IEC 62552-3:2015/AMD1:2020

IEC 62552-3 ®
Edition 1.0 2020-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Household refrigerating appliances – Characteristics and test methods –
Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes
d'essai –
Partie 3: Consommation d'énergie et volume

IEC 62552-3:2015-02/AMD1:2020-11(en-fr)

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IEC 62552-3 ®
Edition 1.0 2020-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Household refrigerating appliances – Characteristics and test methods –

Part 3: Energy consumption and volume

Appareils de réfrigération à usage ménager – Caractéristiques et méthodes

d'essai –
Partie 3: Consommation d'énergie et volume

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.030 ISBN 978-2-8322-9068-2

– 2 – IEC 62552-3:2015/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by subcommittee 59M: Performance of electrical household
and similar cooling and freezing appliances, of IEC technical committee 59: Performance of
household and similar electrical appliances.
The text of this amendment is based on the following documents:
FDIS Report on voting
59M/128/FDIS 59M/134/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 website 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• withdrawn,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.
_____________
5.1 General
Replace the NOTE with the following new content:
NOTE Refer to the requirements in Annex B of IEC 62552-1:2015 and IEC 62552-1:2015/AMD1:2020 for variable
temperature compartments. For energy testing, these are operated on the function (continuous temperature
operating range) that uses the most energy.

9 Test report
Replace the existing content with the following new content:
A test report should be prepared that includes all of the relevant information listed in Annex F of
IEC 62552-1:2015/AMD:2020 for tests undertaken in accordance with this document.

© IEC 2020
A.1 General
Replace the fourth paragraph with the following new content:
The refrigerating appliance shall have air temperature sensors installed at the positions
specified in Annex D of IEC 62552-1:2015 and IEC 62552-1:2015/AMD1:2020. The
determination of compartment air temperature during energy testing shall be as specified in
Annex D of IEC 62552-1:2015 and IEC 62552-1:2015/AMD1:2020.

A.2.6.1 General
Replace the fourth paragraph with the following new content:
Where the ice storage space occupies a complete compartment, the temperature sensor
placements shall be in accordance with Annex D of IEC 62552-1:2015 and
IEC 62552-1:2015/AMD1:2020 (not A.2.6.5 of this document).

A.2.6.5 Position of the temperature sensor in automatic icemakers
Replace the first sentence of the first paragraph with the following:
An automatic icemaker bin shall have a single temperature sensor located in the
position specified as follows for all energy tests:

B.4.3 Case SS2 calculation of values
Replace Formula (13) with the following new formula:
ΔTh
dfj−i
TT( )− (13)

SS2−i av−endX−endY−i
(tt− )

end−−Y end X

Replace the definition of ∆Th with:
df-i
∆Th is the accumulated temperature difference over time in each compartment i in Kh
dfj-i
as determined in accordance with C.3.3 for the defrost and recovery period j
commencing at the end of period X
Replace Formula (14) with the following new formula:
Rt −−Rt Δt
end−−Y end X drj
CRt = (14)
SS2
(tt− )
end−−Y end X
Replace the definition ∆t of with:
dr
∆t is the additional compressor run time in h as determined in accordance with C.3.3
drj
for the defrost and recovery period j commencing at the end of period X

=
– 4 – IEC 62552-3:2015/AMD1:2020
© IEC 2020
C.3.3 Case DF1 calculation of values
Add the following new content below the NOTE:
During a load processing efficiency test, it is possible that one or more defrosts occur for
which a correction must be made. This correction is based on splitting the defrost and recovery
energy in a fixed part and the energy used by the defrost heater:
Fixed defrost adder: ∆E = ∆E − E (63)
df-adderj dfj df-heaterj
where:
E is the measured defrost heater energy during the defrost and recovery period j,
df-heaterj
expressed in Wh
NOTE This formula is applied to each valid defrost during steady state. A representative value for the fixed defrost
adder (∆E ) is determined in accordance with Formula (64) and is subsequently used in the evaluation of a load
df-adder
processing test [using Formula (51) or, if multiple defrost systems are present, Formula (65)].
C.4 Number of valid defrost and recovery periods
At the end of the clause, add the following note:
NOTE The defrost heater energy E and incremental defrost and recovery energy ∆E for new appliances and
df-heaterj dfj
appliances that have not been operated for some time may be initially low until the defrost heater energy stabilises.
C.5 Calculation of representative defrost energy and temperature
Replace Formula (22) with the following new formula:
m
ΔE
∑ dfj
j=1
ΔE = F (22)
df df
m
Add the following text below the line ∆E :
dfj
F is a regional scaling factor that can be used to compensate for frost load and usage factor,
df
which impacts the defrost intervals. The default value for F is 1,0.
df
Add the following paragraph above Formula (23):
To correct a load processing efficiency test where one or more defrosts occurs, a
representative value for the fixed defrost adder is defined:
m
ΔE
∑ df−adderj
j=1
ΔE = (64)
df−adder
m
D.2 Elapsed time defrost controllers
Replace NOTE 2 with the following new note:
NOTE 2 The same timers could be used as compressor run time controllers or as elapsed time controllers,
depending on how they are configured in the refrigerating appliance.

© IEC 2020
D.3 Compressor run time defrost controllers
Replace the entire clause with the following:
D.3 Compressor run time defrost controllers
For these controllers, the defrost interval is defined by the compressor run time (or on time in
hours) (or, in some cases, the compressor run time plus the maximum time allocated for defrost
heater operation). These controllers are only applicable to single-speed compressors. The
defrost interval is therefore approximately inversely proportional to the total heat load on the
refrigeration system (ambient temperature and user loads plus any internal heat loads). The
most common defrost run time controllers range from 6 h to 12 h of compressor run time.
Typically, this would result in defrost intervals of the order of 12 h to 30 h (elapsed time) at
elevated ambient temperatures and somewhat longer defrost intervals at lower ambient
temperatures.
NOTE 1 The same timers could be used as compressor run time controllers or as elapsed time controllers,
depending on how they are configured in the refrigerating appliance.
If the run time controller is not accessible (or where it is not clear whether the controller is a run
time controller) or where the laboratory is not able to directly measure the controller operation
and does not know its run time, the value for the proxy run time shall be measured by testing as
set out below. Any routine energy tests or other tests may be used for this purpose.
Each measurement shall be undertaken over a whole defrost control cycle and tests shall be
undertaken in at least two different ambient temperatures in order to verify that it is a run time
controller and to estimate the value of t . The period selected shall comply with the following
prt
requirements:
• the first defrost shall qualify as a valid defrost as specified in Clause C.3;
• the test period shall include at least part of the subsequent defrost and recovery period
that is initiated automatically without any intervention (defrost heater on).
The estimated proxy run time of the compressor run time defrost controller for a given set of
test data that complies with these requirements is given by:
t = t + t (25)
prtj crtj dhj
where
t is the estimated proxy run time of the compressor run time defrost controller for the test
prtj
period starting with defrost and recovery period j in h;
t is the measured compressor run time in h from the initiation of defrost heater operation
crtj
for defrost and recovery period j to the initiation of defrost heater operation for the
subsequent defrost and recovery period j + 1;
is the time from the start of the defrost heater on until the compressor restarts, in h,
t
dhj
during defrost and recovery period j where the timer advances during the heater
operation; otherwise, a value of zero if the timer does not advance during the heater
operation.
NOTE 2 A common configuration is that the defrost heater is allocated a fixed maximum time of operation in the
timer defrost controller (say 20 min). The actual heater on time will vary depending on the frost load for the specific
defrost. The time between the heater off and the compressor on can vary, but the total time from heater on to
compressor on is typically constant in this configuration. Where the laboratory has any doubt about the appliance
configuration, it is assumed that the defrost timer does not advance when the defrost heater is on, so that only
compressor on time is counted and the value of t is set to zero in Formula (25).
dhj
Additional routine tests undertaken at other ambient temperatures and/or temperature
control settings, including user related loads, such as door openings and small processing

– 6 – IEC 62552-3:2015/AMD1:2020
© IEC 2020
loads, should be reviewed to assess defrosting behaviour. The observed defrost interval
should be consistent with the measured proxy run time, otherwise it shall be classified as a
variable defrost controller.
NOTE 3 These tests can be used to detect whether the run time controller is overridden by some other control
mechanism during normal use conditions.
To qualify as a compressor run time defrost controller, the coefficient of variation (standard
deviation divided by the mean) of the measured values for either compressor proxy run time
t or compressor run time alone t shall be less than 5 % for the defrost intervals
prtj crtj
examined. Where the product does not comply with this requirement, it shall be classified as a
variable defrost controller. The value of t used in subsequent calculations shall be the
prt
average of all measured values of t .
prtj
Once confirmed, the proxy run time can be used to calculate the actual defrost interval (in
elapsed time) for any temperature control setting, ambient temperature and load
processing condition, as a function of the compressor run time. For all refrigerating
appliances with compressor run time defrost controllers, the percentage run time shall be
reported for steady state conditions in Annex B and the extra compressor run time (in h) shall
be calculated for defrost and recovery periods (Annex C, Formula (21)). The defrost interval
for each test condition and temperature control setting is given by:
t −Δtt−
tt−Δ
prt dr dh
crt dr
t (26)
df
CRt CRt
SS SS
where
is the estimated defrost interval (elapsed time) for each temperature control setting
t
df
and ambient temperature under test, in h, including the impact of defrost and
recovery;
t is the representative measured proxy run time of the compressor run time defrost
prt
controller (in h) in accordance with Formula (25);
CRt is the compressor run time (as a percentage) during the steady state operation for
SS
each temperature control setting and ambient temperature under test as determined
in B.3.3 or B.4.3;
∆t is the representative incremental compressor run time (in h) for defrost and recovery
dr
in accordance with Annex C (Clause C.5) in accordance with Formula (21);
t is the representative time from the start of the defrost heater on until the compressor
dh
restarts (in h) during a defrost and recovery period where the timer advances during
the heater operation, otherwise a value of zero;
t is the representative compressor run time (in h) from the initiation of one defrost heater
crt
operation until the initiation of the next defrost heater operation (this can be determined
by rearranging Formula (25)).
The exclusion of the heater on time t and t is the default assumption for calculations in
dhj dh
Formula (25) and Formula (26). If the defrost timer does not advance during the defrost heater
and t is set to be zero for both
operation or if the laboratory is unsure, then the value of t
dhj dh
equations. Heater on time t and t shall be consistently applied in Formula (25) and Formula
dhj dh
(26).
D.4.1 Variable defrost controllers
Replace the first paragraph with the following:
For this type of controller, the defrost interval is varied in proportion to the frost load on the
evaporator. Most systems do not measure the frost load on the evaporator directly (but this is
==
© IEC 2020
possible), so these types of systems are usually controlled by software which uses a number of
parameters to indirectly estimate the frost load and adjust the defrost interval progressively.
D.4.2 Variable defrost controllers – declared defrost intervals
Replace the first bullet point of the third paragraph with the following:
Δt shall not exceed 12 h at an ambient temperature of 32 °C (elapsed time).
d-min
E.3.2 Requirements
Replace the second paragraph by the following new paragraph:
For linear interpolation to be valid, the temperature difference between test runs in the
compartment used for energy interpolation shall not exceed 4 K.
E.3.3 Calculations
Replace item 1 with the following content:
1) Check that ABS(T – T ) is 4 K or less and that one test point is below target temperature
i1 i2
and one test point is above target temperature. Where this condition is not met, linear
interpolation is not permitted on this compartment.

G.5.3 Quantification of additional energy used to process the load
Replace Formula (51) and the text below it with the following new content:
z
ΔΔE (E− E )− P×(t− t )− zE× − E (51)
additional−test end start after end start df−−adder ∑ df heater j
j=1
where
ΔE is the additional energy consumed by the refrigerating appliance during the
additional-test
test to fully process the loaded added as specified in Clause G.3;
E is the accumulated energy reading at the start of load processing efficiency
start
test as defined in G.4.1, in Wh;
E is the accumulated energy reading at the end of load processing efficiency
end
test as defined in G.4.4, in Wh;
P is the steady state power consumption that occurs after the load has been
after
fully processed during the valid energy test period (Clause B.3 or Clause B.4)
as defined in G.4.4, in W;
t is the test time at the start of load processing efficiency test as defined in
start
G.4.1, in h;
t is the test time at the end of load processing efficiency test as defined in
end
G.4.4, in h;
ΔEdf-adder is the average defrost adder calculated in Annex C for all valid defrosts for the
relevant ambient temperature;
z the number of defrosts that occur during the load processing efficiency test;
=
– 8 – IEC 62552-3:2015/AMD1:2020
© IEC 2020
𝑧𝑧
∑ 𝐸𝐸 is the sum of the defrost heater energy for the z defrosts that occur during the
𝑗𝑗=1 𝑑𝑑𝑑𝑑−ℎ𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒 𝑗𝑗
load processing efficiency test.
If there are multiple defrost systems active, the adder has to be defined for each defrost system
i in accordance with Formula (65). The additional energy to process the added load then
becomes:
n nz
ΔΔE = E− E − P×−t t − zE× − E (65)
( ) ( )
( )
additional−test end start after end start ∑ i df−−adder i ∑∑ df heater ij
i 11i j
where:
n is the number of defrost systems in the appliance;
z is the number of defrosts occurring during the load processing efficiency tests for defrost
i
system i.
G.5.5 Load processing multiplier
In the first sentence of the second paragraph, change processing load to processing load
(bold type).
H.2.2 Determination of volume
Replace the content of the subclause with the following new content:
H.2.2 Determination of volume
The volume shall take into account the exact shapes of the walls, including all depressions or
projections. For through-the-door ice and water dispensers, the ice chute shall be included in the
volume up to the dispensing function.
The items below shall be considered as being in place and their volumes deducted:
a) the volume of control housings, including integral parts of it;
b) the volume of the evaporator space (which includes any space made inaccessible by the
evaporator) (see H.2.3);
c) the volume of air ducts required for proper cooling and operation of the unit;
d) space occupied by shelves moulded into the inner door panel;
e) the volume of any insulating partition between compartments and/or sub-compartments.
An average thickness of greater than 5 mm is considered to be an insulating partition.
For clarification, the through-the-door ice and water dispensers and the insulating hump are not
included in the volume. No part of the dispenser unit shall be included as volume.
NOTE When the volume is determined, internal fittings are considered as not being in place, such as
• shelves,
• removable partitions,
• containers,
• convenience features (not classified as sub-compartments),
• interior light housings and lights.
H.2.3 Volume of evaporator space
Replace item c) with:
==
© IEC 2020
c) In the case of refrigerant-filled shelving, the volume above the uppermost shelf and below
the lowermost shelf, if the distance between the shelf and the nearest horizontal plane of
the cabinet inner wall is less than or equal to 50 mm. All refrigerated shelves are considered
as not present.
Add item d).
d) In the case where a fan is installed in an unfrozen compartment with a refrigerated wall
evaporator or a plate style evaporator, the volume of the fan and the fan scroll.
Add the new Clause H.4:
H.4 Calculation of the volume of the section or sub-compartment in the
compartment whose target temperatures are different from each other
Figures H.6 to H.10 show typical examples of volume calculation for a two-star section or
compartment inside the freezer compartment (three-star or four-star) and should be
considered as generic examples. The examples shown in Figures H.6 to H.10 may be combined
to adapt the calculation to be representative of the section or compartment in the refrigerating
appliance under consideration.
Figures H.6, H.7 and H.9 can also be appli
...