079-7:2015/AMD1:2017
IEC 60079-14:2013, Explosive atmospheres − Part 14: Electrical installations design, selection
and erection
IEC 60079-15:2017, Explosive atmospheres – Part 15: Equipment protection by type of
protection "n"
IEC/TR 60083, Plugs and socket-outlets for domestic and similar general use standardized in
member countries of IEC
IEC 60085:2007, Electrical insulation – Thermal evaluation and designation
IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
3)
Amendment 1 (2009)
IEC 60127 (all parts), Miniature fuses
___________
2)
There exists a consolidated edition 7.1 (2005) that includes edition 7 and its Amendment 1.
3)
There exists a consolidated edition 4.1 (2009) that includes edition 4 and its Amendment 1.
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
IEC 60238, Edison screw lampholders
IEC 60245 (all parts), Rubber insulated cables – Rated voltages up to and including 450/750 V
IEC 60252-1, AC motor capacitors – Part 1: General – Performance testing and rating – Safety
requirements – Guide for installation and operation
IEC 60309 (all parts), Plugs, socket-outlets and couplers for industrial purposes
IEC 60320-1, Appliance couplers for household and similar general purposes – Part 1: General
requirements
IEC 60320-2-
...
IEC 60335-2-40 ®
Edition 7.0 2022-05
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
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IEC 60335-2-40 ®
Edition 7.0 2022-05
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners
and dehumidifiers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.120 ISBN 978-2-8322-3458-7
– 2 – IEC 60335-2-40:2022 CMV © IEC 2022
CONTENTS
FOREWORD .5
INTRODUCTION .8
1 Scope .9
2 Normative references . 10
3 Terms and definitions . 12
4 General requirement . 20
5 General conditions for the tests . 20
6 Classification . 21
7 Marking and instructions . 21
8 Protection against access to live parts . 28
9 Starting of motor-operated appliances . 28
10 Power input and current . 28
11 Heating . 29
12 Void . 35
13 Leakage current and electric strength at operating temperature . 35
14 Transient overvoltages . 36
15 Moisture resistance . 36
16 Leakage current and electric strength . 37
17 Overload protection of transformers and associated circuits . 37
18 Endurance . 37
19 Abnormal operation . 37
20 Stability and mechanical hazards . 45
21 Mechanical strength . 45
22 Construction . 46
23 Internal wiring . 60
24 Components . 61
25 Supply connection and external flexible cords . 62
26 Terminals for external conductors . 62
27 Provision for earthing . 62
28 Screws and connections . 62
29 Clearances, creepage distances and solid insulation . 62
30 Resistance to heat and fire . 63
31 Resistance to rusting. 64
32 Radiation, toxicity and similar hazards . 64
Annexes . 73
Annex D (normative) Thermal motor protectors . 73
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 73
Annex AA (informative) Examples for operating temperatures of the appliance . 74
Annex BB (normative) Selected information about refrigerants . 75
Annex CC (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 79
Annex DD (normative) Requirements for operation, service and installation, service,
maintenance and repair, and decommissioning manuals of appliances using flammable
refrigerants . 80
Annex EE (normative) Pressure tests . 92
Annex FF (normative) Leak simulation tests . 95
Annex GG (normative) Charge limits, ventilation requirements and requirements for
secondary circuits . 97
Annex HH (informative) Competence of service personnel . 138
Annex II (Void) . 141
Annex JJ (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 142
Annex KK (normative) Test method for hot surface ignition temperature for A2L . 144
Annex LL (normative) Refrigerant detection systems for A2L flammable refrigerants . 148
Annex MM (normative) Refrigerant sensor location confirmation test. 160
Annex NN (normative) Flame arrest enclosure verification test for A2L refrigerants . 164
Annex OO (normative) UV radiation conditioning (Void) . 166
Annex PP (normative) Leak detection system confirmation test for flammable
refrigerants . 167
Annex QQ (normative) Methods for determining releasable charge . 173
Bibliography . 181
List of comments . 183
Figure 101 – Example of label for field charged units . 66
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 70
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type –
Revise as needed for three-phase test . 71
Figure 104 – Power spectral density profile for vibration test in 21.101 . 71
Figure 105 – Dimensional details for the weight in the area of the pressure ball . 72
Figure 106 – Measurement before and after the test . 72
Figure GG.1 – Unventilated area . 133
Figure GG.2 – Mechanical ventilation . 134
Figure GG.3 – Isosceles triangle arrow test gauge .
Figure GG.4 – Measurement of vibration amplitude .
Figure GG.53 – Relevant heights h , h and h for calculation of A and m . 136
inst 0 rel min max
Figure GG.64 – Airflow direction . 137
Figure KK.1 – Front view of test apparatus labels . 144
Figure KK.2 – Test apparatus with dimensions . 145
Figure KK.3 – Top view of test apparatus . 146
Figure LL.1 – Example of test chamber design . 155
Table 101 – Power spectral density profile for vibration test . 46
Table 101102 – UVC spectral irradiance measurement location . 65
Table AA.1 – Examples for operating temperatures of the appliance . 74
Table BB.1 – Selected information about refrigerants . 75
Table DD.1 – Mandatory clauses in each manual . 80
– 4 – IEC 60335-2-40:2022 CMV © IEC 2022
Table GG.1 – Outline of Annex GG (informative) . 97
Table GG.2 – Circulation airflow . 104
Table GG.3 – Appliance with packaging . 112
Table GG.4 – Appliance without packaging . 112
Table GG.5 – Minimum airflow air velocity . 128
Table GG.6 – Refrigerant leak rate (ṁ ) . 131
leak
Table LL.1 – Relationship among alarm set point, tolerance and test gas (informative) . 151
Table LL.2 – Gas and vapour concentrations . 153
Table LL.3 – Example of the test chamber design . 156
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
This commented version (CMV) of the official standard IEC 60335-2-40:2022 edition 7.0
allows the user to identify the changes made to the previous IEC 60335-2-40:2018 edition
6.0. Futhermore, comments from IEC SC 61D experts are provided to explain the reasons
of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.
– 6 – IEC 60335-2-40:2022 CMV © IEC 2022
IEC 60335 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 an International Standard.
This seventh edition cancels and replaces the sixth edition published in 2018. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– Clause 1 – added thermoelectric heat pumps to the scope and increased maximum rated
voltage to 300 V for single phase appliances;
– Clause 7 – revised requirements for marking on the appliance and packaging, including a
symbol for minimum floor area and modifying the symbol for flammable refrigerants to
include the safety group per ISO 817;
– Clause 11 and Clause 19 – restructured for alignment with Part 1 and added requirements
for supplementary air heaters;
– Clause 13 and Clause 16 – revised requirement for leakage current for stationary class I
motor-operated appliances;
– Clause 21 – added requirements for particle foam material and revised requirements for
transport testing;
– Clause 22 – removed limit on the sum of refrigerant charges for appliances with multiple
refrigerating systems, and revised requirements for avoiding ignition sources, leak
detection systems, safety shut-off valves, and particle foam material;
– Clause 23 – added requirements to avoid contact between wires and refrigerant piping;
– Clause 24 – revised requirements for motor-compressors;
– Clause 30 – added requirements for resistance to heat of particle foam material;
– Annex BB – revised Table BB.1 with refrigerant information and added a link to ISO 817
refrigerant data;
– Annex DD – revised requirements for information in the manual for appliances with
flammable refrigerants;
– Annex EE – revised requirements for pressure testing;
– Annex FF – revised requirements for leak simulation tests;
– Annex GG – added requirements for applying releasable charge, added additional
coverage for A2 and A3 refrigerants, including new charge limits for appliances with
circulation airflow and for enhanced tightness refrigerating systems, and revised
requirements for enhanced tightness refrigerating systems using A2L refrigerant;
– Annex LL – revised requirements for refrigerant detection systems;
– Annex MM – revised simulated leak rate;
– Annex OO – deleted annex for conditioning internal wiring using UV light.
– Annex PP – new coverage of leak detection system confirmation test;
– Annex QQ – new coverage of method for determining releasable charge.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/491/FDIS 61D/493/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 International Standard 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.
This part 2-40 is to be used in conjunction with IEC 60335-1:2010, its Amendment 1:2013 and
its Amendment 2:2016. 1
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This part 2-40 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electrical heat pumps,
air-conditioners and dehumidifiers.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
• subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
• unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
• additional annexes are lettered AA, BB, etc.
NOTE 3 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.
The following differences exist in the countries indicated below:
• 6.1: Class 0I appliances are allowed (Japan).
• 11.8: The temperature of the wooden walls in the test casing is limited to 85 °C (Sweden).
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
– 8 – IEC 60335-2-40:2022 CMV © IEC 2022
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the instructions. It also covers abnormal situations that can be expected
in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may can differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal and generic standards publications, basic safety publications and group safety publications
covering a hazard are not applicable since they have been taken into consideration when developing the general and
particular requirements for the IEC 60335 series of standards. For example, in the case of temperature requirements
for surfaces on many appliances, generic standards, such as ISO 13732-1 for hot surfaces, are not applicable in
addition to Part 1 or part 2 standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard 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 the
standard.
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric heat pumps, including sanitary hot
water heat pumps and air conditioners, incorporating motor-compressors as well as hydronic
fan coils units, dehumidifiers (with or without motor-compressors), thermoelectric heat
pumps 2 and partial units. Their maximum rated voltage being not more than 250 300 V for
single phase appliances and 600 V for all other multi-phase appliances. 3 Partial units are
within the scope of this International Standard.
Appliances not intended for normal household use but which nevertheless may can be a source
of danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
more factory-made assemblies. If
The appliances referenced above may can consist of one or
provided in more than one assembly, the separate assemblies are to be used together, and the
requirements are based on the use of matched assemblies.
NOTE 101 A definition of ‘motor-compressor’ is given in IEC 60335-2-34, which includes the statement that the
term motor-compressor is used to designate either a hermetic motor-compressor or semi-hermetic motor-compressor.
NOTE 102 Requirements for refrigerating safety are covered by ISO 5149-1, ISO 5149-2, and ISO 5149-3.
Requirements for containers intended for storage of the heated water included in sanitary hot water heat pumps
are, in addition, covered by IEC 60335-2-21.
This standard does not take into account refrigerants other than group A1, A2L, A2 and A3 as
defined by ISO 817 classification, A2L. Flammable refrigerants are limited to those of a molar
mass of more than or equal to 42 kg/kmol based on WCF (worst case formulation) as specified
in ISO 817.
This standard specifies particular requirements for the use of flammable refrigerants.
As far as practical, this standard deals with common hazards presented by appliances that are
encountered in normal use and assumes that installation, servicing, decommissioning, and
disposal are safely handled by competent persons and accidental release of refrigerants is
avoided. However, it does not prescribe the criteria to ensure competence of persons during
installation, servicing and disposal. Safety requirements during disposal are not specified in
this standard. 4
NOTE 103 Annex HH provides informative requirements on competence of persons. Criteria for competence of
personnel for the purpose of certification schemes can be found in ISO 22712 .
Unless specifications are covered by this standard, including the annexes, requirements for
refrigerating safety are covered by:
– ISO 5149-1:2014, ISO 5149-1:2014/AMD1:2015, and ISO 5149-1:2014/AMD2:2021,
___________
Under preparation. Stage at the time of publication: ISO FDIS 22712:2022
– 10 – IEC 60335-2-40:2022 CMV © IEC 2022
– ISO 5149-2:2014 and ISO 5149-2:2014/AMD1:2020,
– ISO 5149-3:2014 and ISO 5149-3:2014/AMD1:2021.
Supplementary heaters, or a provision for their separate installation, are within the scope of
this standard, but only heaters which are designed as a part of the appliance package, the
controls being incorporated in the appliance.
NOTE 103104 Attention is drawn to the fact that
• for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements may can be
necessary;
• for appliances subjected to pressure, additional requirements may be necessary;
• in many countries, additional requirements are specified, for example, by the national health authorities
responsible for the protection of labour and the national authorities responsible for storage, transportation,
building constructions and installations.
t apply to
NOTE 104105 This standard does no
• humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88);
• appliances designed exclusively for industrial processing;
• appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive
or explosive atmosphere (dust, vapour or gas).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-52, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium,
chloride solution)
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-7:2015, Explosive atmospheres − Part 7: Equipment protection by increased safety
"e"
IEC 60079-7:2015/AMD1:2017
IEC 60079-14:2013, Explosive atmospheres − Part 14: Electrical installations design, selection
and erection
IEC 60079-15:20102017, Explosive atmospheres – Part 15: Equipment protection by type of
protection "n"
IEC 60335-2-34:20122021, Household and similar electrical appliances – Safety – Part 2-34:
Particular requirements for motor-compressors
IEC 60335-2-51, Household and similar electrical appliances – Safety – Part 2-51: Particular
requirements for stationary circulation pumps for heating and service water installations
IEC 60695-1-10, Fire hazard testing – Part 1-10: Guidance for assessing the fire hazard of
electrotechnical products – General guidelines
IEC 60695-10-2:2014, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
method
IEC 60730-2-6, Automatic electrical controls – Part 2-6: Particular requirements for automatic
electrical pressure sensing controls including mechanical requirements
IEC 61032, Protection of persons and equipment by enclosures – Probes for verification
IEC 62471:2006, Photobiological safety of lamps and lamp systems
ISO 817, Refrigerants – Designation and safety classification
ISO 527-3, Plastics − Determination of tensile properties − Part 3: Test conditions for films and
sheets
ISO 1302:2002 , Geometrical Product Specifications (GPS) – Indication of surface texture in
technical product documentation
ISO 2578, Plastics – Determination of time-temperature limits after prolonged exposure to heat
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
lamps
ISO 4892-4, Plastics – Methods of exposure to laboratory light sources – Part 4: Open-flame
carbon-arc lamps
ISO 5149-1:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 1: Definitions, classification and selection criteria
ISO 5149-1:2014/AMD1:2015
ISO 5149-1:2014/AMD2:2021
ISO 5149-2:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 2: Design, construction, testing, marking and documentation
ISO 5149-2:2014/AMD1:2020
ISO 5149-3:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 3: Installation site
ISO 5149-3:2014/AMD1:2021
ISO 5151:2017, Non-ducted air conditioners and heat pumps – Testing and rating for
performance
ISO 5151:2017/AMD1:2020
symbols – Safety colours and safety signs – Registered safety
ISO 7010:20112019, Graphical
signs
ISO 13253, Ducted air-conditioners and air-to-air heat pumps – Testing and rating for
performance
ISO 13256 (all parts), Water-source heat pumps – Testing and rating for performance
ISO 13355:2016, Packaging − Complete, filled transport packages and unit loads − Vertical
random vibration test
ISO 14903, Refrigerating systems and heat pumps – Qualification of tightness of components
and joints
___________
Withdrawn.
– 12 – IEC 60335-2-40:2022 CMV © IEC 2022
ISO 15042, Multiple split-system air-conditioners and air-to-air heat pumps – Testing and rating
for performance
ASTM D4728-06:2012, Standard Test Method for Random Vibration Testing of Shipping
Containers
CAN/CSA-C22.2 No. 0.17, Evaluation of Properties of Polymeric Materials
UL 746A, Standard for Polymeric Materials – Short Term Property Evaluations
UL 746B, Standard for Polymeric Materials – Long Term Property Evaluations
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.4 Addition:
Note 101 to entry: If the appliance comprises electrical accessories, including fans, the rated power input is based
upon the total maximum electrical power input with all accessories energized, when operating continuously under
the appropriate environmental conditions. If the heat pump can be operated in the heating or cooling mode, the
rated power input is based upon the input in the heating or in the cooling mode, whichever is the greater.
3.1.9 Replacement:
normal operation
conditions that apply when the appliance is mounted or installed as in normal use and is
operating under the most severe operating conditions specified by the manufacturer
3.5.4 Addition:
Note 101 to entry: Appliances connected to water pipes or refrigerant pipes that are secured to the building are
also fixed appliances. 5
3.8.101
particle foam material
closed cell material moulded from thermoplastic particles (e.g. beads) with expanding agent 6
3.101
heat pump
appliance which takes up heat at a certain temperature and releases heat at a higher
temperature
Note 1 to entry: When operated to provide heat (e.g., for space heating or water heating), the appliance is said to
operate in the heating mode; when operated to remove heat (for example, for space cooling), it is said to operate in
the cooling mode.
Note 2 to entry: A heat pump can contain a combination of condensing unit or condenser unit and an
evaporating unit or evaporator unit and can be equipped to operate in a reverse cycle mode.
3.102
sanitary hot water heat pump
heat pump intended to transfer heat to water suitable for human consumption
3.103
air conditioner
encased assembly or assemblies designed as an appliance to provide delivery of conditioned
air to an enclosed space, room or zone
Note 1 to entry: It includes an electrically operated refrigerating system for cooling and possibly dehumidifying
the air.
Note 2 to entry: It may can have means for heating, circulating, cleaning and humidifying the air.
Note 3 to entry: An air conditioner can contain a combination of condensing unit or condenser unit and an
evaporating unit or evaporator unit.
3.104
dehumidifier
encased assembly designed to remove moisture from its surrounding atmosphere
Note 1 to entry: It includes an electrically operated refrigerating system and the means to circulate air. It also
includes a drain arrangement for collecting and storing and/or disposing of the condensate.
3.108
wet-bulb temperature
WB
temperature indicated when the temperature-sensitive element in a wetted wick has reached a
state of constant temperature (evaporative equilibrium)
3.109
dry-bulb temperature
DB
temperature indicated by a dry, temperature-sensitive element shielded from the effects of
radiation
3.110
evaporator
heat exchanger in which refrigerant liquid is vaporized by absorption of heat
3.111
heat exchanger
device specifically designed to transfer heat between two physically separated fluids (gas or
liquid)
3.112
indoor heat exchanger
heat exchanger designed to transfer heat to the indoor parts of the building or to the indoor
hot water supplies (e.g. sanitary water) or to remove heat therefrom
3.113
outdoor heat exchanger
heat exchanger designed to remove or release heat from the heat source (for example, ground
water, outdoor air, exhaust air, water or brine)
3.114 Supplementary heaters 7
3.114.1
supplementary heater
electric heater provided as part of the appliance to supplement or replace the output of the
refrigerant circuit of the appliance by operation in conjunction with, or instead of, the
refrigerating circuit that supplements or replaces the output of the refrigerant circuit for the
purpose of heating air or water
3.114.2
supplementary water heater
supplementary heater specifically for the purpose of heating water
– 14 – IEC 60335-2-40:2022 CMV © IEC 2022
3.114.3
supplementary air heater
supplementary heater specifically for the purpose of heating air in conjunction with, or instead
of, the refrigerating circuit
Note 1 to entry: Supplementary air heaters include electric heaters provided as part of an appliance with cooling-
only refrigerant circuits.
3.115
pressure-limiting device
mechanism that automatically responds to a predetermined pressure by stopping the operation
of the pressure-imposing element
3.116
pressure-relief device
pressure actuated valve or rupture member which functions to relieve excessive pressure
automatically
3.117
appliances accessible to the general public
appliances intended to be located in residential buildings or in commercial buildings in a location
without restricted access
3.118
appliances not accessible to the general public
appliances which are located either in a secured location with restricted access (e.g. machine
rooms, rooftop and the like, or at a level not less than above 2,5 m or in secured rooftop areas)
3.119
hydronic fan coil unit
factory-made assembly which provides the function of forced circulation of air for heating and/or
cooling, which may also include the function of dehumidification and/or filtering of air, but
which does not include the source of cooling or heating
Note 1 to entry: Hydronic fan coil units can include provision for electric resistance heating. Heat exchanger coils
are intended for hydronic heating and cooling only.
3.120
flammable refrigerant
refrigerant classified as class safety group A2L, A2 or A3 according to ISO 817
3.121
refrigerating system
combination of interconnected refrigerant containing parts constituting one closed refrigerant
circuit in which refrigerant is circulated for the purpose of extracting heat at the low temperature
side to reject heat at the high temperature side by changing the state of the refrigerant
3.122
maximum allowable pressure
rally the maximum pressure for which
limit to the refrigerating system operating pressure, gene
the equipment is designed, as specified by the manufacturer 8
Note 1 to entry: Maximum allowable pressure constitutes a limit to the operating pressure of a refrigerating
system, hydronic circuit or sanitary hot water tank whether the equipment is working or not, see Clause 21.
3.123
low-pressure side
part(s) of a refrigerating system operating at the evaporator pressure
3.124
high-pressure side
part(s) of a refrigerating system operating at the condenser pressure
3.125
service port
means to access the refrigerant in a refrigerating system for the purpose of charging or
servicing the system, typically a valve, tube extension or entry location
3.126
factory sealed single package unit
factory assembly of components of refrigerating system fixed on a common mounting to form
a discrete unit in which all refrigerating system parts have been sealed tight by welding,
brazing or a similar permanent connection during the manufacturing process
3.127
pre-charged pipe sets
interconnecting refrigerant lines which are supplied with the unit and supplied with a refrigerant
charge for the purpose of completing the refrigerating system in the field for appliances that
are made up of more than one subassembly and are assembled in the field to complete the
refrigerating system
3.128
condenser
heat exchanger in which refrigerant vapour is condensed by removal of heat
3.129
condensing unit
factory-made assembly that includes one or more motor-compressors, condenser in cooling
mode and motor-driven fan, blower or pump to circulate the heat transfer fluid through the
condenser with associated operational controls in addition to the necessary wiring
Note 1 to entry: These units are intended for field connection to an evaporator unit. A condensing unit can also
be equipped to operate in the reverse cycle mode. A condensing unit can include expansion device(s).
3.130
condenser unit
factory-made assembly that includes one or more condensers in cooling mode and motor-
driven fan, blower or pump to circulate the heat transfer fluid through the condenser with
associated operational controls in addition to the necessary wiring
Note 1 to entry: These units are intended for field connection to an evaporating unit. A condenser unit can also
be equipped to operate in the reverse cycle mode.
Note 2 to entry: A condenser unit does not include a motor compressor or expansion device.
3.131
ev
...
IEC 60335-2-40 ®
Edition 7.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-40: Exigences particulières pour les pompes à chaleur électriques, les
climatiseurs et les déshumidificateurs
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IEC 60335-2-40 ®
Edition 7.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-40: Exigences particulières pour les pompes à chaleur électriques, les
climatiseurs et les déshumidificateurs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 23.120 ISBN 978-2-8322-3437-2
– 2 – IEC 60335-2-40:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 11
4 General requirement . 19
5 General conditions for the tests . 19
6 Classification . 20
7 Marking and instructions . 20
8 Protection against access to live parts . 26
9 Starting of motor-operated appliances . 26
10 Power input and current . 26
11 Heating . 26
12 Void . 29
13 Leakage current and electric strength at operating temperature . 29
14 Transient overvoltages . 29
15 Moisture resistance . 29
16 Leakage current and electric strength . 31
17 Overload protection of transformers and associated circuits . 31
18 Endurance . 31
19 Abnormal operation . 31
20 Stability and mechanical hazards . 38
21 Mechanical strength . 38
22 Construction . 39
23 Internal wiring . 51
24 Components . 51
25 Supply connection and external flexible cords . 52
26 Terminals for external conductors . 53
27 Provision for earthing . 53
28 Screws and connections . 53
29 Clearances, creepage distances and solid insulation . 53
30 Resistance to heat and fire . 53
31 Resistance to rusting . 55
32 Radiation, toxicity and similar hazards . 55
Annexes . 62
Annex D (normative) Thermal motor protectors . 62
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 62
Annex AA (informative) Examples for operating temperatures of the appliance . 63
Annex BB (normative) Selected information about refrigerants . 64
Annex CC (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 68
Annex DD (normative) Requirements for installation, service, maintenance and repair,
and decommissioning manuals of appliances using flammable refrigerants . 69
Annex EE (normative) Pressure tests . 78
Annex FF (normative) Leak simulation tests . 80
Annex GG (normative) Charge limits, ventilation requirements and requirements for
secondary circuits . 82
Annex HH (informative) Competence of service personnel . 115
Annex II (Void) . 117
Annex JJ (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 118
Annex KK (normative) Test method for hot surface ignition temperature for A2L . 120
Annex LL (normative) Refrigerant detection systems for flammable refrigerants . 124
Annex MM (normative) Refrigerant sensor location confirmation test . 135
Annex NN (normative) Flame arrest enclosure verification test for A2L refrigerants . 138
Annex OO (Void) . 140
Annex PP (normative) Leak detection system confirmation test for flammable
refrigerants . 141
Annex QQ (normative) Methods for determining releasable charge . 147
Bibliography . 155
Figure 101 – Example of label for field charged units . 57
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 59
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type –
Revise as needed for three-phase test . 60
Figure 104 – Power spectral density profile for vibration test in 21.101 . 60
Figure 105 – Dimensional details for the weight in the area of the pressure ball . 60
Figure 106 – Measurement before and after the test . 61
Figure GG.1 – Unventilated area. 112
Figure GG.2 – Mechanical ventilation . 112
Figure GG.3 – Relevant heights h , h and h for calculation of A and m . 113
inst 0 rel min max
Figure GG.4 – Airflow direction . 114
Figure KK.1 – Front view of test apparatus labels . 120
Figure KK.2 – Test apparatus with dimensions . 121
Figure KK.3 – Top view of test apparatus . 122
Figure LL.1 – Example of test chamber design . 130
Table 101 – Power spectral density profile for vibration test . 38
Table 102 – UVC spectral irradiance measurement location . 56
Table AA.1 – Examples for operating temperatures of the appliance . 63
Table BB.1 – Selected information about refrigerants. 64
Table DD.1 – Mandatory clauses in each manual . 69
Table GG.1 – Outline of Annex GG (informative). 83
Table GG.2 – Circulation airflow . 88
Table GG.3 – Appliance with packaging . 95
– 4 – IEC 60335-2-40:2022 © IEC 2022
Table GG.4 – Appliance without packaging . 95
Table GG.5 – Minimum air velocity . 107
Table GG.6 – Refrigerant leak rate (ṁ ) . 110
leak
Table LL.1 – Relationship among alarm set point, tolerance and test gas (informative) . 126
Table LL.2 – Gas and vapour concentrations . 128
Table LL.3 – Example of the test chamber design . 131
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
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,
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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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60335 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 an International Standard.
This seventh edition cancels and replaces the sixth edition published in 2018. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– Clause 1 – added thermoelectric heat pumps to the scope and increased maximum rated
voltage to 300 V for single phase appliances;
– Clause 7 – revised requirements for marking on the appliance and packaging, including a
symbol for minimum floor area and modifying the symbol for flammable refrigerants to
include the safety group per ISO 817;
– Clause 11 and Clause 19 – restructured for alignment with Part 1 and added requirements
for supplementary air heaters;
– 6 – IEC 60335-2-40:2022 © IEC 2022
– Clause 13 and Clause 16 – revised requirement for leakage current for stationary class I
motor-operated appliances;
– Clause 21 – added requirements for particle foam material and revised requirements for
transport testing;
– Clause 22 – removed limit on the sum of refrigerant charges for appliances with multiple
refrigerating systems, and revised requirements for avoiding ignition sources, leak
detection systems, safety shut-off valves, and particle foam material;
– Clause 23 – added requirements to avoid contact between wires and refrigerant piping;
– Clause 24 – revised requirements for motor-compressors;
– Clause 30 – added requirements for resistance to heat of particle foam material;
– Annex BB – revised Table BB.1 with refrigerant information and added a link to ISO 817
refrigerant data;
– Annex DD – revised requirements for information in the manual for appliances with
flammable refrigerants;
– Annex EE – revised requirements for pressure testing;
– Annex FF – revised requirements for leak simulation tests;
– Annex GG – added requirements for applying releasable charge, added additional
coverage for A2 and A3 refrigerants, including new charge limits for appliances with
circulation airflow and for enhanced tightness refrigerating systems, and revised
requirements for enhanced tightness refrigerating systems using A2L refrigerant;
– Annex LL – revised requirements for refrigerant detection systems;
– Annex MM – revised simulated leak rate;
– Annex OO – deleted annex for conditioning internal wiring using UV light.
– Annex PP – new coverage of leak detection system confirmation test;
– Annex QQ – new coverage of method for determining releasable charge.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/491/FDIS 61D/493/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 International Standard 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.
This part 2-40 is to be used in conjunction with IEC 60335-1:2010, its Amendment 1:2013 and
its Amendment 2:2016.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This part 2-40 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert that publication into the IEC standard: Safety requirements for electrical heat pumps,
air-conditioners and dehumidifiers.
When a particular subclause of Part 1 is not mentioned in this part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
• subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
• unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
• additional annexes are lettered AA, BB, etc.
NOTE 3 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.
The following differences exist in the countries indicated below:
• 6.1: Class 0I appliances are allowed (Japan).
• 11.8: The temperature of the wooden walls in the test casing is limited to 85 °C (Sweden).
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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
– 8 – IEC 60335-2-40:2022 © IEC 2022
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the instructions. It also covers abnormal situations that can be expected
in practice.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules can differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another part 2 of IEC 60335, the relevant part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a part 2 standard does not include additional requirements to cover hazards dealt with in
Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard 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 the
standard.
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 2-40: Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers
1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electric heat pumps, sanitary hot water heat
pumps and air conditioners, incorporating motor-compressors as well as hydronic fan coils
units, dehumidifiers (with or without motor-compressors), thermoelectric heat pumps and
partial units. Their maximum rated voltage being not more than 300 V for single phase
appliances and 600 V for multi-phase appliances.
Appliances not intended for normal household use but which nevertheless can be a source of
danger to the public, such as appliances intended to be used by laymen in shops, in light
industry and on farms, are within the scope of this standard.
The appliances referenced above can consist of one or more factory-made assemblies. If
provided in more than one assembly, the separate assemblies are used together, and the
requirements are based on the use of matched assemblies.
NOTE 101 A definition of ‘motor-compressor’ is given in IEC 60335-2-34, which includes the statement that the
term motor-compressor is used to designate either a hermetic motor-compressor or semi-hermetic motor-compressor.
NOTE 102 Requirements for containers intended for storage of the heated water included in sanitary hot water
heat pumps are, in addition, covered by IEC 60335-2-21.
This standard does not take into account refrigerants other than group A1, A2L, A2 and A3 as
defined by ISO 817. Flammable refrigerants are limited to those of a molar mass of more than
or equal to 42 kg/kmol based on WCF (worst case formulation) as specified in ISO 817.
As far as practical, this standard deals with common hazards presented by appliances that are
encountered in normal use and assumes that installation, servicing, decommissioning, and
disposal are safely handled by competent persons and accidental release of refrigerants is
avoided. However, it does not prescribe the criteria to ensure competence of persons during
installation, servicing and disposal. Safety requirements during disposal are not specified in
this standard.
NOTE 103 Annex HH provides informative requirements on competence of persons. Criteria for competence of
personnel for the purpose of certification schemes can be found in ISO 22712 .
Unless specifications are covered by this standard, including the annexes, requirements for
refrigerating safety are covered by:
– ISO 5149-1:2014, ISO 5149-1:2014/AMD1:2015, and ISO 5149-1:2014/AMD2:2021,
– ISO 5149-2:2014 and ISO 5149-2:2014/AMD1:2020,
– ISO 5149-3:2014 and ISO 5149-3:2014/AMD1:2021.
___________
Under preparation. Stage at the time of publication: ISO FDIS 22712:2022
– 10 – IEC 60335-2-40:2022 © IEC 2022
Supplementary heaters, or a provision for their separate installation, are within the scope of
this standard, but only heaters which are designed as a part of the appliance package, the
controls being incorporated in the appliance.
NOTE 104 Attention is drawn to the fact that
• for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be
necessary;
• in many countries, additional requirements are specified, for example, by the national health authorities
responsible for the protection of labour and the national authorities responsible for storage, transportation,
building constructions and installations.
NOTE 105 This standard does not apply to
• humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88);
• appliances designed exclusively for industrial processing;
• appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive
or explosive atmosphere (dust, vapour or gas).
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-52, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium,
chloride solution)
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-7:2015, Explosive atmospheres − Part 7: Equipment protection by increased safety
"e"
IEC 60079-7:2015/AMD1:2017
IEC 60079-14:2013, Explosive atmospheres − Part 14: Electrical installations design, selection
and erection
IEC 60079-15:2017, Explosive atmospheres – Part 15: Equipment protection by type of
protection "n"
IEC 60335-2-34:2021, Household and similar electrical appliances – Safety – Part 2-34:
Particular requirements for motor-compressors
IEC 60335-2-51, Household and similar electrical appliances – Safety – Part 2-51: Particular
requirements for stationary circulation pumps for heating and service water installations
IEC 60695-1-10, Fire hazard testing – Part 1-10: Guidance for assessing the fire hazard of
electrotechnical products – General guidelines
IEC 60695-10-2:2014, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test
method
IEC 60730-2-6, Automatic electrical controls – Part 2-6: Particular requirements for automatic
electrical pressure sensing controls including mechanical requirements
IEC 62471:2006, Photobiological safety of lamps and lamp systems
ISO 817, Refrigerants – Designation and safety classification
ISO 527-3, Plastics − Determination of tensile properties − Part 3: Test conditions for films and
sheets
ISO 1302:2002 , Geometrical Product Specifications (GPS) – Indication of surface texture in
technical product documentation
ISO 2578, Plastics – Determination of time-temperature limits after prolonged exposure to heat
ISO 5149-1:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 1: Definitions, classification and selection criteria
ISO 5149-1:2014/AMD1:2015
ISO 5149-1:2014/AMD2:2021
ISO 5149-2:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 2: Design, construction, testing, marking and documentation
ISO 5149-2:2014/AMD1:2020
ISO 5149-3:2014, Refrigerating systems and heat pumps – Safety and environmental
requirements – Part 3: Installation site
ISO 5149-3:2014/AMD1:2021
ISO 5151:2017, Non-ducted air conditioners and heat pumps – Testing and rating for
performance
ISO 5151:2017/AMD1:2020
ISO 7010:2019, Graphical symbols – Safety colours and safety signs – Registered safety signs
ISO 13253, Ducted air-conditioners and air-to-air heat pumps – Testing and rating for
performance
ISO 13256 (all parts), Water-source heat pumps – Testing and rating for performance
ISO 13355:2016, Packaging − Complete, filled transport packages and unit loads − Vertical
random vibration test
ISO 14903, Refrigerating systems and heat pumps – Qualification of tightness of components
and joints
ISO 15042, Multiple split-system air-conditioners and air-to-air heat pumps – Testing and rating
for performance
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1.4 Addition:
Note 101 to entry: If the appliance comprises electrical accessories, including fans, the rated power input is based
upon the total maximum electrical power input with all accessories energized, when operating continuously under
the appropriate environmental conditions. If the heat pump can be operated in the heating or cooling mode, the
rated power input is based upon the input in the heating or in the cooling mode, whichever is the greater.
___________
Withdrawn.
– 12 – IEC 60335-2-40:2022 © IEC 2022
3.1.9 Replacement:
normal operation
conditions that apply when the appliance is mounted or installed as in normal use and is
operating under the most severe operating conditions specified by the manufacturer
3.5.4 Addition:
Note 101 to entry: Appliances connected to water pipes or refrigerant pipes that are secured to the building are
also fixed appliances.
3.8.101
particle foam material
closed cell material moulded from thermoplastic particles (e.g. beads) with expanding agent
3.101
heat pump
appliance which takes up heat at a certain temperature and releases heat at a higher
temperature
Note 1 to entry: When operated to provide heat (e.g., for space heating or water heating), the appliance is said to
operate in the heating mode; when operated to remove heat (for example, for space cooling), it is said to operate in
the cooling mode.
Note 2 to entry: A heat pump can contain a combination of condensing unit or condenser unit and an
evaporating unit or evaporator unit and can be equipped to operate in a reverse cycle mode.
3.102
sanitary hot water heat pump
heat pump intended to transfer heat to water suitable for human consumption
3.103
air conditioner
encased assembly or assemblies designed as an appliance to provide delivery of conditioned
air to an enclosed space, room or zone
Note 1 to entry: It includes an electrically operated refrigerating system for cooling and possibly dehumidifying
the air.
Note 2 to entry: It can have means for heating, circulating, cleaning and humidifying the air.
Note 3 to entry: An air conditioner can contain a combination of condensing unit or condenser unit and an
evaporating unit or evaporator unit.
3.104
dehumidifier
encased assembly designed to remove moisture from its surrounding atmosphere
Note 1 to entry: It includes an electrically operated refrigerating system and the means to circulate air. It also
includes a drain arrangement for collecting and storing and/or disposing of the condensate.
3.108
wet-bulb temperature
WB
temperature indicated when the temperature-sensitive element in a wetted wick has reached a
state of constant temperature (evaporative equilibrium)
3.109
dry-bulb temperature
DB
temperature indicated by a dry, temperature-sensitive element shielded from the effects of
radiation
3.110
evaporator
heat exchanger in which refrigerant liquid is vaporized by absorption of heat
3.111
heat exchanger
device specifically designed to transfer heat between two physically separated fluids (gas or
liquid)
3.112
indoor heat exchanger
heat exchanger designed to transfer heat to the indoor parts of the building or to the indoor
hot water supplies (e.g. sanitary water) or to remove heat therefrom
3.113
outdoor heat exchanger
heat exchanger designed to remove or release heat from the heat source (for example, ground
water, outdoor air, exhaust air, water or brine)
3.114 Supplementary heaters
3.114.1
supplementary heater
electric heater that supplements or replaces the output of the refrigerant circuit for the purpose
of heating air or water
3.114.2
supplementary water heater
supplementary heater specifically for the purpose of heating water
3.114.3
supplementary air heater
supplementary heater specifically for the purpose of heating air in conjunction with, or instead
of, the refrigerating circuit
Note 1 to entry: Supplementary air heaters include electric heaters provided as part of an appliance with cooling-
only refrigerant circuits.
3.115
pressure-limiting device
mechanism that automatically responds to a predetermined pressure by stopping the operation
of the pressure-imposing element
3.116
pressure-relief device
pressure actuated valve or rupture member which functions to relieve excessive pressure
automatically
3.117
appliances accessible to the general public
appliances intended to be located in residential buildings or in commercial buildings in a location
without restricted access
3.118
appliances not accessible to the general public
appliances which are located in a secured location with restricted access (e.g. machine rooms,
rooftop and the like, or at a level above 2,5 m)
– 14 – IEC 60335-2-40:2022 © IEC 2022
3.119
hydronic fan coil unit
factory-made assembly which provides the function of forced circulation of air for heating and/or
cooling, which may also include the function of dehumidification and/or filtering of air, but
which does not include the source of cooling or heating
Note 1 to entry: Hydronic fan coil units can include provision for electric resistance heating. Heat exchanger coils
are intended for hydronic heating and cooling only.
3.120
flammable refrigerant
refrigerant classified as safety group A2L, A2 or A3 according to ISO 817
3.121
refrigerating system
combination of interconnected refrigerant containing parts constituting one closed refrigerant
circuit in which refrigerant is circulated for the purpose of extracting heat at the low temperature
side to reject heat at the high temperature side by changing the state of the refrigerant
3.122
maximum allowable pressure
the maximum pressure for which the equipment is designed, as specified by the manufacturer
Note 1 to entry: Maximum allowable pressure constitutes a limit to the operating pressure of a refrigerating
system, hydronic circuit or sanitary hot water tank whether the equipment is working or not, see Clause 21.
3.123
low-pressure side
part(s) of a refrigerating system operating at the evaporator pressure
3.124
high-pressure side
part(s) of a refrigerating system operating at the condenser pressure
3.125
service port
means to access the refrigerant in a refrigerating system for the purpose of charging or
servicing the system, typically a valve, tube extension or entry location
3.126
factory sealed single package unit
factory assembly of components of refrigerating system fixed on a common mounting to form
a discrete unit in which all refrigerating system parts have been sealed tight by welding,
brazing or a similar permanent connection during the manufacturing process
3.127
pre-charged pipe sets
interconnecting refrigerant lines which are supplied with the unit and supplied with a refrigerant
charge for the purpose of completing the refrigerating system in the field for appliances that
are made up of more than one subassembly and are assembled in the field to complete the
refrigerating system
3.128
condenser
heat exchanger in which refrigerant vapour is condensed by removal of heat
3.129
condensing unit
factory-made assembly that includes one or more motor-compressors, condenser in cooling
mode and motor-driven fan, blower or pump to circulate the heat transfer fluid through the
condenser with associated operational controls in addition to the necessary wiring
Note 1 to entry: These units are intended for field connection to an evaporator unit. A condensing unit can also
be equipped to operate in the reverse cycle mode. A condensing unit can include expansion device(s).
3.130
condenser unit
factory-made assembly that includes one or more condensers in cooling mode and motor-
driven fan, blower or pump to circulate the heat transfer fluid through the condenser with
associated operational controls in addition to the necessary wiring
Note 1 to entry: These units are intended for field
...
Frequently Asked Questions
IEC 60335-2-40:2022 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers". This standard covers: IEC 60335-2-40:2022 deals with the safety of electric heat pumps, sanitary hot water heat pumps and air conditioners, incorporating motor-compressors as well as hydronic fan coils units, dehumidifiers (with or without motor-compressors), thermoelectric heat pumps and partial units. Their maximum rated voltage being not more than 300 V for single phase appliances and 600 V for multi-phase appliances. Appliances not intended for normal household use but which nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. The appliances referenced above can consist of one or more factory-made assemblies. If provided in more than one assembly, the separate assemblies are used together, and the requirements are based on the use of matched assemblies. This document does not take into account refrigerants other than group A1, A2L, A2 and A3 as defined by ISO 817. Flammable refrigerants are limited to those of a molar mass of more than or equal to 42 kg/kmol based on WCF (worst case formulation) as specified in ISO 817. As far as practical, this document deals with common hazards presented by appliances that are encountered in normal use and assumes that installation, servicing, decommissioning, and disposal are safely handled by competent persons and accidental release of refrigerants is avoided. However, it does not prescribe the criteria to ensure competence of persons during installation, servicing and disposal. Safety requirements during disposal are not specified in this standard. Supplementary heaters, or a provision for their separate installation, are within the scope of this standard, but only heaters which are designed as a part of the appliance package, the controls being incorporated in the appliance. Attention is drawn to the fact that - for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be necessary; - in many countries, additional requirements are specified, for example, by the national health authorities responsible for the protection of labour and the national authorities responsible for storage, transportation, building constructions and installations. This document does not apply to - humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88); - appliances designed exclusively for industrial processing; - appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas). This seventh edition cancels and replaces the sixth edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - Clause 1: added thermoelectric heat pumps to the scope and increased maximum rated voltage to 300 V for single phase appliances; - Clause 7: revised requirements for marking on the appliance and packaging, including a symbol for minimum floor area and modifying the symbol for flammable refrigerants to include the safety group per ISO 817; - Clause 11 and Clause 19: restructured for alignment with Part 1 and added requirements for supplementary air heaters; - Clause 13 and Clause 16: revised requirement for leakage current for stationary class I motor-operated appliances; - Clause 21: added requirements for particle foam material and revised requirements for transport testing; - Clause 22: removed limit on the sum of refrigerant charges for appliances with multiple refrigerating systems, and revised requirements for avoiding ignition sources, leak detection systems, safety shut-off valves, and particle foam material; - Clause 23: added requirements to avoid contact between wires and refrigerant piping; - Clause 24 The content of the corrigendum 1 (2024-10) has been included in this copy.
IEC 60335-2-40:2022 deals with the safety of electric heat pumps, sanitary hot water heat pumps and air conditioners, incorporating motor-compressors as well as hydronic fan coils units, dehumidifiers (with or without motor-compressors), thermoelectric heat pumps and partial units. Their maximum rated voltage being not more than 300 V for single phase appliances and 600 V for multi-phase appliances. Appliances not intended for normal household use but which nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. The appliances referenced above can consist of one or more factory-made assemblies. If provided in more than one assembly, the separate assemblies are used together, and the requirements are based on the use of matched assemblies. This document does not take into account refrigerants other than group A1, A2L, A2 and A3 as defined by ISO 817. Flammable refrigerants are limited to those of a molar mass of more than or equal to 42 kg/kmol based on WCF (worst case formulation) as specified in ISO 817. As far as practical, this document deals with common hazards presented by appliances that are encountered in normal use and assumes that installation, servicing, decommissioning, and disposal are safely handled by competent persons and accidental release of refrigerants is avoided. However, it does not prescribe the criteria to ensure competence of persons during installation, servicing and disposal. Safety requirements during disposal are not specified in this standard. Supplementary heaters, or a provision for their separate installation, are within the scope of this standard, but only heaters which are designed as a part of the appliance package, the controls being incorporated in the appliance. Attention is drawn to the fact that - for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be necessary; - in many countries, additional requirements are specified, for example, by the national health authorities responsible for the protection of labour and the national authorities responsible for storage, transportation, building constructions and installations. This document does not apply to - humidifiers intended for use with heating and cooling equipment (IEC 60335-2-88); - appliances designed exclusively for industrial processing; - appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas). This seventh edition cancels and replaces the sixth edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - Clause 1: added thermoelectric heat pumps to the scope and increased maximum rated voltage to 300 V for single phase appliances; - Clause 7: revised requirements for marking on the appliance and packaging, including a symbol for minimum floor area and modifying the symbol for flammable refrigerants to include the safety group per ISO 817; - Clause 11 and Clause 19: restructured for alignment with Part 1 and added requirements for supplementary air heaters; - Clause 13 and Clause 16: revised requirement for leakage current for stationary class I motor-operated appliances; - Clause 21: added requirements for particle foam material and revised requirements for transport testing; - Clause 22: removed limit on the sum of refrigerant charges for appliances with multiple refrigerating systems, and revised requirements for avoiding ignition sources, leak detection systems, safety shut-off valves, and particle foam material; - Clause 23: added requirements to avoid contact between wires and refrigerant piping; - Clause 24 The content of the corrigendum 1 (2024-10) has been included in this copy.
IEC 60335-2-40:2022 is classified under the following ICS (International Classification for Standards) categories: 23.120 - Ventilators. Fans. Air-conditioners. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60335-2-40:2022 has the following relationships with other standards: It is inter standard links to IEC 60335-2-40:2022/COR1:2024, IEC 60335-2-40:2024, IEC 60335-2-40:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 60335-2-40:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
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