EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 14511-1
May 2004
ICS 01.040.23; 23.120 Supersedes EN 255-1:1997, EN 814-1:1997, EN
12055:1998
English version
Air conditioners, liquid chilling packages and heat pumps with
electrically driven compressors for space heating and cooling -
Part 1: Terms and definitions
Climatiseurs, groupes refroidisseurs de liquide et pompes à
chaleur avec compresseur entraîné par moteur électrique
pour le chauffage et la réfrigération - Partie 1 : Termes et
définitions
Luftkonditionierer, Flüssigkeitskühlsätze und
Wärmepumpen mit elektrisch angetriebenen Verdichtern
für die Raumheizung und -kühlung - Teil 1: Begriffe
This European Standard was approved by CEN on 30 April 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 2004 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref. No. EN 14511-1:2004: E
EN 14511-1:2004 (E)
2
Contents
page
Foreword............................................................................................................................................................ 3
1 Scope .................................................................................................................................................... 4
2 Terms and definitions.......................................................................................................................... 4
3 Classification...................................................................................................................................... 10
Annex ZA (informative) Relationship of this document with EC Directives.............................................. 12
Bibliography .................................................................................................................................................... 13
EN 14511-1:2004 (E)
3
Foreword
This document (EN 14511-1:2004) has been prepared by Technical Committee CEN/TC 113 “Heat pumps
and air conditioning units”, the secretariat of which is held by AENOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by November 2004, and conflicting national standards shall be withdrawn
at the latest by November 2004.
This document supersedes EN 255-1:1997, EN 814-1:1997, EN 12055:1998.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
This standard consists of the following parts:
Part 1: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for
space heating and cooling - Part 1: Terms and definitions.
Part 2: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for
space heating and cooling - Part 2: Test conditions.
Part 3: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for
space heating and cooling - Part 3: Test methods.
Part 4: Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for
space heating and cooling - Part 4: Requirements.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
EN 14511-1:2004 (E)
4
1 Scope
This part of EN 14511 specifies the terms and definitions for the rating and performance of air and water cooled
air conditioners, liquid chilling packages, air-to-air, water-to-air, air-to-water and water-to-water heat pumps with
electrically driven compressors when used for space heating and/or cooling. This European Standard does not
specifically apply to heat pumps for sanitary hot water, although certain definitions can be applied to these.
This European Standard applies to factory-made units that can be ducted.
This standard applies to factory-made liquid chilling packages with integral condensers or for use with remote
condensers.
This standard applies to factory-made units of either fixed capacity or variable capacity by any means.
Packaged units, single split and multisplit systems are covered by this standard, except water cooled multisplit
systems.
In the case of units consisting of several parts, this standard applies only to those designed and supplied as a
complete package, except for liquid chilling packages with remote condenser.
This standard is primarily intended for water and brine chilling packages but can be used for other liquid subject to
agreement.
This standard applies to air-to-air air conditioners which evaporate the condensate on the condenser side.
The units having their condenser cooled by air and by the evaporation of external additional water are not
covered by this standard.
This standard does not apply to units using transcritical cycles, e.g. with CO2 as refrigerant.
Installations used for heating and/or cooling of industrial processes are not within the scope of this standard.
NOTE 1 Part load testing of units is dealt with in CEN/TS 14825.
NOTE 2 All the symbols given in this text should be used regardless of the language used.
2 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
2.1
air conditioner
encased assembly or assemblies designed as a unit to provide delivery of conditioned air to an enclosed
space (room for instance) or zone. It includes an electrically operated refrigeration system for cooling and
possibly dehumidifying the air.
It can have means for heating, circulating, cleaning and humidifying the air. If the unit provides heating by
reversing the refrigerating cycle then it is a heat pump
EN 14511-1:2004 (E)
5
2.2
heat pump
encased assembly or assemblies designed as a unit to provide delivery of heat. It includes an electrically
operated refrigeration system for heating.
It can have means for cooling, circulating, cleaning and dehumidifying the air. The cooling is by means of
reversing the refrigerating cycle
2.3
comfort air conditioner or heat pump
air conditioner or heat pump to satisfy the requirements of the occupants of the air conditioned room
2.4
close control air conditioner
air conditioner to satisfy the requirements of the process carried out in the air conditioned room
2.5
control cabinet air conditioner
air conditioner to satisfy the requirements of the control cabinet
2.6
packaged unit
factory assembly of components of refrigeration system fixed on a common mounting to form a discrete unit
2.7
single split unit
factory assembly of components of refrigeration system fixed on two mountings or more to form a discrete
matched functional unit
2.8
single-duct air conditioner
air conditioner for spot cooling in which the condenser intake air is introduced from the space containing the
unit and discharged outside this space
2.9
liquid chilling package
factory-made unit designed to cool liquid, using an evaporator, a refrigerant compressor, an integral or remote
condenser and appropriate controls.
It may have means for heating which can be reversing the refrigerating cycle, like a heat pump
2.10
heat recovery liquid chilling package
factory-made liquid chilling package designed for the purpose of chilling liquid and recovering of heat
2.11
heat recovery
recovery of heat rejected by the unit(s) whose primary control is in the cooling mode by means of either an
additional heat exchanger (e.g. a liquid chiller with an additional condenser) or by transferring the heat through
the refrigerating system for use to unit(s) whose primary control remains in the heating mode (e.g. variable
refrigerant flow)
2.12
indoor heat exchanger
heat exchanger which is designed to transfer heat to the indoor part of the building or to the indoor hot water
supplies or to remove heat from these
NOTE In the case of an air conditioner or heat pump operating in the cooling mode, this is the evaporator. In the case
of an air conditioner or heat pump operating in the heating mode, this is the condenser.
EN 14511-1:2004 (E)
6
2.13
outdoor heat exchanger
heat exchanger which is designed to remove heat from the outdoor ambient environment, or any other
available heat source, or to transfer heat to it
NOTE In the case of an air conditioner or heat pump operating in the cooling mode, this is the condenser. In the case
of an air conditioner heat pump operating in the heating mode, this is the evaporator.
2.14
heat recovery heat exchanger
heat exchanger assembly which is designed to transfer heat to the heat recovery medium
2.15
heat transfer medium
any medium (water, air, ...) used for the transfer of the heat without change of state. It can be:
¾ cooled liquid circulating in the evaporator;
¾ cooling medium circulating in the condenser;
¾ heat recovery medium circulating in the heat recovery heat exchanger
2.16
outdoor air
air introduced to the conditioned space through the unit from the outside
2.17
recycled air
air from the conditioned space through the unit and back to the conditioned space
2.18
exhaust air
air from the conditioned space through the unit to the outdoor side
2.19
water loop
closed circuit of water maintained within a temperature range on which the units in cooling mode reject heat
and the units in heating mode take heat
2.20
total cooling capacity
PC
heat given off from the heat transfer medium to the unit per unit of time, expressed in Watt
2.21
latent cooling capacity
PL
capacity of the unit for removing latent heat from the evaporator intake air, expressed in Watt
2.22
sensible cooling capacity
PS
capacity of the unit for removing sensible heat from the evaporator intake air, expressed in Watt
EN 14511-1:2004 (E)
7
2.23
heating capacity
PH
heat given off by the unit to the heat transfer medium per unit of time, expressed in Watt
NOTE If heat is removed from the indoor heat exchanger for defrosting, it is taken into account.
2.24
heat rejection capacity
heat removed by the heat transfer medium of the condenser per unit of time, expressed in Watt
NOTE This applies only to heat recovery liquid chilling packages.
2.25
heat recovery capacity
heat removed by the heat transfer medium of the heat recovery heat exchanger, per unit of time, expressed in
Watt
NOTE This applies only to heat recovery liquid chilling packages.
2.26
total power input
PT
power input of all components of the unit as delivered, expressed in Watt
2.27
effective power input
PE
average electrical power input of the unit within the defined interval of time obtained from:
¾ power input for operation of the compressor and any power input for defrosting;
¾ power input for all control and safety devices of the unit; and
¾ proportional power input of the conveying devices (e.g. fans, pumps) for ensuring the transport of the heat
transfer media inside the unit.
It is expressed in Watt
2.28
energy efficiency ratio
EER
ratio of the total cooling capacity to the effective power input of the unit, expressed in Watt/Watt
2.29
sensible heat ratio
SHR
ratio of the sensible cooling capacity to the total cooling capacity, expressed in Watt/Watt
2.30
coefficient of performance
COP
ratio of the heating capacity to the effective power input of the unit, expressed in Watt/Watt
2.31
operating range
range indicated by the manufacturer and limited by the upper and lower limits of use (e.g. temperatures, air
humidity, voltage) within which the unit is deemed to be fit for use and has the characteristics published by the
manufacturer
EN 14511-1:2004 (E)
8
2.32
rating conditions
standardised conditions provided for the determination of data which are characteristic for the unit, especially:
¾ heating capacity, power input, COP in heating mode;
¾ cooling capacity, power input, EER, SHR in cooling mode.
2.33
defrost mode
state of the unit in the heating mode where the operation is modified or reversed to defrost the outdoor heat
exchanger
2.34
defrost period
time for which the unit is in the defrost mode
2.35
operating cycle with defrost
cycle consisting of a heating period and a defrost period, from defrost termination to defrost termination
2.36
temperature of saturated vapour at the discharge of the compressor
temperature of saturated vapour/bubble point of the refrigerant corresponding to the discharge pressure of the
compressor, measured at the compressor/piping connection
2.37
temperature of the liquid refrigerant
temperature of the refrigerant measured at the inlet of the expansion device
2.38
glide
difference between dew point temperature and bubble point temperature at a given pressure
2.39
brine
heat transfer medium that has a freezing point depressed relative to water
2.40
sound power level
LW
ten times the logarithm to the base 10 of the ratio of the given sound power to the reference sound power
expressed in decibels. The reference sound power is 1 pW (10-12 W)
2.41
standard rating condition
mandatory condition that is used for marking and for comparison or certification purposes
2.42
application rating conditions
rating conditions which are mandatory if they fall within the operating range of the unit. Results based on
application rating conditions are published by the manufacturer or supplier
EN 14511-1:2004 (E)
9
2.43
basic multi-split system
split system incorporating a single refrigerant circuit, with one or more compressors, multiple indoor units
designed for individual operation and one outdoor unit. The system has no more than two steps of control by
either two compressors or by compressor unloading and is capable of operating either as an air-conditioner or
a heat pump. A system having a variable speed compressor where a fixed combination of indoor units is
specified by the manufacturer is also considered as a basic multi-split system
2.44
multiple circuit multi-split system
split system incorporating multiple refrigerant circuits, two or more single speed compressors, multiple indoor units
and an integrated heat exchanger in a single outdoor unit and is capable of operating either as an air conditioner
or a heat pump
2.45
modular multi-split system
split system air conditioner or heat pump incorporating a single refrigerant circuit, at least one variable speed
compressor or an alternative compressor combination for varying the capacity of the system by three or more
steps, multiple indoor units, each of which can be individually controlled, one or more outdoor units and is
capable of operating either as an air conditioner or a heat pump
2.46
modular heat recovery multi-split system
split system air conditioner or heat pump incorporating a single refrigerant circuit, at least one variable-speed
compressor or an alternate compressor combination for varying the capacity of the system by three or more
steps, multiple indoor units, each capable of being individually controlled and one or more outdoor units. This
system is capable of operating as a heat pump where recovered heat from the indoor units operating in the
cooling mode can be transferred to one or more units operating in the heating mode
NOTE This may be achieved by a gas/liquid separator or a third line in the refrigeration circuit.
2.47
rated capacity
capacity measured in the standard rating conditions
2.48
system capacity
capacity of the system when all outdoor and indoor units are operating in the same mode
2.49
system reduced capacity
capacity of the system when some of the indoor units are disconnected
2.50
system capacity ratio
ratio of the total stated cooling (heating) capacity of all operating indoor units to the stated cooling (heating)
capacity of the outdoor unit at the rating conditions
2.51
heat recovery efficiency
HRE
ratio of the total capacity of the system (heating plus cooling capacity) to the effective power input when
operating in the heat recovery mode
2.52
standard air
dry air at 20 °C and at standard barometric pressure of 101,325 kPa, having a mass density of 1,204 kg/m³
EN 14511-1:2004 (E)
10
3 Classification
The units are denominated in such a way that the heat transfer medium for the outdoor heat exchanger is
indicated first, followed by the heat transfer medium for the indoor heat exchanger (see Table 1).
Table 1 — Most common types of units
Heat transfer medium
Outdoor heat exchanger Indoor heat exchanger Classification
Air Air Air/air heat pump or air cooled air
conditioner
Water Air Water/air heat pump or water
cooled air conditioner
Brine Air Brine/air heat pump or brine
cooled air conditioner
Air Water Air/water heat pump or air cooled
liquid chilling package
Water Water Water/water heat pump or water
cooled liquid chilling package
Brine Water Brine/water heat pump or brine
cooled chilling package
EN 14511-1:2004 (E)
11
Index
A
air conditioner .......................................................... 2.1
application rating conditions ................................ 2.42
B
basic multi-split system......................................... 2.43
brine ........................................................................ 2.39
C
close control air conditioner ................................... 2.4
coefficient of performance, COP........................... 2.30
comfort air conditioner or heat pump .................... 2.3
control cabinet air conditioner................................ 2.5
D
defrost mode .......................................................... 2.33
defrost period ......................................................... 2.34
E
effective power input, PE ....................................... 2.27
energy efficiency ratio, EER.................................. 2.28
exhaust air .............................................................. 2.18
G
glide......................................................................... 2.38
H
heat pump................................................................. 2.2
heat recovery.......................................................... 2.11
heat recovery capacity........................................... 2.25
heat recovery efficiency, HRE............................... 2.51
heat recovery heat exchanger............................... 2.14
heat recovery liquid chilling package................... 2.10
heat rejection capacity........................................... 2.24
heat transfer medium............................................. 2.15
heating capacity, PH ............................................... 2.23
I
indoor heat exchanger........................................... 2.12
L
latent cooling capacity, PL ..................................... 2.21
liquid chilling package............................................. 2.9
M
modular heat recovery multi-split system............ 2.46
modular multi-split system.................................... 2.45
multiple circuit multi-split system ........................ 2.44
O
operating cycle with defrost.................................. 2.35
operating range ...................................................... 2.31
outdoor air .............................................................. 2.16
outdoor heat exchanger......................................... 2.13
P
packaged unit ........................................................... 2.6
R
rated capacity ......................................................... 2.47
rating conditions .................................................... 2.32
recycled air ............................................................. 2.17
S
sensible cooling capacity, PS ................................ 2.22
sensible heat ratio, SHR ........................................ 2.29
single split unit ......................................................... 2.7
single-duct air conditioner ...................................... 2.8
sound power level, LW............................................ 2.40
standard air............................................................. 2.52
standard rating condition ...................................... 2.41
system capacity...................................................... 2.48
system capacity ratio ............................................. 2.50
system reduced capacity....................................... 2.49
T
temperature of saturated vapour at the discharge of
the compressor.................................................... 2.36
temperature of the liquid refrigerant .................... 2.37
total cooling capacity, PC....................................... 2.20
total power input, PT............................................... 2.26
W
water loop ............................................................... 2.19
EN 14511-1:2004 (E)
12
Annex ZA
(informative)
Relationship of this document with EC Directives
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association and supports essential requirements of EC Directive:
Energy Labelling Directive 02/31/EC
WARNING : Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.
Compliance with the clauses of this standard provides one means of conforming with the specific essential
requirements of the Directive concerned and associated EFTA regulations.
EN 14511-1:2004 (E)
13
Bibliography
[1] CEN/TS 14825, Air conditioners, liquid chilling packages and heat pumps with electrically driven
compressors for space heating and cooling ? Testing and rating at part load conditions.

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