IEC 60335-2-40:2024

IEC 60335-2-40 ®
Edition 8.0 2024-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60335-2-40:2024 includes the content of the references made to
IEC 60335-1:2020
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 8.0 2024-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This full version of IEC 60335-2-40:2024 includes the content of the references made to
IEC 60335-1:2020
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 978-2-8327-0103-4

IEC 60335-1:2020/ISH1:2021 – 1 –
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0  2020-09
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –

Part 1: General requirements
INTERPRETATION 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:
Draft Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
___________
INTRODUCTION
Edition 6 of IEC 60335-1:2020 defines and introduces requirements for a detachable
power supply part of an appliance. In the document, 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 the term
"power supply" as used in Subclause 24.2.
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.
ICS 13.120; 97.030
IEC 60335-1:2020-09/ISH1:2021-11(en)

– 2 – IEC 60335-2-40:2024 EXV © IEC 2024

CONTENTS
FOREWORD . 7
INTRODUCTION to IEC 60335-1:2020 . 10
INTRODUCTION to IEC 60335-2-40:2024 . 12
1 Scope . 13
2 Normative references . 14
3 Terms and definitions . 20
4 General requirement . 38
5 General conditions for the tests . 38
6 Classification . 43
7 Marking and instructions . 44
8 Protection against access to live parts . 57
9 Starting of motor-operated appliances . 59
10 Power input and current . 59
11 Heating . 62
12 Charging of metal-ion batteries . 69
13 Leakage current and electric strength at operating temperature . 70
14 Transient overvoltages . 73
15 Moisture resistance . 74
16 Leakage current and electric strength . 75
17 Overload protection of transformers and associated circuits . 77
18 Endurance . 78
19 Abnormal operation . 78
20 Stability and mechanical hazards . 94
21 Mechanical strength . 95
22 Construction . 98
23 Internal wiring . 122
24 Components . 124
25 Supply connection and external flexible cords . 130
26 Terminals for external conductors . 138
27 Provision for earthing . 141
28 Screws and connections . 143
29 Clearances, creepage distances and solid insulation . 145
30 Resistance to heat and fire . 154
31 Resistance to rusting . 158
32 Radiation, toxicity and similar hazards . 159
Annex A (informative) Routine tests . 178
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 180
Annex C (normative) Ageing test on motors . 201
Annex D (normative) Thermal motor protectors . 202
Annex E (normative) Needle-flame test . 203
Annex F (normative) Capacitors . 204

Annex G (normative) Safety isolating transformers . 206
Annex H (normative) Switches . 207
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 209
Annex J (normative) Coated printed circuit boards . 210
Annex K (informative) Overvoltage categories . 211
Annex L (informative) Guidance for the measurement of clearances and creepage

distances . 212
Annex M (informative) Pollution degree . 215
Annex N (normative) Proof tracking test . 216
Annex O (informative) Selection and sequence of the tests of Clause 30 . 217
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 222
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 224
Annex R (normative) Software evaluation . 227
Annex S (informative) Guidance for the application of this standard on measurement
of power input and current based on the requirements of 10.1 and 10.2 concerning the

representative period . 241
Annex T (normative) UV-C radiation effect on non-metallic materials . 242
Annex U (normative) Appliances intended for remote communication through public
networks . 245
Annex V (informative) Examples for operating temperatures of the appliance . 249
Annex W (normative) Selected information about refrigerants . 250
Annex X (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 254
Annex Y (normative) Requirements for installation, service, maintenance and repair,
and decommissioning instructions of appliances using flammable refrigerants . 255
Annex Z (normative) Pressure tests . 264
Annex AA (normative) Leak simulation tests . 266
Annex BB (normative) Charge limits, ventilation requirements and requirements for
secondary circuits . 268
Annex CC (informative) Competence of service personnel . 302
Annex DD (Void) . 305
Annex EE (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 306
Annex FF (normative) Test method for hot surface ignition temperature for A2L . 308
Annex GG (Void) . 312
Annex HH (normative) Refrigerant sensor location confirmation test . 313
Annex II (normative) Flame arrest enclosure verification test for A2L refrigerants . 316
Annex JJ (Void) . 318
Annex KK (normative) Leak detection system confirmation test for flammable
refrigerants . 319
Annex LL (normative) Methods for determining releasable charge . 325
Bibliography . 333
Index of defined terms . 336
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 . 161

– 4 – IEC 60335-2-40:2024 EXV © IEC 2024

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 . 162
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 . 163
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 . 164
Figure 5 – Small part . 165
Figure 6 – Example of an electronic circuit with low-power points . 165
Figure 7 – Test finger nail . 166
Figure 8 – Flexing test apparatus . 167
Figure 9 – Constructions of cord anchorages . 168
Figure 10 – An example of parts of an earthing terminal . 169
Figure 11 – Examples of clearances . 170
Figure 12 – Example of the placement of the cylinder . 171
Figure 13 – Small parts cylinder . 172
Figure 14 – Example of a specified operating region of a lithium-ion cell during
charging . 173
Figure 101 – Example of label for field charged units . 173
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 175
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type . 176
Figure 104 – Power spectral density profile for vibration test in 21.101 . 176
Figure 105 – Dimensional details for the weight in the area of the pressure ball. 176
Figure 106 – Measurement before and after the test . 177
Figure B.1 – Examples of battery-operated appliance constructions and application of
normative Annex B (1 of 2) . 198
Figure B.2 – Examples of correct polarity connection marking representing three
batteries . 200
Figure L.1 – Sequence for the determination of clearances . 212
Figure L.2 – Sequence for the determination of creepage distances . 213
Figure L.3 – Measurement of clearances . 214
Figure O.1 – Tests for resistance to heat . 217
Figure O.2 – Selection and sequence of tests for resistance to fire in hand-held
appliances . 218
Figure O.3 – Selection and sequence of tests for resistance to fire in attended
appliances . 218
Figure O.4 – Selection and sequence of tests for resistance to fire in unattended
appliances . 219
Figure O.5 – Some applications of the term "within a distance of 3 mm" . 221
Figure Q.1 – Flowchart outlining the sequence of tests for the evaluation of electronic
circuits (1 of 2) . 225
Figure S.1 – Flowchart giving guidance on measurement of power input and current
concerning the representative period . 241
Figure GG.1 – Unventilated area . 299
Figure GG.2 – Mechanical ventilation . 299
Figure GG.3 – Relevant heights h , h and h for calculation of A and m . 300
inst 0 rel min max
Figure GG.4 – Airflow direction . 301
Figure KK.1 – Front view of test apparatus labels . 308
Figure KK.2 – Test apparatus with dimensions . 309
Figure KK.3 – Top view of test apparatus . 310

Table 1 – Power input deviation . 60
Table 2 – Current deviation . 61
Table 3 – Maximum normal temperature rises . 66
Table 4 – Voltage for electric strength test . 73
Table 5 – Characteristics of high-voltage sources . 73
Table 6 – Impulse test voltage . 74
Table 7 – Test voltages. 77
Table 8 – Maximum winding temperature . 81
Table 9 – Maximum abnormal temperature rise . 87
Table 101 – Power spectral density profile for vibration test . 97
Table 10 – Dimensions of cables and conduits . 131
Table 11 – Minimum cross-sectional area of conductors . 133
Table 12 – Pull force and torque . 136
Table 13 – Nominal cross-sectional area of conductors . 140
Table 14 – Torque for testing screws and nuts . 144
Table 15 – Rated impulse voltage . 146
Table 16 – Minimum clearances . 146
Table 17 – Minimum creepage distances for basic insulation . 150
Table 18 – Minimum creepage distances for functional insulation . 152
Table 19 – Minimum thickness for accessible parts of reinforced insulation consisting
of a single layer . 153
Table 102 – UV-C spectral irradiance measurement location . 160
Table A.1 – Test voltages . 179
Table B.1 – Artificial source characteristics . 182
Table B.2 – Total area of openings for metal-ion cells . 190
Table B.3 – Volume of air injected at 2 070 kPa . 190
Table C.1 – Test conditions . 201
Table R.1 – General fault/error conditions . 229
Table R.2 – Specific fault/error conditions . 231
Table R.3 – Semi-formal methods . 237
Table R.4 – Software architecture specification . 237
Table R.5 – Module design specification . 238
Table R.6 – Design and coding standards . 239
Table R.7 – Software safety validation . 239
Table T.1 – Minimum property retention limits after UV-C exposure . 243
Table T.2 – Minimum electric strength for internal wiring after UV-C exposure . 244
Table U.1 – Examples of acceptable measures against unauthorised access and
transmission fault/error modes . 247
Table AA.1 – Examples for operating temperatures of the appliance . 249

– 6 – IEC 60335-2-40:2024 EXV © IEC 2024

Table BB.1 – Selected information about refrigerants . 250
Table DD.1 – Mandatory clauses in each of the instructions . 255
Table GG.1 – Outline of Annex GG . 269
Table GG.2 – Circulation airflow . 274
Table GG.3 – Appliance with packaging . 281
Table GG.4 – Appliance without packaging . 281
Table GG.5 – Minimum air velocity . 294
Table GG.6 – Refrigerant leak rate (ṁ ) . 297
leak
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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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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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
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s).
IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect
thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which may
be required to implement this document. However, implementers are cautioned that this may not represent the
latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC shall
not be held responsible for identifying any or all such patent rights.
This extended version (EXV) of the official IEC Standard provides the user with the full
content of the Standard.
made to IEC 60335-1:2020.
The specific content of IEC 60335-2-40:2024 is displayed on a blue background.

– 8 – IEC 60335-2-40:2024 EXV © IEC 2024

IEC 60335-2-40 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 eighth edition cancels and replaces the seventh edition published in 2022. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 12 : Part 1, Clause 12 has been made applicable;
b) Clause 19: requirement added for double wall heat exchangers to be resistant against
freezing;
c) Clause 20: requirement modified for when to apply test probe 18;
d) Clause 21: requirement added for double wall heat exchangers to resistant against the
pressure of the refrigerant if one of the walls fails;
e) Clause 22: requirement modified to reflect that appliances can operate continuously and
can be operated remotely without giving rise to a hazard, and requirement added for double
wall heat exchangers to be constructed to avoid refrigerant leaking into the secondary
circuit;
f) Annex LL has been deleted and replaced by a reference to IEC TS 63542:2024.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/538/FDIS 61D/542/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.
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.
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
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: Particular 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 of a less permanent nature 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).
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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 60335-2-40:2024 EXV © IEC 2024

INTRODUCTION to IEC 60335-1:2020
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 –
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 manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
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 differ.
If the functions of an appliance are covered by different parts 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.
Throughout this publication, when "part 2" is mentioned, it refers to the relevant part of
IEC 60335.
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.
Individual countries may wish to consider the application of this standard, as far as is
reasonable, to appliances not mentioned in a part 2, and to appliances designed on new
principles. In this case, consideration should be given to defining normal operation, specifying
the classification of the appliance according to Clause 6 and specifying whether the appliance
is operated attended or unattended. Consideration should also be given to particular categories
of likely users and to related specific risks such as access to live parts, hot surfaces or

hazardous moving parts.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of this standard if, when examined and tested, it is found to
have other features which 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 this
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 12 – IEC 60335-2-40:2024 EXV © IEC 2024

INTRODUCTION to IEC 60335-2-40:2024
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.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

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 other appliances including direct current (DC) supplied appliances
and battery-operated 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 laypersons 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
...

IEC 60335-2-40 ®
Edition 8.1 2026-08
INTERNATIONAL
STANDARD
CONSOLIDATED VERSION
Household and similar electrical appliances - Safety -
Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and
dehumidifiers
ICS 23.120 ISBN 978-2-8327-1448-5
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CONTENTS
FOREWORD . 5
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 11
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 . 27
9 Starting of motor-operated appliances . 27
10 Power input and current . 27
11 Heating . 27
12 Charging of metal-ion batteries . 30
13 Leakage current and electric strength at operating temperature . 31
14 Transient overvoltages . 31
15 Moisture resistance . 31
16 Leakage current and electric strength . 32
17 Overload protection of transformers and associated circuits . 32
18 Endurance . 32
19 Abnormal operation . 32
20 Stability and mechanical hazards . 40
21 Mechanical strength . 40
22 Construction . 42
23 Internal wiring . 56
24 Components . 57
25 Supply connection and external flexible cords . 58
26 Terminals for external conductors . 58
27 Provision for earthing . 59
28 Screws and connections . 59
29 Clearances, creepage distances and solid insulation . 59
30 Resistance to heat and fire . 59
31 Resistance to rusting . 60
32 Radiation, toxicity and similar hazards . 61
Annexes . 67
Annex D (normative) Thermal motor protectors . 67
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 67
Annex AA (informative) Examples for operating temperatures of the appliance . 68
Annex BB (normative) Selected information about refrigerants . 69
Annex CC (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 74
CC.1 General . 74
CC.2 Transport of equipment containing flammable refrigerants . 74
CC.3 Marking of equipment using signs . 74
CC.4 Disposal of equipment using flammable refrigerants . 74
CC.5 Storage of equipment/appliances . 74
CC.6 Storage of packed (unsold) equipment . 74
Annex DD (normative) Requirements for installation, service, maintenance and repair,
and decommissioning instructions of appliances using flammable refrigerants . 75
DD.1 General . 75
DD.2 Symbols . 76
DD.3 Information in instructions . 76
DD.4 Information on servicing . 79
DD.5 Sealed electrical components . 81
DD.6 Cabling . 81
DD.7 Detection of flammable refrigerants. 81
DD.8 Refrigerant removal and circuit evacuation . 82
DD.9 Charging procedures . 82
DD.10 Decommissioning . 83
DD.11 Labelling . 83
DD.12 Recovery . 83
Annex EE (normative) Pressure tests . 85
EE.1 General . 85
EE.2 Determination of standstill pressure . 85
EE.3 Strength pressure test. 85
EE.4 Fatigue test . 85
Annex FF (normative) Leak simulation tests . 87
FF.1 General . 87
FF.2 Test methods . 87
Annex GG (normative) Charge limits, ventilation requirements and requirements for
secondary circuits . 90
GG.1 Requirements for refrigerant charge limits. 90
GG.2 Requirements for charge limits in unventilated areas . 94
GG.3 Requirements for charge limits in areas with mechanical ventilation. 99
GG.4 Requirements for mechanical ventilation within the appliance enclosure . 99
GG.5 Requirements for mechanical ventilation for rooms complying with
ISO 5149-3 Void . 103
GG.6 Requirements for refrigerating systems employing secondary heat
exchangers . 103
GG.7 Factory sealed single package units which are not fixed appliances with a
refrigerant charge of m < m ≤ 2 × m . 105
1 c 1
GG.8 Ventilated area requirements for appliances using A2L refrigerants . 108
GG.9 Charge limits for appliances using A2L refrigerants connected via an air duct
system to one or more rooms . 110
GG.10 Allowable charge for enhanced tightness refrigerating systems using A2L
refrigerant . 112
GG.11 Ventilation for enhanced tightness refrigerating systems using A2L
refrigerants . 115
GG.12 Safety shut-off valves for enhanced tightness refrigerating systems using
A2L refrigerants . 118
GG.13 Safety alarms for enhanced tightness refrigerating systems using A2L
refrigerants . 118
GG.14 Allowable charge for enhanced tightness refrigerating systems using A2 or
A3 refrigerant . 121
Annex HH (informative) Competence of service personnel . 129
HH.1 General . 129
HH.2 Information and training . 129
Annex II (Void) . 131
Annex JJ (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 132
JJ.1 General . 132
JJ.2 Definition of the opening . 132
JJ.3 Determination of maximum allowable opening . 132
Annex KK (normative) Test method for Hot surface ignition temperature for A2L . 134
KK.1 General .
KK.2 Test equipment requirements .
KK.3 Procedure .
KK.4 Test report .
Annex LL (Void) . 138
Annex MM (normative) Refrigerant sensor location confirmation test . 139
MM.1 General . 139
MM.2 Test methods . 139
Annex NN (normative) Flame arrest enclosure verification test for A2L refrigerants . 142
NN.1 General . 142
NN.2 Test method . 142
Annex OO (Void) . 144
Annex PP (normative) Leak detection system confirmation test for flammable
refrigerants . 145
PP.1 General . 145
PP.2 Test method for leak detection systems using refrigerant detection systems
and ultrasonic based detection systems . 145
PP.3 Test method for leak detection systems using system parameter based
detection . 149
Annex QQ (normative) Methods for determining releasable charge . 151
QQ.1 General . 151
QQ.2 Determination of releasable charge by a simulated leak . 151
QQ.3 Determination of releasable charge by a simulated leak for refrigerating
systems complying with Clause GG.10. 153
QQ.4 Determination of releasable charge by calculation and test for refrigerating
systems complying with Clause GG.10. 154
QQ.5 Time before the leak is detected, t . 157
r1
QQ.6 Test conditions for releasable charge limited systems . 158
Bibliography . 159

Figure 101 – Example of label for field charged units . 62
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 64
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type . 65
Figure 104 – Power spectral density profile for vibration test in 21.101 . 65
Figure 105 – Dimensional details for the weight in the area of the pressure ball. 65
Figure 106 – Measurement before and after the test . 66
Figure GG.1 – Unventilated area . 124
Figure GG.2 – Mechanical ventilation . 125
Figure GG.3 – Relevant heights h , h and h for calculation of A and m . 126
inst 0 rel min max
Figure GG.4 – Airflow direction . 127
Figure GG.5 – Example of test set-up for GG.4.2.3 . 127
Figure GG.6 – Example of test set-up for gas separator effectiveness test . 128
Figure KK.1 – Front view of test apparatus labels .
Figure KK.2 – Test apparatus with dimensions .
Figure KK.3 – Top view of test apparatus .

Table 101 – Power spectral density profile for vibration test . 42
Table 102 – UV-C spectral irradiance measurement location . 62
Table AA.1 – Examples for operating temperatures of the appliance . 69
Table BB.1 – Selected information about refrigerants . 70
Table DD.1 – Mandatory clauses in each of the instructions . 76
Table GG.1 – Outline of Annex GG . 92
Table GG.2 – Circulation airflow . 97
Table GG.3 – Appliance with packaging . 107
Table GG.4 – Appliance without packaging . 108
Table GG.5 – Minimum air velocity . 120
Table GG.6 – Refrigerant leak rate (ṁ ) . 124
leak
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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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 60335-2-40 edition 8.1 contains the eight edition (2024-12) [documents 61D/538/FDIS and
61D/542/RVD] and its amendment 1 (2026-08) [documents 61D/568/FDIS and 61D/572/RVD].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red text.
A separate Final version with all changes accepted is available in this publication.

IEC 60335-2-40 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 eighth edition cancels and replaces the seventh edition published in 2022. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 12 : Part 1, Clause 12 has been made applicable;
b) Clause 19: requirement added for double wall heat exchangers to be resistant against
freezing;
c) Clause 20: requirement modified for when to apply test probe 18;
d) Clause 21: requirement added for double wall heat exchangers to resistant against the
pressure of the refrigerant if one of the walls fails;
e) Clause 22: requirement modified to reflect that appliances can operate continuously and
can be operated remotely without giving rise to a hazard, and requirement added for double
wall heat exchangers to be constructed to avoid refrigerant leaking into the secondary
circuit;
f) Annex LL has been deleted and replaced by a reference to IEC TS 63542:2024.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/538/FDIS 61D/542/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.
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.
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
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: Particular 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 of a less permanent nature 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).
The committee has decided that the contents of this document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
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.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.
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 other appliances including direct current (DC) supplied appliances
and battery-operated 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 laypersons 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 safety group A1, A2L, A2 and
A3 as defined by ISO 817. For refrigerant blends, the classification based on WCF is used.
Flammable refrigerants are limited to those of a molar mass of more than or equal to
42 kg/kmol as specified in ISO 817. For refrigerant blends, the molar mass shall be based on
WCF (worst case formulation) as specified in ISO 817.
NOTE 103 The tables with ISO 817 refrigerant data are provided at https://standards.iso.org/iso/817/ma/en/.
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 specify the criteria to ensure competence of persons during
installation, servicing and disposal. Safety requirements during disposal are not specified in
this standard.
NOTE 103104 Annex HH provides informative requirements on competence of personnel. 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.
NOTE 104105 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 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, 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 60335-2-34:20212024, 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
IEC TS 63542:2024, Refrigerant detection systems for flammable refrigerants
ISO 527-3, Plastics − Determination of tensile properties − Part 3: Test conditions for films and
sheets
ISO 817, Refrigerants – Designation and safety classification
ISO 1302 , 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 4126-1, Safety devices for protection against excessive pressure - Part 1: Safety valves
ISO 4126-2, Safety devices for protection against excessive pressure - Part 2: Bursting disc
safety devices
ISO 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, Non-ducted air conditioners and heat pumps – Testing and rating for performance
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, Packaging – Complete, filled transport packages and unit loads − Vertical random
vibration test
ISO 13971, Refrigeration systems and heat pumps - Flexible pipe elements, vibration isolators,
expansion joints and non-metallic tubes - Requirements and classification
ISO 14903:2025, 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
ISO 24664, Refrigerating systems and heat pumps - Pressure relief devices and their associated
piping - Methods for calculation
___________
Withdrawn.
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.
3.5.4 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
...

IEC 60335-2-40 ®
Edition 8.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 8.0 2024-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 978-2-8327-0073-0

– 2 – IEC 60335-2-40:2024 © IEC 2024
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 Charging of metal-ion batteries . 29
13 Leakage current and electric strength at operating temperature . 29
14 Transient overvoltages . 29
15 Moisture resistance . 30
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 . 40
23 Internal wiring . 53
24 Components . 53
25 Supply connection and external flexible cords . 54
26 Terminals for external conductors . 54
27 Provision for earthing . 55
28 Screws and connections . 55
29 Clearances, creepage distances and solid insulation . 55
30 Resistance to heat and fire . 55
31 Resistance to rusting . 56
32 Radiation, toxicity and similar hazards . 57
Annexes . 63
Annex D (normative) Thermal motor protectors . 63
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 63
Annex AA (informative) Examples for operating temperatures of the appliance . 64
Annex BB (normative) Selected information about refrigerants . 65
Annex CC (informative) Transportation, marking and storage for units that employ
flammable refrigerants . 69

Annex DD (normative) Requirements for installation, service, maintenance and repair,
and decommissioning instructions of appliances using flammable refrigerants . 70
Annex EE (normative) Pressure tests . 80
Annex FF (normative) Leak simulation tests . 82
Annex GG (normative) Charge limits, ventilation requirements and requirements for

secondary circuits . 84
Annex HH (informative) Competence of service personnel . 119
Annex II (Void) . 122
Annex JJ (normative) Allowable openings of relays and similar components to prevent
ignition of A2L refrigerants . 123
Annex KK (normative) Test method for hot surface ignition temperature for A2L . 125
Annex LL (Void) . 129
Annex MM (normative) Refrigerant sensor location confirmation test . 130
Annex NN (normative) Flame arrest enclosure verification test for A2L refrigerants . 133
Annex OO (Void) . 135
Annex PP (normative) Leak detection system confirmation test for flammable
refrigerants . 136
Annex QQ (normative) Methods for determining releasable charge . 142
Bibliography . 150

Figure 101 – Example of label for field charged units . 58
Figure 102 – Arrangement for heating test of appliances with supplementary air heater . 60
Figure 103 – Supply circuit for locked-rotor test of a motor of the single-phase type . 61
Figure 104 – Power spectral density profile for vibration test in 21.101 . 61
Figure 105 – Dimensional details for the weight in the area of the pressure ball . 61
Figure 106 – Measurement before and after the test . 62
Figure GG.1 – Unventilated area. 115
Figure GG.2 – Mechanical ventilation . 116
Figure GG.3 – Relevant heights h , h and h for calculation of A and m . 117
inst 0 rel min max
Figure GG.4 – Airflow direction . 118
Figure KK.1 – Front view of test apparatus labels . 125
Figure KK.2 – Test apparatus with dimensions . 126
Figure KK.3 – Top view of test apparatus . 127

Table 101 – Power spectral density profile for vibration test . 39
Table 102 – UV-C spectral irradiance measurement location . 57
Table AA.1 – Examples for operating temperatures of the appliance . 64
Table BB.1 – Selected information about refrigerants. 65
Table DD.1 – Mandatory clauses in each of the instructions . 70
Table GG.1 – Outline of Annex GG . 85
Table GG.2 – Circulation airflow . 90
Table GG.3 – Appliance with packaging . 97
Table GG.4 – Appliance without packaging . 97
Table GG.5 – Minimum air velocity . 110

– 4 – IEC 60335-2-40:2024 © IEC 2024
Table GG.6 – Refrigerant leak rate (ṁ ) . 114
leak
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
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60335-2-40 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 eighth edition cancels and replaces the seventh edition published in 2022. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 12 : Part 1, Clause 12 has been made applicable;
b) Clause 19: requirement added for double wall heat exchangers to be resistant against
freezing;
– 6 – IEC 60335-2-40:2024 © IEC 2024
c) Clause 20: requirement modified for when to apply test probe 18;
d) Clause 21: requirement added for double wall heat exchangers to resistant against the
pressure of the refrigerant if one of the walls fails;
e) Clause 22: requirement modified to reflect that appliances can operate continuously and
can be operated remotely without giving rise to a hazard, and requirement added for double
wall heat exchangers to be constructed to avoid refrigerant leaking into the secondary
circuit;
f) Annex LL has been deleted and replaced by a reference to IEC TS 63542:2024.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/538/FDIS 61D/542/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.
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.
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
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: Particular 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 of a less permanent nature 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).
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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 60335-2-40:2024 © IEC 2024
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.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods of measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

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 other appliances including direct current (DC) supplied appliances
and battery-operated 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 laypersons 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 specify 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 personnel. 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.

– 10 – IEC 60335-2-40:2024 © IEC 2024
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.
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, 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
IEC TS 63542:2024, Refrigerant detection systems for flammable refrigerants
ISO 527-3, Plastics − Determination of tensile properties − Part 3: Test conditions for films and
sheets
ISO 817, Refrigerants – Designation and safety classification
ISO 1302 , 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, Non-ducted air conditioners and heat pumps – Testing and rating for performance
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, 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.
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.
___________
Withdrawn.
– 12 – IEC 60335-2-40:2024 © IEC 2024
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)
3.119
hydronic fan coil unit
factory-made assembly which provides the function of forced circulation of air for heating and/or
cooling, which can 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.

– 14 – IEC 60335-2-40:2024 © IEC 2024
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 the 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
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 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
evaporating unit
factory-made assembly that includes one or more motor-compressors, evaporator in cooling
mode, expansion device(s), and motor-driven fan, blower or pump to circulate fluid through the
evaporator with associated operational controls in addition to the necessary wiring
Note 1 to entry: These units are intended for field connection to a condenser unit. An evaporating unit can also
be equipped to operate in the reverse cycle mode and can include provision for electric resistance heating or similar
sources of auxiliary heat.
3.132
evaporator unit
factory-made assembly that includes one or more evaporators in cooling mode, and can
include a motor-driven fan, blower or pump to circulate fluid through the evaporator with
associated operational controls in addition to the necessary wiring
Note 1 t
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