Household refrigerating appliances - Characteristics and test methods - Part 2: Performance requirements

EN-IEC 62552-2 specifies the essential characteristics of household refrigerating appliances cooled by internal natural convection or forced air circulation, and specifies test methods for checking the characteristics. This part of IEC 62552 describes the methods for the determination of performance requirements. Although there is some commonality in the set-ups for different tests (and so it may be an advantage to apply them all to one sample), these are separate tests to evaluate specific characteristics of the sample being tested. This part of IEC 62552 does not specify a procedure to generalise the results from sample test results to a prediction of the characteristics of the whole population from which that sample was selected.

Haushaltskühlgeräte - Eigenschaften und Prüfverfahren - Teil 2: Leistungsanforderungen

Appareils de réfrigération à usage ménager - Caractéristiques et méthodes d'essai - Partie 2: Exigences de performances

L'IEC 62552-2:2015 spécifie les caractéristiques essentielles des appareils de réfrigération à usage ménager refroidis par convection naturelle interne ou par circulation d'air forcé, et spécifie les méthodes d'essai pour la vérification des caractéristiques.
La présente partie de l'IEC 62552 décrit les méthodes de détermination des exigences de performances. Même si les montages présentent certaines similitudes pour les différents essais (et qu'il peut donc s'avérer avantageux de les appliquer à un seul échantillon), il s'agit d'essais distincts permettant d'évaluer les caractéristiques spécifiques de l'échantillon en essai. La présente partie de l'IEC 62552 ne spécifie pas de procédure visant à généraliser les résultats d'essai sur échantillon à une prédiction des caractéristiques de l'ensemble de la population à partir de laquelle ces échantillons ont été sélectionnés.
L'IEC 62552-1, l'IEC 62552-2 et l'IEC 62552-3 annulent et remplacent la première édition de l'IEC 62552 publiée en 2007. L'IEC 62552-1, l'IEC 62552-2 et l'IEC 62552-3 constituent une révision technique et incluent les modifications techniques suivantes par rapport à l'IEC 62552:2007:
- Un essai de capacité de refroidissement a été ajouté dans la Partie 2 (la présente partie).
- Un essai de mise en régime a été ajouté dans la Partie 2 (la présente partie).
- Des essais de performance ont été ajoutés pour les appareils de stockage du vin dans la Partie 2 (la présente partie).

Gospodinjski hladilni aparati - Značilnosti in preskusne metode - 2. del: Zahtevane lastnosti

General Information

Status
Published
Publication Date
10-May-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-May-2020
Due Date
10-Jul-2020
Completion Date
11-May-2020

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SLOVENSKI STANDARD
SIST EN 62552-2:2020
01-junij-2020
Nadomešča:
SIST EN 62552:2013
Gospodinjski hladilni aparati - Značilnosti in preskusne metode - 2. del: Zahtevane
lastnosti
Household refrigerating appliances - Characteristics and test methods - Part 2:
Performance requirements
Haushaltskühlgeräte - Eigenschaften und Prüfverfahren - Teil 2: Leistungsanforderungen
Appareils de réfrigération à usage ménager - Caractéristiques et méthodes d'essai -
Partie 2: Exigences de performances
Ta slovenski standard je istoveten z: EN 62552-2:2020
ICS:
97.040.30 Hladilni aparati za dom Domestic refrigerating
appliances
SIST EN 62552-2:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62552-2:2020

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SIST EN 62552-2:2020


EUROPEAN STANDARD EN 62552-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2020
Supersedes EN 62552:2013 (partially) and all of its
ICS 97.030 amendments and corrigenda (if any)

English Version
Household refrigerating appliances - Characteristics and test
methods - Part 2: Performance requirements
(IEC 62552-2:2015 , modified)
Appareils de réfrigération à usage ménager - Haushaltskühlgeräte - Eigenschaften und Prüfverfahren -
Caractéristiques et méthodes d'essai - Partie 2: Exigences Teil 2: Leistungsanforderungen
de performances (IEC 62552-2:2015 , modifiziert)
(IEC 62552-2:2015 , modifiée)
This European Standard was approved by CENELEC on 2020-02-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62552-2:2020 E

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
Contents Page
European foreword . 3
1 Modification to the Introduction . 4
2 Modification to Clause 1, "Scope" . 4
3 Modification to Clause 2, "Normative references" . 4
4 Modifications to Clause 4, "Performance requirements and tests covered in this standard" . 4
5 Modifications to Clause 6, "Storage test" . 5
6 Modification to Clause 8, "Freezing capacity test" . 8
7 Addition of new Clause Z10 "Airborne acoustical noise" . 13
8 Modifications to Annex A, “Pull-down test” . 14
9 Addition of Annex ZA, “Normative references to international publications with their corresponding
European publications” . 15
10 Addition of Annexes ZZA, "Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) 2019/2019 aimed to be covered" . 15
11 Addition of Annexes ZZB, "Relationship between this European Standard and the energy labelling
requirements of Commission Delegated Regulation (EU) 2019/2016 aimed to be covered" . 17
12 Addition of the Bibliography . 18

2

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
European foreword
This document (EN 62552-2:2020) consists of the text of IEC 62552-2:2015 prepared by IEC/TC 59
“Performance of household and similar electrical appliances”, together with the common modifications
prepared by CLC/TC 59X “Performance of household and similar electrical appliances”.
The following dates are fixed:
• latest date by which this document has (dop) 2021-02-24
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-02-24
standards conflicting with this document
have to be withdrawn
This standard in combination with standards EN 62552-1:2020 and EN 62552-3:2020 will supersede
EN 62552:2013.
This standard shall be read in combination with standards EN 62552-1:2020 and EN 62552-3:2020
EN 62552-2:2020 includes the following significant technical changes:
a) scope is enlarged with respect to similar refrigerating appliances;
b) Table 1 and Clauses 6.3.2.1 and Clause 8 were modified completely;
c) Clause Z1 on airborne acoustical noise was added.
Clauses, subclauses, notes, tables, figures and annexes which are additional to those in IEC 62552-2:2015
are prefixed “Z”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under Standardization Request M/459 given to CENELEC by the
European Commission and the European Free Trade Association, and supports essential requirements of
EU Directive(s).
Endorsement notice
The text of IEC 62552-2:2015 was approved by CENELEC as a European Standard with agreed common
modifications.
3

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
1 Modification to the Introduction
Add the following paragraph:
"This standard was developed in relationship with Regulations (EU) 2019/2016 of 11.3.2019 on energy
labelling and (EU) 2019/2019 of 1.10.2019 on ecodesign for refrigerating appliances"
2 Modification to Clause 1, "Scope"
Replace the first paragraph with the following:
"This part of EN 62552 specifies the essential characteristics of household and similar refrigerating
appliances cooled by internal natural convection or forced air circulation, and establishes test methods for
checking these characteristics"
3 Modification to Clause 2, "Normative references"
Add the following reference:
"EN 60704-2-14, Household and similar electrical appliances — Test code for the determination of airborne
acoustical noise — Part 2-14: Particular requirements for refrigerators, frozen food storage cabinets and
food freezers"
4 Modifications to Clause 4, "Performance requirements and tests covered in
this standard"
In 4.7, "Test summary", Replace Table 1 with the following:
"
Table 1 — Performance test summary
Temperature
Clause / Pantry
Fresh 1 and 3 and requirement
Annex Ambient  and Chill zero star
food 2 star 4 star s after test
and Test cellar
has started
1 star: Type a
Packages No Type b No
Other: Type a
Clause 6 To hold initial
Various
or b
Storage
values
Initial temp Mean Instant Mean Max
Packages No Type b No No No
Clause 7
For test load
Cooling 25 °C
+4 °C ± Maximum/ Average/
final only
Initial temp Table 2 Table 2
capacity
0,5 K minimum minimum
M-packages only
Packages Type b No Type a
Clause 8
Type b
Yes excursion
Freezing 25 °C
and final
capacity Not
Initial temp Table 2 Maximum/minimum
measured
4

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
Temperature
Clause / Pantry
Fresh 1 and 3 and requirement
Annex Ambient  and Chill zero star
food 2 star 4 star s after test
and Test cellar
has started
Clause 9 Packages No
Auto ice- 25 °C No
Initial temp As for Table 2 Maximum/minimum
making
Packages No
Annex A
Max Final only
Pull-down
Initial temp Maximum temperature according climate class rating
No
Packages Type b No Type a

For –18 °C
Annex C
compartment
25 °C
Temp rise
s only
Initial temp Not specified –18 °C
25 °C for Packages No
Annex D
SN and N To hold initial
Conden-
32 °C for values
Initial temp ≤ energy test temperatures as in Table 1 in IEC 62552-3:2015
sation
ST and T
NOTE 1 For definitions of symbols, see 3.7 in EN 62552-1.
NOTE 2 In the event of any discrepancy between data in this Table and the individual test procedures, the test procedures take
precedence.
NOTE 3 Wine storage test parameters are specified in Annex B.
"
Replace footnote b of Table 2 with the following:
"b
During a defrost and recovery period, these storage temperatures of frost-free refrigerating
appliances are permitted to rise by no more than 3 K with respect to the storage temperature during period
S (see 6.4). The storage temperature is defined as the maximum temperature of any M-package during a
given time period. (See Figure 3.)"
Add the NOTE Z1 in Table 2:
"NOTE Z1 Chill compartment shall be in compliance with the verification test available in Annex ZA
“Chill compartment temperature control test” of EN 62552-3."
5 Modifications to Clause 6, "Storage test"
In 6.1, "Objective", replace the third paragraph with:
"To meet these test requirements, there shall be, for any ambient temperature between and including the
minimum and maximum ambient temperature defined by the rated climate class, at least one control setting
at which all compartments meet the specified internal temperatures. The control(s) however, may be
adjusted for testing at different ambient temperatures."
In 6.2, "Preparation of refrigerating appliance", replace the sixth paragraph with:
"Thermal storage devices shall be placed in the dedicated positions in the respective compartments,
according to the manufacturer’s instructions and shall be independent of location of packages. Instructions
for loose placement of thermal storage devices in the appliance do not define dedicated positions.
NOTE 1 Instructions without specific indication of location or placement of thermal storage device is an example of
loose placement
5

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
If dedicated positions are absent, the thermal storage devices shall be removed from the compartment.
The unloaded refrigerating appliance should be set up and operated until it has reached equilibrium at, or
close to, the temperatures specified in Table 2.
The unloaded refrigerating appliance should be set up and operated until it has reached equilibrium at, or
close to, the temperatures specified in Table 2."
Replace subclause 6.3.2.1, "General" with the following:
"All test packages and M-packages shall be as specified in Clause C.2 b) of EN 62552-1:2019.
For determining the storage temperature of any chill compartment, the storage load shall be in
accordance with 6.3.2.2.
The temperatures of the chill compartment T are the instantaneous temperatures of each M-package
cci
in that compartment. The temperatures and conditions specified in Table 2 shall apply.
All test packages and M-packages shall be positioned or suspended so that their largest surface is
horizontal. They may be positioned directly on the floor of the compartment or drawer but shall always be
at least 25 mm away from all walls and ceilings and from the other packages of the test load. The test
packages and M-packages shall be positioned as far as possible in the corners of the compartment and at
two vertical levels:
A) Bottom level, which is the lowest horizontal surface intended for storage
B) Top level, where the packages have 25 mm clearance from the compartment ceiling. Supports can be
used to position the packages.
Loading of packages shall be in the following order:
1. Front left corner of the bottom level
2. Back right corner of the top level
3. Front right corner of the top level
4. Left back corner of the bottom level
5. Front left corner of the top level
6. Back right corner of the bottom level
7. Front right corner of the bottom level
8. Left back corner of the top level
9. Centre of the bottom level
10. Centre of the top level
Loading shall start using M-packages, up to the amount specified in Table 3. After the last M-package,
normal test packages shall be loaded until the total number of packages is reached.
If a package cannot be placed according to the required order, its position shall be skipped and the number
of packages shall be reduced. The number of M-packages shall not be reduced.
In the case of a compartment with special subdivisions (shelves, etc.) which are part of the design, if the
dimensions are too small to allow the horizontal positioning of the M-packages, it is permissible to position
them vertically.
6

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
If the dimensions are too small to accommodate an M-package (for example in door shelves), a special
support shall be used to position the M-package next to the shelf and as close as possible to the door liner."
Replace subclause 6.3.2.2, "Chill compartment storage load" with the following:
"The compartment shall be loaded with the number of packages specified in Table 3.
Table 3 — Chill compartment storage load
Volume, V, of chill compartment Total number of M-packages
[l] packages
V < 10
2 2
10 ≤ V < 20 3 2
20 ≤ V < 30 4 2
30 ≤ V < 40 5 3
40 ≤ V < 50 6 3
50 ≤ V < 60 7 4
60 ≤ V < 70 8 4
70 ≤ V < 80 9 5
V ≥ 80 10 5
"
In 6.3.3.3.1, "General" replace the last paragraph of bullet point c) with:
"Surfaces intended for storage with ribs, depressions, slight inclinations (lower than 8 degree), etc. are
treated as horizontal surfaces. If necessary, packers may be used to stabilize stacks.
NOTE 1 Inclinations of less than 15 mm per 100 mm, which equals the width or length of a test package, are
considered slight inclinations."
In 6.4.2, "Details" replace Table 4 with:
"
Table 4 – Requirements for periods S and E
Are there With more than one
Without With only one defrost
temperatu defrost control cycles
Item defrost control cycle starting
re control starting within a 24 h
control cycles within a 24 h test
cycles? test
No Each period shall be at least 3 h long
Length of
periods S
Each period shall consist of the same integral number of temperature
Yes
and E
control cycles totalling not less than 3 h.
Location No
Any convenient Period S ends just before a defrost and recovery
of period
time period begins.
Yes
S
7

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
Are there With more than one
Without With only one defrost
temperatu defrost control cycles
Item defrost control cycle starting
re control starting within a 24 h
control cycles within a 24 h test
cycles? test
Period E ends just before
Period E ends at least 24
the first defrost and
Period E ends
h after period S begins
recovery period that
at least 24 h
No and before the beginning
begins after 24 h after the
after period S
of the next defrost and
start of period S
begins
recovery period

Period E ends
Location
Period E ends with the
Period E ends with the
with the
of period
conclusion of a
conclusion of the last
conclusion of a
E
temperature control
temperature control cycle
temperature
cycle that is in progress
completed before the first
control cycle
Yes at least 24 h after period
defrost and recovery
that is in
S begins and before the
period that begins after 24
progress at
beginning of the next
h after the start of period S
least 24 h after
defrost and recovery
the beginning

period

of period S
"
In 6.4.2, "Details" replace Figure 3 with:
"

Figure 3 — Storage test sequence illustration

6 Modification to Clause 8, "Freezing capacity test"
Replace all of Clause 8 with the following:
8

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
"8.1 Objective
The purpose of this test is to measure the freezing capacity of freezer compartment(s) by adding warm
test packages (the light load) into the compartment. If the freezing capacity is greater than, or equal to,
the specified minimum capacity (see 8.4.3), the compartment(s) may be rated as a four-star
compartment(s).
8.2 Method overview
Apart from space for the light load, ballast packages are loaded into the frozen compartment(s) as for the
storage test (Clause 6). The refrigerating appliance is operated until temperatures are stable and in
compliance with Table 2. Then a load of packages at +25 °C is added. This is the so-called light load
representing a food load to be processed. The time to freeze this load to –18 °C is measured. When this
can be achieved in no more than 24 h and other maximum temperature-excursion conditions are met, a
four-star compartment rating may be claimed.
NOTE 1 Because the frozen compartment loading is largely the same as for the storage test, there might be an
advantage in doing these tests consecutively.
8.3 Set-up procedure
8.3.1 Ambient temperature
The ambient temperature shall be 25 °C (see A.3.2.3 of EN 62552-1:2019).
8.3.2 Preparation of the refrigerating appliance
8.3.2.1 General
The refrigerating appliance shall be installed according to Annex B of EN 62552-1:2019.
If the configuration of the refrigerating appliance can be changed by the user the configuration with the
greatest volume at the lowest temperatures shall be used for this test.
Refrigerating appliances with anti-condensation heater(s) which are permanently on during normal use
shall be tested with the heater(s) operating.
Anti-condensation heaters which can be manually controlled by the user shall be switched on and, if
adjustable, they shall be set at their maximum heating rate.
Anti-condensation heaters which are automatically controlled shall be allowed to operate normally.
Thermal storage devices shall be placed in the dedicated positions in the respective compartments,
according to the manufacturer’s instructions and shall be independent of location of packages. Instructions
for loose placement of thermal storage devices in the appliance do not define dedicated positions.
NOTE Z1 Instructions without specific indication of location or placement of thermal storage device is an example of
loose placement.
If dedicated positions are absent, the thermal storage devices shall be removed from the compartment.
The unloaded refrigerating appliance should be set up and operated until it has reached equilibrium at, or
close to, the temperatures specified in Table 2.
8.3.2.2 Measurement of temperature of chill compartment and all compartments operating above
0 °C
During the test, the chill compartment temperature is not measured, but it shall be loaded with test
packages as for the storage temperature measurement (see 6.3.2). For determining the storage
temperature of the compartments normally operating above 0 °C, measurement points shall be as per
Annex D of EN 62552-1:2019 but with M-packages used instead of cylinders.
8.3.3 Loading of refrigerating appliance
8.3.3.1 Frozen compartment(s) – ballast load
9

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
8.3.3.1.1 General
Apart from space for the light load in the appropriate –18 °C compartment(s), ballast packages are
brought to the approximate compartment temperatures and loaded into the frozen compartment(s) as for
the storage test (Clause 6).
A load stack comprises one or more load packages.
In the –18 °C compartment(s), ballast load may be removed to accommodate the light load with the
following constraints:
a) The minimum amount of stacks shall be removed
b) The height of a light load stack shall be 2 packages with the following exceptions:
1. if the light load is to be composed of an odd number of packages, then one light load stack of 1
package is allowed;
2. if the ballast load to be removed only exists out of stacks of 1 package, these shall be replaced
with light load stacks of 1 package;
3. if the ballast load stack to be removed contains 6 or more packages, then it shall be replaced with
a light load stack of half the number of packages in the ballast load stack (rounded down).
c) The minimum ballast load is 1 M-package
d) Light load packages shall be placed flat
e) Light load positioning shall take into account the instructions regarding the location to be used for
freezing. If no instructions are given, the packages shall be placed such that they are likely to be frozen
as rapidly as possible.
f) Light load packages shall be separated by at least 15 mm from ballast load packages. The use of
spacers between adjacent stacks of packages is permitted, but other spacing methods are not (see
6.3.3.2).
If the instructions indicate that there is a separate section for freezing food, this section shall be used for the
light load.
8.3.3.1.2 M-package placement in the ballast load to accommodate the light load
The M-packages in the ballast load shall be located as for the storage test apart from any locations that
are disrupted by the need to leave space for the light load. In that case, the M-packages shall be placed in
the nearest equivalent position to that specified for the storage test and the new positions recorded. If there
are stacks of ballast load packages beside the light load an M-package shall also replace the top test
package in at least one of those stacks on each side of the light load. If there is ballast load above the
light load an M-package shall replace a test package in the centre of the layer immediately above the light
load. If there is ballast load below the light load an M-package may replace a test package in the centre
of the layer immediately below the light load.
8.3.3.2 Refrigerating appliances with separate three-star compartment
If a refrigerating appliance has a separate three-star compartment with its own external access door or
lid, and the instructions recommend that, before freezing, frozen food already in storage be placed in that
compartment while leaving space in the freezer compartment to receive the load for freezing (i.e. the
three-star compartment is to be regarded as an extension of the freezer compartment), a freezing time
claim based upon this method of use is permissible, provided that:
10

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
a) when tested according to this method of use, the claimed freezing time is confirmed and the
temperature requirements for the other compartments (see 8.5 a) to g)), if applicable, are fulfilled
during the freezing capacity test, and
b) the light load used in the freezer compartment is at least equivalent to 3,5 kg/100 l of the combined
volumes of the freezer compartment and three-star compartment.
8.4 Test procedure
8.4.1 Starting conditions
After all relevant control devices have been adjusted as required, the loaded refrigerating appliance is left
to run until stable operating conditions are reached.
After stable operating conditions have been attained, internal temperature(s) shall be in accordance with
Table 2 except that the starting temperature of any compartment(s) with no lower temperature limit(s)
specified in that table shall be no more than 2 K below the target temperature.
In the case of a refrigerating appliance where the compartment temperatures cannot be adjusted
independently, if such a setting is not possible, the non-complying compartments below the bottom limit
shall be set to be as warm as possible.
The temperature indication succession from left to right in Table 2 also indicates the order of precedence in
the case of several temperature possibilities.
In some circumstances it might be unnecessary to carry out the stabilization specified here before the
stabilization specified in 8.4.2.
8.4.2 Setting of control devices
If the refrigerating appliance is provided with means for a pre-freezing (fast-freezing or quick-freezing)
operation, after stable operating conditions in accordance with 8.4.1 have been attained, the
refrigerating appliance shall be set in operation in the pre-freezing condition according to the instructions.
The procedure specified in 8.4.3 shall then be carried out.
If there are no special instructions for pre-freezing, the procedure according to 8.4.3 shall be carried out
after the refrigerating appliance has reached stable operating conditions in accordance with the
temperature requirements of 8.4.1.
8.4.3 Freezing of the light load
After the conditions specified in 8.4.2 have been attained, the light load shall be introduced. For models
with defrost control cycles, the light load should be added when stability has been regained and
temperature criteria met after a defrost and recovery period. This test should not overlap a defrost and
recovery period. When stability has been achieved prior to the introduction of the light load, apart from as
in 8.4.2, changes of setting of manually adjustable controls are no longer permitted.
The light load shall be 3,5 kg/100 l of the total volume of all compartments operating at −18 °C (three and
four stars). The calculated load shall be rounded up to the nearest 0,5 kg, except that in no case shall it be
less than 2,0 kg.
The light load is made from packages which have previously been brought to a temperature of
+25 °C ± 1 K.
The light load packages shall be placed flat and positioned taking into account the instructions and the
requirements of the loading storage plan (see Clause 6). If no instructions are given, the packages shall
be placed such that they are likely to be frozen as rapidly as possible.
Light load packages shall be separated by at least 15 mm from ballast load packages. The use of spacers
between adjacent stacks of packages is permitted, but other spacing methods are not (see 6.3.3.2).
M-packages shall be uniformly distributed throughout the light load with at least one as close as practicable
to its geometric centre. The number of M-packages to apply is given in the table below:
11

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SIST EN 62552-2:2020
EN 62552-2:2020 (E)
Light load [kg] Number of M-packages inside the light load
2 2
2,5 or 3 3
3,5 or 4 4
4,5 or 5 5
> 5 6
8.4.4 Intermediate test data to be recorded
The temperatures of the M-packages in the ballast load and in the light load shall be recorded, together
with those of the M-packages in the other compartment(s), if any. This shall be done until the arithmetic
mean of the instantaneous temperatures of all the M-packages in the light load reaches ≤ –18 °C and all
other criteria in 8.5 are satisfied. The time necessary for reaching this condition shall be noted.
If during the test an M-package exhibits a supercooling effect, the test is invalid and shall be repeated,
possibly with a replaced M-package.
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid below its
freezing point without it becoming a solid. It can be observed during the test as a rapid increase of the
temperature in an M package. Only in case the increase is more than 3 K, the test shall be considered
invalid.
Z8.5 Determination of the freezing time and freezing capacity and four-star rating
The freezing time ends when the arithmetic mean of the instantaneous temperatures of all the M-packages
in the light load reaches ≤ –18 °C and the following conditions are met:
a) unless a defrost and recovery period overlaps the test, the maximum temperature of any M-packages
of the ballast load remains ≤ –15 °C and at the end of the test the maximum temperature of the
warmest M-package of the ballast load is ≤ –18 °C;
b) if a defrost and recovery period does overlap the test, the maximum temperature of any M-packages
of the ballast load remains ≤ –12 °C during the defrost and recovery period and at the end of the
test the maximum temperature of the warmest M-package of the ballast load is ≤ –18 °C;
c) the maximum temperature of the warmest M-package in any separate three-star compartment not
used for ballast in accordance with 8.3.3.2 remains ≤ –18 °C (plus the allowed excursions during any
defrost and recovery period as specified in T
...

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