Multiple split-system air conditioners and air-to-air heat pumps — Testing and rating for performance

ISO 15042:2017 specifies the 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. ISO 15042:2017 is applicable to the following equipment: -― basic multi-split systems, modular multi-split systems and modular heat recovery multi-split systems. These multi-split systems include air-to-air systems with non-ducted and/or ducted indoor units with integral fans and indoor units supplied without fans. ISO 15042:2017 is limited to: - residential, commercial and industrial split-system air conditioners and heat pumps; - factory-made, electrically driven and use mechanical compression; - single- and multiple-circuit split-systems which utilize one or more compressors with no more than two steps of control of the outdoor unit; or - split-systems with a single refrigeration circuit which utilize one or more variable-speed compressors or alternative compressor combinations for varying the capacity of the system by three or more steps. These split-systems are designed to operate with a combination of one or more outdoor units and two or more indoor units designed for individual operation, and such modular systems are capable of transferring recovered heat from one or more indoor units to other units in the same system. The requirements of testing and rating contained in this document are based on the use of matched assemblies. ISO 15042:2017 is not applicable to the rating and testing of the following: a) water-cooled or water source equipment; b) mobile (single-duct) units having a condenser exhaust duct; c) individual assemblies not constituting a complete refrigeration system; d) equipment using the absorption refrigeration cycle. e) 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); f) multiple split-system utilizing one or more refrigeration systems, one outdoor unit and one or more indoor units, controlled by a single thermostat/controller (refer to ISO 5151 or ISO 13253). ISO 15042:2017 does not cover the determination of seasonal efficiencies or seasonal part-load performances, 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 "multi-split air conditioners" and/or "multi-split heat pumps".

Climatiseurs et pompes à chaleur air/air multi-split — Essais et détermination des caractéristiques de performance

General Information

Status
Published
Publication Date
17-Jul-2017
Current Stage
6060 - International Standard published
Start Date
18-Jul-2017
Completion Date
18-Jul-2017
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INTERNATIONAL ISO
STANDARD 15042
Second edition
2017-07
Multiple split-system air conditioners
and air-to-air heat pumps — Testing
and rating for performance
Climatiseurs et pompes à chaleur air/air multi-split — Essais et
détermination des caractéristiques de performance
Reference number
ISO 15042:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 15042:2017(E)
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© ISO 2017, Published in Switzerland

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ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 15042:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 2

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols .......................................................................................................................................................................................................................... 5

5 Airflow setting ......................................................................................................................................................................................................... 8

5.1 General ........................................................................................................................................................................................................... 8

5.2 Airflow setting for ducted indoor units ............................................................................................................................. 8

5.2.1 General...................................................................................................................................................................................... 8

5.2.2 Airflow setting procedure for ducted indoor units ............................................................................ 8

5.3 ESP for rating ............................................................................................................................................................................................ 8

5.4 Airflow setting for non-ducted indoor units measured by air enthalpy method .......................10

5.5 Outdoor airflow ...................................................................................................................................................................................10

5.6 Unit supplied without indoor fan.........................................................................................................................................10

6 Cooling tests ...........................................................................................................................................................................................................10

6.1 Cooling capacity test .......................................................................................................................................................................10

6.1.1 General conditions ......................................................................................................................................................10

6.1.2 Temperature conditions .........................................................................................................................................11

6.1.3 Test conditions................................................................................................................................................................12

6.2 Maximum cooling performance test..................................................................................................................................13

6.2.1 General conditions ......................................................................................................................................................13

6.2.2 Temperature conditions .........................................................................................................................................13

6.2.3 Airflow conditions .......................................................................................................................................................13

6.2.4 Test conditions................................................................................................................................................................13

6.2.5 Performance requirements ..................................................................................................................................13

6.3 Minimum cooling test ....................................................................................................................................................................15

6.3.1 General conditions ......................................................................................................................................................15

6.3.2 Temperature conditions .........................................................................................................................................15

6.3.3 Airflow conditions .......................................................................................................................................................15

6.3.4 Test condition ..................................................................................................................................................................15

6.3.5 Performance requirements ..................................................................................................................................16

6.4 Freeze-up drip test (applies to non-ducted multi-splits) ................................................................................16

6.4.1 General conditions ......................................................................................................................................................16

6.4.2 Temperature conditions .........................................................................................................................................16

6.4.3 Airflow conditions .......................................................................................................................................................16

6.4.4 Test conditions................................................................................................................................................................17

6.4.5 Performance requirements ..................................................................................................................................17

6.5 Condensate control test and enclosure sweat test ................................................................................................17

6.5.1 General conditions ......................................................................................................................................................17

6.5.2 Temperature conditions .........................................................................................................................................17

6.5.3 Airflow conditions .......................................................................................................................................................17

6.5.4 Test conditions................................................................................................................................................................18

6.5.5 Performance requirements ..................................................................................................................................18

7 Heating tests...........................................................................................................................................................................................................18

7.1 Heating capacity tests ....................................................................................................................................................................18

7.1.1 General conditions ......................................................................................................................................................18

7.1.2 Temperature conditions .........................................................................................................................................19

7.1.3 Airflow conditions .......................................................................................................................................................20

7.1.4 Defrost operation .........................................................................................................................................................20

7.1.5 Test procedure — General ....................................................................................................................................21

7.1.6 Preconditioning period ...........................................................................................................................................21

7.1.7 Equilibrium period .................. ......................................................................................................................... ...........21

© ISO 2017 – All rights reserved iii
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ISO 15042:2017(E)

7.1.8 Data collection period ..............................................................................................................................................21

7.1.9 Test procedure when a defrost cycle (whether automatically or manually

initiated) ends the preconditioning period (7.1.6) .........................................................................22

7.1.10 Test procedure when a defrost cycle does not end the preconditioning

period (7.1.6) ...................................................................................................................................................................22

7.1.11 Test procedure for transient tests ..................................................................................................................23

7.1.12 Heating capacity test results .................. .............................................................................................................24

7.2 Maximum heating performance test .................................................................................................................................24

7.2.1 General conditions ......................................................................................................................................................24

7.2.2 Temperature conditions .........................................................................................................................................24

7.2.3 Airflow conditions .......................................................................................................................................................25

7.2.4 Test conditions................................................................................................................................................................25

7.2.5 Performance requirements ..................................................................................................................................25

7.3 Minimum heating performance test ..................................................................................................................................25

7.3.1 General conditions ......................................................................................................................................................25

7.3.2 Temperature conditions .........................................................................................................................................25

7.3.3 Airflow conditions .......................................................................................................................................................26

7.3.4 Test conditions................................................................................................................................................................26

7.3.5 Performance requirements ..................................................................................................................................26

7.4 Automatic defrost performance test .................................................................................................................................26

7.4.1 General conditions ......................................................................................................................................................26

7.4.2 Temperature conditions .........................................................................................................................................27

7.4.3 Airflow conditions .......................................................................................................................................................27

7.4.4 Test conditions................................................................................................................................................................27

7.4.5 Performance requirements ..................................................................................................................................27

8 Heat recovery test .............................................................................................................................................................................................27

8.1 Heat recovery capacity ratings ...............................................................................................................................................27

8.1.1 General conditions ......................................................................................................................................................27

8.1.2 Temperature conditions .........................................................................................................................................27

9 Test methods and uncertainties of measurement ..........................................................................................................28

9.1 Test methods ..........................................................................................................................................................................................28

9.1.1 General...................................................................................................................................................................................28

9.1.2 Calorimeter test method ........................................................................................................................................28

9.1.3 Indoor air enthalpy method ................................................................................................................................28

9.1.4 Capacity tests ...................................................................................................................................................................29

9.2 Uncertainty of measurement ...................................................................................................................................................29

9.3 Test tolerances for the capacity tests ................................................................................................................................30

9.4 Test tolerances for performance tests .............................................................................................................................31

10 Test results ...............................................................................................................................................................................................................31

10.1 Capacity results ...................................................................................................................................................................................31

10.1.1 General...................................................................................................................................................................................31

10.1.2 Adjustments ......................................................................................................................................................................32

10.1.3 Cooling capacity calculations .............................................................................................................................32

10.1.4 Heating capacity calculations ............................................................................................................................32

10.1.5 Power input of fans .....................................................................................................................................................33

10.2 Data to be recorded ..........................................................................................................................................................................33

10.3 Test report ................................................................................................................................................................................................36

10.3.1 General information ...................................................................................................................................................36

10.3.2 Rating test results ........................................................................................................................................................36

10.3.3 Performance tests ........................................................................................................................................................36

11 Marking provisions .........................................................................................................................................................................................37

11.1 Nameplate requirements ............................................................................................................................................................37

11.2 Nameplate information ................................................................................................................................................................37

11.3 Split systems ..........................................................................................................................................................................................37

12 Publication of ratings ...................................................................................................................................................................................38

12.1 Standard ratings .................................................................................................................................................................................38

iv © ISO 2017 – All rights reserved
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ISO 15042:2017(E)

12.2 Other ratings ..........................................................................................................................................................................................38

Annex A (normative) Airflow settings for ducted units .................................................................................................................39

Annex B (normative) Test requirements ......................................................................................................................................................44

Annex C (informative) Airflow measurement ..........................................................................................................................................51

Annex D (normative) Calorimeter test method ......................................................................................................................................57

Annex E (normative) Indoor air enthalpy test method ..................................................................................................................65

Annex F (informative) Part-load capacity tests and determination of energy efficiency

ratios and coefficients of performance ......................................................................................................................................72

Annex G (informative) Individual indoor unit capacity tests ...................................................................................................73

Annex H (normative) Heat recovery test method ................................................................................................................................75

Annex I (informative) Refrigerant enthalpy test method ............................................................................................................76

Annex J (informative) Outdoor air enthalpy test method ............................................................................................................78

Annex K (informative) Indoor calorimeter confirmative test method ...........................................................................81

Annex L (informative) Outdoor calorimeter confirmative test method .......................................................................83

Annex M (informative) Balanced-type calorimeter confirmative test method .....................................................85

Annex N (informative) Cooling condensate measurements ......................................................................................................86

Annex O (normative) Supplemental requirements when rating fan-less (coil only) type units .........87

Annex P (informative) Pictorial examples of the heating capacity test procedures given in 7.1 ........90

Bibliography .............................................................................................................................................................................................................................97

© ISO 2017 – All rights reserved v
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ISO 15042:2017(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 voluntary nature of standards, 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: w w w . i s o .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 second edition cancels and replaces the first edition (ISO 15042:2011), which has been technically

revised.
vi © ISO 2017 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 15042:2017(E)
Multiple split-system air conditioners and air-to-air heat
pumps — Testing and rating for performance
1 Scope

This document specifies the 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:

― basic multi-split systems, modular multi-split systems and modular heat recovery multi-split

systems. These multi-split systems include air-to-air systems with non-ducted and/or ducted

indoor units with integral fans and indoor units supplied without fans.
This document is limited to:

― residential, commercial and industrial split-system air conditioners and heat pumps;

― factory-made, electrically driven and use mechanical compression;

― single- and multiple-circuit split-systems which utilize one or more compressors with no more

than two steps of control of the outdoor unit;

― split-systems with a single refrigeration circuit which utilize one or more variable-speed

compressors or alternative compressor combinations for varying the capacity of the system by

three or more steps.

These split-systems are designed to operate with a combination of one or more outdoor units and

two or more indoor units designed for individual operation, and such modular systems are capable of

transferring recovered heat from one or more indoor units to other units in the same system.

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-cooled or water source equipment;
b) mobile (single-duct) units having a condenser exhaust duct;
c) individual assemblies not constituting a complete refrigeration system;
d) equipment using the absorption refrigeration cycle.

e) 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);

f) multiple split-system utilizing one or more refrigeration systems, one outdoor unit and one or more

indoor units, controlled by a single thermostat/controller (refer to ISO 5151 or ISO 13253).

© ISO 2017 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO 15042:2017(E)

This document does not cover the determination of seasonal efficiencies or seasonal part-load

performances, 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 “multi-split air conditioners”

and/or “multi-split 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.

ISO 817, Refrigerants — Designation and safety classification

ISO 5151, Non-ducted air conditioners and heat pumps — Testing and rating for performance

ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in

me a s ur ement (GUM: 1995)
3 Terms and definitions
For the purposes of this document, the following 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
...

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