ISO 5151:2017

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

ISO 5151:2017 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. ISO 5151:2017 is applicable to the following equipment: - non-ducted air-cooled air conditioners and non-ducted air-to-air heat pumps; or - ducted air conditioners and/or ducted heat pumps rated at less than 8 kW and intended to operate at an external static pressure of less than 25 Pa. ISO 5151:2017 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; - 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. ISO 5151:2017 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 (follow ISO 15042 for the 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) ducted equipment except for those specified in this clause (follow ISO 13253 for the testing of such equipment). ISO 5151:2017 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".

Climatiseurs et pompes à chaleur non raccordés — Essais et détermination des caractéristiques de performance

General Information

• Status: Published
• Publication Date: 20-Jul-2017
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• ICS: 27.080 - Heat pumps
• Technical Committee: ISO/TC 86/SC 6 - Testing and rating of air-conditioners and heat pumps
• Drafting Committee: ISO/TC 86/SC 6/WG 1 - Air-source air-conditioners and heat pumps
• Current Stage: 9093 - International Standard confirmed
• Start Date: 13-Dec-2022
• Completion Date: 13-Dec-2025

Relations

• Amended By: ISO 5151:2017/Amd 1:2020 - Non-ducted air conditioners and heat pumps — Testing and rating for performance — Amendment 1
• Effective Date: 07-Aug-2021
• Revises: ISO 5151:2010 - Non-ducted air conditioners and heat pumps — Testing and rating for performance
• Effective Date: 19-Jan-2013

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5151
Third edition
2017-07
Non-ducted air conditioners and
heat pumps — Testing and rating for
performance
Climatiseurs et pompes à chaleur non raccordés — Essais et
détermination des caractéristiques de performance
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
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Tel. [phone]
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 6
5 Cooling tests . 8
5.1 Cooling capacity test . 8
5.1.1 General conditions . 8
5.1.2 Temperature conditions . 8
5.1.3 Airflow conditions . 9
5.1.4 Test conditions.10
5.2 Maximum cooling performance test.11
5.2.1 General conditions .11
5.2.2 Temperature conditions .11
5.2.3 Airflow conditions .11
5.2.4 Test conditions.11
5.2.5 Performance requirements .12
5.3 Minimum cooling, freeze-up air blockage and freeze-up drip performance tests .13
5.3.1 General conditions .13
5.3.2 Temperature conditions .13
5.3.3 Airflow conditions .13
5.3.4 Test conditions.13
5.3.5 Performance requirements .13
5.4 Freeze-up drip performance test .14
5.4.1 General conditions .14
5.4.2 Temperature conditions .14
5.4.3 Airflow conditions .14
5.4.4 Performance requirements .15
5.5 Condensate control and enclosure sweat performance test .15
5.5.1 General conditions .15
5.5.2 Temperature conditions .15
5.5.3 Airflow conditions .15
5.5.4 Test conditions.15
5.5.5 Performance requirements .15
6 Heating tests.16
6.1 Heating capacity tests .16
6.1.1 General conditions .16
6.1.2 Temperature conditions .17
6.1.3 Airflow conditions .17
6.1.4 Defrost operation .18
6.1.5 Test procedure — General .18
6.1.6 Preconditioning period .18
6.1.7 Equilibrium period . . .18
6.1.8 Data collection period .18
6.1.9 Test procedure when a defrost cycle (whether automatically or manually
initiated) ends the preconditioning period .19
6.1.10 Test procedure when a defrost cycle does not end the preconditioning period .19
6.1.11 Test procedure for transient tests .20
6.1.12 Heating capacity test results . .21
6.2 Maximum heating performance test .21
6.2.1 General conditions .21
6.2.2 Temperature conditions .21
6.2.3 Airflow conditions .22
6.2.4 Test conditions.22
6.3 Minimum heating performance test .22
6.3.1 General conditions .22
6.3.2 Temperature conditions .22
6.3.3 Airflow conditions .23
6.3.4 Test condition .23
6.3.5 Performance requirements .23
6.4 Automatic defrost performance test .23
6.4.1 General conditions .23
6.4.2 Temperature conditions .23
6.4.3 Airflow conditions .23
6.4.4 Test conditions.24
6.4.5 Performance requirements .24
7 Test methods and uncertainties of measurements .24
7.1 Test methods .24
7.1.1 General.24
7.1.2 Calorimeter test method .24
7.1.3 Indoor air enthalpy test method .24
7.1.4 Capacity tests .25
7.2 Uncertainties of measurement .25
7.3 Test tolerances for steady-state cooling and heating tests .26
7.4 Test tolerances for performance tests .27
8 Test results .27
8.1 Capacity results .27
8.1.1 General.27
8.1.2 Adjustments .27
8.1.3 Cooling capacity calculations .28
8.1.4 Heating capacity calculations .28
8.2 Data to be recorded .29
8.3 Test report .29
8.3.1 General information .29
8.3.2 Capacity tests .31
8.3.3 Performance tests .31
9 Marking provisions .32
9.1 Nameplate requirements .32
9.2 Nameplate information .32
9.3 Split systems .32
10 Publication of ratings .33
10.1 Standard ratings .33
10.2 Other ratings .33
Annex A (normative) Test requirements .34
Annex B (informative) Airflow measurement .36
Annex C (normative) Calorimeter test method .42
Annex D (normative) Indoor air enthalpy test method .50
Annex E (informative) Refrigerant enthalpy test method .56
Annex F (informative) Outdoor air enthalpy test method .58
Annex G (informative) Indoor calorimeter confirmative test method .61
Annex H (informative) Outdoor calorimeter confirmative test method .63
Annex I (informative) Balanced-type calorimeter confirmative test method .65
Annex J (informative) Cooling condensate measurements .66
iv © ISO 2017 – All rights reserved

Annex K (informative) Pictorial examples of the heating capacity test procedures given in 6.1 .67
Bibliography .74
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 third edition cancels and replaces the second edition (ISO 5151:2010), which has been technically
revised.
vi © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 5151:2017(E)
Non-ducted air conditioners and 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:
— non-ducted air-cooled air conditioners and non-ducted air-to-air heat pumps; or
— ducted air conditioners and/or ducted heat pumps rated at less than 8 kW and intended to operate
at an external static pressure of less than 25 Pa.
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;
— 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 (follow ISO 15042 for the 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) ducted equipment except for those specified in this clause (follow ISO 13253 for the testing of such
equipment).
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.
ISO 817, Refrigerants — Designation and safety classification
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 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
non-ducted air conditioner
encased assembly or assemblies, designed primarily to provide free delivery of conditioned air to an
enclosed space, room or zone
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.
Note 2 to entry: An enclosed space, room or zone is known as a conditioned space.
3.2
non-ducted heat pump
encased assembly or assemblies designed primarily to provide free delivery of conditioned air to an
enclosed space, room or zone and includes 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.
Note 2 to entry: An enclosed space, room or zone is known as a conditioned space.
3.3
standard air
dry air at 20 °C and at a standard barometric pressure of 101,325 kPa, having a mass density of
1,204 kg/m
3.4
indoor discharge airflow
rate of flow of air from the outlet of the equipment into the conditioned space
Note 1 to entry: See Figure 1.
3.5
indoor intake airflow
rate of flow of air into the equipment from the conditioned space
Note 1 to entry: See Figure 1.
3.6
ventilation airflow
rate of flow of air introduced to the conditioned space through the equipment
Note 1 to entry: See Figure 1.
2 © ISO 2017 – All rights reserved

3.7
outdoor discharge airflow
discharge rate of flow of air from the equipment
Note 1 to entry: See Figure 1.
3.8
intake outdoor airflow
rate of flow of air into the equipment from the outdoor-side
Note 1 to entry: See Figure 1.
3.9
exhaust airflow
rate of flow of air from the indoor-side through the equipment to the outdoor-side
Note 1 to entry: See Figure 1.
3.10
leakage airflow
rate of flow of air interchanged between the indoor-side and outdoor-side through the equipment as a
result of its construction features and sealing techniques
Note 1 to entry: See Figure 1.
Note 2 to entry: This is not applicable for split system products.
3.11
bypassed indoor airflow
rate of flow of conditioned air directly from the indoor-side outlet to the indoor-side inlet of the
equipment
Note 1 to entry: See Figure 1.
3.12
bypassed outdoor airflow
rate of flow of air directly from the outdoor-side outlet to the outdoor-side inlet of the equipment
Note 1 to entry: See Figure 1.
3.13
equalizer opening airflow
rate of flow of air through the equalizer opening in the partition wall of a calorimeter
Note 1 to entry: See Figure 1.
3.14
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.
3.15
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.
3.16
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.
3.17
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.
3.18
sensible heat ratio
SHR
ratio of the sensible cooling capacity to the total cooling capacity
3.19
rated voltage
voltage shown on the nameplate of the equipment
3.20
rated frequency
frequency shown on the nameplate of the equipment
3.21
energy efficiency ratio
EER
ratio of the total cooling capacity to the effective power input 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/watt.
3.22
coefficient of performance
COP
ratio of the heating capacity to the effective power input 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/watt.
3.23
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.
3.24
effective power input
P
E
average electrical power input to the equipment obtained from
— the power input from the compressor(s),
— the power input to electric heating devices used only for defrosting,
4 © ISO 2017 – All rights reserved

— the power input to all control and safety devices of the equipment, and
— the power input for operation of all fans
Note 1 to entry: Effective power input is expressed in units of watts.
3.25
full-load operation
operation with the equipment and controls configured for the maximum continuous duty refrigeration
capacity specified by the manufacturer and allowed by the unit controls
Note 1 to entry: Unless otherwise regulated by the automatic controls of the equipment, all indoor units and
compressors operate during full-load operations.
Key
1 outdoor-side 7 equalizer opening
2 outdoor discharge 8 indoor intake
3 exhaust 9 ventilation
4 leakage 10 bypassed indoor
5 bypassed outdoor 11 indoor discharge
6 outdoor intake 12 indoor-side
NOTE Airflow diagram illustrating the definitions given in 3.4 to 3.13
Figure 1 — Airflow diagram
4 Symbols
Symbol Description Unit
A coefficient, heat leakage J/(s·K)
l
A area, nozzle m
n
a
C nozzle discharge coefficient
d
b b
c specific heat of moist air entering indoor-side J/(kg ⋅K)
pa1
b b
c specific heat of moist air leaving indoor-side J/(kg ⋅K)
pa2
b b
c specific heat of moist air entering outdoor-side J/(kg ⋅K)
pa3
b b
c specific heat of moist air leaving outdoor-side J/(kg ⋅K)
pa4
b
c specific heat of water J/(kg ⋅K)
pw
D nozzle throat diameter m
n
D outside diameter of refrigerant tube m
t
b
h specific enthalpy of air entering indoor-side J/kg
a1
b
h specific enthalpy of air leaving indoor-side J/kg
a2
b
h specific enthalpy of air entering outdoor-side J/kg
a3
b
h specific enthalpy of air leaving outdoor-side J/kg
a4
h specific enthalpy of refrigerant liquid entering expansion device J/kg
f1
h specific enthalpy of refrigerant liquid leaving condenser J/kg
f2
h specific enthalpy of refrigerant vapour entering compressor J/kg
g1
h specific enthalpy of refrigerant vapour leaving compressor J/kg
g2
h specific enthalpy of refrigerant entering indoor-side J/kg
r1
h specific enthalpy of refrigerant leaving indoor-side J/kg
r2
h specific enthalpy of water or steam supplied to indoor side test chamber J/kg
w1
h specific enthalpy of condensed moisture leaving indoor side test chamber J/kg
w2
h specific enthalpy of condensed moisture leaving outdoor-side test chamber J/kg
w3
h specific enthalpy of the water supplied to the outdoor side test chamber J/kg
w4
h specific enthalpy of the condensed water (in the case of H1 test condition) and the J/kg
w5
frost, respectively (in the case of H2 or H3 test conditions) in the test unit
K latent heat of vaporization of water (2 460 × 10 J/kg at 15 °C) J/kg
L length of refrigerant line m
p barometric pressure kPa
a
p test chamber equalization pressure Pa
c
p absolute pressure at nozzle throat Pa
n
p velocity pressure at nozzle throat or static pressure difference across nozzle Pa
v
P power input, indoor-side data W
i
P power input to compressor W
K
P total power input to equipment W
t
q air mass flow rate kg/s
m
q refrigerant flow rate kg/s
r
q refrigerant and oil mixture flow rate kg/s
ro
q air volume flow rate m /s
v
q air volume flow rate, indoor-side m /s
vi
a
Dimensionless value.
b
It means the mass of dry air; the mass, kg, of denominator in this unit is based on dry air (or DA). For units practically
used in the air conditioning field, “kg (DA)” is very often used for denominator. Example: J/kg(DA), m /kg (DA), kg/kg (DA)
NOTE  All parameters are in relation to the unit being tested unless specified otherwise.
6 © ISO 2017 – All rights reserved

Symbol Description Unit
q air volume flow rate, outdoor-side m /s
vo
q condenser water flow rate kg/s
w
q rate at which water vapour is condensed by the equipment kg/s
wc
q water mass flow supplied to the outside test chamber for maintaining the test kg/s
wo
conditions
a
Re Reynolds number
T thickness of tubing insulation m
t temperature, ambient of compressor calorimeter °C
a
t temperature of air entering indoor-side, dry bulb °C
a1
t temperature of air leaving indoor-side, dry bulb °C
a2
t temperature of air entering outdoor-side, dry bulb °C
a3
t temperature of air leaving outdoor-side, dry bulb °C
a4
t temperature of surface of condenser of the compressor calorimeter °C
c
t temperature of surface of evaporator of the compressor calorimeter °C
e
t temperature of water entering condenser of the compressor calorimeter °C
w1
t temperature of water leaving condenser of the compressor calorimeter °C
w2
v velocity of air, at nozzle m/s
a
b 3 b
v specific volume of dry air portion of mixture at nozzle m /kg
n
v′ specific volume of air-water vapour mixture at nozzle m /kg
n
W mass of cylinder and bleeder assembly, empty g
W mass of cylinder and bleeder assembly, with sample g
W mass of cylinder and bleeder assembly, with oil from sample g
b b
W specific humidity of air entering indoor-side kg/kg
i1
b b
W specific humidity of air leaving indoor-side kg/kg
i2
b b
W specific humidity at nozzle inlet kg/kg
n
W water vapour (rate) condensed kg/s
r
a
X concentration of oil to refrigerant-oil mixture
o
a
X mass ratio, refrigerant to refrigerant-oil mixture
r
a
Y expansion factor
α Interconnecting tubing heat transfer coefficient W/(m ·K)
a
λ thermal conductivity W/(m·K)
ν kinematic viscosity of air m /s
∑P other power input to the indoor-side test chamber (e.g. illumination, electrical W
ic
and thermal power input to the compensating device, heat balance of the
humidification device)
∑P sum of all total power input to the outdoor-side test chamber, not including W
oc
power to the equipment under test
ϕ heat removed by cooling coil in the outdoor-side test chamber W
c
ϕ heat removed by cooling coil in the indoor side test chamber W
ci
ϕ latent cooling capacity (dehumidifying) W
d
ϕ heat input to evaporator of compressor calorimeter W
e
ϕ heating capacity, indoor-side test chamber W
hi
a
Dimensionless value.
b
It means the mass of dry air; the mass, kg, of denominator in this unit is based on dry air (or DA). For units practically
used in the air conditioning field, “kg (DA)” is very often used for denominator. Example: J/kg(DA), m /kg (DA), kg/kg (DA)
NOTE  All parameters are in relation to the unit being tested unless specified otherwise.
Symbol Description Unit
ϕ heating capacity, outdoor-side test chamber W
ho
ϕ heat leakage into indoor side test chamber through walls, floor and ceiling W
li
ϕ heat leakage out of outdoor side test chamber through walls, floor and ceiling W
lo
ϕ heat leakage into indoor-side test chamber through partition separating W
lp
indoor-side from outdoor-side
ϕ line heat loss in interconnecting tubing W
L
ϕ sensible cooling capacity, indoor side W
sci
ϕ refrigerating capacity of a refrigerant compressor W
tc
ϕ total cooling capacity, indoor-side W
tci
ϕ total cooling capacity, outdoor-side W
tco
ϕ total heating capacity, indoor-side W
thi
ϕ total heating capacity, outdoor-side W
tho
a
Dimensionless value.
b
It means the mass of dry air; the mass, kg, of denominator in this unit is based on dry air (or DA). For units practically
used in the air conditioning field, “kg (DA)” is very often used for denominator. Example: J/kg(DA), m /kg (DA), kg/kg (DA)
NOTE  All parameters are in relation to the unit being tested unless specified otherwise.
5 Cooling tests
5.1 Cooling capacity test
5.1.1 General conditions
5.1.1.1 All equipment within the scope of this document shall have the cooling capacities and energy
efficiency ratios determined in accordance with the provisions of this document and rated at the cooling
test conditions specified in Table 1. All tests shall be carried out in accordance with the requirements
of Annex A and the test methods specified in Clause 7. All tests shall be conducted with the equipment
functioning at full-load operation, as defined in 3.25. The electrical input values used for rating purposes
shall be measured during the cooling capacity test.
5.1.1.2 If the manufacturer of equipment having a variable-speed compressor does not provide
information on the full-load frequency and how to achieve it during a cooling capacity test, the equipment
shall be operated with its thermostat or controller set to its minimum allowable temperature setting.
5.1.2 Temperature conditions
5.1.2.1 The temperature conditions stated in Table 1 (columns T1, T2 and T3) shall be considered
standard rating conditions for the determination of cooling capacity. For equipment intended for space
cooling, testing shall be conducted at one or more of the standard rating conditions specified in Table 1.
5.1.2.2 Equipment manufactured only for use in a moderate climate similar to that specified in Table 1,
column T1, shall have ratings determined by tests conducted at T1 conditions and shall be designated as
type T1 equipment.
5.1.2.3 Equipment manufactured only for use in a cool climate similar to that specified in Table 1,
column T2, shall have ratings determined by tests conducted at T2 conditions and shall be designated as
type T2 equipment.
8 © ISO 2017 – All rights reserved

5.1.2.4 Equipment manufactured only for use in a hot climate similar to that specified in Table 1,
column T3, shall have ratings determined by tests conducted at T3 conditions and shall be designated as
type T3 equipment.
5.1.2.5 Equipment manufactured for use in more than one of the climates defined in Table 1 shall have
marked on the nameplate the designated type (T1, T2 and/or T3). The corresponding ratings shall be
determined by the standard rating conditions specified in Table 1.
5.1.3 Airflow conditions
5.1.3.1 Indoor-side air quantity — Air enthalpy test method
5.1.3.1.1 Tests shall be conducted at standard rating conditions (see Table 1) with 0 Pa static pressure
maintained at the air discharge of the equipment and with the refrigeration means in operation. All air
quantities shall be expressed as cubic metre per second (m /s) of standard air, as defined in 3.3.
When the fan speed is adjustable, the difference of the mass airflow rate from the standard air due to
low barometric pressure should be adjusted by the fan speed.
5.1.3.1.2 Airflow measurements should be made in accordance with the provisions specified in
Annex B, as appropriate, as well as the provisions established in other appropriate annexes of this
document.
NOTE Additional guidance for making airflow measurements can be found in ISO 3966 and ISO 5167-1.
Table 1 — Cooling capacity rating conditions
Standard rating conditions
Parameter
T1 T2 T3
Temperature of air entering indoor-side:
—  dry-bulb 27 °C 21 °C 29 °C
—  wet-bulb 19 °C 15 °C 19 °C
Temperature of air entering outdoor-side:
—  dry-bulb 35 °C 27 °C 46 °C
a
—  wet-bulb 24 °C 19 °C 24 °C
b
Test frequency Rated frequency
Test voltage See Table 2
NOTE
T1  Standard cooling capacity rating conditions for moderate climates.
T2  Standard cooling capacity rating conditions for cool climates.
T3  Standard cooling capacity rating conditions for hot climates.
a
The wet-bulb temperature condition shall only be required when testing air-cooled condensers which evaporate the
condensate.
b
Equipment with dual-rated frequencies shall be tested at each frequency.
Table 2 — Voltages for capacity and performance tests
a b
Rated (nameplate) voltage Test voltage
V V
90 to 109 100
110 to 127 115
180 to 207 200
208 to 253 230
254 to 341 265
342 to 420 400
421 to 506 460
507 to 633 575
a
For equipment with dual-rated voltages, such as 115/230 and 220/440, the test voltages would be 115 V and 230 V in the
first example, and 230 V and 460 V in the second example. For equipment with an extended voltage range, such as 110 V to
120 V or 220 V to 240 V, the test voltage would be 115 V or 230 V, respectively. Where the extended voltage range spans two
or more of the rated voltage ranges, the mean of the rated voltages shall be used to determine the test voltage from this table.
EXAMPLE  For equipment with an extended voltage range of 200 V to 220 V, the test voltage would be 230 V, based on the
mean voltage of 210 V.
b
The voltages in this table are for capacity and performance tests other than the maximum cooling and the maximum
heating performance tests.
5.1.3.2 Outdoor-side air quantity
If the outdoor airflow is adjustable, all tests shall be conducted at the outdoor-side air quantity or at the
fan control setting that is specified by the manufacturer. Where the fan is non-adjustable, all tests shall
be conducted at the outdoor-side air volume flow rate inherent in the equipment when operated with
the following in place: all of the resistance elements associated with inlets, louvers and any ductwork
and attachments considered by the manufacturer as normal installation practice. Once established,
the outdoor-side air circuit of the equipment shall remain unchanged throughout all tests prescribed
in this document, except to adjust for any change caused by the attachment of the airflow measuring
device when using the outdoor air enthalpy test method (see F.2.1).
5.1.4 Test conditions
5.1.4.1 Preconditions
5.1.4.1.1 Tests shall be conducted under the selected conditions with no changes made in fan speed or
system resistance to correct for variations from the standard barometric pressure (see 3.3).
5.1.4.1.2 Grille positions, damper positions, fan speeds, etc. shall be set in accordance with the
manufacturer’s instructions. In the absence of manufacturer’s instructions, the grilles, dampers, fan
speeds, etc. shall be set to provide maximum cooling capacity. When tests are carried out at other settings,
these settings shall be noted together with the cooling capacity ratings.
5.1.4.1.3 The
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