SIST EN 14511-3:2004
(Main)Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling - Part 3: Test methods
Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling - Part 3: Test methods
This part of EN 14511 specifies the test methods 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 cooling.
It also specifies the method of testing and reporting for heat recovery capacities, system reduced capacities and the capacity of individual indoor units of multisplit systems, where applicable.
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, the 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.
Luftkonditionierer, Flüssigkeitskühlsätze und Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumheizung und -kühlung - Teil 3: Prüfverfahren
Dieser Teil der EN 14511 legt die Prüfverfahren für die Einstufung und Leistung von luft- und wassergekühlten Luftkonditionierern, Flüssigkeitskühlsätzen, Luft/Luft-, Wasser/Luft-, Luft/Wasser- und Wasser/Wasser-
Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumheizung und -kühlung fest.
Er legt ferner Verfahren fest zur Prüfung und Angabe von Wärmerückgewinnungsleistungen, systemreduzierten Leistungen sowie der Leistung von Einzelgeräten von Multi-Split-Systemen für die Aufstellung im Innenraum, soweit zutreffend.
Diese Europäische Norm gilt für fabrikmäßig zusammengebaute Geräte, die mit Luftkanälen versehen sein können.
Diese Norm gilt für fabrikmäßig zusammengebaute Flüssigkeitskühlsätze, die mit eingebauten Verflüssigern oder mit getrennt angeordneten Verflüssigern betrieben werden.
Diese Norm gilt für fabrikmäßig zusammengebaute Geräte mit fest eingestellter oder durch beliebige Vorrichtungen zu verändernder Leistung (variable Leistung).
Kompaktgeräte, Einzelgeräte in Split-Bauweise und Multi-Split-Systeme fallen unter den Anwendungsbereich dieser Norm, ausgenommen sind wassergekühlte Multi-Split-Systeme.
Wenn die Geräte aus mehreren Teilen bestehen, gilt diese Norm mit der Ausnahme von Flüssigkeitskühl-sätzen mit getrennt angeordnetem Verflüssiger nur für die Teile, die als vollständige Baueinheit konstruiert und geliefert werden.
Diese Norm gilt hauptsächlich für Wasser- und Solekühlsätze, kann jedoch bei Vereinbarung auf weitere Flüssigkeitskühlsätze angewendet werden.
Diese Norm gilt für Luft/Luft-Luftkonditionierer, die das Kondensat auf der Verflüssigerseite verdampfen.
Geräte, deren Verflüssiger durch Belüftung und durch Verdampfung von zusätzlichem, von außen zuge-führtem Wasser abgekühlt wird, werden in dieser Norm nicht behandelt.
Diese Norm gilt nicht für Geräte, bei denen, z. B. mit CO2 als Kältemittel, der Kreisprozess transzyklisch betrieben wird.
Climatiseurs, groupes refroidisseurs de liquide et pompes a chaleur avec compresseur entraîné par moteur électrique pour le chauffage et la réfrigération - Partie 3: Méthodes d'essai
La présente partie de l'EN 14511 spécifie les méthodes d'essai relatives la détermination des caractéristiques de performance des climatiseurs a condensation par air et a condensation par eau, des groupes refroidisseurs de liquide et des pompes a chaleur air/air, eau/air, air/eau et eau/eau, avec compresseur entraîné par moteur électrique, lorsqu'ils sont utilisés pour le chauffage et/ou la réfrigération des locaux.
Elle spécifie aussi la méthode d'essai et de rapport pour les puissances calorifiques de récupération, les puissances réduites de systeme et la puissance individuelle des unités intérieures des systemes multi-split, le cas échéant.
La présente norme s'applique aux appareils fabriqués en usine, qui peuvent etre raccordés.
La présente norme s'applique aux groupes refroidisseurs de liquide fabriqués en usine autonomes ou conçus pour fonctionner avec des condenseurs fournis séparément.
La présente norme s'applique aux appareils fabriqués en usine de capacité fixe ou variable par tous moyens.
La présente norme couvre les systemes monoblocs, a deux éléments séparés et multi-split, excepté les systemes multi-split refroidis par eau.
Dans le cas d'appareils a éléments séparés, la présente Norme ne s'applique qu'aux appareils conçus et fournis comme un ensemble, sauf pour ce qui concerne les groupes refroidisseurs de liquide avec condenseur séparé.
La présente norme est principalement destinée aux groupes refroidisseurs d'eau et d'eau glycolée mais peut etre utilisée, apres accord, pour d'autres liquides.
La présente norme s'applique aux climatiseurs air/air qui évaporent les condensats du côté du condenseur.
La présente norme ne couvre pas les appareils ayant leur condenseur refroidi par air et par évaporation d'eau d'un circuit supplémentaire externe.
La présente Norme ne couvre pas les appareils utilisant des cycles transcritiques, par exemple avec CO2 comme fluide frigorigene.
Klimatske naprave, enote za tekočinsko hlajenje in toplotne črpalke z električnimi kompresorji za segrevanje in hlajenje prostora – 3. del: Preskusne metode
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luftkonditionierer, Flüssigkeitskühlsätze und Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumheizung und -kühlung - Teil 3: PrüfverfahrenClimatiseurs, groupes refroidisseurs de liquide et pompes a chaleur avec compresseur entraîné par moteur électrique pour le chauffage et la réfrigération - Partie 3: Méthodes d'essaiAir conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling - Part 3: Test methods91.140.30VLVWHPLVentilation and air-conditioning27.080Heat pumps23.120QDSUDYHVentilators. Fans. Air-conditionersICS:Ta slovenski standard je istoveten z:EN 14511-3:2004SIST EN 14511-3:2004en01-september-2004SIST EN 14511-3:2004SLOVENSKI
STANDARDSIST EN 814-2:2001SIST EN 255-2:2001SIST EN 12055:20011DGRPHãþD
SIST EN 14511-3:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14511-3May 2004ICS 23.120Supersedes EN 12055:1998, EN 255-2:1997, EN 814-2:1997English versionAir conditioners, liquid chilling packages and heat pumps withelectrically driven compressors for space heating and cooling -Part 3: Test methodsClimatiseurs, groupes refroidisseurs de liquide et pompes àchaleur avec compresseur entraîné par moteur électriquepour le chauffage et la réfrigération - Partie 3: Méthodesd'essaiLuftkonditionierer, Flüssigkeitskühlsätze undWärmepumpen mit elektrisch angetriebenen Verdichternfür die Raumheizung und -kühlung - Teil 3: PrüfverfahrenThis 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 EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14511-3:2004: ESIST EN 14511-3:2004
EN 14511-3:2004 (E)2ContentspageForeword.41Scope.52Normative references.53Terms and definitions.54Rating capacity test.64.1Basic principles.64.1.1Heating capacity.64.1.2Cooling capacity.64.1.3Heat recovery capacity.74.1.4Power input of fans for units without duct connection.74.1.5Power input of fans for units with duct connection.84.1.6Power input of liquid pumps.84.1.7Units for use with remote condenser.94.2Test apparatus.94.2.1Arrangement of the test apparatus.94.2.2Installation and connection of the test object.104.3Uncertainties of measurement.114.4Test procedure.124.4.1General.124.4.2Output measurement for water-to-water and water-to-air units.144.4.3Output measurement for cooling capacity of air-to-water and air-to-air units.144.4.4Output measurement for heating capacity of air-to-water and air-to-air units.154.5Test results.174.5.1Data to be recorded.174.5.2Cooling capacity and heat recovery capacity calculation.194.5.3Heating capacity calculation.194.5.4Effective power input calculation.205Heat recovery test for multisplit systems.205.1Test installation.205.1.1General.205.1.2Three-room calorimeter method.205.1.3Three-room air-enthalpy method.205.1.4Two-room air-enthalpy method.215.2Test procedure.215.3Test results.216Test report.216.1General information.216.2Additional information.226.3Rating test results.22Annex A (normative)
Calorimeter test method.23A.1General.23A.2Transient heating capacity test.26A.3Calibrated room-type calorimeter.26A.4Balanced ambient room-type calorimeter.27A.5Calorimeter and auxiliary equipment for water-cooled condenser tests.27A.6Calculations-cooling capacities.27SIST EN 14511-3:2004
EN 14511-3:2004 (E)3A.6.1General.27A.7Calculation-heating capacities.29A.7.1General.29Annex B (normative)
Indoor air enthalpy test method.31B.1General.31B.2Application.31B.3Calculations-cooling capacities.31B.4Calculations-heating capacities.32Annex C (informative)
Heating capacity tests. Flow chart and examples of different testsequences.33Annex D (informative)
Conformance criteria.37D.1Liquid chilling packages.37D.2Calorimeter room method.37D.3Heat recovery of multisplit systems.37Annex E (informative)
Symbols used in annexes.38Annex F (informative)
Test at system reduced capacity ratio.40F.1General.40F.2Selection of units.40F.3Temperature conditions.40F.4Test results.40Annex G (informative)
Individual unit tests.41G.1General.41G.1.1Methods.41G.1.2Calorimeter method.41G.1.3Air-enthalpy method.41G.2Temperatures conditions.41G.3Other test conditions.41G.4Test results.41G.5Published results.42Annex ZA (informative)
Relationship of this document with EC Directives.43Bibliography.44SIST EN 14511-3:2004
EN 14511-3:2004 (E)4ForewordThis document (EN 14511-3:2004) has been prepared by Technical Committee CEN/TC 113 “Heat pumpsand 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 identicaltext or by endorsement, at the latest by November 2004, and conflicting national standards shall be withdrawnat 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 theEuropean 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 forspace heating and cooling - Part 1: Terms and definitions.Part 2:Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors forspace heating and cooling - Part 2: Test conditions.Part 3:Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors forspace heating and cooling - Part 3: Test methods.Part 4:Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors forspace heating and cooling - Part 4: Requirements.Annexes A and B are normative and annexes C, D, E, F and G are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries 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, Switzerlandand United Kingdom.SIST EN 14511-3:2004
EN 14511-3:2004 (E)51 ScopeThis part of EN 14511 specifies the test methods for the rating and performance of air and water-cooled airconditioners, liquid chilling packages, air-to-air, water-to-air, air-to-water and water-to-water heat pumps withelectrically driven compressors when used for space heating and cooling.It also specifies the method of testing and reporting for heat recovery capacities, system reduced capacities andthe capacity of individual indoor units of multisplit systems, where applicable.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 remotecondensers.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 multisplitsystems.In the case of units consisting of several parts, the standard applies only to those designed and supplied as acomplete 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 toagreement.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 notcovered 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 1Part load testing of units is dealt with in CEN/TS 14825.NOTE 2All the symbols given in this text should be used regardless of the language used.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text, and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications apply tothis European Standard only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies (including amendments).EN 14511-1;2004, Air conditioners, liquid chilling packages and heat pumps with electrically drivencompressors for space heating and cooling – Part 1: Terms and definitions.EN 14511-2:2004, Air conditioners, liquid chilling packages and heat pumps with electrically drivencompressors for space heating and cooling – Part 2: Test conditions.3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in EN 14511-1:2004 apply.SIST EN 14511-3:2004
EN 14511-3:2004 (E)64 Rating capacity test4.1 Basic principles4.1.1 Heating capacityThe heating capacity of air conditioners and of air-to-air or water-to-air heat pumps shall be determined bymeasurements in a calorimeter room or by the air enthalpy method which are described in annex A and annex Brespectively.The heating capacity of air-to-water, water-to-water heat pumps and liquid chilling packages shall be determinedin accordance with the direct method at the water or brine heat exchanger, by determination of the volume flow ofthe heat transfer medium, and the inlet and outlet temperatures, taking into consideration the specific heatcapacity and density of the heat transfer medium.For steady state operation, the heating capacity shall be determined using the following formula:tcqPpHD´´=r(1)wherePH
is the heat capacity, in Watts;qis the volume flow rate, in cubic metres per second;ris the density, in kilograms per cubic metre;cpis the specific heat at constant pressure, in joules per kilogram and kelvin;Dtis the difference between inlet and outlet temperatures, in kelvin.For the heating capacity calculation in transient operation, refer to 4.5.3.2.The heating capacity shall be corrected for the heat from the fan or pump:-if the fan or pump at the indoor heat exchanger is an integral part of the unit, the same power (calculatedin 4.1.5.1 or 4.1.6.1) which is excluded from the total power input shall be also subtracted from theheating capacity;-If the fan or pump at the indoor heat exchanger is not an integral part of the unit, the same power(calculated in 4.1.5.2 or 4.1.6.2) which is included in the effective power input shall be also added to theheating capacity.4.1.2 Cooling capacityThe cooling capacity of air conditioners and of air-to-air or water-to-air heat pumps shall be determined bymeasurements in a calorimeter room or by the air enthalpy method which are described in annex A and annex Brespectively.The cooling capacity of air-to-water, water-to-water heat pumps and liquid chilling packages shall be determinedin accordance with the direct method at the water or brine heat exchanger, by determination of the volume flow ofthe heat transfer medium, and the inlet and outlet temperatures, taking into consideration the specific heatcapacity and density of the heat transfer medium.The cooling capacity shall be determined using the following formula:SIST EN 14511-3:2004
EN 14511-3:2004 (E)7tcqPpCD´´=r(2)wherePCis the cooling capacity, in Watts;qis the volume flow rate, in cubic metres per second;ris the density, in kilograms per cubic metre;cpis the specific heat at constant pressure, in joules per kilogram and kelvin;Dtis the difference between inlet and outlet temperatures, in kelvin.The cooling capacity shall be corrected for the heat from the fan or pump:a) If the fan or pump at the evaporator is an integral part of the unit, the same power (calculated in 4.1.5.1 or4.1.6.1) which is excluded from the total power input is also added to the cooling capacity.b) If the fan or pump at the evaporator is not an integral part of the unit, the same power (calculated in4.1.5.2 or 4.1.6.2) which is included in the effective power input is also subtracted from the coolingcapacity.4.1.3 Heat recovery capacityThe heat recovery capacity of air-to-water and water-to-water heat pumps and liquid chilling packages shall bedetermined in accordance with the direct method at the water or brine heat exchanger, by determination of thevolume flow of the heat transfer medium, and the inlet and outlet temperatures, taking into consideration thespecific heat capacity and density of the heat transfer medium.The heat recovery capacity shall be determined using the following formula:tcqPpHRD´´´=r(3)wherePHRis the heat recovery capacity, in Watts;qis the volume flow rate, in cubic metres per second;ris the density, in kilograms per cubic metre;cpis the specific heat at constant pressure, in joules per kilogram and kelvin;Dtis the difference between inlet and outlet temperatures in kelvin.4.1.4 Power input of fans for units without duct connectionIn the case of units which are not designed for duct connection, i.e. which do not permit any external pressuredifferences, and which are equipped with an integral fan, the power absorbed by the fan shall be included in theeffective power absorbed by the unit.SIST EN 14511-3:2004
EN 14511-3:2004 (E)84.1.5 Power input of fans for units with duct connection4.1.5.1If a fan is an integral part of the unit, only a fraction of the input of the fan motor shall be includedin the effective power absorbed by the unit. The fraction that is to be excluded from the total power absorbedby the unit shall be calculated using the following formula:hepqD´ [W](4)wherehis 0,3 by convention;Dpeis the measured available external static pressure difference, in Pascals;qis the nominal air flow rate, in cubic meters per second.4.1.5.2If no fan is provided with the unit, the proportional power input which is to be included in theeffective power absorbed by the unit, shall be calculated using the following formula:hipqD´ [W](5)wherehis 0,3 by convention;Dpiis the measured internal static pressure difference, in Pascals;qis the nominal air flow rate, in cubic meters per second.4.1.6 Power input of liquid pumps4.1.6.1If a liquid pump is an integral part of the unit, only a fraction of the input to the pump motor shallbe included in the effective power absorbed by the unit. The fraction which is to be excluded from the totalpower absorbed by the unit shall be calculated using the following formula:hepqD´ [W](6)wherehis 0,3 by convention;Dpeis the measured available external static pressure difference, in Pascals;qis the nominal water flow rate, in cubic meters per second.4.1.6.2If no liquid pump is provided with the unit, the proportional power input which is to be included inthe effective power absorbed by the unit, shall be calculated using the following formula:hipqD´ [W](7)SIST EN 14511-3:2004
EN 14511-3:2004 (E)9wherehis 0,3 by convention;Dpiis the measured internal static pressure difference, in Pascals;qis the nominal water flow rate, in cubic meters per second.4.1.6.3In the case of appliances designed especially to operate on a distributing network of pressurisedwater without water-pump, no correction is to be applied to the power input.4.1.7 Units for use with remote condenserThe power from the auxiliary liquid pump of the remote condenser shall not be taken into account in theeffective power input.4.2 Test apparatus4.2.1 Arrangement of the test apparatus4.2.1.1 General requirementsThe test apparatus shall be designed in such a way that all requirements on adjustment of set values, stabilitycriteria and uncertainties of measurement according to this European Standard can be fulfilled.4.2.1.2 Test room for the air sideThe size of the test room shall be selected such that any resistance to air flow at the air inlet and air outlet orificesof the test object is avoided. The air flow through the room shall not be capable of initiating any short circuitbetween these two orifices, and therefore the velocity of the air flows through the room at these two locations shallnot exceed 1,5 m/s when the test object is switched off. The air velocity in the room shall also not be greater thanthe mean velocity through the unit inlet. Unless otherwise stated by the manufacturer, the air inlet or air outletorifices shall be not less than 1 m distant from the surfaces of the test room.Any direct heat radiation by heating units in the test room onto the unit or onto the temperature measuring pointsshall be avoided.4.2.1.3 Appliances with duct connectionDucted air systems shall be sufficiently air tight to ensure that the measured results are not significantly influencedby exchange of air with the surroundings.4.2.1.4 Appliances with integral pumpsFor appliances with integral and adjustable water or brine pumps, the external static pressure will be set at thesame time as the temperature difference.4.2.1.5 Liquid chilling package for use with remote condenserUnits for use with remote condenser are tested by using a water-cooled condenser, the characteristics ofwhich shall enable the intended operating conditions to be achieved.SIST EN 14511-3:2004
EN 14511-3:2004 (E)104.2.2 Installation and connection of the test object4.2.2.1 GeneralThe test object shall be installed and connected for the test as recommended by the manufacturer in hisinstallation and operation manual. The accessories provided by option (for example heating element) are notincluded in the test.For single duct units, in case the manufacturer's instructions do not specify how to install the discharge duct,the following recommendations shall apply.The discharge duct shall be as short and straight as possible compatibly with minimum distance between theunit and the wall for correct air inlet to the unit. The installation of the unit shall be such that any bend of thedischarge duct is avoided.For multisplit systems, the test shall be performed with the system operating at a capacity ratio of 1, or as close aspossible.When performing measures in heating mode, set the highest room temperature on the unit/system controldevice; when performing measures in cooling mode, set the lowest room temperature on the unit/systemcontrol device.For unit with open-type compressor the electric motor shall be supplied or specified by the manufacturer. Thecompressor shall be operated at the rotational speed specified by the manufacturer.For inverter type control units, if the manufacturer gives instructions for the setting of the frequency for eachrating condition, this setting shall be done.NOTETo set up a multisplit system which incorporates an inverter-controlled compressor, skilled personnel with aknowledge of control software will be required. The manufacturer or his nominated agent should be in attendance whenthe system is being installed and prepared for tests.4.2.2.2 Installation of unit consisting of several partsIn the case of a unit consisting of several parts, the following installation conditions shall be complied with for thetest.a) The refrigerant lines shall be installed in accordance with the manufacturer instructions with a minimumlength of 5 m and a greater length to a maximum of 7,5 m if the constraints of the test installation make5 m not possible.b) The lines shall be installed so that the difference in elevation does not exceed 2,5 m.c) The thermal insulation of the lines shall be applied in accordance with the manufacturer's instructions.d) Unless constrained by the design, at least half of the connecting lines shall be exposed to the outsideconditions, with the rest of the lines exposed to the inside conditions.4.2.2.3 Indoor units of multisplit systemsWhen testing a multisplit system, indoor units shall be either all non ducted or all ducted.If they are ducted, all indoor units shall be of the same model, i.e. having the same airflow rate and the sameexternal static pressure.In case of equipment with non ducted ind
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