IEC 60335-2-34:2012/AMD1:2015

IEC 60335-2-34 ®
Edition 5.0 2015-05
INTERNATIONAL
STANDARD
colour
inside
AMENDMENT 1
Household and similar electrical appliances – Safety –
Part 2-34: Particular requirements for motor-compressors

IEC 60335-2-34:2012-05/AMD1:2015-05(en)

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IEC 60335-2-34 ®
Edition 5.0 2015-05
INTERNATIONAL
STANDARD
colour
inside
AMENDMENT 1
Household and similar electrical appliances – Safety –

Part 2-34: Particular requirements for motor-compressors

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.130.20 ISBN 978-2-8322-2654-4

– 2 – IEC 60335-2-34:2012/AMD1:2015
© IEC 2015
FOREWORD
This amendment has been prepared by sub-committee 61C: Safety of refrigeration appliances
for household and commercial use, of IEC technical committee 61: Safety of household and
similar electrical appliances.
The text of this amendment is based on the following documents:
FDIS Report on voting
61C/597/FDIS 61C/603/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
 reconfirmed,
 withdrawn,
 replaced by a revised edition, or
 amended.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum of June 2015 have been included in this copy.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 12 months or later than 36 months from the date of publication.

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.
_____________
© IEC 2015
INTRODUCTION
Delete the ninth paragraph.
1 Scope
Add the following new paragraphs before Note 101:
This standard also covers
– multi-speed motor-compressors, that are motor-compressors, the speed of which can
be set to different values;
– variable capacity motor-compressors, that are motor-compressors where the capacity
of the compressor is controlled at fixed speeds.
2 Normative references
Replace "This clause of Part 1 is applicable." by "This clause of Part 1 is applicable except as
follows.
Addition:"
IEC 60079-15:2010, Explosive atmospheres – Part 15: Equipment protection by type of
protection ”n”
IEC 60851-4, Methods of test for winding wires – Part 4: Chemical properties
IEC 60851-5:2008, Winding wires – Test methods – Part 5: Electrical properties
ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs
3 Terms and definitions
3.107 Replace Note 1 to entry by the following:
Note 1 to entry: For the purpose of this standard, the following classifications of application categories are made
relative to the evaporation temperature range:
– low back pressure (LBP): denotes an evaporation temperature range from –35 ºC to –15 ºC;
– medium back pressure (MBP): denotes an evaporation temperature range from –20 ºC to 0 ºC;
– high back pressure (HBP): denotes an evaporation temperature range from –5 ºC to 15 ºC.
Add the following new definition:
3.111
two-stage motor-compressor
motor-compressor comprising two compressors and one motor in a single housing
5 General conditions for the tests
Add the following new subclause:
5.103 For cascade systems comprising two or more motor-compressor circuits, each motor-
compressor circuit is tested separately in the end product. IEC 60335-2-34 is not applicable
for the system but each motor-compressor can be tested according to this standard.

– 4 – IEC 60335-2-34:2012/AMD1:2015
© IEC 2015
6 Classification
6.101 Delete the third paragraph.
Add the following new subclause:
6.105 Motor-compressors using refrigerant R744 shall be classified as used in a
transcritical refrigeration system or in a non-transcritical refrigeration system.
Compliance is checked by inspection and by the relevant tests.
7 Markings and instructions
Add the following:
7.1 Addition:
Motor-compressors suitable for use with a flammable refrigerant shall be marked with
symbol ISO 7010 W021.
7.6 Addition:
Symbol ISO 7010 W021 Warning; flammable materials

Add the following new subclause:
7.101 Refrigerants that can be used with the motor-compressor shall be listed in the
instructions.
Compliance is checked by inspection.
22 Construction
22.7 Add the following as a new second dashed item to the second paragraph of the test
specification:
– for R-744 non-transcritical refrigeration systems, a minimum of 3,5 times the saturated
vapour pressure of the refrigerant at 27 °C, rounded up to the next 0,5 MPa (5 bar).
Add the following after the existing second dashed as a new dashed item to the second
paragraph of the test specification:
– if the motor-compressor employs a bypass valve, a minimum of 3 times the maximum
high side pressure, but not less than the minimum test pressure as required in Table 101.
In the third paragraph of the test specification beginning "The test values for some
refrigerants are given in Table 101" change the style to italic font.

© IEC 2015
Add the following as a last entry to Table 101:
Non-transcritical
R-744 23,0 (230)
CO
Add the following as new paragraphs immediately before Note 102:
A housing which is exposed only to low side pressure in R-744 non-transcritical
refrigeration systems shall be subjected to a pressure equal to a minimum of 5 times the
saturated vapor pressure of the refrigerant at − 6,5 °C or equal to 13,5 MPa (135 bar),
whichever is higher, rounded up to the next 0,2 MPa (2 bar).
A housing which is exposed only to low side pressure in transcritical refrigeration systems
shall be subjected to a pressure equal to a minimum of 5 times the design pressure but not
less than the minimum test pressure as required by Table 102.
For a motor-compressor employing a bypass valve, the housing which is exposed only to
low side pressure shall be subjected to a pressure equal to 3 times the maximum low side
pressure, but not less than the minimum test pressure as required in Table 102.
In the existing fifth paragraph of the test specification beginning "The test values for some
refrigerants are given in Table 102" change the style to italic font.
Add the following as a last entry to Table 102:
Non-transcritical
R-744 14,0 (140)
CO
22.9 Replace Note 101 by the following:
For the types of refrigerant and types of oil for which the motor-compressor is intended to be
used, compliance of winding wire insulation shall be checked by the tests detailed in
Annex BB or motor-compressors that do not use oil by test 16 in IEC 60851-4 for resistance
to refrigerants.
For test 16 in IEC 60851-4, the percentage of extractable matter shall not exceed 0,5 %. The
breakdown voltage shall be at least 75 % of the minimum specified value.
For the types of refrigerant and types of oil for which the motor-compressor is intended to be
used, compliance of tie cords and insulation materials other than winding wire insulation shall
be checked by the tests detailed in Annex CC.
24 Components
Add the following new subclause:
24.101 In motor-compressors that employ flammable refrigerants, components that may
arc or spark during normal operation of the end product shall comply with the requirements
of IEC 60079-15, as modified by Annex DD, for group IIA gases or the refrigerant used. This
requirement is not applicable to components within the housing.
Compliance is checked by inspection and the appropriate tests of IEC 60079-15.

– 6 – IEC 60335-2-34:2012/AMD1:2015
© IEC 2015
Annex AA – Running overload tests for motor-compressors classified as tested
with Annex AA
AA.1 Add the following to the end of the first paragraph:
Excluding starting current, the maximum value of the current averaged over any 5 min period
is recorded. The interval between current measurements shall not exceed 30 s. The starting
current is considered to be excluded if the first current measurement is made approximately
1 min after starting.
NOTE 1 The current is recorded to aid in checking reproducibility of test results.
Renumber existing Notes 1 to 6 as Notes 2 to 7.
AA.2 Add the following to the first paragraph as a new second sentence:
However, for R-744 refrigerant intended for use in a transcritical refrigeration system, for
all tests the maximum operating discharge pressure is 12 MPa and the return gas temperature
is +25 °C.
Table AA.1 – Substitute refrigeration circuit conditions for operating under running
overload conditions
Replace the fourth column by the following:
Evaporation temperature
°C
–15
–15
+15
+15
–15
–15
+15
+15
–15
–15
+15
+15
Add a new row at the bottom of the table as follows:
NOTE For R-744 refrigerant intended for use in a non-transcritical refrigeration system, for all tests the
evaporation temperature is –15 ºC, the condensation temperature is +20 ºC , the motor compressor ambient
temperature is +43 ºC and the return gas temperature is +2 ºC.

© IEC 2015
AA.4 Add the following to the first paragraph as a new second sentence:
However, for R-744 refrigeran
...