DRAFT KENYA STANDARD       DKS 2463: 2018  
ICS 23.120  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-ducted air conditioners — Testing and 
rating performance  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 © KEBS 2018                 Second  Edition 2018  
 DKS 2463: 2018  
 
ii                © KEBS 2018  — All rights reserved  TECHNICAL COMMITTEE REPRESENTATION  
 
The following organizations were represented on the Technical C ommittee.  
 
Energy Regulatory Commission  
Kenya Association of Manufacturers  
Ministry of Energy and Petroleum  
New edge Technologies Ltd . 
Consumer Information Network  
Intertek International Ltd.  
Energy Advisory  Ltd 
Rift Valley Railways/Kenya Railways Corporation  
Ozone Engineering  
Kenyatta University  
Kenya Industrial Research and Development  
Raerex  (EA) Ltd . 
HEVAC Kenya  
National Ozone Unit  
Apex Management C onsultant Ltd . 
Kenya Bureau of Standards — Secretariat  
 
 
 
 
 
 
 
REVISION OF KENYA STANDARDS  
 
In order to keep abreast of progress in industry, Kenya Standards shall be regularly reviewed. Suggestions for 
improvements to published standards, addressed to the Managing Director, Kenya Bureau of Standards, a re 
welcome.  
 
 
 
 
 
 
© Kenya Bureau of Standards, 2018  
 
Copyright.  Users are reminded that by virtue of Section 25 of the Copyright Act, Cap. 12 of 2001 of the Laws of Kenya, copyright subsists 
in all Kenya Standards and except as provided under Section 26 o f this Act, no Kenya Standard produced by Kenya Bureau of Standards 
may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing f rom the 
Managing Director.  
 
 
 DRAFT KENYA STAN DARD        DKS 2463 : 2018  
ICS 23.120  
© KEBS 2018  — All rights reserved     iii  
 
 
 
 
 
 
 
 
 
 
 
 
Non-ducted air cond itioners — Testing and 
rating performance  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254 020) 605490, 602350, Fax: (+254 020) 604031  
E-Mail: info@kebs.org,  Web:http://www.kebs.org   
 
Coast Re gion        Lake Region            Rift Valley Region  
P.O. Box 99376, Mombasa -80100    P.O. Box 2949, Kisumu -40100        P.O. Box 2138, Nakuru -20100  
Tel.: (+254 041) 229563, 230939/40          Tel.: (+254 057) 23549, 22396        Tel.: (+254 051) 210553, 210555  
Fax: (+254 041) 229448      Fax: (+254 057) 21814  
 
 DKS 2463: 2018  
 
iv                © KEBS 2018  — All rights reserved   Foreword  
 
This Kenya Standard was developed by the Technical Committee on Refrigeration and Air Conditioning under 
the guidance of Standards Project Committee and it is in accordance with the procedures of the  Kenya Bureau  
of Standards . 
 
During  the preparation of this s tandard, reference was made to  the following document : 
 
ISO 5 151, Non-ducted air conditioners and heat pumps — Testing and rating for performance  
 
Acknowledgement is hereby made for assistance derived from th is source . 
 
 
 
 
  
KENYA STANDARD                 DKS 2463: 2018  
 
 
© KEBS 2018  — All rights reserved                  1  
 
Non-ducted air conditioners — Testing and rating for performance  
 
 
1 Scope  and field of ap plication  
 
1.1 This Kenya  Standard specifies the standard conditions on which the ratings of single -package and split -
system non -ducted air conditioners employing air cooled condensers are based, and the test methods to be 
applied for determination of the various ratings.  
 
This standard is limited to systems utilizing a single refrigeration circuit and having one evaporator and one 
condenser.  
 
1.2 This standard also specifies the test conditions and the corresponding test procedures for determining 
variou s performance characteristics of these non -ducted air conditioners.  
 
1.3 It does not apply to the testing and rating of:  
 
a) combined air conditioners and heat pumps;  
 
b) multiple split -system1) air conditioners;  
 
c) units designed for use with additional ducting; or 
 
d) mobile (windowless) units having a condenser exhaust duct . 
 
e) precision cooling.  
 
1.4 Clause 4 of this standard covers the rating and testing conditions for non -ducted air conditioners.  
 
 
2 Normative references  
 
The following referenced documents are ind ispensable for the application of this standard. 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 number d esignation  
 
ISO 3966 , Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes  
 
ISO 5167 -1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross -
section conduits running full — Part 1: General p rinciples and requirements   
 
ISO/IEC Guide 98 -3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in 
measurement (GUM: 1995)  
 
3 Terms and definitions  
 
For the purposes of this standard, the following te rms and definitions shall a pply:   
 
                                                      
1) A unit having two or more indoor units connected to a single outdoor unit.  DKS 2463: 2018  
 
2                © KEBS 2018  — All rights reserved  NOTE  For the purposes of this Kenya Standard, the term "equipment" will be used to mean "non -ducted air conditioners”.  
 
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 mea ns 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 
standard  air 
dry air at 20.0 °C, and at a standard barometric pressure of 101 .325 kPa, having a mass density of 1 .204 kg/m3 
 
3.3 
energy  guide label  
label that specifies the required parameters related to produ ct energy use. It establishes product classes so 
that units within the same product class with similar features are compared by their energy use.  
 
NOTE  The definitions given in 3.4 to 3. 13 relating to airflow are illustrated in Figure 1.  
 
3.4 
indoor  discha rge air -flow 
rate of flow of air from the indoor -side outlet of the equipment into the conditioned space  
 
3.5 
indoor  intake air -flow 
rate of flow of air into the equipment from the conditioned space  
 
3.6 
ventilation  air-flow 
rate of flow of air introduced to the conditioned space through the equipment  
 
3.7 
outdoor  discharge air -flow 
discharge  rate of flow of air from the outdoor side of the equipment to the outdoors  
 
3.8 
outdoor  intake air -flow 
rate of flow of air into the equipment from the outdoor side  
 
3.9 
exhaust  air-flow 
rate of flow of air from the indoor side through the equipment to the outdoor side  
 
3.10  
leakage  air-flow 
rate of flow of air interchanged between the indoor side and outdoor side through the equipment as a result of 
its construction f eatures and sealing techniques  
 
3.11 
bypassed  indoor air -flow 
flow of conditioned air directly from the indoor -side outlet to the indoor -side inlet of the equipment  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  3  
3.12  
bypassed  outdoor air -flow 
flow of air directly from the outdoor -side outlet to the o utdoor -side inlet of the equipment  
 
3.13 
equalizer  opening air -flow 
rate of flow of air through the equalizer opening in the partition wall of a calorimeter  
 
 
Figure 1 — Air flow diagram illustrating definitions given in 3.4 to 3.13.  
 
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  
 
3.15 
latent  cooling capacity; room dehumidifying capacity  
amount of latent heat that the equipment can remove from the condi tioned space in a defined interval of time  
 
3.16 
sensible  cooling capacity  
amount  of sensible heat that the equipment can remove from the conditioned space in a defined interval of 
time 
 
3.17  
sensible  heat ratio  
ratio of the sensible cooling capacity to t he total cooling capacity  
 
3.18  
rated voltage(s)  
voltage (s) shown on the nameplate of the equipment  
DKS 2463: 2018  
 
4                © KEBS 2018  — All rights reserved   
3.19  
rated frequency(ies)  
frequency ( ies) shown on the nameplate of the equipment  
 
3.20  
Energy Efficiency Ratio (EER)  
ratio of the total cooling capacit y to the effective power input at any given set of rating conditions. (Where the 
EER is stated without an indication of units, it shall be understood that it is derived from watts/watt.)  
 
3.21  
effective  power input ( PE) 
average  electrical power input to t he equipment within a defined interval of time, obtained from:  
 
— the power input for operation of the compressor and any power input for defrosting, excluding 
additional electrical heating devices not used for de - frosting;  
 
— the power input of all contr ol and safety devices of the equipment; and  
 
— the power input of the conveying devices within the equipment for heat transport media (for example 
fan, pump).  
 
3.22 
total power input (Pt) 
power  input to all components of the equipment as delivered  
 
3.23 
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 cont rols of the equipment, all indoor units and 
compressors operate during full -load operations.  
 
4  Symbols  
 
Symbol  Description  Unit 
Al coefficient, heat leakage  J/(s·K)  
An area, nozzle  m2 
Cd nozzle discharge coefficient  a 
cpa1 specific heat of moist air  entering indoor -sideb  J/(kgb·K)  
cpa2 specific heat of moist air leaving indoor -sideb  J/(kgb·K)  
cpa3 specific heat of moist air entering outdoor -sideb  J/(kgb·K)  
cpa4 specific heat of moist air leaving outdoor -sideb  J/(kgb·K)  
cpw specific heat of water  J/(kgb·K)  
Dn nozzle throat diameter  m 
Dt outside diameter of refrigerant tube  m 
ha1 specific enthalpy of air entering indoor -side J/kgb  
ha2 specific enthalpy of air leaving indoor -side J/kgb  
ha3 specific enthalpy of air entering outdoor -side J/kgb  
ha4 specific enthalpy of air leaving outdoor -side J/kgb  
hf1 specific enthalpy of refrigerant liquid entering expansion 
device  J/kg DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  5 hf2 specific enthalpy of refrigerant liquid leaving condenser  J/kg 
hg1 specific enthalpy of refrigerant vapour entering comp ressor  J/kg 
hg2 specific enthalpy of refrigerant vapour leaving compressor  J/kg 
hr1 specific enthalpy of refrigerant entering indoor -side J/kg 
hr2 specific enthalpy of refrigerant leaving indoor -side J/kg 
hw1 specific enthalpy of water or steam supplie d to indoor side 
test chamber  J/kg 
hw2 specific enthalpy of condensed moisture leaving indoor side 
test chamber  J/kg 
hw3 specific enthalpy of condensed moisture leaving outdoor -side 
test chamber  J/kg 
hw4 specific enthalpy of the water supplied to the ou tdoor side test 
chamber  J/kg 
hw5 specific enthalpy of the condensed water (in the case of H1 
test condition) and the frost, respectively (in the case of H2 or 
H3 test conditions) in the test unit  J/kg 
K1 latent heat of vaporization of water (2460×103 J/k g at 15°C)  J/kg 
L length of refrigerant line  m 
pa barometric pressure  kPa 
pc test chamber equalization pressure  Pa 
pn absolute pressure at nozzle throat  Pa 
pv velocity pressure at nozzle throat or static pressure difference 
across nozzle  Pa 
Pi power input, indoor -side data  W 
PK power input to compressor  W 
Pt total power input to equipment  W 
qm air mass flow rate  kg/s 
qr refrigerant flow rate  kg/s 
qro refrigerant and oil mixture flow rate  kg/s 
qv air volume flow rate  m3/s  
qvi air volume flow rat e, indoor -side m3/s  
qvo air volume flow rate, outdoor -side m3/s  
qw condenser water flow rate  kg/s 
qwc rate at which water vapour is condensed by the equipment  kg/s 
qwo water mass flow supplied to the outside test chamber for 
maintaining the test condit ions kg/s 
Re Reynolds number  a 
T thickness of tubing insulation  m 
ta temperature, ambient of compressor calorimeter  ‹C 
ta1 temperature of air entering indoor -side, dry bulb  ‹C 
ta2 temperature of air leaving indoor -side, dry bulb  ‹C 
ta3 temperature  of air entering outdoor -side, dry bulb  ‹C 
ta4 temperature of air leaving outdoor -side, dry bulb  ‹C 
tc temperature of surface of condenser of the compressor 
calorimeter  ‹C 
te temperature of surface of evaporator of the compressor 
calorimeter  ‹C 
tw1 temperature of water entering condenser of the compressor 
calorimeter  ‹C DKS 2463: 2018  
 
6                © KEBS 2018  — All rights reserved  tw2 temperature of water leaving condenser of the compressor 
calorimeter  ‹C 
va velocity of air, at nozzle  m/s 
vn specific volume of dry air portion of mixture at nozzleb  m3/kgb  
vŒn specific volume of air -water vapour mixture at nozzle  m3/kg  
W1 mass of cylinder and bleeder assembly, empty  g 
W3 mass of cylinder and bleeder assembly, with sample  g 
W5 mass of cylinder and bleeder assembly, with oil from sample  g 
Wi1 specific hu midity of air entering indoor -sideb  kg/kgb  
Wi2 specific humidity of air leaving indoor -sideb  kg/kgb  
Wn specific humidity at nozzle inletb  kg/kgb  
Wr water vapour (rate) condensed  kg/s 
Xo concentration of oil to refrigerant -oil mixture  a 
Xr mass ratio, refrigerant to refrigerant -oil mixture  a 
Y expansion factor  a 
αa Interconnecting tubing heat transfer coefficient  W/(m2 EK) 
λ thermal conductivity  W/(m EK) 
ν kinematic viscosity of air  m2/s  
ƩPic other power input to the indoor -side test chamber  (e.g. 
illumination, electrical and thermal power input to the 
compensati ng device, heat balance of the humidification 
device)  W 
ƩPoc sum of all total power input to the outdoor -side test chamber, 
not including power to the equipment under test  W 
ϕc heat remove d by cooling coil in the outdoor -side test chamber  W 
ϕci heat removed by cooling coil in the indoor side test chamber  W 
ϕd latent cooling capacity (dehumidifying)  W 
ϕe heat input to evaporator of compressor calorimeter  W 
ϕhi heating capacity, indoor -side test chamber  W 
ϕho heating capacity, outdoor -side test chamber  W 
ϕli heat leakage into indoor side test chamber through walls, 
floor and ceiling  W 
ϕlo heat leakage out of outdoor side test chamber through walls, 
floor and ceiling  W 
ϕlp heat leakage into indoor -side test chambe r through partition 
separating indoor -side from outdoor -side W 
ϕL line heat loss in interconnecting tubing  W 
ϕsci sensible cooling capacity, indoor side  W 
ϕtc refrigerating capacity of a refrigerant compressor  W 
ϕtci total c ooling capacity, indoor -side W 
Φtco  total cooling capacity, outdoor -side W 
ϕthi total heating capacity, indoor -side W 
ϕtho total heating capacity, outdoor -side W DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  7 a  Dimensionless value.  
b  It means the mass of dry air; the mass, kg, of denominator in t his 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 3/kg (DA), kg/kg (DA)  
NOTE  All parameters are in relation to the unit being tested unless spe cified 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 3.23. 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 fre quency 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 shall be considered standard rating conditions for the 
determination of cooling capacity. For equipment intended for space cooling, testing shall be conducted at 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.  
 
5.1.3  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 3/s) of stand ard air, as defined in 3.2. 
 
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 prov isions 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. 
  DKS 2463: 2018  
 
8                © KEBS 2018  — All rights reserved  Table 1  — Cooling capacit y rating conditions  
 
 
Table 2 — Voltages for capac ity and performance tests  
 
Rated (nameplate) voltage  
 Test voltage  
208 to 253  
 230 
342 to 420  
 400 
 
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 a ssociated 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 d ocument, 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  
 Parameter  Standard rating conditions  
T1 
Temperature of air entering indoor -side   
— dry – bulb 
 
— wet – bulb  27 ˚ C 
19 ˚C 
Temperature of air entering Outdoor -side   
— dry – bulb 
 
— wet – bulba  35 ˚C 
24  ˚C 
Test Frequency  50 hz  
Test voltage  See Table 2  
NOTE  
T1  Standard cooling capacity rating conditions for moderate climates.  
a  The wet -bulb temperature condition shall only be required when testing air -cooled condensers 
which evaporate the condensate.  
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  9 5.1.4.1.1  Tests shall be conducted under the selec ted 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 manufacture r’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 test room reconditioning apparatus and the equipment under test shall be operated until 
equilibrium conditions, as required by 6.3, are attained. Equilibrium conditions shall be maintained for not less 
than 1 h before capac ity test data are recorded.  
 
5.1.4.2  Testing requirements  
 
The test shall provide for the determination of the sensible, latent and total cooling capacities as determined 
in the indoor -side test chamber.  
 
5.1.4.3  Duration of test  
 
The data shall be record ed at equal intervals as required by 6.3.3. The recording of the data shall continue for 
at least a 30 -min period during which the tolerances specified in 6.3 shall be met.  
 
5.2 Maximum cooling performance test  
 
5.2.1  General conditions  
 
The test shall be conducted with the equipment functioning at full -load operation, as defined in 3.25. The test 
voltages in Table 3 shall be maintained at the specified percentages under running conditions. In addition, the 
test voltage shall be adjusted so that it is not l ess than 86 % of the rated voltage at the moment of restarting 
the equipment after the shutdown required by 5.2.4.2 . The determination of cooling capacity and electrical 
power input is not required for this performance test.  
 
5.2.2  Temperature conditions  
 
The conditions, which shall be used during the maximum cooling, are given in Table 3 . 
  DKS 2463: 2018  
 
10                © KEBS 2018  — All rights reserved   
Table 3 — Maximum cooling performance test conditions  
 
5.2.3  Airflow conditions  
 
The maximum cooling performance t est shall be conducted with an indoor -side fan speed setting as 
determined under 5.1.4.1.2 . 
 
5.2.4  Test conditions  
 
5.2.4.1  Preconditions  
 
The controls of the equipment shall be set for maximum cooling and, if provided, all ventilating air dampers 
and exha ust air dampers shall be closed.  
 
5.2.4.2  Duration of test  
 
The equipment shall be operated continuously for 1 h after the specified air temperatures in Table 3  have been 
established in accordance with the tolerances in Table 8. Thereafter, all power to t he equipment shall be cut 
off for 3 min and then restored. The operation of the equipment may be restarted either automatically or through 
the use of a remote controller or similar device. The test shall continue for 60 min after the equipment restarts.  
 
5.2.5 Performance requirements  
 
5.2.5.1  Air conditioners  shall meet the following requirements when operating at the conditions specified in 
Table 3 : 
 Parameter  Standard rating conditions  
T1 
Temperature of air entering indoor -side   
-dry – bulb 
-wet – bulb  32 ˚C 
23  ˚C 
Temperature of air entering outdoor-side   
-dry – bulb 
-wet – bulba  43 ˚C 
26  ˚C 
Test Frequency  50 hz  
Test voltage  a) 90 % and 110 % of rated voltage with a single 
nameplate rating;  
 
b) 90 % of the lower rated voltage and 110 % of 
the higher  rated voltage for units with a dual or 
extended nameplate voltage . 
a The wet -bulb temperature condition shall only be required when testing air -cooled condensers that evaporate 
the condensate . DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  11 a) during one entire test, the equipment shall operate without any indication of damage;  
 
b) the motors of  the equipment shall operate continuously for the first hour of the test without tripping any 
protective device;  
 
c) after the interruption of power, the equipment shall resume operation within 30 min and run continuously 
for 1 h, except as specified in 5.2.5.2  and 5.2.5.3.  
 
 
 
 
Key 
1  Power supply to equipment unit on  
2  Power supply to equipment off  
3  Official test period begins  
4  Power supply to equipment turned off  
5 Power supply to equipment turned back on  
6  Maximum time before equipment resumes con tinuous operation  
7  End of test, if equipment restarted upon re -energization of power  
8  End of test, if equipment utilized full 30 min for protective device to reset  
a  30 min, steady -state operation.  
b  60 min, continuous operation running at reduced or  increased supply voltage.  
c  3 min, power off.  
d  5 min, in which a protective device may trip.  
e  30 min.  
f, g 60 min of continuous operation after equipment restarts.  
 
Figure 1 — Maximum performance test operation  
5.2.5.2  A protective device may trip on ly during the first 5 min of operation after the shutdown period of 3 
min. During the remainder of that 1 h test period, no protective device shall trip.  
 
5.2.5.3  For those models so designed that resumption of operation does not occur after the initial tr ip within 
the first 5 min, the equipment may remain out of operation for not longer than 30 min. It shall then operate 
continuously for 1 h.  
 
5.3 Minimum cooling, freeze -up air blockage and freeze -up drip performance tests  
 
5.3.1  General conditions  
DKS 2463: 2018  
 
12                © KEBS 2018  — All rights reserved   
The t est conditions specified in Table 4  shall be used when conducting the minimum cooling, freeze -up air 
blockage and freeze -up drip performance tests. The tests shall be conducted with the equipment functioning 
at full -load operation, as defined in 3.25, exce pt as required in 5.3.3.  The determination of cooling capacity 
and electrical power input is not required for these performance tests.  
 
5.3.2  Temperature conditions  
 
Tests shall be carried out under the temperature conditions established in Table 4.  
 
5.3.3  Airflow conditions  
 
The controls, fan speeds, dampers and grilles of the equipment shall be set to maximize the tendency to 
produce frost or ice on the evaporator, provided such settings are not contrary to the manufacturer’s operating 
instructions.  
 
5.3.4 Test conditions  
 
5.3.4.1  Preconditions  
 
The equipment shall be started and operated until the operating conditions have stabilized.  
 
5.3.4.2  Duration of test  
 
After the operating conditions given in Table 4  have stabilized in accordance with the toleranc es in Table 8, 
the equipment shall be operated for a period of 4 h. The equipment shall be permitted to stop and start under 
the control of an automatic limit device, if provided.  
 
Table 4 — Minimum cooling, freeze -up air blockage and freeze -up drip perfo rmance test 
conditions  
 
 
 
5.3.5  Performance requirements  
 Parameter  Standard test conditions  
 
T1 
Temperature of air entering indoor -side   
-dry – bulb 
-wet – bulb  21 ˚C 
15  ˚C 
Temperature of air entering Outdoor -side   
-dry – bulb 
-wet – bulb  21 ˚C 
— 
Test Frequency  50 hz  
Test v oltage  See Table 2  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  13 5.3.5.1  The equipment shall operate under the conditions specified without any indication of damage.  
 
5.3.5.2  At the end of the 4 -h test, any accumulation of frost or ice on the indoor coil shall not co ver more than 
50 % of the indoor -side face area of the indoor coil or reduce the airflow rate by more than 25 % of the initial 
airflow rate. [If measuring indoor air volume rate using a test apparatus that includes an exhaust fan (as in 
Figure B.1), the op erating speed of the exhaust fan and/or the position of an in -line flow damper shall be 
controlled to maintain zero static pressure during the 4 -h test.] If the equipment and test apparatus do not allow 
for visual observation of the indoor coil and if the indoor air volume rate is not measured, then the requirements 
of 5.3.5.3  shall be met.  
 
5.3.5.3  During the 4 -h test period, the midpoint temperature of every indoor coil circuit or the refrigerant 
suction pressure shall be measured at equal intervals that span 1 min or less. The measurement(s) carried 
out 10 min after beginning the 4 -h test shall be defined as the initial value(s). If the suction pressure is 
measured, it shall be used to calculate the saturated suction temperature.  
 
a)  If the compressor(s)  do(es) not cycle OFF on automatic controls during the test, and  
 
i) if coil circuit temperatures are measured, the temperatures shall not remain more than 2 K below the 
corresponding initial value for each circuit for more than 20 consecutive min, or  
 
ii) if suction pressure is measured, the saturated suction temperature shall not remain more than 2 K 
below the initial value for more than 20 consecutive min.  
 
b)  If the compressor(s) cycle(s) ON/OFF on automatic controls during the test, and  
 
i) if coil ci rcuit temperatures are measured, the individual circuit temperatures measured 10 min after 
the beginning of any ON cycle during the test shall not be more than 2 K below the corresponding initial 
circuit temperature(s), or  
 
ii) if suction pressure is measu red, the saturated suction temperature measured 10 min after the 
beginning of any ON cycle during the test shall not be more than 2 K below the initial saturated suction 
temperature.  
 
5.4 Freeze -up drip performance test  
 
5.4.1  General conditions  
 
The freez e-up drip performance test shall be run immediately after completion of the minimum cooling and 
freeze -up air blockage performance tests and at the conditions specified in Table 4 . The test shall be conducted 
with the equipment functioning at full -load ope ration, as defined in 3.25,  except as required in 5.4.3.  The 
determination of capacity and electrical power is not required for this performance test.  
 
5.4.2  Temperature conditions  
 
The temperature conditions for the freeze -up drip performance test are giv en in Table 4 . 
 
5.4.3  Airflow conditions  
 
The air inlet to the indoor coil shall be covered to completely block the passage of air, so as to attempt to 
achieve complete blockage of the evaporator by frost or ice.  
 
5.4.3.1  Preconditions  
 
The equipment shall  be started and operated until the operating conditions given in Table 4  have stabilized in 
accordance with the tolerances in Table 8. 
 
5.4.3.2  Duration of test  
After the operating conditions have stabilized, the equipment shall be operated for a period o f 4 h. The 
equipment shall be permitted to stop and start under the control of an automatic limit device, if provided. At the DKS 2463: 2018  
 
14                © KEBS 2018  — All rights reserved  end of the 4 -h test, the equipment shall be stopped and the air inlet covering removed until the accumulation 
of frost or ice has melted. The equipment shall then be turned on with the fan(s) operating at the highest speed 
for 5 min.  
 
5.4.4  Performance requirements  
 
During the test, no ice shall drip from the coil and no water shall drip or blow off the equipment on the indoor -
side.  
 
5.5 Condensate control and enclosure sweat performance test  
 
5.5.1  General conditions  
 
The conditions which shall be used during the condensate control and enclosure sweat test are given in Table 
5. The test shall be conducted with the equipment functioni ng at full -load operation, as defined in 3.25,  except 
as required in 5.5.3 . The determination of cooling capacity and electrical power input is not required for this 
performance test.  
 
5.5.2  Temperature conditions  
 
The temperature conditions which shall be  used during this test are given in Table 5.  
 
Table 5 — Condensate control and enclosure sweat performance test conditions  
 
 
5.5.3  Airflow conditions  
 
The controls, fans, dampers and grilles of the equipment shall be set to produce the maximum tendency to 
sweat, provided such settings are not contrary to the manufacturer’s operating instructions.  
 
 
5.5.4  Test conditions  
 Parameter  Standard test conditions  
 
T1 
Temperature of air entering indoor -side   
-dry – bulb 
-wet – bulb  27 ˚C 
24  ˚C 
Temperature of air entering Outdoor -side   
-dry – bulb 
-wet – bulba 27 ˚C 
24 ˚C 
Test Frequency  50 hz  
Test voltage  See Table 2  
a    The wet -bulb temperature condition shall only be required when testing air -cooled condensers that 
evaporate t he condensate.  
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  15 5.5.4.1  Preconditions  
 
After establishment of the specified temperature conditions, the equipment shall be started with its condensate 
collection pan filled to the overflowing point and the equipment shall be run until the condensate flow has 
become uniform.  
 
5.5.4.2  Duration of test  
 
The equipment shall be operated for a period of 4 h.  
 
5.5.5  Performance requirements  
 
5.5.5.1  When operating under the test conditions specified in Table 5,  no condensed water shall drip, run or 
blow from the equip ment.  
 
5.5.5.2  Equipment which rejects condensate to the condenser air shall dispose of all condensate and there 
shall be no dripping or blowing -off of water from the equipment such that the building or surroundings become 
wet. 
 
6 Test methods and uncerta inties of measurements  
 
6.1 Test methods  
 
6.1.1  General  
 
Capacity tests shall be conducted in accordance with the testing requirements specified in Annex A , using 
either the calorimeter test method ( see Annex C)  or the indoor air enthalpy test method (see Annex D),  subject 
to the provision that the test results are within the limits of uncertainties of measurements established in 6.2. 
 
6.1.2  Calorimeter test method  
 
6.1.2.1  When using the calorimeter method for cooling capacity tests and for steady -state he ating capacity 
tests, two simultaneous methods of determining capacities shall be used. One method determines the capacity 
on the indoor -side, the other measures the capacity on the outdoor -side. The capacity determined using the 
outdoor -side data shall ag ree within 5 % of the value obtained using the indoor -side data for the test to be 
valid.  
 
6.1.2.2  Steady -state conditions are achieved when the measured capacity at each 5 -min time interval does 
not vary by more than 2 % from the average measured capacity  over the previous 35 min.  
 
6.1.3  Indoor air enthalpy test method  
 
6.1.3.1  For cooling capacity tests and steady -state heating capacity tests, a test of confirmation is 
recommended to verify the results obtained using the indoor air enthalpy test method. O ne of the following test 
methods can be used for confirmative purposes:  
 
a) refrigerant enthalpy method ( see Annex E);  
 
b) outdoor air enthalpy test method ( see Annex F ); 
 
c) indoor calorimeter confirmative test method (see Annex G);  
 
d) outdoor calorimete r confirmative test ( see Annex H ); 
 
e) balanced calorimeter confirmative test method ( see Annex I).  
 
NOTE  Annex I is not used as a confirmative test by testing laboratories ( see I.1.1 ).  
 DKS 2463: 2018  
 
16                © KEBS 2018  — All rights reserved  6.1.3.2  The results of the primary test shall agree with the results  of the confirmative test to within 5 % to be 
valid.  
 
Steady -state conditions are achieved when the measured capacity at each 5 -min time interval does not vary 
by more than 2 .5 % from the average measured capacity over the previous 35 min.  
 
6.1.4  Capacity tests  
 
On the cooling cycle, it is recommended that the latent cooling capacity be determined using the cooling 
condensate method (see Annex J ) subject to the provision that the test results are within the limits of 
uncertainties of measurements establishe d in 6.2. 
 
6.2 Uncertainties of measurement  
 
6.2.1  The uncertainties of measurement shall not exceed the values specified in Table 10.  
 
NOTE  Uncertainties of measurement can be estimated. ISO/TS 16491 is available as appropriate guidance.  
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  17  
Table 6 — Unce rtainties of measurement  
 
Measured quantity  Uncertainty of measurementa 
 
Water  
 
— temperature  
— temperature difference  
— volume flow  
— static pressure difference   
 
0.1 °C  
0.1 °C  
1 % 
 5.0 % 
Air 
 
— dry-bulb temperature  
— wet-bulb temperature  greater than 0 °Cb 
— wet-bulb temperature less than or equal to 0°Cb 
— volume flow  
— static pressure difference   
 
0.2 °C  
0.2 °C  
0.3 °C 
 5.0 %  
5 Pa for pressure ≤ 100 Pa  
5 for pressure > 100 Pa  
Electrical measurements  
 0.5 % 
Time  
 0.2 % 
Mass  
 1.0 % 
Speed  
 1.0 % 
Refrigerant pressure  
 2 % 
 
NOTE  Uncertainty of measurement comprises, in general, many components. Some of these 
components can be  estimated on the basis of the statistical distribution of the results of series of 
measurements and can be characterized by experimental standard deviations. Estimates of other 
components can be based on experience or other information. ISO/TS 16491 is av ailable as an appropriate 
guidance.  
 
a Uncertainty of measurement is an estimate characterizing the range of values within which the true 
value of the measurement lies, based on a 95 % confidence interval (see ISO/IEC Guide 98 -3). 
 
b This may be measured d irectly or indirectly.  
 
6.2.2  The steady -state cooling and heating capacities determined using the calorimeter method shall be 
determined with a maximum uncertainty of 5 %. This value is an expanded uncertainty of measurement 
expressed at the level of con fidence of 95 %.  
 
6.2.3  Heating capacity determined during transient operation (defrost cycles) using the calorimeter method 
shall be determined with a maximum uncertainty of 10 %. This value is an expanded uncertainty of 
measurement expressed at the level  of confidence of 95 %.  
 
6.2.4  The heating and cooling capacities measured on the air side using the air enthalpy method shall be 
determined with a maximum uncertainty of 10 %. This value is an expanded uncertainty of measurement 
expressed at a level of c onfidence of 95 %.  
 
6.3 Test tolerances for steady -state cooling and heating tests  
 DKS 2463: 2018  
 
18                © KEBS 2018  — All rights reserved  6.3.1  The maximum permissible variation of any individual observation from a specified test condition 
during a steady -state cooling and heating capacity test is listed in column 3 of Table 7. If a test condition is not 
specified, the values in column 3 of Table 7 represent the greatest permissible difference between maximum 
and minimum instrument observations during the test. When expressed as a percentage, the maximum 
allowable variation is the specified percentage of the arithmetical average of the observations.  
 
Table 7 — Variations allowed during steady -state cooling and heating capacity tests  
 
 
6.3.2  The maximum permissible variations of the average observations from the standard or specif ied test 
conditions are shown in column 2 of Table 7. 
 
6.3.3  For cooling capacity tests, the dry -bulb and wet -bulb temperatures of the air entering the indoor -side 
and outdoor -side shall be sampled at equal intervals spanning 30 s or less throughout the p reconditioning and 
data collection periods. The specified sampling of the wet -bulb temperature of the air entering the outdoor -
side shall be waived for equipment that rejects condensate to a location other than the outdoor coil.  
 
6.3.4  For steady -state hea ting capacity tests, the dry -bulb temperature of the air entering the indoor -side 
and the dry -bulb and wet -bulb temperatures of the air entering the outdoor -side shall be sampled at equal 
intervals spanning 30 s or less throughout the preconditioning and d ata collection periods.  
 
6.3.5  Except as noted in 6.3.3, all applicable parameters from Table 7 shall be sampled at equal intervals 
that span 5 min or less during cooling capacity tests. Except as noted in 6.3.4, all applicable parameters from 
Table 7 shall be sampled at equal intervals spanning 30 s or less during heating capacity tests.  
 
6.3.6  For the preconditioning period, equilibrium shall be defined as an interval of specified duration where 
the applicable test tolerances in Table 8 are satisfied. When a defrost cycle occurs during the preconditioning 
period of a heating capacity test, the parameters sampled between defrost initiation and 10 min after defrost 
termination shall be excluded when evaluating compliance to the test tolerances in Table 8. As noted in 5.1.8.5 , 
the sampling frequency of the indoor dry -bulb temperature is subject to change during defrost cycles, if using 
the indoor air enthalpy test method.  
 
6.3.7  For the data collection period used in determining the equipment’s measured sp ace conditioning 
capacity, compliance with the applicable Table 7 test tolerances shall be achieved.  Reading  Variation of arithmetical  
mean values from specified  
test condition s 
 
 
 Maximum variation of 
individual readings 
from specified test 
conditions  
 
Temperature of air entering indoor -side    
-dry – bulb 
-wet – bulb  ± 0.3 K  
± 0.2 K  ± 0.5 K  
± 0.3 K  
Temperature of air entering Outdoor -side    
-dry – bulb 
-wet – bulba ± 0.3 K 
± 0.2 Kb ± 0.5 K  
± 0.3 Ka 
Test voltage  ± 1 %  ± 2 %  
a    Only applicable to cooling capacity tests if equipment rejects condensate to the outdoor coil.  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  19  
6.4 Test tolerances for performance tests  
 
The maximum allowable variation of any individual observation made during a performance test from the 
specifie d test condition is shown in Table 8. 
 
 
Table 8 — Test tolerances for performance tests  
 
 
 
 
 
 
 
 
 
 
 
 
7 Test results  
 
7.1 Capacity results  
 
7.1.1  General  
 
The results of a capacity test shall express quantitatively the effects produced on air by the equipment tested. 
For given test co nditions, the capacity test results shall include the following quantities as applicable to cooling 
or heating:  
 
a)  total cooling capacity, in watts;  
 
b)  sensible cooling capacity, in watts;  
 
c)  latent cooling capacity, in watts;  
 
d)  heating capacity, in watts;  
 
e)  indoor -side airflow rate, m3/s of standard air;  
 
f)  effective power input to the equipment or individual power inputs to each of the electrical equipment 
components, in watts.  
 
NOTE 1  For a), b) and d), standard ratings for capacities inclu de the effects of the circulating fan heat.  
 
NOTE 2  For determination of latent cooling capacity, see Annex C if using the calorimeter test method and Annex D if using the indoo r 
air enthalpy test method.  
 Reading  Maximum variation of individual readings  
from specified test conditions a 
 
Air temperature   
-dry – bulb 
-wet – bulb  ± 1.0 K  
± 0.5 K  
Water Temperature  ± 0.5 K  
Test voltage  ± 2 %  
a    The test tolerances do not apply when the equipment is stopped, when changing 
compressor speed or from defrost initiation to 10 min after defrost termination. During these 
intervals, dry -bulb temperature tolerances of ±  2.5 K on the indoor -side and ±  5 K on the 
outside shall apply.  
 DKS 2463: 2018  
 
20                © KEBS 2018  — All rights reserved  7.1.2  Adjustments  
 
7.1.2.1  Test results shall be u sed to determine capacities without adjustment for permissible variations in test 
conditions. Air enthalpies, specific volumes and isobaric specific heat capacities shall be based on the 
measured barometric pressure.  
 
7.1.2.2  For calorimetric testing, vari ations from standard barometric pressure may have an impact on the 
measured capacity. If capacity, adjusted for standard barometric pressure, is additionally reported an 
explanation of the adjustment method should be included in the test report.  
 
7.1.3  Cooling capacity calculations  
 
7.1.3.1  An average cooling capacity shall be determined from the set of cooling capacities recorded over the 
data collection period.  
 
7.1.3.2  An average electrical power input shall be determined from the set of electrical power  inputs recorded 
over the data collection period or from the integrated electrical power for the same interval, for cases where 
an electrical energy meter is used.  
 
7.2  Data to be recorded  
 
The data to be recorded for the capacity tests are given in Table s 9 for the calorimeter test method and in 
Table 1 0 for the indoor air enthalpy test method. The tables identify the general information required, but are 
not intended to limit the data to be obtained. Electrical input values used for rating purpos es shall be those 
measured during the capacity tests.  
 
7.3 Test report  
 
7.3.1  General information  
 
As a minimum, the test report shall contain the following general information:  
 
a) a reference to this document, i.e. DKS 2463 ; 
 
b)  date;  
 
c) test institute ; 
 
d) test location;  
 
e) primary test and confirmative test methods;  
 
f) test supervisor;  
 
g) cooling climate type designations ( i.e. T1)  
 
h)  description of test set -up, including equipment location;  and 
 
i)  nameplate information ( see 8.2). 
 
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  21  
Table 9 — Data to be recorded for calorimeter cooling capacity tests  
 
No. Data  
1 Date  
2 Observers  
3 Barometric pressure, in kPa  
4 Fan speed settings, indoor and outdoor  
5 Applied voltage, in V  
6 Frequency, in Hz  
7 Total current input to equipment, in A  
8 Total power input to equipmenta, in W  
9 Setting of variable capacity compressor at full load  
10 Dry-bulb and wet -bulb temperatures of air (indoor -side calorimeter test chamber)b, in °C  
11 Dry-bulb and wet -bulb temperature of air (outdoor -side calorimeter test chamber)b, in °C  
12 Average air temperature outside the calorimeter, if calibrated (see Figure  C.1),  in °C  
13 Total power input to indoor -side and outdoor -side test chamber, in kW  
14 Quantity of water evaporated in humidifier, in kg  
15 Temperature  of humidifier water entering indoor -side and outdoor -side (if used) test chambers 
or in humidifier tank, in °C  
16 Cooling water flow rate through outdoor -side test chamber heat -rejection coil, in l/s  
17 Temperature of cooling water entering outdoor -side test chamber, for heat -rejection coil, in °C  
18 Temperature of cooling water leaving outdoor -side test chamber, for heat -rejection coil, in °C  
19 Mass of water from equipment which is condensed in the reconditioning equipmentc, in kg  
20 Temperature of condensed water leaving outdoor -side test chamber, in °C  
21 Volume of airflow through measuring nozzle of the separating partition, in m3/s  
22 Air-static pressure difference across the separating partition of calorimeter test chambers, in 
Pa 
23 Refriger ant charge, added by the test house, in kg  
24 Factory charge, in kg  
 
a  Total power input to the equipment, except if more than one external power connection is provided on 
the equipment; record input to each connection separately.  
b  For equipment that evaporates condensate on the outdoor coil.  
 
 
  DKS 2463: 2018  
 
22                © KEBS 2018  — All rights reserved  Table 1 0 — Data to be recorded during the indoor air enthalpy capacity tests  
 
No. Data  
1 Date  
2 Observers  
3 Barometric pressure, in kPa  
4 Time of test  
5 Power input to equipmenta, in W  
6 Energy input to  equipmentb, in Wh  
7 Applied voltage(s), in V  
8 Current, in A  
9 Frequency, in Hz  
10 External resistance to airflow, in Pa  
11 Fan speed settings, indoor and outdoor  
12 Setting of variable capacity compressor at full load  
12 Dry-bulb temperature of ai r entering equipment, in °C  
13 Wet-bulb temperature of air entering equipment, in °C  
14 Dry-bulb temperature of air leaving equipment, in °C  
15 Wet-bulb temperature of air leaving equipment, in °C  
16 Outdoor dry -bulb and wet -bulb temperatures, in °C  
17 Volume flow rate of air and all relevant measurements for its calculation, in m3/s  
18 Refrigerant charge added by the test house, in kg  
19 Factory charge, in kg  
a  Total power input and, where required, input to equipment components.  
b  Energy input t o equipment is required only during defrost operations.  
 
7.3.2  Capacity tests  
 
The values reported shall be the mean of the values taken over the data collection period and shall be stated 
with an uncertainty of measurement at a confidence level of 95 % a nd in accordance with ISO/IEC Guide 98 -
3. 
 
NOTE  Uncertainties of measurement can be estimated. ISO/TS 16491 is available as appropriate  guidance.  
 
7.3.3  Performance tests  
 
7.3.3.1  The test report shall indicate whether the test passed or failed based upon  recorded data.  For all 
performance tests , relevant information shall be recorded to show the specific requirements for each test has 
been met. This shall be as a minimum the data requirements of Table 9 or 10 (as appropriate) recorded at 
least once every  5 min, and additionally, information listed in 7.3.3.2 to 7.3.3.5. 
 
7.3.3.2  For maximum cooling performance tests (5.2):  
 
a) current recorded at least once every 5 min, in A;  
 
b) time at which the power to the unit was interrupted;  
 
c) time(s) at which the unit au tomatically starts and/or stops operating.  
 
7.3.3.3  For minimum cooling, freeze -up air blockage and freeze = up drip performance tests (5.3):  
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  23 a) coil circuit temperatures or the suction pressure recorded at least once every 1 min.  
 
7.3.3 4  For freeze -up drip performance test (5.4):  
 
a) pictures or sketches of the unit at the end of the test that clearly depict any areas of moisture outside of 
the unit.  
 
7.3.3.5  For condensate control and enclosure sweat performance test (5.5):  
 
a)  pictures or sketches of  the unit at the end of the test that clearly depict any areas of moisture outside of 
the unit.  
 
8 Marking provisions  
 
8.1 Nameplate requirements  
 
Each individual unit of the air conditioner, single package and split -system assembly, shall have a durable 
nameplate, firmly attached to it and in a location accessible for reading.   
 
8.2 Nameplate information  
 
The nameplate shall carry the following minimum information, in addition to the information required by 
international standards on safety : 
 
a) manufactur er’s name or trademark;  
 
b) any distinctive type or model number and serial number;  
 
c) rated voltage(s);  
 
d) rated frequency(ies);  
 
e) cooling climate designations (i.e. T1)  
 
f) refrigerant designation in accordance with ISO 817  and or an existing nation al regulation;  
 
g) factory refrigerant mass charge [listed on the unit containing the compressor(s)].  
 
8.3 Split systems  
 
The information in 8.2 a), b), c), d), and g) shall also be provided on each indoor element of a split system and 
g) shall be provided  on the outdoor unit.  
 
8.4 Energy guide label  
 
Each non -ducted air conditioner shall have an energy guide label visibly attached to the front of the unit. Label 
requirements are as specified in Annex L. 
 
8.5 Energy efficiency ratios shall be calculated in  (Watts/Watt)  
 
8.6 Single packaged non duct ed air conditioners shall have  EERs and their corresponding star ratings as per 
Table 11 . 
  DKS 2463: 2018  
 
24                © KEBS 2018  — All rights reserved  Table 11 
 
Star EER Star Rating  
1 2.5 – 2.69  
2 2.7 – 2.89  
3 2.9 – 3.09  
4 3.1 – 3.29  
5 (3.3 and abov e)  
 
8.7 Split non ducted air conditioners shall have EERs and their corresponding star ratings  as per Table 12 . 
 
Table 12 
 
Star EER Star Rating  
1 3.1˗ 3.29   
2 3.3– 3.49  
3 3.5 – 3.99  
4 4.0 – 4.49  
5 4.5 and above   
 
9 Public ation of ratings  
 
9.1 Standard ratings  
 
9.1.1  Standard ratings shall be published for cooling capacities (sensible, latent and total), and EER for all 
systems produced in conformance to this document. These ratings shall be based on data obtained at the 
established rating conditions in accordance with the provisions of this document.  
 
9.1.2  The values of the standard capacities shall be expressed in kilowatts or watts, rounded to three 
significant figures.  
 
9.1.3  The values of EER shall be rounded to three significant figures.  
 
9.1.4  Each capacity rating shall be followed by the corresponding test voltage ( see column 2 of Table 2 ) 
and frequency rating.  
 
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  25 Annex A  
(normative)  
 
Test requirements  
 
A.1  General test room requirements  
 
A.1.1   If an indoor conditi on test room is required, it shall be a room or space in which the desired test 
conditions can be maintained within the prescribed tolerances. It is recommended that air velocities in the 
vicinity of the equipment under test not exceed 2,5 m/s.  
 
A.1.2   If an outdoor condition test room or space is required, it shall be of sufficient volume and shall circulate 
air in a manner such that it does not change the normal air circulating pattern of the equipment under test. It 
shall be of such dimensions that the d istance from any room surface to any equipment surface from which air 
is discharged is not less than 1,8 m and the distance from any other room surface to any other equipment 
surface is not less than 1,0 m, except for floor or wall relationships required f or normal equipment installation. 
The room conditioning apparatus should handle air at a rate not less than the outdoor airflow rate, and 
preferably should take this air from the direction of the equipment air discharge and return it at the desired 
conditi ons uniformly and at low velocities.  
 
A.1.3   If the calorimeter room method is used with a facility having more than two rooms, then the additional 
rooms shall also comply with the requirements of Annex C . If the air enthalpy method is used with a facility  
having more than two rooms, the additional rooms shall also comply with the requirements of Annex D.  
 
A.2  Equipment installation  
 
A.2.1  The equipment to be tested shall be installed in accordance with the manufacturer’s installation 
instructions using re commended installation procedures and accessories. If the equipment can be installed in 
multiple positions, all tests shall be conducted using the least favourable configuration according to the 
manufacturer’s recommendation. In all cases, the manufacturer ’s recommendations with respect to distances 
from adjacent walls, amount of extensions through walls, etc. shall be followed.  
 
A.2.2  Ducted equipment rated at less than 8 kW and intended to operate at external static pressures of less 
than 25 Pa shall be t ested at free delivery of air.  
 
A.2.3  No other alterations to the equipment shall be made except for the attachment of the required test 
apparatus and instruments in the prescribed manner.  
 
A.2.4  If necessary, the equipment shall be evacuated and charged w ith the type and amount of refrigerant 
specified in the manufacturer’s instructions.  
 
A.2.5  All standard ratings for equipment in which the condenser and the evaporator are two separate 
assemblies shall be determined with 5 m to 7,5 m length of connecting refrigerant tubing on each line. The 
lengths shall be actual lengths, not equivalent lengths, and no account shall be taken of the resistance provided 
by bends, branches, connecting boxes or other fittings used in the installation for the test piece. The l ength of 
the connecting tubing shall be measured from the enclosure of the indoor unit to the enclosure of the outdoor 
unit. Such equipment in which the interconnecting tubing is furnished as an integral part of the unit and not 
recommended for cutting to length shall be tested with the complete length of tubing furnished. Not less than 
40 % of the total length of the interconnecting tubing shall be exposed to the outdoor conditions with the rest 
of the tubing exposed to the indoor conditions. The line diam eters, insulation, details of installation, evacuation 
and charging shall be in accordance with the manufacturer ’s published recommendations.  
  DKS 2463: 2018  
 
26                © KEBS 2018  — All rights reserved   
Annex B  
(informative)  
 
Airflow measurement  
B.1  Airflow determination  
 
B.1.1   Airflow should be measured using  the apparatus and testing procedures given in this annex.  
 
B.1.2   Airflow quantities are determined as mass flow rates. If airflow quantities are to be expressed for 
rating purposes in volume flow rates, such ratings should state the conditions (pressure,  temperature and 
humidity) at which the specific volume is determined.  
 
B.2  Airflow and static pressure  
 
The area of a nozzle, An, should be determined by measuring its diameter to an accuracy of ±  0,2 % in four 
locations approximately 45° apart around th e nozzle in each of two places through the nozzle throat, one at 
the outlet and the other in the straight section near the radius.  
 
B.3  Nozzle apparatus  
 
B.3.1   Nozzle apparatus, consisting of a receiving chamber and a discharge chamber separated by a 
partition in which one or more nozzles are located ( see Figure B.1).  Air from the equipment under test is 
conveyed via a duct to the receiving chamber, passes through the nozzle(s) and is then exhausted to the test 
room or channelled back to the equipment’s i nlet. 
 
B.3.2  The nozzle apparatus and its connections to the equipment’s inlet should be sealed such that air 
leakage does not exceed 1,0 % of the airflow rate being measured.  
 
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  27  
 
Key 
 
1 Discharge chamber                              5 Nozzle  
 
2 Exhaus t fan                                          6 Receiving chamber  
 
3 Diffusion baffle                                      7 Apparatus for differential pressure measurement  
 
4 Pitot tube (optional)                                       8 Adapter duct (s ee B.5.1)  
 
a Diffusion baffles should have uniform perforations, with approximately 40 % of free area  
 
b Airflow.  
 
 
Figure B.1 — Airflow measuring apparatus  
 
The centre -to-centre distance between nozzles in use should not be less than 3 times the throat diameter of 
the larger nozzle and the distance from the centre of any nozzle to the nearest discharge or receiving chamber 
side wall should not be less than 1,5 times its throat diameter.  
 
B.3.2   Diffusers,  installed in the receiving chamber (at a distance  at least 1,5 times the largest nozzle throat 
diameter, Dn) upstream of the partition wall and in the discharge chamber (at a distance at least 2,5 times the 
largest nozzle throat diameter, Dn) downstream of the exit plane of the largest nozzle.  
 
B.3.3  Exhaust fan , capable of providing the desired static pressure at the equipment’s outlet, installed in 
one wall of the discharge chamber and provided with a means of varying its capacity.  
 
B.3.4  Manometers , for measuring the static pressure drop across the n ozzle(s). One end of the manometer 
should be connected to a static pressure tap located flush with the inner wall of the receiving chamber and the 
other end to a static pressure tap located flush with the inner wall of the discharge chamber, or preferably,  
several taps in each chamber should be connected to several manometers in parallel or manifolded to a single 
manometer. Static pressure connections should be located so as not to be affected by airflow. Alternatively, 
the velocity head of the air stream l eaving the nozzle(s) may be measured by a Pitot tube as shown in Figure 
B.1, but when more than one nozzle is in use, the Pitot tube reading should be determined for each nozzle.  
B.3.5   Means of determining the air velocity at the nozzle throat.  
DKS 2463: 2018  
 
28                © KEBS 2018  — All rights reserved   
B.3.5.1  The throat velocity of any nozzle in use should be not less than 15 m/s or more than 35 m/s.  
 
B.3.5.2  Nozzles should be constructed in accordance with Figure B.2 and applied in accordance with the 
provisions of B.3.5.3 and B.3.5.4.  
 
B.3.5.3  The nozzle disch arge coefficient, Cd, for the construction shown in Figure B.2, which has a throat 
length to throat diameter ratio of 0,6, may be determined using Formula (B.1).  
 
Cd  = 0.9986 ˗𝟕.𝟎𝟎𝟔
√𝑹𝒆 +𝟏𝟑𝟒 .𝟔
𝑹𝒆                                                                                         (B.1)   
for Reynolds numbers, Re, of 12 000 and above.  
The Reynolds number is defined as Formula (B.2) . 
Re = 𝒗𝒂 𝑫𝒏
𝒗                                                                                                                 (B.2) .  
where   
va  is the mean airflow velocity at the throat of the nozzle;  
Dn is the diameter of the throat of the nozzle;  
v  is the k inematic viscosity of air.  
 
B.3.5.4  Nozzles may also be constructed in accordance with appropriate national standards, provided they 
can be used in the apparatus described in Figure B.1 and result in equivalent accuracy.  
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  29  
 
 
 
  
Key  
1 axes of ellipse  
2 throat section  
3 elliptical approach  
Dn diameter of nozzle throat, in m  
 
 
Figure B.2 — Airflow measuring nozzle  
 
B.4  Static pressure measurements  
 
B.4.1  The pressure taps should consist of (6,25 ± 0,25) mm diameter nipples soldered to the outer plenum 
surfaces and centred over 1 mm diameter holes through the plenum. The edges of these holes should be free 
of burrs and other surface irregularities.  
 
B.4.2  The plenum and duct section should be sealed to prevent air leakage, particularly at the connections  
to the equipment and the air measuring device, and should be insulated to prevent heat leakage between the 
equipment outlet and the temperature measuring instruments.  
 
B.5 Discharge airflow measurements  
B.5.1  The outlet or outlets of the equipment under t est should be connected to the receiving chamber by 
adaptor ducting of negligible air resistance, as shown in Figure B.1 . 
DKS 2463: 2018  
 
30                © KEBS 2018  — All rights reserved  B.5.2  To establish zero static pressure with respect to the test room at the discharge of the air conditioner or 
heat pump in the rece iving chamber, a manometer should have one side connected to one or more static 
pressure connections located flush with the inner wall of the receiving chamber.  
 
B.6 Indoor -side airflow measurements  
B.6.1  The following readings should be taken:  
 
a)  barome tric pressure;  
 
b)  nozzle dry - and wet -bulb temperatures or dewpoint temperatures;  
 
c)  static pressure difference at the nozzle(s) or optionally, nozzle velocity pressure;  
 
B.6.2  Air mass flow rate, qm, through a single nozzle is determined using Formul a (B.3) .  
𝑞𝑚= 𝑌×𝐶𝑑×𝐴𝑛  √2𝑝𝑣
𝑣′𝑛                                                                                                                                                      (B.3).  
 
 
where  
 
An is the area of the nozzle throat, in   square metres (m2). 
 
The expansion factor, Y, is obtained from Formula (B.4) : 
 
𝑌=0.452 + 0.548 𝛼                                                                                                      (B.4)  
 
The pressure ratio, α, is obtained from Formula ( B.5): 
 
 𝛼=1−𝑝𝑣
𝑝𝑛                                                                                                                             (B.5)   
 
Air volume flow rate, qv, through a single nozzle is determined using Formula (B.6) . 
 
𝑞𝑣=𝑌×𝐶𝑑×𝐴𝑛 √2𝑝𝑣𝑣′𝑛                                           (B.6).  
 
where V′n is calculated using Formula (B.7) : 
 
𝑉′𝑛=𝑣𝑛
1+𝑊𝑛                                                                                             (B.7)  
 
and Wn is the specific humidity at the nozzle inlet.  
 
Air volume flow rate expressed in terms of standard air qs is calculated by Formula (B.8) . 
 
𝑞𝑠=𝑞𝑣
1.204 𝑣′𝑛                                                                                                              (B.8)  
B.6.3  Airflow through multiple nozzles may be calculated in accordance with B.6.2 , except that the total 
flow rate is then the sum of the qm or qv values for each nozzle used.  
 
B.7 Ventilation, exhaust and leak age airflow measurements — Calorimeter test method  
 
B.7.1  Ventilation, exhaust and leakage airflows should be measured using apparatus similar to that 
illustrated in Figure B.3 with the refrigeration system in operation and after condensate equilibrium has  been 
obtained.  
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  31 B.7.2  With the equalizing device adjusted for a maximum static pressure differential between the indoor -
side and outdoor -side test chambers of 1 Pa, the following readings should be taken:  
 
a)  barometric pressure;  
 
b)  nozzle wet - and dry -bulb temperatures;  
 
c)  nozzle velocity pressure.  
 
 
Key 
1 pressure manometers  4 damper  
2 discharge chamber  5 nozzle  
3 exhaust fan  6 pick-up tube  
pc test chamber equalization pressure  
pv nozzle velocity pressure  
 
Figure B.3 — Pressure -equalizing devi ce 
 
B.7.3   Airflow values should be calculated in accordance with B.6.2.    
DKS 2463: 2018  
 
32                © KEBS 2018  — All rights reserved  Annex C  
(normative)  
 
Calorimeter test method  
 
C.1  General  
 
C.1.1  The calorimeter provides a method for determining capacity simultaneously on both the indoor -side 
and the outdoor -side. In the cooling mode, the indoor -side capacity determination should be made by balancing 
the cooling and dehumidifying effects with measured heat and water inputs. The outdoor -side capacity 
provides a confirmative test of the cooling and dehumidifying effects by balancing the heat and water rejection 
on the condenser side with a measured amount of cooling.  
 
C.1.2  The two calorimeter test chambers, indoor -side and outdoor -side, are separated by an insulated 
partition having an opening into which the non -ducted, single -packaged equipment is mounted. The equipment 
should be installed in a manner similar to a normal installation. No effort should be made to seal the internal 
construction of the equipment to prevent air leakage from the condenser side to the evaporator side or vice 
versa. No connections or alterations should be made to the equipment which might in any way alter its normal 
operation.  
 
C.1.3  A pressure -equalizing device, as illustrated in Figure B.3, should be provided in the partition wall 
betw een the indoor -side and the outdoor -side test chambers to maintain a balanced pressure between these 
test chambers and also to permit measurement of leakage, exhaust and ventilation air. This device consists 
of one or more nozzles of the type shown in Figu re B.2, a discharge chamber equipped with an exhaust fan 
and manometers for measuring test chamber and airflow pressures.  
Since the airflow from one test chamber to the other may be in either direction, two such devices mounted in 
opposite directions or a reversible device should be used. The manometer pressure pickup tubes should be 
located so as to be unaffected by air discharged from the equipment or by the exhaust from the pressure -
equalizing device. The fan or blower, which exhausts air from the discha rge chamber, should permit variation 
of its airflow by any suitable means, such as a variable speed drive or a damper as shown in Figure B.3. The 
exhaust from this fan or blower should be such that it does not affect the inlet air to the equipment.  
The pre ssure equalizing device should be adjusted during calorimeter tests or airflow measurements so that 
the static pressure difference between the indoor -side and outdoor -side test chambers is not greater than 1,25 
Pa. 
 
C.1.4  The size of the calorimeter should  be sufficient to avoid any restriction to the intake or discharge 
openings of the equipment. Perforated plates or other suitable grilles should be provided at the discharge 
opening from the reconditioning equipment to avoid face velocities exceeding 0,5 m /s. Sufficient space should 
be allowed in front of any inlet or discharge grilles of the equipment to avoid interference with the airflow. 
Minimum distance from the equipment to side walls or ceiling of the test chamber(s) should be 1 m, except for 
the bac k of console -type equipment, which should be in normal relation to the wall. Ceiling -mounted equipment 
should be installed at a minimum distance of 1,8 m from the floor. Table C.1 gives the suggested dimensions 
for the calorimeter. To accommodate peculiar sizes of equipment, it may be necessary to alter the suggested 
dimensions to comply with the space requirements.  
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  33  
Table C.1 — Sizes of calorimeter  
 
Rated cooling capacity 
of equipmenta 
W Suggested minimum inside dimensions of each room of the 
calorimeter  
m 
Width  Height  Length  
3 000  2,4 2,1 1,8 
6 000  2,4 2,1 2,4 
9 000  2,7 2,4 3,0 
12 000b 3,0 2,4 3,7 
a  All figures are round numbers.  
 
b  Larger capacity equipment requires larger calorimeters.  
 
C.1.5   Each test chamber should be provided with recondi tioning equipment to maintain specified airflow 
and prescribed conditions. Reconditioning apparatus for the indoor -side test chamber should consist of heaters 
to supply sensible heat and a humidifier to supply moisture. Reconditioning apparatus for the out door-side test 
chamber should provide cooling, dehumidification and humidification. The energy supply should be controlled 
and measured.  
 
C.1.6  When calorimeters are used for heat pumps, they should have heating, humidifying and cooling 
capabilities for bo th rooms (see Figures C.1 and C.2) or other means, such as rotating the equipment, may be 
used as long as the rating conditions are maintained.  
 
C.1.7   Reconditioning apparatus for both test chambers should be provided with fans of sufficient capacity 
to ensure airflows of not less than twice the quantity of air discharged by the equipment under test in the 
calorimeter. The calorimeter should be equipped with means of measuring or determining specified wet - and 
dry-bulb temperatures in both calorimeter test  chambers.  
 
C.1.8   It is recognized that in both the indoor -side and outdoor -side test chambers, temperature gradients 
and airflow patterns result from the interaction of the reconditioning apparatus and test equipment. Therefore, 
the resultant conditions are peculiar to and dependent on a given combination of test chamber size, 
arrangement and size of reconditioning apparatus and the air discharge characteristics of the equipment under 
test. 
 
The point of measurement of specified test temperatures, both we t- and dry -bulb, should be such that the 
following conditions are fulfilled:  
 
a)  The measured temperatures should be representative of the temperature surrounding the equipment and 
should simulate the conditions encountered in an actual application for bo th indoor and outdoor -sides, as 
indicated above.  
 
b)  At the point of measurement, the temperature of air should not be affected by air discharged from any 
piece of the equipment. This makes it mandatory that the temperatures are measured upstream of any r e-
circulation produced by the equipment.  
 
c)  Air sampling tubes should be positioned on the intake side of the equipment under test.  
 
d)  When testing multi -split air conditioners and heat pumps, the dry -bulb temperature of air entering all indoor 
units o r an outdoor unit shall be within 0,5 K of the average.  DKS 2463: 2018  
 
34                © KEBS 2018  — All rights reserved  C.1.9   During a heating capacity test, the temperature of the air leaving the indoor -side of the heat pump 
shall be monitored to determine if its heating performance is being affected by a build -up of  ice on the outdoor -
side heat exchanger. A single temperature measuring device, placed at the centre of the indoor air outlet, is 
sufficient to indicate any change in the indoor air discharge temperature caused by a build -up of ice on the 
outdoor -side heat  exchanger.  
 
C.1.10   Interior surfaces of the calorimeter test chambers should be of non -porous material with all joints 
sealed against air and moisture leakage. The access door should be tightly sealed against air and moisture 
leakage by use of gaskets or  other suitable means.  
 
C.1.11   If defrost controls on the heat pump provide for stopping the indoor airflow, provisions shall be made 
to stop the test apparatus airflow to the equipment on both the indoor and outdoor -sides during such a defrost 
period. If  it is desirable to maintain operation of the reconditioning apparatus during the defrost period, 
provisions may be made to bypass the conditioned air around the equipment as long as assurance is provided 
that the conditioned air does not aid in the defros ting. A watt -hour meter shall be used for obtaining the 
integrated electrical input to the equipment under test.  
 
 
 
Key 
1 outdoor -side test chamber  6 mixer  
2 cooling coil  7 air sampling tube  
3 heating coil  8 equipment under test  
4 humidifier  9 indoor -side test chamber  
5 fan 10 Pressure equalization 
device  
 
Figure C.1 — Typical calibrated room -type calorimeter  
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  35  
 
 
Key 
 
1 controlled -temperature air space  7 mixer  
2 outdoor -side test chamber  8 air sampling tube  
3 cooling coil  9 equipment under test  
4 heating coil  10 indoor -side test chamber  
5 humidifier  11 pressure equalization device  
6 fan 
 
Figure C.2 — Typical balanced ambient room -type calorimeter  
  
DKS 2463: 2018  
 
36                © KEBS 2018  — All rights reserved  C.2  Calibrated room -type calorimeter  
 
C.2.1  Heat leakage may be determined in either the indoor -side or outdoor -side test chamber by the 
following method: All openings should be closed. Either test chamber may be heated by electric heaters to a 
temperature of at least 11 °C above the surrounding ambient temperature. The ambient temperature should 
be maintained constant within ±1 K outside all six enveloping surfaces of the test chamber, including the 
separating partition. If the construction of the partition is identical to that of the other walls, the heat leakage 
through the partition may be determ ined on a proportional area basis.  
 
C.2.2  For calibrating the heat leakage through the separating partition alone, the following procedure may 
be used: a test is carried out as described above. Then the temperature of the adjoining area on the other side 
of the separating partition is raised to equal the temperature in the heated test chamber, thus eliminating heat 
leakage through the partition, while the 11 °C differential is maintained between the heated test chamber and 
the ambient surrounding the other  five enveloping surfaces.  
The difference in heat input between the first test and the second test permits determination of the leakage 
through the partition alone.  
 
C.2.3   For the outdoor -side test chamber equipped with means of cooling, an alternative me ans of 
calibration may be to cool the test chamber to a temperature of at least 11 °C below the ambient temperature 
(on six sides) and carry out a similar analysis.  
 
C.2.4   In addition to the two -room simultaneous method of determining capacities, the perf ormance of the 
indoor room -side test chamber may be verified at least every six months using an industry standard cooling 
capacity calibrating device. A calibrating device may also be another piece of equipment whose performance 
has been measured by the si multaneous indoor and outdoor measurement method at an accredited national 
test laboratory as part of an industry -wide cooling capacity verification programme.  
The indoor -side calorimeter including the central partition and the outdoor -side calorimeter sha ll be insulated 
so that heat leakage (including radiation) does not exceed 5 % of the equipment capacity. Space where enough 
air circulation is available shall be secured under the floor of the room -type calorimeter.  
 
C.3  Balanced ambient room -type calori meter  
 
C.3.1   The balanced ambient room -type calorimeter is shown in Figure C.2 and is based on the principle of 
maintaining the dry -bulb temperatures surrounding the particular test chamber equal to the dry -bulb 
temperatures maintained within that test ch amber. If the ambient wet -bulb temperature is also maintained 
equal to that within the test chamber, the vapour -proofing provisions of C.1.10 are not required.  
 
C.3.2   The floor, ceiling and walls of the calorimeter test chambers shall be spaced a sufficie nt distance 
away from the floor, ceiling and walls of the controlled areas in which the test chambers are located in order 
to provide a uniform air temperature in the intervening space. It is recommended that this distance be at least 
0,3 m. Means shall be  provided to circulate the air within the surrounding space to prevent stratification.  
 
C.3.3   Heat leakage through the separating partition shall be introduced into the heat balance calculation 
and may be calibrated in accordance with C.3.4 or may be calc ulated.  
 
C.3.4   It is recommended that the floor, ceiling and walls of the calorimeter test chambers be insulated so 
as to limit heat leakage (including radiation) to no more than 10 % of the test equipment’s capacity, with an 
11 °C temperature difference,  or 300 W for the same temperature difference, whichever is the greater, as 
tested using the procedure given in C.2.2 .   
 
C.4 Calculation of cooling capacity  
 
C.4.1  The energy flow quantities used to calculate the total cooling capacity, based on indoor -side and 
outdoor -side measurements, are shown in Figure C.3 . 
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  37  
 
 
Key 
1 outdoor -side test chamber  
2 equipment under test  
3 indoor -side test chamber  
 
NOTE   Values for the variables identified in the figure are calculated using Formulae (C.1) to (C.6) . 
Figure C.3 — Calorimeter energy flows during cooling capacity tests  
C.4.2   The total cooling capacity on the indoor -side, ϕtcitci , as tested in either the calibrated or balanced 
ambient, room -type calorimeter (see Figures C.1 and C.2), is calculated using Formula (C.1) . 
∅𝑡𝑐𝑖=∑𝑝𝑖𝑐+(ℎ𝑤1−ℎ𝑤2)𝑤𝑟+∅𝐼𝑝+∅𝐼𝑖                                             C.1                
 
NOTE   If no water is introduced during the test, hw1 is taken at the temperature of the water in the humidifier  tank of the conditioning 
apparatus.  
When a cooling coil of the indoor -side calorimeter is used for testing of small capacity units, in order to stabilize 
the test condition, Formula (C.2) shall be used and requirements for uncertainties of measurements sp ecified 
in 7.2.2 shall be satisfied. ϕci in Formula (C.2) is the amount of heat exchanged in the cooling coil of the indoor -
side calorimeter.  
∅𝑡𝑐𝑖=∑𝑝𝑖𝑐+(ℎ𝑤1−ℎ𝑤2)𝑤𝑟+∅𝐼𝑝+∅𝐼𝑖−∅𝑐𝑖                                                            (C.2)  
C.4.3   When it is not practical to measure the temperature of the air leaving the indoor -side test chamber 
to the outdoor -side test chamber, the temperature of the condensate may be assumed to be at the measured 
or estimated wet -bulb temperature of the air leaving the test equipment.  
DKS 2463: 2018  
 
38                © KEBS 2018  — All rights reserved  C.4.4  The water vapour condensed by the equipment under test, Wr, may be determined by the amount 
of water evaporated into the indoor -side test chamber by the reconditioning equipment to maintain the 
required humidity.  
 
C.4.5  Heat leak age, ϕlp, into the indoor -side test chamber through the separating partition between the 
indoor -side and outdoor -side test chambers may be determined from the calibrating test or, in the case of the 
balanced -ambient room -type test chamber, may be based on calculations.  
 
C.4.6  The total cooling capacity on the outdoor -side, ϕtco, as tested in either the calibrated or balanced -
ambient, room -type calorimeter (see Figures C.1 and C.2) is calculated using Formula (C.3) . 
 
∅𝑡𝑐𝑜=∅𝑐−∑𝑃𝑜𝑐−𝑃𝑡+(ℎ𝑤3−ℎ𝑤2)𝑊𝑟+∅𝐼𝑝+∅𝐼𝑜                                                                   (C.3)  
NOTE  The hw3 enthalpy is taken at the temperature at which the condensate leaves the outdoor -side test chamber of the 
reconditioning apparatus . 
C.4.7  The heat leakage rate into the indoor -side test chamber through the separating partition between the 
indoor -side and outdoor -side test chambers, ϕlp, may be determined from the calibrating test or, in the case 
of the balanced -ambient room -type test  chamber, may be based on calculations.  
NOTE  This quantity is numerically equal to that used in Formula C.1 if, and only if, the area of the separating partition exposed to the 
outdoor -side is equal to the area exposed to the indoor -side test chamber.  
C.4.8  The latent cooling capacity (room dehumidifying capacity), ϕd, is calculated using Formula (C.4) . 
∅𝑑=𝐾1𝑊𝑟                                                                                                                                          (C.4)  
C.4.9  The sensible cooling capacity, ϕsci, is calcula ted using Formula (C.5) . 
∅𝑠𝑐𝑖=∅𝑡𝑐𝑖−∅𝑑                                                                                                   (C.5)  
C.4.10   Sensible heat ratio (SHR) is calculated using Formula (C.6) . 
𝑆𝐻𝑅 =∅𝑠𝑐𝑖∅𝑡𝑐𝑖 ⁄                                                                                                                      (C.6)  
C.5  Calculation of heating capacity  
 
C.5.1   The energy flow quantities used to calculate the total heating capacity, based on ind oor-side and 
outdoor -side measurements, are shown in Figure C.4 . 
 
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  39  
Key 
 
1 outdoor -side test chamber  
2 equipment under test  
3 indoor -side test chamber  
 
 
NOTE  Values for the variables identified in this figure are calculated using Formulae (C.7) and (C.8). 
Figure C.4 — Calorimeter energy flows during heating capacity tests  
C.5.2  Determination of the heating capacity by measurement in the indoor -side test chamber of the  
calorimeter, ϕhi, is calculated using Formula (C.7) . 
 
∅ℎ𝑖=∅𝑐𝑖−∑𝑃𝑖𝑐−∅𝐼𝑝−∅𝐼𝑖                                                                                               (C.7)  
 
NOTE Σ Pic is the other power input to the indoor -side test chamber (e.g. illumination, electrical and thermal 
power input to the compens ating device, heat balance of the humidification device), in watts.  
 
C.5.3   Determination of the heating capacity by measurement of the heat absorbing side, ϕho, is calculated 
for equipment where the evaporator takes the heat from an airflow using Formula (C.8) . 
 
∅ℎ𝑜=∑𝑃𝑜𝑐+𝑃𝑡+(ℎ𝑤4−ℎ𝑤5)𝑞𝑤𝑜−∅𝐼𝑝−∅𝐼𝑜                                                                                            (C.8)  
  
DKS 2463: 2018  
 
40                © KEBS 2018  — All rights reserved  Annex D  
(normative)  
 
Indoor air enthalpy test method  
D.1 General  
 
In the a ir enthalpy test method, capacities are determined from measurements of entering and leaving wet - 
and dry -bulb temperatures and the associated airflow rate.  
 
D.2 Application  
 
D.2.1  Air leaving the equipment under the test shall lead directly to the dischar ge chamber. If a direct 
connection cannot be made between the equipment and the discharge chamber, a short plenum shall be 
attached to the equipment. In this case, the short plenum shall have the same size as the discharge opening 
of the equipment or shall  be constructed so as not to prevent the leaving air from expanding. The cross -section 
area of the airflow channel through the discharge chamber shall be such that the average air velocity is less 
than 1,25 m/s against the airflow rate of the equipment und er test. The static pressure difference between the 
discharge chamber and intake opening of the equipment under test shall be zero. An example of the discharge 
chamber test set -up is shown in Figure D.1.  
 
D.2.2  Airflow measurements shall be made in accorda nce with the provisions specified in Annex B.  
 
NOTE  Additional guidance can be found in ISO 3966 and ISO 5167 -1, as appropriate and in the provisions of this annex.  
 
D.2.3  When conducting cooling or steady -state heating capacity tests using the indoor air enthalpy test 
method, the additional test tolerances given in Table D.1 shall apply.  
 
Table D.1 — Variations allowed during steady -state cooling and heating capacity  tests that 
only apply when using the indoor air enthalpy method  
 
Reading  Variation of arit hmetical  
mean values from specified  
test conditions  Variation of individual  readings from specified  
test conditions  
≤100 Pa  >100 Pa  ≤100 Pa  >100 Pa  
External static 
pressure (ESP)  ±0,5 Pa  ±5 %  ±0,10 Pa  ±10 %  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  41  
 
 
 
Key 
1 static pressure ta ppings  
2 equipment under test  
3 damper for fixed -duct resistance method  
4 external static pressure  
a To air sampler and airflow measuring apparatus.  
b J = 2De where 𝐷𝑒 =√4𝐴𝐵 𝜋⁄  and A and B are the dimensions of the 
equipment’s air outlet.  
c V2 is the average air velocity at PL.2.  
 
Figure D.1 — Discharge chamber requirements when using the indoor air enthalpy test method  
 
 
D.2.4  When  conducting transient heating capacity tests using the indoor air enthalpy test method, the 
additional test tolerances given in Table D.2 shall apply.  
 
When testing multi -split air conditioners and heat pumps, the dry -bulb temperature of air entering all indoor 
units or an outdoor unit shall be uniform within 0,5 K of the average.  
 
  
DKS 2463: 2018  
 
42                © KEBS 2018  — All rights reserved  Table D.2 — Variations allow ed during the transient heating tests that only apply when 
using the indoor air enthalpy test method  
Reading  Variation of arithmetical mean values 
from specified test conditions  Variation of individual readings 
from specified test conditions  
Interval Ha Interval Db Interval H a Interval D b 
External resistance 
to airflow  ±5 Pa  — ±5 Pa  — 
NOTE For transient heating tests, see 6.1.11 . 
a        Applies when the heat pump is in the heating mode, except for the first 10 min after termination of a 
defrost cycle.  
b       Applies during a defrost cycle and during the first 10 min after the termination of a defrost cycle when 
the heat pump is operating in the heating mode.  
 
D.3  Calculation of cooling capacity  
 
The total cooling capacity based on the indoor -side te st data, ϕtci, shall be calculated using Formula (D.1)  
 
∅𝑡𝑐𝑖=𝑞𝑣𝑖(ℎ𝑎1−ℎ𝑎2)
𝑣𝑛=𝑞𝑣𝑖(ℎ𝑎1−ℎ𝑎2)
𝑣′𝑛(1+𝑊𝑛)                                                                  (D.1)  
   
_ The sensible cooling capacity based  on the indoor -side test data, ϕsci, shall be calculated using Formula 
(D.2).  
 
∅𝑠𝑐𝑖=𝑞𝑣𝑖(𝑐𝑝𝑎1𝑡𝑎1−𝑐𝑝𝑎2𝑡𝑎2)
𝑣𝑛=𝑞𝑣𝑖(𝑐𝑝𝑎1𝑡𝑎1−𝑐𝑝𝑎2𝑡𝑎2)
𝑣′𝑛(1+𝑊𝑛)                                               (D.2)  
     
The latent cooling capacity based on the indoor -side test data, ϕd, shall be calculated using Formulae (D.3) 
and (D.4).  
 
∅𝑑=𝐾1𝑞𝑣𝑖(𝑊𝑖1−𝑊𝑖2)
𝑣𝑛=𝐾1𝑞𝑣𝑖(𝑊𝑖1−𝑊𝑖2)
𝑣′𝑛(1+𝑊𝑛)                                                                 (D.3)  
 
∅𝑑=∅𝑡𝑐𝑖−∅𝑠𝑐𝑖                                                                                             (D.4)  
 
D.4 Calculation of heating capacity  
 
Total heating capacity based on indoor -side data, ϕthi, shall be calculated using Formula (D.5).  
 
∅𝑠𝑐𝑖=𝑞𝑣𝑖(𝑐𝑝𝑎2𝑡𝑎2−𝑐𝑝𝑎1𝑡𝑎1)
𝑣𝑛=𝑞𝑣𝑖(𝑐𝑝𝑎2𝑡𝑎2−𝑐𝑝𝑎1𝑡𝑎2)
𝑣′𝑛(1+𝑊𝑛)                                                      (D.5)  
 
NOTE 1  Cpa1 can be equal to C pa2. 
 
NOTE 2  Formulae (D.1), (D.2), (D.3) and (D.5) do not provide allowance for heat leakage in the test duct and the discharge chamber. 
It is recommended to include correction for heat loss from receiving  chamber and/or connecting ducts.  
 
D.5 Airflow enthalpy measurements  
 
D.5.1  General  
 
The following test apparatus arrangements specified in D.5.2 to D.5.4 are recommended.  
 
D.5.2  Tunnel air enthalpy method  
 
The equipment to be tested is typically located in a test room or rooms. An air measuring device is attached 
to the equipment air discharge (indoor, outdoor or both, as applicable). This device discharges directly into the 
test room or space, which is provided with suitable means for maintaining the air  entering the equipment at the DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  43 desired wet - and dry -bulb temperatures (see Figure D.2 ). Suitable means for measuring the wet - and dry -bulb 
temperatures of the air entering and leaving the equipment and the external resistance shall be provided.  
 
 
 
 
 
 
 
Key 
 
1.  outdoor -side test room  7 door/window  
2.  outdoor unit of equipment under test  8 insulation  
3.  indoor -side coil section of equipment 
under test  9 indoor -side test room  
4.  air temperature and humidity measuring 
instruments  10 room conditioning apparatus  
5.  mixer 11 apparatus for differential pressure 
measurement  
6.  Airflow measuring apparatus  
  
 
 
Figure D.2 — Tunnel air enthalpy test method arrangement  
  
DKS 2463: 2018  
 
44                © KEBS 2018  — All rights reserved   
D.5.3  Loop air enthalpy method  
 
This arrangement differs from the tunnel arrangement in that the air measu ring device discharge is connected 
to suitable reconditioning equipment which is, in turn, connected to the equipment inlet (see Figure D.3). The 
resulting test “loop” shall be sealed so that air leakage at places that would influence capacity measurements  
does not exceed 1,0 % of the test airflow rate. The dry -bulb temperature of the air surrounding the equipment 
shall be maintained at within ±3,0 K of the desired test inlet dry -bulb temperature. Wet - and dry -bulb 
temperatures and external resistance shall  be measured by suitable means.  
 
 
 
 
 
 
 
Key 
 
1 outdoor -side test room  5 reconditioning apparatus  
2 outdoor unit of equipment under test  6 air flow measuring apparatus  
3 indoor unit of equipment under test  7 indoor -side test room  
4 temperature and humidi ty measuring 
instruments  8 apparatus for differential pressure 
measurement  
a                        Airflow.       
 
Figure D.3 — Loop air enthalpy test method arrangement  
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  45 D.5.4  Calorimeter air enthalpy method  
 
For equipment in which the compressor is v entilated independently of the indoor air stream, the calorimeter 
air enthalpy method arrangement shall be employed to take into account compressor heat radiation (see Figure 
D.4). In this arrangement, an enclosure is placed over the equipment, or applicab le part of the equipment, 
under test. This enclosure may be constructed of any suitable material, but shall be non -hydroscopic, shall be 
airtight and preferably insulated. It shall be large enough to permit inlet air to circulate freely between the 
equipme nt and the enclosures and in no case shall the enclosure be closer than 150 mm to any part of the 
equipment. The inlet to the enclosure shall be remotely located from the equipment’s inlet so as to cause 
circulation throughout the entire enclosed space. An  air measuring device is to be connected to the 
equipment’s discharge. This device shall be well insulated where it passes through the enclosed space. Wet - 
and dry -bulb temperatures of the air entering the equipment are to be measured at the enclosure inle t. 
Temperature and external resistance measurements shall be carried out by suitable means.  
 
 
 
Key 
 
1 outdoor -side test room  6 indoor -side coil section of equipment 
under test  
2 outdoor unit of equipment under test  7 enclosure  
3 air inlet  8 indoor -side test room  
4 air temperature and humidity 
measuring instruments  9 airflow measuring apparatus  
5 apparatus for differential pressure 
measurement  10 room conditioning apparatus  
a Airflow.    
 
Figure D.4 — Calorimeter air enthalpy test method arrangement  
 
 
DKS 2463: 2018  
 
46                © KEBS 2018  — All rights reserved  Annex E  
(informative)  
 
Refrigerant enthalpy test method  
 
E.1  General description  
 
E.1.1  In the refrigerant enthalpy test method, capacity is determined from the refrigerant enthalpy change 
and flow -rate. Enthalpy changes are determined from measurements of entering and leaving pressures and 
temperatures of the refrigerant, and the flow -rate is determined by a suitable flow meter in the liquid line.  
 
E.1.2  This method may be used for tests of equipment in which the refrigerant charge is not critical and 
where normal installation procedures involve the field connection of refrigerant lines.  
 
E.1.3  This method should neither be used for tests in which the refrigerant liquid leaving the flow meter is 
sub-cooled to less than 2,0 °C nor for tests in which the superheat of the vapour leaving the indoor -side is less 
than 3,0 °C.  
 
E.1.4  Cooling and heating capacities obtained by the refrigerant enthalpy method should include the 
thermal effects of the fan.  
 
E.2  Refrigerant flow method  
 
E.2.1  The refrigerant flow -rate should be measured with an integrating -type flow meter connected in the 
liquid line upstream of the refrigerant control device. This meter should be sized such that its pressure drop 
does not exceed the vapour pressure change that a 2,0 °C temperatur e change would produce.  
 
E.2.2  Temperature and pressure measuring instruments and a sight glass should be installed immediately 
downstream of the meter to determine if the refrigerant liquid is adequately subcooled. Sub -cooling of 2,0 °C 
and the absence of  any vapour bubbles in the liquid leaving the meter are considered adequate. It is 
recommended that the meter be installed at the bottom of a vertical downward loop in the liquid line to take 
advantage of the static head of the liquid thus provided.  
 
E.2.3  At the end of the test, a sample of the circulating refrigerant and oil mixture may be taken from the 
equipment and its concentration of oil, Xo, calculated using Formula (E.1) . 
 
 
𝑋𝑂=𝑊5−𝑊1
𝑊3−𝑊1                                                                                                               (E.1)  
 
The total indicated flow -rate should be corrected for the amount of oil circulating.  
 
E.3  Refrigerant  temperature and pressure measurements  
 
The temperature of refrigerant entering and leaving the indoor -side of the equipment should be measured with 
instruments having an accuracy of ±0,1 K. The pressure of refrigerant entering and leaving the indoor -side of 
the equipment should be measured with instruments having an accuracy of ±2,0 % of the indicated value.  
 
E.4  Calculation of cooling capacity  
 
Total cooling capacity, ϕtci, based on volatile refrigerant flow data is calculated using Formula (E.2) : 
 
 
∅𝑡𝑐𝑖=𝑥𝑟𝑞𝑟𝑜(ℎ𝑟2−ℎ𝑟1)−𝑃𝑖                                                                                                    (E.2)  
 
 
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  47 E.5  Calcula tion of heating capacity  
 
Total heating capacity, ϕthi, based on volatile refrigerant flow data is calculated using Formula (E.3) : 
 
∅𝑡ℎ𝑖=𝑥𝑟𝑞𝑟𝑜(ℎ𝑟1−ℎ𝑟2)+𝑃𝑖                                                                                     (E.3) 
 
  DKS 2463: 2018  
 
48                © KEBS 2018  — All rights reserved  Annex F  
(informative)  
 
Outdoor air enthalpy test method  
F.1  General  
 
F.1.1   In the air enthalpy test method, capacities are determined from measurements of entering and leaving 
wet-bulb and dry -bulb temperatures and the associated ai rflow rate.  
 
F.1.2   Outdoor air enthalpy tests are subject to the apparatus arrangement limitations specified in F.2.1. 
Additional provisions apply if the compressor is independently ventilated (see F.2.2). Line loss adjustment 
permitted by F.4.3 may be ma de if the equipment employs remote outdoor coils.  
 
F.2 Test room requirements  
 
F.2.1  When the air enthalpy method is employed for outdoor -side tests, it should be ascertained whether 
the attachment of the airflow measuring device changes the performance of  the equipment being tested and, 
if so, corrections should be made for this change (see Figure F.1). To accomplish this, the equipment should 
have thermocouples soldered to return bends at approximately the midpoints of each indoor coil and outdoor 
coil ci rcuit.  
 
Equipment not sensitive to refrigerant charge may, alternatively, be provided with pressure gauges connected 
to access valves or tapped into the suction and discharge lines. The equipment should then be operated at 
the desired conditions, with the indoor -side test apparatus connected, but not the outdoor -side apparatus. Data 
should be recorded at 10 -min intervals for a period of not less than one -half hour after equilibrium has been 
attained. The outdoor -side test apparatus should then be connected to the equipment and the pressure or 
temperatures indicated by the aforementioned gauges or thermocouples noted. If, after equilibrium is again 
attained, these do not average within ±0,3 K or its pressure equivalent of the averages observed during the 
preliminary test, the outdoor airflow rate should be adjusted until the specified agreement is attained.  
 
 The test should be continued for a period of one -half hour after attainment of equilibrium at the proper 
conditions with the outdoor test apparatus conne cted; the indoor -side test results during this interval should 
agree within ±  2,0 % with the results obtained during the preliminary test period. This applies for both the 
cooling and the heating cycle, but needs to be done at any one condition for each.  
 
F.2.2  For equipment in which the compressor is ventilated independently of the outdoor air stream, the 
calorimeter air enthalpy method arrangement should be employed to take into account compressor heat 
radiation (see Figure D.4).  
 
F.2.3  When the outdoor a irflow is adjusted as described in F.2.1, the adjusted air -flow rate is employed in 
the capacity calculation. In such cases, however, the outdoor fan power input observed during the preliminary 
tests should be used for rating purposes.  
 
When testing multi -split air conditioners and heat pumps, temperature of air entering all indoor units or an 
outdoor unit shall be within 0,5 K of the average.  
 
F.3 Testing conditions  
 
When the outdoor air enthalpy method is used, the requirements in 5.1.4.1.2 and 5.1.4.1.3  apply to both the 
preliminary test (see F.2.1) and the regular equipment test.  
 
 DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  49  
 
 
Key 
 
1 room conditioning apparatus  7 insulation  
2 outdoor -side test room  8 apparatus for differential pressure 
measurement  
3 airflow measuring apparatus  9 indoor -side coil section of equipment under 
test 
4 air temperature and humidity measuring 
instruments  10 door/window  
5 mixer  11 indoor -side test room  
6 outdoor unit of equipment under test    
 
Figure F.1 — Outdoor air enthalpy test method arrangement  
F.4  Calculati ons 
 
F.4.1  Total indoor cooling capacity based on outdoor -side data, ϕtco, is calculated using Formula ( F.1): 
 
∅𝑡𝑐𝑜=𝑞𝑣𝑜(𝑐𝑝𝑎4𝑡𝑎4−𝑐𝑝𝑎3𝑡𝑎3)
𝑣′𝑛(1+𝑊𝑛)−𝑃𝑡                                                                                               (F.1)  
 
F.4.2  Total heat capac ity based on outdoor -side data, ϕtho, is calculated using Formula (F.2):  
 
∅𝑡ℎ𝑜=𝑞𝑣𝑜(ℎ𝑎3−ℎ𝑎4)
𝑣′𝑛(1+𝑊𝑛)+𝑃𝑡                                                                                                      (F.2)  
 
DKS 2463: 2018  
 
50                © KEBS 2018  — All rights reserved  F.4.3  If line loss corrections are to be made, they should be included in the capacity calculations. Allowance 
should be made using Formula (F.3):  
∅𝐿=(1
𝑅1−𝑅2)𝐿(∆𝑡)                                                                                                                   (F.3)   
where  
𝑅1=𝑙𝑛(0.5𝐷𝑇+𝑇
0.5𝐷𝑇)
2𝜋𝜆=1
2𝜋𝜆𝑙𝑛(1+2Τ
𝐷Τ)                                                                                                  (F.4)  
𝑅2=1
𝜋(𝐵𝑇+2𝑇)𝛼𝑎                                                                                                                      (F.5)  
where  
Δt is the temperature difference between the inside and the outside of the tube;  
T is the thickness of the tubing ins ulation, in m;  
L is the length of refrigerant tubing, in m;  
λ is the thermal conductivity of the interconnecting tubing, in W/(m·K);  
αa is the heat transfer coefficient of the interconnecting tubing, in W/(m 2·K);  
R1, R2 is thermal resistance per un it length(K·m/W).  
 
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  51 Annex G  
(informative)  
 
Indoor calorimeter confirmative test method  
G.1  General  
 
G.1.1  This annex provides a method for confirming the test results when the cooling and heating capacities 
are determined by the indoor air enthalpy tes t method.  
 
G.1.2  In this test method, confirmation should be carried out in the test room specified in G.2, using the 
measuring method specified in G.3. 
 
G.2 Test room requirements  
 
A recommended test room is shown in Figure G. 1. This test room should be c onstructed such that the air 
enthalpy test apparatus is installed in the indoor -side test chamber of the calorimeter described in Annex C . 
The calorimeter should be of either the calibrated room -type or the balanced ambient room -type. The air 
enthalpy test  apparatus should be equipped with means of not only measuring airflow rate and enthalpies at 
the inlet and outlet of the equipment under test but also means for measuring the total power input to the air 
enthalpy test apparatus. It is recommended that air  leaving the air enthalpy test apparatus lead to the vicinity 
of the intake opening of the reconditioning apparatus of the calorimeter.  
 
G.3  Measurement  
 
G.3.1  Measurements should be carried out 1 h after the attainment of equilibrium conditions.  
 
G.3.2  Simultaneous measurements made by the calorimeter and the air enthalpy test apparatus should be 
made in accordance with the methods specified. Cooling capacity determined by measurements using the 
calorimeter should be calculated in accordance with Formula (C.1) and heating capacity should be calculated 
in accordance with Formula (C.7) . Likewise, cooling capacity determined by measurements with the air 
enthalpy test apparatus is calculated in accordance with Formula (D.1) and heating capacity in accordance 
with Formula (D.5) . 
 
  DKS 2463: 2018  
 
52                © KEBS 2018  — All rights reserved   
 
 
 
 
Key 
 
1 outdoor -side test chamber  7 fan 
2 equipment under test (outdoor unit)  8 humidifier  
3 air-sampling tube  9 heating coil  
4 equipment under test (indoor unit)  10 cooling coil  
5 airflow measuring apparatus  11 controlled -temperature air space  
6 mixer  12 indoor -side test chamber  
 
Figure G.1 — Indoor calorimeter confirmative test method arrangement  
 
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  53 Annex H  
(informative)  
 
Outdoor calorimeter confirmative test method  
H.1 General  
 
H.1.1  This annex provides a method for confi rming the test results when the cooling and heating capacities 
are determined by the indoor air enthalpy test method.  
 
H.1.2  In this test method, confirmation should be carried out in the test room specified in H.2, using the 
measuring method specified in H.3. 
 
H.2 Test room requirements  
 
The air enthalpy test apparatus in the indoor -side test chamber should be constructed in accordance with this 
document. The outdoor -side apparatus is the calorimeter, which should be constructed and equipped with the 
measu ring means described in Annex C . A recommended test room is shown in Figure H.1 . 
 
H.3  Measurement  
 
H.3.1   Measurements should be carried out 1 h after attainment of equilibrium conditions.  
 
H.3.2  Simultaneous measurements should be made using the air ent halpy apparatus on the indoor -side 
and the calorimeter on the outdoor -side in accordance with the methods specified. Cooling capacity 
determined by measurements using the calorimeter should be calculated in accordance with Formula (C.3) 
and heating capacit y should be calculated in accordance with Formula (C.8) . 
 
  DKS 2463: 2018  
 
54                © KEBS 2018  — All rights reserved   
 
 
 
Key 
 
1 controlled -temperature air space  7 mixer  
2 outdoor -side test chamber  8 equipment under test (outdoor unit)  
3 cooling coil  9 air-sampling tube  
4 heating coil  10 equipment under test (indoor unit)  
5 humidifier  11 airflow measuring apparatus  
6 fan 12 indoor -side test chamber  
 
 
Figure H.1 — Outdoor calorimeter confirmative test method arrangement  
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  55 Annex I  
(informative)  
 
Balanced -type calorimeter confirmative test method  
 
I.1  General  
 
I.1.1  This annex provides a method for manufacturers to confirm the test results when the cooling and 
heating capacities are determined by the indoor air enthalpy test method.  
 
This test method should not be used as a method of confirmation by testing l aboratories, because it does not 
provide for simultaneous confirmative test results.  
 
I.1.2  This method should be carried out by installing the equipment, which has been measured by the 
balanced -type calorimeter, in the indoor air enthalpy test apparatus for measurement under the same 
conditions as in the balanced -type calorimeter.  
 
I.1.3  The performance of the indoor air enthalpy apparatus should be verified at least every 12 months 
using an industry standard cooling/heating calibrating device. A calibra ting device may also be another piece 
of equipment for which the performance has been measured at an accredited national test laboratory as part 
of an industry -wide cooling/heating capacity verification programme.  
 
I.2  Measurement  
 
I.2.1  When this test m ethod is employed, it is desirable to confirm that there is no difference between the 
capacities measured by the calorimeter and the indoor air enthalpy test apparatus. To accomplish this, the 
equipment should have thermocouples soldered to the return bend s at approximately the midpoints of each of 
the indoor coil and outdoor coil circuits. Equipment not sensitive to refrigerant charge may, alternatively, be 
provided with the pressure gauges connected to access valves or tapped into the suction and discharg e lines.  
 
I.2.2  Firstly, the equipment to be tested should be installed in the balanced -type calorimeter described in 
Annex C to carry out the measurement of capacity. Then, the equipment should be moved to the indoor air 
enthalpy test apparatus and be me asured by the specified method. It is desirable to measure both cooling and 
heating capacities, though either may be measured. However, if the cooling capacity is measured by the 
calorimeter, the same measurement should also be made in the indoor air entha lpy test apparatus.  
 
I.2.3 If no alteration is made to the installation of the equipment under test, a series of tests conducted one 
immediately after the other should be deemed valid.  
 
  DKS 2463: 2018  
 
56                © KEBS 2018  — All rights reserved  Annex J  
(informative)  
 
Cooling condensate measurements  
J.1 General  
 
The latent cooling capacity should be determined from measurements of the condensate flow rate. The drain 
connection should be trapped to stabilize the condensate flow.  
 
J.2 Calculations  
 
J.2.1  The latent cooling capacity, ϕd, is calculated using Formula  (J.1): 
 
𝜙𝑑=𝐾1𝑞𝑤𝑐                                                                                                                     (J.1) 
 
J.2.2  The sensible cooling capacity, ϕsci, is then calculated using Formula (J.2) : 
 
ϕsci = ϕtci − ϕd                                                                                                    (J.2) 
 
 
 
 
 
 
  DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  57 Annex K  
(informative)  
 
Pictorial examples of the heating capacity test procedures given in 6.1  
 
K.1 General  
 
The six schematic diagrams given  in the examples shown in Figures K.2 to K.7 show several cases which 
could occur while conducting a heating capacity test as specified in 6.1. All examples show cases where a 
defrost cycle ends the preconditioning period. Figures K.2 to K.7 represent case s where the indoor air enthalpy 
method is used and, as a result, the data collection period for the transient test lasts 3 h or three complete 
cycles (as opposed to 6 h or six complete cycles if using the calorimeter test method).  
 
K.2 Procedure flow chart  for heating capacity test  
 
The following flow chart gives the procedures to be adopted and the clauses in the main text to be used when 
conducting the heating capacity test.  
 DKS 2463: 2018  
 
58                © KEBS 2018  — All rights reserved   
Figure K.1 — Procedure flow chart  
 
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  59  
 
Key 
 
1 compliance with test tolerances f irst achieved  
2 preconditioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period (3 h)  
6 difference in indoor air temperature, Δ tindoor air  
a Δt indoor air decreases by more tha n 2,5 % during the first 35 min of the data collection period.  
b Transient test. Terminate test when data collection period equals 3 h.  
 
Figure K.2 — Steady -state heating capacity test  
 
DKS 2463: 2018  
 
60                © KEBS 2018  — All rights reserved   
Key 
 
1 compliance with test tolerances first achieved  
2 precondit ioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period (3 h)  
6 difference in indoor air temperature, Δ t indoor air  
a Δtindoor air decreases by more than 2,5 % during the first 35 min of the data collection period.  
b Transient test. Terminate test when data collection period equals 3 h.  
 
Figure K.3 — Transient heati ng capacity test with no defrost cycles  
 
 
 
 
 
 
 
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  61  
 
 
 
 
 
 
Key 
 
1 compliance with test tolerances first achieved  
2 preconditioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period (3 h) 
6 difference in indoor air temperature, Δ tindoor air  
a Δtindoor air decreases by more than 2,5 % during the first 35 min of the data collection period.  
b Transient test. Terminate test when data collection period equals 3 h.  
 
 
Figure K.4 — Transient heati ng capacity test with one defrost cycle during the data 
collection period  
 
 
 
DKS 2463: 2018  
 
62                © KEBS 2018  — All rights reserved   
 
 
 
 
Key 
 
1 compliance with test tolerances first achieved  
2 preconditioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period (3 h)  
6 one complete defrost cycle  
a Transient test. Terminate test when data collection period equals 3 h.  
 
Figure K.5 — Transient heating capacity test with one complete cycle during the data 
collection period  
 
 
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  63  
 
 
 
 
Key 
1 compliance with test tolerances first achieved  
2 preconditioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period (3 h)  
6 two complete defrost cycle  
a Transient test. Terminate test when data collection period equals 3 h.  
 
Figure K.6 — Transient heating capacity test with two complete cycles during the data 
collection period  
  
DKS 2463: 2018  
 
64                © KEBS 2018  — All rights reserved   
 
 
Key 
1 compliance with test tolerances first achieved  
2 preconditioning period (10 min minimum)  
3 defrost at end of preconditioning period  
4 equilibrium period (60 min)  
5 data collection period  
6 three hours  
7 three complete defrost cycles  
a Transient test. Terminate test at the end of three complete cycles within the data collection 
period.  
 
 
Figure K.7 — Transient heating capacity test with three complete cycles during the data 
collection period  
 
  
DKS 2463: 2018  
 
© KEBS 2018  — All rights reserved                  65 Annex  L 
 (informative)  
 
A sample energy guide label  
 
 
Information required : 
 
a) manufacturer ;  
b) model; 
c) Energy Efficiency Ratio (Ee r); 
d) Energy Consumption  Kwh / Yr ; 
e) assumed 3  000 Hrs / Yr Operation ; 
f) actual consumption will depend on where the appliance is located and how it is used;  
g) cooling Capacity Kw ; 
h) refrigerant ; 
i) Kenya standard number.  
 
  
DKS 2463: 2018  
 
66                © KEBS 2018  — All rights reserved  Bibliography  
[1] ISO 3966, Measurement of fluid flow in closed co nduits — Velocity area method using Pitot static tubes  
[2] ISO 5167 -1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross -
section conduits running full — Part 1: General principles and requirements  
[3] ISO 13253,  Ducted air conditioners and air -to-air heat pumps — Testing and rating for performance  
[4] ISO 15042, Multiple split -system air conditioners and air -to-air heat pumps — Testing and rating for 
performance  
[5] ISO/TS 16491, Guidelines for the evaluation of uncertainty of measurement in air conditioner and heat 
pump cooling and heating capacity tests