ISO 13253:2017

INTERNATIONAL ISO
STANDARD 13253
Third edition
2017-07
Ducted air-conditioners and air-to-air
heat pumps — Testing and rating for
performance
Climatiseurs et pompes à chaleur air/air raccordés — Essais et
détermination des caractéristiques de performance
Reference number
ISO 13253:2017(E)
©
ISO 2017

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ISO 13253:2017(E)

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© ISO 2017, Published in Switzerland
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ISO 13253:2017(E)

Contents Page
Foreword .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 4
5 Airflow setting . 7
5.1 General . 7
5.2 Indoor airflow setting . 7
5.3 ESP for rating . 7
5.4 Outdoor airflow . 9
5.5 Unit supplied without indoor fan. 9
6 Cooling tests . 9
6.1 Cooling capacity tests . 9
6.1.1 General conditions . 9
6.1.2 Temperature conditions .10
6.1.3 Test conditions.11
6.2 Maximum cooling performance test.11
6.2.1 General conditions .11
6.2.2 Temperature conditions .11
6.2.3 Airflow conditions .12
6.2.4 Test conditions.12
6.2.5 Performance requirements .12
6.3 Minimum cooling performance test .13
6.3.1 General conditions .13
6.3.2 Temperature conditions .13
6.3.3 Airflow conditions .13
6.3.4 Test conditions.14
6.3.5 Performance requirements .14
6.4 Condensate control and enclosure sweat performance test .15
6.4.1 General conditions .15
6.4.2 Temperature conditions .15
6.4.3 Airflow conditions .15
6.4.4 Test conditions.15
6.4.5 Performance requirements .15
7 Heating tests.16
7.1 Heating capacity tests .16
7.1.1 General conditions .16
7.1.2 Temperature conditions .17
7.1.3 Airflow conditions .17
7.1.4 Defrost operation .18
7.1.5 Test procedure — General .18
7.1.6 Preconditioning period .19
7.1.7 Equilibrium period . . .19
7.1.8 Data collection period .19
7.1.9 Test procedure when a defrost cycle (whether automatically or manually
initiated) ends the preconditioning period .20
7.1.10 Test procedure when a defrost cycle does not end the preconditioning period .20
7.1.11 Test procedure for transient tests .20
7.1.12 Heating capacity test results . .22
7.2 Maximum heating performance test .22
7.2.1 General conditions .22
7.2.2 Temperature conditions .22
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ISO 13253:2017(E)

7.2.3 Airflow conditions .22
7.2.4 Test conditions.23
7.2.5 Performance requirements .23
7.3 Minimum heating performance test .23
7.3.1 General conditions .23
7.3.2 Temperature conditions .23
7.3.3 Airflow conditions .23
7.3.4 Test conditions.23
7.3.5 Performance requirements .24
7.4 Automatic defrost performance test .24
7.4.1 General conditions .24
7.4.2 Temperature conditions .24
7.4.3 Airflow conditions .24
7.4.4 Test conditions.24
7.4.5 Performance requirements .25
8 Test methods and uncertainties of measurement .25
8.1 Test methods .25
8.1.1 General.25
8.1.2 Calorimeter test method .25
8.1.3 Indoor air enthalpy method .25
8.1.4 Capacity tests .26
8.2 Uncertainty of measurement .26
8.3 Test tolerances for steady-state cooling and heating capacity tests .27
8.4 Test tolerances for performance tests .28
9 Test results .28
9.1 Capacity results .28
9.1.1 General.28
9.1.2 Adjustments .29
9.1.3 Cooling capacity calculations .29
9.1.4 Heating capacity calculations .29
9.2 Data to be recorded .30
9.3 Test report .33
9.3.1 General information .33
9.3.2 Capacity test results .33
9.3.3 Performance tests .33
10 Marking provisions .34
10.1 Nameplate requirements .34
10.2 Nameplate information .34
10.3 Split systems .34
11 Publication of ratings .34
11.1 Standard ratings .34
11.2 Other ratings .35
Annex A (normative) Airflow settings for ducted units .36
Annex B (normative) Test requirements .41
Annex C (informative) Airflow measurement .48
Annex D (normative) Calorimeter test method .54
Annex E (normative) Indoor air enthalpy test method .62
Annex F (informative) Refrigerant enthalpy test method .68
Annex G (informative) Outdoor air enthalpy test method .70
Annex H (informative) Indoor calorimeter confirmative test method .73
Annex I (informative) Outdoor calorimeter confirmative test method.75
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Annex J (informative) Balanced-type calorimeter confirmative test method .77
Annex K (informative) Cooling condensate measurements .78
Annex L (normative) Supplemental requirements when rating fan-less (coil-only) type units .79
Annex M (informative) Pictorial examples of the heating capacity test procedures given in 7.1 .82
Bibliography .89
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ISO 13253:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 86, Refrigeration and air-conditioning,
Subcommittee SC 6, Testing and rating of air-conditioners and heat pumps.
This third edition cancels and replaces the second edition (ISO 13253:2011), which has been technically
revised.
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INTERNATIONAL STANDARD ISO 13253:2017(E)
Ducted air-conditioners and air-to-air heat pumps —
Testing and rating for performance
1 Scope
This document specifies performance testing, the standard conditions and the test methods for
determining the capacity and efficiency ratings of air-cooled, air-conditioners and air-to-air heat pumps.
This document is applicable to the following equipment:
— ducted air-cooled air conditioners and ducted air to air heat pumps.
This document is limited to
— residential, commercial and industrial single-package, and split-system air conditioners and
heat pumps,
— factory-made, electrically driven and use mechanical compression,
— utilizing single, multiple and variable capacity components, and
— multiple split-system utilizing one or more refrigeration systems, one outdoor unit and one or more
indoor units, controlled by a single thermostat/controller.
The requirements of testing and rating contained in this document are based on the use of matched
assemblies.
This document is not applicable to the rating and testing of the following:
a) water-source heat pumps or water-cooled air-conditioners;
b) multi-split-system air-conditioners and air-to-air heat pumps (see ISO 15042 for testing of such
equipment);
c) mobile (windowless) units having a condenser exhaust duct;
d) individual assemblies not constituting a complete refrigeration system;
e) equipment using the absorption refrigeration cycle;
f) non-ducted equipment (see ISO 5151 for testing of such equipment);
g) ducted air conditioners and/or ducted heat pumps, rated at less than 8 kW and intended to operate
at external static pressures of less than 25 Pa, controlled by a single thermostat/controller (refer to
ISO 5151).
This document does not cover the determination of seasonal efficiencies, which can be required in some
countries because they provide a better indication of efficiency under actual operating conditions.
NOTE Throughout this document, the terms “equipment” and “systems” mean “air-conditioners” and/or
“heat pumps”.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
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ISO 13253:2017(E)

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
me a s ur ement (GUM: 1995)
ISO 817, Refrigerants — Designation and safety classification
ISO 5151, Non-ducted air conditioners and heat pumps — Testing and rating for performance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
ducted air-conditioner
encased assembly or assemblies designed primarily to provide ducted delivery of conditioned air to an
enclosed space, room or zone (conditioned space)
Note 1 to entry: It can be either single-package or split-system and comprises a primary source of refrigeration
for cooling and dehumidification. It can also include means for heating other than a heat pump, as well as means
for circulating, cleaning, humidifying, ventilating or exhausting air. Such equipment can be provided in more
than one assembly; the separated assemblies (split-systems) of which are intended to be used together.
3.2
ducted heat pump
encased assembly or assemblies designed primarily to provide ducted delivery of conditioned air to an
enclosed space, room or zone (conditioned space), including a prime source of refrigeration for heating
Note 1 to entry: It can be constructed to remove heat from the conditioned space and discharge it to a heat sink
if cooling and dehumidification are desired from the same equipment. It can also include means for circulating,
cleaning, humidifying, ventilating or exhausting air. Such equipment can be provided in more than one assembly;
the separated assemblies (split-systems) of which are intended to be used together.
3.3
standard air
dry air at 20,0 °C and at a standard barometric pressure of 101,325 kPa, having a mass density of
3
1 204 kg/m
3.4
total cooling capacity
amount of sensible and latent heat that the equipment can remove from the conditioned space in a
defined interval of time
Note 1 to entry: Total cooling capacity is expressed in units of watts.
3.5
heating capacity
amount of heat that the equipment can add to the conditioned space (but not including supplementary
heat) in a defined interval of time
Note 1 to entry: Heating capacity is expressed in units of watts.
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ISO 13253:2017(E)

3.6
latent cooling capacity
room dehumidifying capacity
amount of latent heat that the equipment can remove from the conditioned space in a defined
interval of time
Note 1 to entry: Latent cooling capacity and room dehumidifying capacity are expressed in units of watts.
3.7
sensible cooling capacity
amount of sensible heat that the equipment can remove from the conditioned space in a defined
interval of time
Note 1 to entry: Sensible cooling capacity is expressed in units of watts.
3.8
sensible heat ratio
SHR
ratio of the sensible cooling capacity (3.7) to the total cooling capacity (3.4)
3.9
rated voltage
voltage shown on the nameplate of the equipment
3.10
rated frequency
frequency shown on the nameplate of the equipment
3.11
energy efficiency ratio
EER
ratio of the total cooling capacity (3.4) to the effective power input (3.14) to the device at any given set of
rating conditions
Note 1 to entry: Where the EER is stated without an indication of units, it is understood that it is derived from
watts/watts.
3.12
coefficient of performance
COP
ratio of the heating capacity (3.5) to the effective power input (3.14) to the device at any given set of
rating conditions
Note 1 to entry: Where the COP is stated without an indication of units, it is understood that it is derived from
watts/watts.
3.13
total power input
P
t
average electrical power input to the equipment as measured during the test
Note 1 to entry: Total power input is expressed in units of watts.
3.14
effective power input
P
E
average electrical power input to the equipment, obtained from the following:
— the power input for operation of the compressor(s);
— the power input to electric heating devices used only for defrosting;
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ISO 13253:2017(E)

— the power input to all control and safety devices of the equipment;
— the power inp
...