Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling - Part 3: Test methods

1.1   The scope of EN 14511-1:2013 is applicable.
1.2   This European Standard specifies the test methods for the rating and performance of air conditioners, liquid chilling packages and heat pumps using either air, water or brine as heat transfer media, 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 also makes possible to rate multisplit and modular heat recovery multisplit systems by rating separately the indoor and outdoor units.

Luftkonditionierer, Flüssigkeitskühlsätze und Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumbeheizung und -kühlung - Teil 3: Prüfverfahren

1.1   Es gilt der Anwendungsbereich von EN 14511 1.
1.2   Diese Europäische Norm legt die Prüfverfahren für die Bemessung und Leistung von Luft-konditionierern, Flüssigkeitskühlsätzen und Wärmepumpen, die Luft, Wasser oder Sole als Wärmeträger nutzen, mit elektrisch angetriebenen Verdichtern für die Raumbeheizung und -kühlung fest.
Sie legt weiterhin ein Verfahren fest zur Prüfung und Angabe von Wärmerückgewinnungsleistungen, system-reduzierten Leistungen sowie der Leistung von Einzelgeräten von Multi-Split-Systemen für die Aufstellung im Innenraum, soweit zutreffend.
Diese Europäische Norm bietet außerdem die Möglichkeit, die Leistung von Multi-Split-Systemen und modularen Multi-Split-Systemen mit Wärmerückgewinnung durch getrennte Leistungsbemessung von Geräten für die Aufstellung im Innenraum und Geräten für die Außenaufstellung (Innen- und Außengeräte) zu bemessen.

Climatiseurs, groupes refroidisseurs de liquide et pompes à chaleur avec compresseur entraîné par moteur électrique pour le chauffage et la réfrigération des locaux - Partie 3: Méthodes d'essai

1.1   Le domaine d'application de l’EN 14511-1 est applicable.
1.2   La présente Norme européenne spécifie les méthodes d'essai pour la détermination des caractéristiques de performance des climatiseurs, groupes refroidisseurs de liquide et pompes à chaleur utilisant l’air, l’eau ou l’eau glycolée comme fluide caloporteur, avec compresseur entraîné par moteur électrique, lorsqu'ils sont utilisés pour le chauffage et le refroidissement des locaux.
Elle spécifie aussi la méthode d'essai et de rapport pour les puissances calorifiques de récupération, les puissances réduites de système et la puissance individuelle des unités intérieures des systèmes multi-split, le cas échéant.
La présente Norme européenne permet également de déterminer les caractéristiques des systèmes multi-split et des systèmes multi-split modulaires à récupération de chaleur en considérant les appareils intérieurs et extérieurs séparément.

Klimatske naprave, enote za tekočinsko hlajenje in toplotne črpalke z električnimi kompresorji za segrevanje in hlajenje prostora - 3. del: Preskusne metode

Ta evropski standard določa preskusne metode za ocenjevanje in delovanje klimatskih naprav, enot za tekočinsko hlajenje in toplotnih črpalk, ki uporabljajo zrak, vodo ali slanico kot medij za prenos toplote, z električnimi kompresorji, kadar se uporabljajo za segrevanje in hlajenje prostora. Določa tudi metodo za preskušanje in sporočanje zmogljivosti vračanja toplote, zmanjšanih sistemskih zmogljivosti in zmogljivosti posameznih notranjih enot sistemov z več razcepi, kjer je to primerno. Ta evropski standard omogoča tudi oceno sistemov z več razcepi in modularnih sistemov z več razcepi za vračanje toplote z ločeno oceno notranjih in zunanjih enot.

General Information

Status
Withdrawn
Publication Date
30-Jul-2013
Withdrawal Date
13-Mar-2018
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
14-Mar-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luftkonditionierer, Flüssigkeitskühlsätze und Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumbeheizung und -kühlung - Teil 3: PrüfverfahrenClimatiseurs, groupes refroidisseurs de liquide et pompes à chaleur avec compresseur entraîné par moteur électrique pour le chauffage et la réfrigération des locaux - 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 14511-3:2013SIST EN 14511-3:2013en,fr,de01-december-2013SIST EN 14511-3:2013SLOVENSKI

STANDARDSIST EN 14511-3:20121DGRPHãþD
SIST EN 14511-3:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14511-3
July 2013 ICS 27.080; 91.140.30 Supersedes EN 14511-3:2011English Version

Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling - Part 3: Test methods

Climatiseurs, groupes refroidisseurs de liquide et pompes à chaleur avec compresseur entraîné par moteur électrique pour le chauffage et la réfrigération des locaux - Partie 3: Méthodes d'essai

Luftkonditionierer, Flüssigkeitskühlsätze und Wärmepumpen mit elektrisch angetriebenen Verdichtern für die Raumbeheizung und -kühlung - Teil 3: PrüfverfahrenThis European Standard was approved by CEN on 7 June 2013.

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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14511-3:2013: ESIST EN 14511-3:2013

EN 14511-3:2013 (E) 2 Contents Page Foreword ..............................................................................................................................................................3 1 Scope ......................................................................................................................................................4 2 Normative references ............................................................................................................................4 3 Terms and definitions ...........................................................................................................................4 4 Rating capacity test ...............................................................................................................................4 4.1 Basic principles method of calculation for the determination of capacities ...................................4 4.2 Test apparatus .......................................................................................................................................8 4.3 Uncertainties of measurement .......................................................................................................... 10 4.4 Test procedure .................................................................................................................................... 12 4.5 Test results .......................................................................................................................................... 19 5 Electrical consumptions for single duct and double duct units .................................................... 22 5.1 Determination of power consumption due to standby mode ........................................................ 22 5.2 Determination of power consumption in off-mode ......................................................................... 23 5.3 Electricity consumption ..................................................................................................................... 23 6 Air flow rate measurement of ducted units ...................................................................................... 23 7 Heat recovery test for air-cooled multisplit systems ...................................................................... 23 7.1 Test installation ................................................................................................................................... 23 7.2 Test procedure .................................................................................................................................... 24 7.3 Test results .......................................................................................................................................... 24 8 Test report ........................................................................................................................................... 24 8.1 General information ............................................................................................................................ 24 8.2 Additional information ....................................................................................................................... 25 8.3 Rating test results............................................................................................................................... 25 Annex A (normative)

Calorimeter test method ............................................................................................. 26 Annex B (normative)

Indoor air enthalpy test method ................................................................................. 35 Annex C (informative)

Heating capacity tests - Flow chart and examples of different test sequences ........................................................................................................................................... 36 Annex D (informative)

Conformance criteria ................................................................................................. 42 Annex E (informative)

Symbols used in annexes ......................................................................................... 43 Annex F (informative)

Test at system reduced capacity .............................................................................. 45 Annex G (informative)

Individual unit tests ................................................................................................... 46 Annex H (normative)

Determination of the liquid pump efficiency ............................................................. 48 Annex I (informative)

Rating of indoor and outdoor units of multisplit and modular heat recovery multisplit system................................................................................................................................. 51 Annex J (normative)

Air flow rate measurement .......................................................................................... 53 Annex ZA (informative)

Relationship between this European Standard and the requirements of Commission regulation (EC) No 206/2012 ....................................................................................... 54 Bibliography ..................................................................................................................................................... 55

SIST EN 14511-3:2013

EN 14511-3:2013 (E) 3 Foreword This document (EN 14511-3:2013) 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 January 2014 and conflicting national standards shall be withdrawn at the latest by January 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14511-3:2011. The main changes with respect to the previous edition are listed below: a) the addition of requirements related to the electrical consumption and the air flow rate measurement of ducted units; b) the addition of a table template containing the test results of the ducted units; c) the addition of two normative annexes related to indoor and outdoor units of multsplit and modular heat recovery multisplit systems and air flow rate measurement; d) the addition of an Annex ZA relating to the Commission Regulation (EC) n°206/2012. 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. Although this document has been prepared in the frame of the commission regulation (EU) No 206/2012 implementing Directive 2009/125/EC with regard to ecodesign requirements for air conditioners and comfort fans, it is also intended to support the essential requirements of the European Directive 2010/30/CE. EN 14511 comprises the following parts under the general title Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling:  Part 1: Terms, definitions and classification,  Part 2: Test conditions,  Part 3: Test methods,  Part 4: Operating requirements, marking and instructions. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14511-3:2013

EN 14511-3:2013 (E) 4 1 Scope 1.1 The scope of EN 14511-1 is applicable. 1.2 This European Standard specifies the test methods for the rating and performance of air conditioners, liquid chilling packages and heat pumps using either air, water or brine as heat transfer media, 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 also makes possible to rate multisplit and modular heat recovery multisplit systems by rating separately the indoor and outdoor units. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14511-1:2013, Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling  Part 1: Terms, definitions and classification EN 14511-2:2013, Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling  Part 2: Test conditions 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 14511-1:2013 apply. 4 Rating capacity test 4.1 Basic principles method of calculation for the determination of capacities 4.1.1 Heating capacity The heating capacity of air conditioners and of air-to-air or water-to-air heat pumps shall be determined by measurements in a calorimeter room (see Annex A) or by the air enthalpy method (see Annex B). However, the heating capacity of air conditioners and of air-to-air heat pumps having a cooling capacity below or equal to 12 kW shall be determined by measurements in a calorimeter room. The heating capacity of air-to-water, water-to-water heat pumps and liquid chilling packages shall be determined in accordance with the direct method at the water or brine heat exchanger, by determination of the volume flow of the heat transfer medium, and the inlet and outlet temperatures, taking into consideration the specific heat capacity and density of the heat transfer medium. For steady state operation, the heating capacity shall be determined using the following formula: HpPqct=×××∆ρ (1) where SIST EN 14511-3:2013

EN 14511-3:2013 (E) 5 PH is the heat capacity, expressed in Watts; q is the volume flow rate, expressed in cubic metres per second; ρ is the density, expressed in kilograms per cubic metre; cp is the specific heat at constant pressure, expressed in joules per kilogram and Kelvin; ∆t is the difference between inlet and outlet temperatures, expressed in Kelvin. NOTE 1 The mass flow rate can be determined directly instead of the term (q x ρ).

NOTE 2 The enthalpy change ∆H can be directly measured instead of the term (cp x ∆t). 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: a) if the fan or pump at the indoor heat exchanger is an integral part of the unit, the same power (calculated in 4.1.5.2 or 4.1.6.3) which is excluded from the total power input shall be also subtracted from the heating capacity; b) if the fan or pump at the indoor heat exchanger is not an integral part of the unit, the same power (calculated in 4.1.5.3 or 4.1.6.4) which is included in the effective power input shall be also added to the heating capacity. 4.1.2 Cooling capacity The cooling capacity of air conditioners and of air-to-air or water-to-air heat pumps shall be determined by measurements in a calorimeter room (see Annex A) or by the air enthalpy method (see Annex B). However, the cooling capacity of air conditioners and of air-to-air heat pumps having a cooling capacity below or equal to 12 kW shall be determined by measurements in a calorimeter room. The cooling capacity of air-to-water, water-to-water heat pumps and liquid chilling packages shall be determined in accordance with the direct method at the water or brine heat exchanger, by determination of the volume flow of the heat transfer medium, and the inlet and outlet temperatures, taking into consideration the specific heat capacity and density of the heat transfer medium. The cooling capacity shall be determined using the following formula: pCPqct=×××ρ∆ (2) where PC is the cooling capacity, expressed in watts; q is the volume flow rate, expressed in cubic metres per second; ρ is the density, expressed in kilograms per cubic metre; cp is the specific heat at constant pressure, expressed in joules per kilogram and Kelvin; ∆t is the difference between inlet and outlet temperatures, expressed in Kelvin. NOTE 1 The mass flow rate can be determined directly instead of the term (q x ρ). NOTE 2 The enthalpy change ∆H can be directly measured instead of the term (cp x ∆t). SIST EN 14511-3:2013

EN 14511-3:2013 (E) 6 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 4.1.5.2 or 4.1.6.3) 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 in 4.1.5.3 or 4.1.6.4) which is included in the effective power input is also subtracted from the cooling capacity. 4.1.3 Heat recovery capacity The heat recovery capacity of air-to-water and water-to-water heat pumps and liquid chilling packages shall be determined in accordance with the direct method at the water or brine heat exchanger, by determination of the volume flow of the heat transfer medium, and the inlet and outlet temperatures, taking into consideration the specific heat capacity and density of the heat transfer medium. The heat recovery capacity shall be determined using the following formula: tcqPpHR∆ρ×××= (3) where PHR is the heat recovery capacity, expressed in Watts; q is the volume flow rate, expressed in cubic metres per second; ρ is the density, expressed in kilograms per cubic metre; cp is the specific heat at constant pressure, expressed in joules per kilogram and Kelvin; ∆t is the difference between inlet and outlet temperatures expressed in Kelvin. NOTE The mass flow rate can be determined directly instead of the term (q x ρ). The enthalpy change ∆H can be directly measured instead of the term (cp x ∆t). The heat recovery capacity shall be corrected for the heat of the pump: a) if the pump at the heat recovery exchanger is an integral part of the unit, the power calculated according to 4.1.6.3 shall be subtracted from heat recovery capacity b) if the pump at the heat recovery exchanger is not an integral part of the unit, the power calculated according to 4.1.6.4 shall be added to the heat recovery capacity. 4.1.4 Power input of fans for units without duct connection In the case of units which are not designed for duct connection, i.e. which do not permit any external pressure differences, and which are equipped with an integral fan, the power absorbed by the fan shall be included in the effective power absorbed by the unit. 4.1.5 Power input of fans for units with duct connection 4.1.5.1 The following corrections of the power input of fans shall be made to both indoor and outdoor fans, where applicable. 4.1.5.2 If a fan is an integral part of the unit, only a fraction of the input of the fan motor shall be included in the effective power absorbed by the unit. The fraction that is to be excluded from the total power absorbed by the unit shall be calculated using the following formula: SIST EN 14511-3:2013

EN 14511-3:2013 (E) 7 η).(minESPpqe−∆ (4) where η is equal to ηtarget ; as declared by the fan manufacturer according to the ecodesign regulation n°327/2011 for fans driven by motors between 125 W and 500 kW. η is 0.3 by convention, for fans driven by motors below 125 W. ∆pe is the measured available external static pressure difference, expressed in Pascal, as defined in 2.52 of EN 14511-1:2013. ESPmin

is the minimum external static pressure difference specified in Table 2 or Table 3, as applicable for an indoor unit, or 30 Pa for an outdoor unit. q is the nominal air flow rate, expressed in cubic meters per second. 4.1.5.3 If no fan is provided with the unit, the proportional power input which is to be included in the effective power absorbed by the unit, shall be calculated using the following formula:

(5)

where η is 0,3 by convention. ∆pi is the measured internal static pressure difference, expressed in Pascal, as defined in 2.53 of EN 14511-1:2013. ESPmin

is the minimum external static pressure difference given in Table 2 or Table 3, as applicable for an indoor unit, or 30 Pa for an outdoor unit. q is the nominal air flow rate, expressed in cubic meters per second. 4.1.6 Power input of liquid pumps 4.1.6.1 The following corrections of the power input of liquid pumps shall be made to both indoor and outdoor (and heat recovery) liquid pumps, where applicable. 4.1.6.2 When the liquid pump is integrated into the unit, it shall be connected for operation. When the liquid pump is delivered by the manufacturer apart from the unit, it shall be connected for operation according to the manufacturer’s instructions and be then considered as an integral part of the unit. 4.1.6.3 If a liquid pump is an integral part of the unit, only a fraction of the input to the pump motor shall be included in the effective power absorbed by the unit. The fraction which is to be excluded from the total power absorbed by the unit shall be calculated using the following formula: ηepq∆× (6) where η is the efficiency of the pump calculated according to Annex H; SIST EN 14511-3:2013

EN 14511-3:2013 (E) 8 ∆pe is the measured available external static pressure difference, expressed in Pascal, as defined in 2.52 of EN 14511-1:2013; q is the nominal liquid flow rate, expressed in cubic meters per second. 4.1.6.4 If no liquid pump is provided with the unit, the proportional power input which is to be included in the effective power absorbed by the unit, shall be calculated using the following formula: η)(ipq∆−× (7) where η is the efficiency of the pump calculated according to Annex H. ∆pi is the measured internal static pressure difference, expressed in Pascal, as defined in 2.53 of EN 14511-1:2013. q is the nominal liquid flow rate, expressed in cubic meters per second. 4.1.6.5 In the case of appliances designed especially to operate on a distributing network of pressurised water without water-pump, no correction is to be applied to the power input. 4.1.7 Units for use with remote condenser The power from the auxiliary liquid pump of the remote condenser shall not be taken into account in the effective power input. 4.2 Test apparatus 4.2.1 Arrangement of the test apparatus 4.2.1.1 General requirements The test apparatus shall be designed in such a way that all requirements on adjustment of set values, stability criteria and uncertainties of measurement according to this European Standard can be fulfilled. 4.2.1.2 Test room for the air side The size of the test room shall be selected such that any resistance to air flow at the air inlet and air outlet orifices of the test object is avoided. The air flow through the room shall not be capable of initiating any short circuit between these two orifices, and therefore the velocity of the air flows through the room at these two locations shall not exceed 1,5 m/s when the test object is switched off. The air velocity in the room shall also not be greater than the mean velocity through the unit inlet. Unless otherwise stated by the manufacturer, the air inlet or air outlet orifices 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 points shall be avoided. 4.2.1.3 Appliances with duct connection The connections of a ducted air unit to the test facility shall be sufficiently air tight to ensure that the measured results are not significantly influenced by exchange of air with the surroundings. SIST EN 14511-3:2013

EN 14511-3:2013 (E) 9 4.2.1.4 Appliances with integral pumps For appliances with integral and adjustable water or brine pumps, the external static pressure shall be set at the same time as the temperature difference. When the liquid pump has one or several fixed speeds, the speed of the pump shall be set in order to provide the minimum external static pressure. In case of variable speed liquid pump, the manufacturer shall provide information to set the pump in order to reach a maximal external static pressure of 10 kPa. 4.2.1.5 Liquid chilling package for use with remote condenser Units for use with remote condenser are tested by using a water-cooled condenser, the characteristics of which shall enable the intended operating conditions to be achieved. 4.2.2 Installation and connection of the test object 4.2.2.1 General The test object shall be installed and connected for the test as recommended by the manufacturer in the installation and operation manual. The accessories provided by option are not included in the test. If a back-up heater is provided in option or not, it shall be switched off or disconnected to be excluded from the testing.

For single ducts, regardless of the manufacturer’s instructions, the discharge duct shall be as short and straight as possible compatibly with minimum distance between the unit and the wall for correct air inlet but not less than 50 cm. No accessory shall be connected to the discharge end of the duct.

For double duct units, the same requirements apply to both suction and discharge ducts, unless the appliance is designed to be installed directly on the wall. For multisplit systems, the test shall be performed with the system operating at a capacity ratio of 1, or as close as possible. When performing measures in heating mode, set the highest room temperature on the unit/system control device; when performing measures in cooling mode, set the lowest room temperature on the unit/system control device. If in the instructions, the manufacturer indicates a value for the temperature set on the control device for a given rating condition, then this value shall be used. For unit with open-type compressor the electric motor shall be supplied or specified by the manufacturer. The compressor shall be operated at the rotational speed specified by the manufacturer. For inverter type control units, the setting of the frequency shall be done for each rating condition. The manufacturer shall provide in the documentation information about how to obtain the necessary data to set the required frequencies. If a skilled personnel with knowledge of control software is required for the start of the system, the manufacturer or the nominated agent should be in attendance when the system is being installed and prepared for tests. 4.2.2.2 Installation of unit consisting of several parts In the case of a unit consisting of several parts, the following installation conditions shall be complied for the test. a) The refrigerant lines shall be installed in accordance with the manufacturer's instructions. The length of the lines shall be 5 m except if the constraints of the test installation make 5 m not possible, in which case a greater length may be used, with a maximum of 7,5 m.

SIST EN 14511-3:2013

EN 14511-3:2013 (E) 10 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 outside conditions, with the rest of the lines exposed to the inside conditions. 4.2.2.3 Indoor units of multisplit systems

When testing a multisplit system in a calorimeter room, the air flow rate and the external static pressure shall be adjusted separately for each one of the ducted indoor units. When testing a multisplit system using the air enthalpy method, the air flow rate and the external static pressure shall be adjusted separately for each indoor unit, ducted or not. In case of equipment with non ducted indoor units tested using the air enthalpy method, the above requirement on ducted indoor units shall apply. 4.2.2.4 Measuring points Temperature and pressure measuring points shall be arranged in order to obtain mean significant values. For free air intake temperature measurements, it is required:  either to have at least one sensor per square meter, with not less than four measuring points and by restricting to 20 the number of sensors equally distributed on the free air surface;  or to use a sampling device. It shall be completed by four sensors for checking uniformity if the surface area is greater than 1 m². Air temperature sensors shall be placed at a maximum distance of 0,25 m from the free air surface. For control cabinet air conditioners, the inlet temperature at the evaporator is measured instead of the temperature inside the control cabinet. For units consisting of a heat pump and a storage tank as a factory made unit, water inlet and outlet temperature measurements shall be taken at the inlet and outlet of this unit. For water and brine, the density in formulae (1), (2) and (3) shall be determined in the temperature conditions measured near the volume flow measuring device. 4.3 Uncertainties of measurement The uncertainties of measurement shall not exceed the values specified in Table 1. SIST EN 14511-3:2013

EN 14511-3:2013 (E) 11 Table 1 — Uncertainties of measurement for indicated values Measured quantity Unit Uncertainty of measurement Liquid

- temperature difference K ± 0,15 K - temperature inlet/outlet K ± 0,15 K - volume flow m3/s ± 1 % - static pressure difference kPa ± 1 kPa (ûp ≤ 20 kPa) or ± 5 %(ûp > 20 kPa) Air

- dry bulb temperature °C ± 0,2 K - wet bulb temperature °C ± 0,4K - volume flow m3/s ± 5 % - static pressure difference

± 5 Pa (∆p ≤ 100 Pa) or ± 5 %(∆p > 100 Pa)
Refrigerant
- pressure at compressor outlet kPa ± 1 % - temperature °C ± 0,5 K Concentration
- Heat transfer medium % ± 2
Electrical quantities

- electric power W ± 1 % - voltage V ± 0,5 % - current A ± 0,5 % - electrical energy kWh ± 1 % Compressor rotational speed

min-1 ± 0,5 %

The heating or cooling capacities measured on the liquid side shall be determined within a maximum uncertainty of 5 % independent of the individual uncertainties of measurement including the uncertainties

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