EN IEC 63437:2026

SLOVENSKI STANDARD
oSIST prEN IEC 63437:2025
01-maj-2025
Hladilni aparati za delovanje izven omrežja in pri nezanesljivem omrežju za
domačo in lahkotno komercialno uporabo - Značilnosti in preskusne metode -
Zahtevane lastnosti in poraba energije
Off grid and unreliable grid refrigerating appliances for domestic and light commercial
use - Characteristics and test methods - Performance requirements and energy
consumption
Appareils de réfrigération hors réseau et sur réseau peu fiable pour un usage
domestique et commercial léger - Caractéristiques et méthodes d'essai - Exigences
d'aptitude à la fonction et consommation d'énergie
Ta slovenski standard je istoveten z: prEN IEC 63437:2025
ICS:
97.040.30 Hladilni aparati za dom Domestic refrigerating
appliances
oSIST prEN IEC 63437:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63437:2025
oSIST prEN IEC 63437:2025
59M/182/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63437 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-03-14 2025-06-06
SUPERSEDES DOCUMENTS:
59M/173/CD, 59M/177A/CC
IEC SC 59M : PERFORMANCE OF ELECTRICAL HOUSEHOLD AND SIMILAR COOLING AND FREEZING APPLIANCES
SECRETARIAT: SECRETARY:
Italy Ms Milena Presutto
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
Energy Efficiency,Environment
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which t hey
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses
to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC
clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Off grid and unreliable grid refrigerating appliances for domestic and light commercial use -
Characteristics and test methods - Performance requirements and energy consumption

PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
The CDV of IEC 63437 Ed1 has been prepared by SC59M/WG6 Test standard for refrigerated appliances for use
with off grid or weak grid, under the convenorship of Mr Patrick Becks.

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You
may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without permis sion
in writing from IEC.
oSIST prEN IEC 63437:2025
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1 CONTENTS
3 FOREWORD . 8
4 INTRODUCTION . 10
5 1 Scope . 11
6 2 Terms and definitions . 14
7 2.1 General . 14
8 2.1.1 Refrigerating appliance . 14
9 2.1.2 Refrigerator . 14
10 2.1.3 Refrigerator-freezer . 14
11 2.1.4 Freezer . 14
12 2.1.5 Light commercial use . 14
13 2.1.6 Variable temperature compartment . 14
14 2.1.7 Continuous supply refrigerating appliance . 14
15 2.1.8 Solar direct drive (SDD) refrigerating appliance . 14
16 2.1.9 Battery supported solar refrigerating appliances . 15
17 2.1.10 Hybrid refrigerating appliance . 15
18 2.1.11 Intermittent supply refrigerating appliance . 15
19 2.1.12 Distorted supply refrigerating appliance . 15
20 2.1.13 Foodstuff . 15
21 2.1.14 Rated . 15
22 2.1.15 Auxiliary . 15
23 2.2 Unreliable grid supply . 15
24 2.2.1 Unreliable grid . 15
25 2.2.2 Intermittent grid . 15
26 2.2.3 Distorted grid . 15
27 2.2.4 Unreliable grid nominal test voltage . 15
28 2.2.5 Power outage . 16
29 2.2.6 Voltage sag . 16
30 2.2.7 Voltage surge . 16
31 2.2.8 Intermittent supply class . 16
32 2.2.9 Distorted supply class . 16
33 2.2.10 Withstand supply class . 16
34 2.2.11 Unreliable grid class protection code . 16
35 2.2.12 Voltage protector . 16
36 2.3 Off grid supply . 16
37 2.3.1 Off grid . 16
38 2.3.2 Off grid nominal test voltage . 16
39 2.3.3 Solar class. 17
40 2.3.4 Minimum supply time . 17
41 2.3.5 Functional supply . 17
42 2.4 Technical . 17
43 2.4.1 Thermal store . 17
44 2.4.2 Electrical battery . 17
45 2.4.3 Charging time . 17
46 2.4.4 Solar panel . 17

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47 2.4.5 Inverter . 17
48 2.4.6 Rectifier . 17
49 2.5 Compartments . 17
50 2.5.1 Compartment . 17
51 2.5.2 Unfrozen compartment . 18
52 2.5.3 Frozen compartment . 18
53 2.5.4 Fresh food compartment . 18
54 2.5.5 Sub cellar compartment . 18
55 2.5.6 Cellar compartment . 18
56 2.5.7 Pantry compartment . 18
57 2.5.8 Chill compartment . 18
58 2.5.9 Zero star compartment . 18
59 2.5.10 One star compartment . 18
60 2.5.11 Two star compartment . 18
61 2.5.12 Three star compartment . 18
62 2.5.13 Compartment volume . 18
63 2.5.14 Appliance volume . 19
64 2.5.15 Shelf . 19
65 2.5.16 Dummy shelf . 19
66 2.5.17 Water container . 19
67 2.5.18 M-Container . 19
68 2.5.19 Effective bottom . 19
69 2.6 Performance characteristics . 19
70 2.6.1 Starting current . 19
71 2.6.2 Pull down time . 19
72 2.6.3 Water cooling time . 19
73 2.6.4 Water freezing time . 19
74 2.6.5 Energy consumption . 19
75 2.6.6 High ambient storage and energy consumption . 19
76 2.6.7 Under voltage . 20
77 2.6.8 Over voltage . 20
78 2.6.9 Holdover time . 20
79 2.6.10 Ambient temperature . 20
80 2.6.11 Steady state condition . 20
81 3 Categorization of refrigerating appliances in scope . 21
82 4 Compartment storage temperature specifications . 22
83 4.1 Calculation of Tc_min, Tc_max and Tcm for refrigerating appliances with a
84 vertical door . 22
85 4.2 Calculation of Tc_min, Tc_max and Tcm for refrigerating appliances with a
86 horizontal door or lid . 23
87 5 Instruments, accuracy and precision of measurements . 25
88 5.1 General . 25
89 5.2 Electrical energy consumption . 25
90 5.3 Humidity . 25
91 5.4 Length . 25
92 5.5 Mass . 25
93 5.6 Temperature . 25
94 5.7 Time . 25
95 5.8 Voltage and frequency . 25

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96 5.9 Maximum current . 26
97 5.10 DC Power supply . 26
98 6 General test conditions . 27
99 6.1 General . 27
100 6.2 Ambient temperatures . 27
101 6.2.1 Sensors . 27
102 6.2.2 Temperature stability . 27
103 6.2.3 Climate classes . 28
104 6.3 Ambient relative humidity . 28
105 6.4 Test room configuration . 28
106 6.4.1 Platform . 28
107 6.4.2 Rear wall or partition . 29
108 6.4.3 Side partitions . 29
109 6.4.4 Sensor location . 29
110 6.4.5 Test room general configuration . 29
111 6.5 Electricity supply . 30
112 6.5.1 General . 30
113 6.5.2 AC supply unreliable grid . 31
114 6.5.3 DC Supply off grid . 34
115 6.5.4 AC/DC supply for hybrid refrigerating appliances . 37
116 7 Preparation of an appliance for testing and general procedures . 38
117 7.1 Running in of new appliances . 38
118 7.2 Installation of the appliance in the test room . 38
119 7.2.1 General . 38
120 7.2.2 Rear clearance . 38
121 7.3 Setting up . 38
122 7.3.1 General . 38
123 7.4 Variable temperature compartment . 38
124 7.5 Pre-test condition . 39
125 7.5.1 Refrigerating appliances without an electrical battery to supply the
126 compressor . 39
127 7.5.2 Off grid battery supported solar refrigerating appliances . 42
128 8 Location of compartment temperature sensors . 45
129 8.1 General . 45
130 8.2 Compartment with a vertical door . 45
131 8.3 Compartment with a horizontal door or lid . 46
132 9 Volume . 48
133 9.1 Introduction . 48
134 9.2 Test procedure. 48
135 9.2.1 Volume measurements . 48
136 9.2.2 Determination of volume . 48
137 9.2.3 Volume of evaporator space . 49
138 10 Maximum current test . 49
139 10.1 Introduction . 49
140 10.2 Test procedure. 49
141 11 Pull down test . 50
142 11.1 Introduction . 50

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143 11.2 Test procedure. 50
144 11.3 Data to record and report . 50
145 12 Water cooling test . 51
146 12.1 Introduction . 51
147 12.2 Load . 51
148 12.3 Test procedure. 53
149 12.4 Data to record and report . 54
150 13 Water freezing test . 54
151 13.1 Load . 54
152 13.2 Test procedure. 55
153 13.3 Data to record and report . 56
154 14 Energy consumption test . 57
155 14.1 Introduction . 57
156 14.2 Test procedure. 57
157 14.3 Data to record and report . 57
158 15 High ambient storage and energy consumption test (only valid for ST and T
159 appliances) . 58
160 15.1 Introduction . 58
161 15.2 Test procedure. 58
162 15.3 Data to record and report . 58
163 16 Low ambient storage test . 58
164 16.1 Introduction . 58
165 16.2 Test procedure. 58
166 16.3 Data to record and report . 59
167 17 Holdover test . 60
168 17.1 Introduction . 60
169 17.2 Test procedure: . 60
170 17.3 Data to record and report . 61
171 18 Solar class test . 62
172 18.1 Introduction . 62
173 18.2 Test procedure. 62
174 18.3 Data to record and report . 62
175 19 Under and over voltage test . 63
176 19.1 Introduction . 63
177 19.2 Test procedure. 63
178 19.3 Data to record and report for the under and for the over voltage test. 64
179 20 Voltage withstand test . 65
180 20.1 Introduction . 65
181 20.2 Test procedure. 65
182 20.3 Data to record and report . 65
183 21 Polarity check test . 66
184 21.1 Test procedure. 66
185 21.2 Data to record and report . 66
186 22 Summary of compartment load, electrical battery state and thermal store
187 conditions . 67
188 23 Marking . 68
189 23.1 Rating plate information . 68

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190 23.2 Specification sheet. 69
191 23.3 Identification of frozen compartments . 69
192 23.4 Load limit lines . 69
193 Annex A (informative) Background information and arguments for the standard . 71
194 A.1 Background . 71
195 A.2 Rationales . 72
196 Annex B (informative) Test points solar classes . 74
197 Annex C (informative) Recommendations for future standard updates . 76
198 Annex D (informative) Bibliography . 77
200 Figure 1 – Example calculation of Tc_min and Tc_max for refrigerating appliances with
201 a vertical door . 23
202 Figure 2 – Example calculation of Tc_min and Tc_max for refrigerating appliances with
203 a horizontal door or lid . 24
204 Figure 3 – Verification of parameters to be kept constant . 27
205 Figure 4 – Partitions to restrict air circulation and ambient temperatures sensor
206 positions . 30
207 Figure 5 – AC supply signals . 33
208 Figure 6 – Daily solar class supply signals . 35
209 Figure 7 – Daily functional supply signal . 36
210 Figure 8 – Pre-test condition A, Example 1 applying an Intermittent supply class 4
211 supply signal . 39
212 Figure 9 – Pre-test condition A, Example 2 applying an intermittent supply class 5
213 supply signal . 41
214 Figure 10 – Pre-test condition B for holdover test, example 1 . 41
215 Figure 11 – Pre-test condition B for holdover test, example 2 . 42
216 Figure 12 – Pre-test condition C Example 1 applying an intermittent supply class 4
217 supply signal . 43
218 Figure 13 – Pre-test condition C Example 2 applying an intermittent supply class 5
219 supply signal . 43
220 Figure 14 – Pre-test condition D for holdover test, example 1 . 44
221 Figure 15 – Pre-test condition D for holdover test, example 2 . 44
222 Figure 16 – Location of temperature sensors vertical door refrigerating appliances . 45
223 Figure 17 – Location of temperature sensors horizontal door or lid refrigerating
224 appliances . 46
225 Figure 18 – Load and position of the water and M-containers on each shelf for
226 appliances with a vertical door and on the dummy shelf for horizontal appliances with a
227 dummy shelf (water cooling test). 52
228 Figure 19 – Load and position of the M-containers on the shelve (water freezing test) . 55
229 Figure 20 – Star identification symbols for frozen compartments . 69
230 Figure 21 – Marking of load limit (dimension in millimetres) . 69
232 Table 1 – Unreliable grid refrigerating appliance categories and their configuration
233 codes . 21
234 Table 2 – Off grid refrigerating appliance categories and their configuration codes . 21
235 Table 3 – Compartment temperature specification . 22

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236 Table 4 – Climate classes . 28
237 Table 5 – Ambient test conditions . 28
238 Table 6 – AC Unreliable grid supply signals . 32
239 Table 7 – Intermittent AC voltage supply class . 32
240 Table 8 – AC Voltage distorted supply class . 33
241 Table 9 – AC Voltage withstand supply class . 34
242 Table 10 – DC Off grid supply signals . 34
243 Table 11 – Functional supply signal . 36
244 Table 12 – Intermittent DC voltage supply class . 37
245 Table 13 – Testing days energy consumption test . 57
246 Table 14 – Testing days solar class test . 62
247 Table 15 – Compartment load, electrical battery condition and thermal store state at
248 the start of each test . 67
oSIST prEN IEC 63437:2025
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251 INTERNATIONAL ELECTROTECHNICAL COMMISSION
252  ____________
254 OFF GRID AND UNRELIABLE GRID REFRIGERATING APPLIANCES FOR
255 DOMESTIC AND LIGHT COMMERCIAL USE -
256 CHARACTERISTICS AND TEST METHODS – PERFORMANCE
257 REQUIREMENTS AND ENERGY CONSUMPTION
260 FOREWORD
261 1) The International Electrotechnical Commission (IEC) is a worldwide organization for
262 standardization comprising all national electrotechnical committees (IEC National
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269 work. International, governmental and non-governmental organizations liaising with the IEC
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271 Organization for Standardization (ISO) in accordance with conditions determined by
272 agreement between the two organizations.
273 2) The formal decisions or agreements of IEC on technical matters express, as nearly as
274 possible, an international consensus of opinion on the relevant subjects since each technical
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288 6) All users should ensure that they have the latest edition of this publication.
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290 individual experts and members of its technical committees and IEC National Committees
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294 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced
295 publications is indispensable for the correct application of this publication.
296 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may
297 be the subject of patent rights. IEC shall not be held responsible for identifying any or all
298 such patent rights.
299 IEC 63437 has been prepared by subcommittee 59M/WG6: Performance of electrical household
300 and similar cooling and freezing appliances, of IEC technical committee 59: Performance of
301 household and similar electrical appliances. It is an International Standard.

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302 Background information and arguments for this standard are provided in Annex B.
303 The following print types are used in this international standard:
304 – requirements: in roman type;
305 – test variables: in italic type;
306 – notes: in small roman type.
307 – words in bold are defined in Clause 0;
308 The text of this International Standard is based on the following documents:
Draft Report on voting
310 Full information on the voting for its approval can be found in the report on voting indicated in
311 the above table.
312 The language used for the development of this International Standard is English.
313 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
314 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
315 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
316 described in greater detail at www.iec.ch/publications.
317 The committee has decided that the contents of this document will remain unchanged until the
318 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
319 specific document. At this date, the document will be
320 • reconfirmed,
321 • withdrawn,
322 • replaced by a revised edition, or
323 • amended.
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325 INTRODUCTION
326 The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed
327 that compliance with this document may involve the use of a patent. IEC takes no position
328 concerning the evidence, validity, and scope of this patent right.
329 The holder of this patent right has assured IEC that s/he is willing to negotiate licences under
330 reasonable and non-discriminatory terms and conditions with applicants throughout the world.
331 In this respect, the statement of the holder of this patent right is registered with IEC. Information
332 may be obtained from the patent database available at patents.iec.ch/.
333 Attention is drawn to the possibility that some of the elements of this document may be the
334 subject of patent rights other than those in the patent database. IEC shall not be held
335 responsible for identifying any or all such patent rights.
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338 OFF GRID AND UNRELIABLE GRID REFRIGERATING APPLIANCES FOR
339 DOMESTIC AND LIGHT COMMERCIAL USE-
340 CHARACTERISTICS AND TEST METHODS – PERFORMANCE
341 REQUIREMENTS AND ENERGY CONSUMPTION
344 1 Scope
345 This document specifies the essential characteristics of off grid and unreliable grid
346 refrigerating appliances for domestic and similar use or light commercial use, cooled by
347 internal natural or forced air convection. It defines input voltage supply signals for appliances
348 designed for unreliable grid and off grid conditions.
349 An unreliable grid condition can be the result of disturbances on the electricity supply, such
350 as power outages, or issues with power quality, such as voltage spikes and surges, that could
351 cause performance challenges to refrigerating appliances. An off grid supply, in this context,
352 for example is generated by a solar panel or a stand-alone solar home system that is not
353 connected to the power grid. The standard simulates the power characteristics in off grid and
354 unreliable grid conditions but does not prescribe requirements or test procedures to assess
355 performance of generators, solar panels, solar home system or any other system generating a
356 supply signal.
357 The supply signals defined in this document can also be used for evaluation of the performance
358 of other refrigerating appliances such as medical or laboratory appliances, professional
359 storage refrigerators and/or freezers, refrigerated display cabinets, beverage coolers or ice
360 cream freezers.
361 This standard prescribes the test methods for measuring the functional performance
362 characteristics and requirements. The standard does not apply to refrigerating appliances
363 designed for a good quality and stable electricity grid and refrigerating appliances utilising
364 fuelled absorption cooling technology.
365 This standard is applicable to any refrigerating appliance for domestic or light commercial
366 use that has a rated performance to properly operate off grid or under unreliable grid
367 operating conditions resisting power interruptions and supply variations. Off grid and
368 unreliable grid refrigerating appliances are appliances intended to for use with standalone
369 or intermittent and/or distorted electrical mains. Electrical mains supply is assumed to be
370 alternating current (AC) for unreliable grid or direct current (DC) for off grid. The standard is
371 also applicable to hybrid refrigerating appliances.
372 The test procedures primary focus on the performance of the overall refrigerating appliances
373 and not on the specific performance of auxiliary components such as electrical batteries,
374 inverters or rectifiers or any device intended to improve the power quality but external to the
375 appliance itself. In case a refrigerating appliance is supplied with control unit, an electrical
376 battery, a voltage protector, an inverter or a rectifier in the original product packaging, these
377 components are considered as a component of the refrigerating appliance and should be
378 connected during testing.
379 The tests defined in this standard aim to assess the fundamental design and functional
380 operation of the refrigerating appliance as well as its resilience to given power quality issues.
381 Unreliable Grid (UG) refrigerating appliance categories in scope:
382 1. UG : AC voltage supplied refrigerating appliances designed for proper operation during
intermittent
383 intermittent power outages, containing an internal thermal store and/or electrical battery.
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385 2. UG : AC voltage refrigerating appliances designed for operation when connected to a
distorted
386 distorted grid supply (for example voltage sags or voltage surges).
388 3. UG AC voltage refrigerating appliances designed for operation with
in
...