SIST EN 17625:2026
(Main)Rooftop units - Testing and rating at standard rating conditions and part load conditions for calculation of seasonal performance
Rooftop units - Testing and rating at standard rating conditions and part load conditions for calculation of seasonal performance
document specifies the terms and definitions, the test conditions and the test methods of air-sourced
and water-cooled roof-top units, driven by electric compressor(s), which may be equipped with a
supplementary heater using electrical resistance or combustion of fossil fuel.
This document covers roof-top units with 2, 3 or 4 dampers, including several features as the free-cooling,
mixing air flows (on both sides) and heat recovery.
This document deals with roof-top units providing space heating and/or cooling for comfort application.
Process applications are not covered by this document.
This document provides the part load conditions and the calculation methods taking into account roof-top
units features for the determination of seasonal energy efficiency SEER and SEERon, seasonal space
cooling energy efficiency ηs,c, seasonal coefficient of performance SCOP, SCOPon and SCOPnet,
seasonal space heating energy efficiency ηs,h and the overall annual efficiency.
Such calculation methods may be based on calculated or measured values.
In case of measured values, this document covers the test methods for determination of capacities, EER
and COP values during active mode at part load conditions. It also covers test methods for the
determination of power input during thermostat-off mode, standby mode, off-mode and crankcase heater
mode.
A roof-top unit that is not using at least the thermodynamic cycle for space heating is considered as a
cooling only unit.
Roof-top units equipped with additional air heating and/or cooling heat exchangers will be rated without
operation of these heat exchangers.
Dachgeräte - Prüfung und Bewertung unter Standardbedingungen und Teillastbedingungen zur Berechnung der jahreszeitlichen Leistun
Dieses Dokument legt die Begriffe, die Prüfbedingungen und die Prüfverfahren für die Bewertung und die Leistung von Dachgeräten fest. Es legt zudem die Leistungsbestimmung und die Berechnungsverfahren unter Berücksichtigung der Merkmale von Dachgeräten, wie freie Kühlung und Mischung von Luftströmen, zur Ermittlung der saisonalen Arbeitszahl bei Kühl- und Heizbetrieb fest.
Dieses Dokument behandelt nur Raumheizung und/oder kühlung für Komfortzwecke (Prozessanwendungen liegen nicht im Anwendungsbereich dieses Dokuments). Es ist anwendbar für Luft/Luft- und Wasser/Sole-Luft-Dachgeräte mit elektrisch angetriebenem/n Verdichter(n), die mit einem zusätzlichen Heizgerät ausgestattet sein können und einen elektrischen Widerstand oder die Verbrennung fossiler Brennstoffe verwenden. Dieses Dokument behandelt keine Dachgeräte mit getrennt angeordnetem Verflüssiger.
Dieses Dokument behandelt die Merkmale freie Kühlung, Mischung von Luftströmen (auf beiden Seiten) und interne Wärmerückgewinnung, wie in Anhang A dargestellt. Anhang B enthält zusätzliche Definitionen und Verfahren für die Bestimmung der saisonalen Leistungen für die Kühlung/Heizung von Räumen mindestens mit einem Gemisch aus Außenluft und Umluft.
Unités de toiture - Essais et détermination des performances nominales et à charge partielle pour le calcul de performances saisonnières
Le présent document spécifie les termes et définitions, les conditions d'essai et les méthodes d'essai pour évaluer les performances des unités de toiture. Il spécifie également la détermination des puissances thermiques et les méthodes de calcul tenant compte des caractéristiques des unités de toiture, telles que le refroidissement naturel et les mélanges de flux d'air, pour la détermination des efficacités énergétiques saisonnières en matière de refroidissement et de chauffage.
Le présent document ne couvre que le chauffage et/ou le refroidissement des locaux pour les applications de confort (les applications industrielles ne sont pas couvertes par le présent document). Il s'applique aux unités de toiture air/air et eau (glycolée)/air avec compresseur(s) entraîné(s) par moteur électrique, qui peuvent être équipées d'un dispositif de chauffage d'appoint utilisant la résistance électrique ou la combustion de combustibles fossiles. Le présent document ne couvre pas les unités de toiture avec condenseurs séparés.
Le présent document couvre les caractéristiques du refroidissement naturel, du mélange de flux d'air (des deux côtés) et de la récupération de chaleur interne, comme illustré à l'Annexe A. L'Annexe B fournit des définitions et des méthodes supplémentaires pour déterminer les performances saisonnières pour le refroidissement/chauffage des locaux avec un mélange minimum d'air extérieur et d'air recyclé.
Strešne enote - Preskušanje in ocenitev pri standardnih nazivnih pogojih in pogojih delne obremenitve za izračun letnega učinka
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Strešne enote - Preskušanje in ocenitev pri standardnih nazivnih pogojih in
pogojih delne obremenitve za izračun letnega učinka
Rooftop units - Testing and rating at standard rating conditions and part load conditions
for calculation of seasonal performance
Dachgeräte - Prüfung und Bewertung unter Standardbedingungen und
Teillastbedingungen zur Berechnung der jahreszeitlichen Leistun
Unités de toiture - Essais et détermination des performances nominales et à charge
partielle pour le calcul de performances saisonnières
Ta slovenski standard je istoveten z: EN 17625:2025
ICS:
91.140.30 Prezračevalni in klimatski Ventilation and air-
sistemi conditioning systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17625
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2025
EUROPÄISCHE NORM
ICS 91.140.30
English Version
Rooftop units - Testing and rating at standard rating
conditions and part load conditions for calculation of
seasonal performance
Unités de toiture - Essais et détermination des Dachgeräte - Prüfung und Bewertung unter
performances nominales et des performances à charge Standardbedingungen und Teillastbedingungen zur
partielle pour le calcul de performances saisonnières Berechnung der jahreszeitlichen Leistun
This European Standard was approved by CEN on 5 October 2025.
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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17625:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols, abbreviated terms and units . 7
3.1 Terms and definitions . 7
3.2 Symbols, abbreviated terms and units . 21
4 Test conditions . 24
4.1 Standard rating conditions . 24
4.2 Part load conditions . 24
4.2.1 General. 24
4.2.2 Units running with no free cooling capabilities, running only at 100 % recycled air 25
4.2.3 Units running with free cooling capabilities . 25
4.2.4 Cooling mode . 26
4.2.5 Heating mode . 28
5 Test apparatus . 30
5.1 General requirements . 30
5.2 Test room . 30
5.3 Appliances with duct connection . 30
5.4 Installation and connection of the test object . 30
5.4.1 General. 30
5.4.2 Measuring points . 30
5.5 Uncertainties of measurement . 31
6 Settings . 33
6.1 Settings of supply air . 33
6.2 Setting on the outdoor heat exchanger side . 35
6.2.1 Non ducted units . 35
6.2.2 Ducted units . 35
6.2.3 Water-source units . 36
6.2.4 Units with integrated liquid pumps . 36
7 Capacity and power input calculations . 37
7.1 Basic principles for the determination of capacities . 37
7.2 Effective power input correction . 37
7.2.1 General. 37
7.2.2 Power input correction of fans for units without duct connection. 37
7.2.3 Power input correction of fans for units with duct connection . 37
7.2.4 Power input correction of liquid pumps . 38
8 Capacity test method . 39
8.1 Output measurement for water source units . 39
8.1.1 Steady-state condition . 39
8.1.2 Measurement of heating capacity and cooling capacity . 39
8.2 Output measurement for cooling capacity of air source units . 39
8.2.1 Steady-state condition . 39
8.2.2 Measurement of cooling capacity. 39
8.3 Output measurement for heating capacity of air source units . 39
8.3.1 General. 39
8.3.2 Step 1: Preconditioning . 41
8.3.3 Step 2: End of defrost cycle. 42
8.3.4 Step 3: Equilibrium period . 42
8.3.5 Step 5: Data collection . 42
8.3.6 Step 4: Defrost cycle . 43
8.3.7 Step 6: Steady-state operation . 43
8.3.8 Step 7: Transient operation . 43
8.4 Permissible deviations . 44
8.5 Test results. 46
8.5.1 Data to be recorded . 46
8.5.2 Cooling capacity calculation . 48
8.5.3 Heating capacity calculation . 49
8.5.4 Effective power input calculation . 49
9 Test methods for electric power input during thermostat-off mode, standby mode and
crankcase heater mode and off mode . 50
9.1 Uncertainties of measurement . 50
9.2 Measurement of electric power input during thermostat-off mode . 50
9.3 Measurement of the electric power input during standby mode . 50
9.4 Measurement of the electric power input during crankcase heater mode . 51
9.5 Measurement of the electric power input during off mode . 51
10 Seasonal performances . 51
10.1 Calculation of SEER, SEER , SEER and SEER . 51
F on on,F
10.1.1 General formula for calculation of SEER . 51
10.1.2 Calculation of the reference annual cooling demand Q . 51
C
10.1.3 Calculation of the reference annual energy consumption for cooling Q . 52
CE
10.1.4 Calculation of SEER . 52
on
10.1.5 Calculation of SEER . 53
F
10.1.6 Calculation of the reference annual energy consumption for cooling Q . 53
CE,F
10.1.7 Calculation of SEER . 53
on,F
10.1.8 Calculation procedure for determination of EER values at part load conditions . 54
bin
10.2 Calculation of SCOP, SCOP and SCOP . 56
on net
10.2.1 General formula for calculation of SCOP . 56
10.2.2 Calculation of the reference annual heating demand Q . 56
H
10.2.3 Calculation of the annual energy consumption for heating Q . 57
HE
10.2.4 Calculation of SCOP and SCOP . 57
on net
10.2.5 Calculation procedure for determination of COP values at part load conditions . 59
bin
10.3 Calculation of seasonal efficiencies . 60
10.3.1 Calculation of the seasonal space cooling efficiency ηs,c . 60
10.3.2 Calculation of the seasonal space cooling efficiency with free-cooling mode η . 61
s,cF
10.3.3 Calculation of the seasonal space heating efficiency η . 61
s,h
10.4 Determination of
...
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