prEN 17625

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

Unités de toiture - Essais et détermination des performances nominales et à charge partielle pour le calcul de performances saisonnières

Strešne enote - Preskušanje in ocenitev pri standardnih nazivnih pogojih in pogojih delne obremenitve za izračun letnega učinka

General Information

• Status: Not Published
• Publication Date: 23-Apr-2025
• ICS: 91.140.30 - Ventilation and air-conditioning systems
• Technical Committee: CEN/TC 113 - Heat pumps and air conditioning units
• Drafting Committee: CEN/TC 113/WG 15 - Roof-top units
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 22-Aug-2024
• Due Date: 07-Dec-2023
• Completion Date: 22-Aug-2024
• Directive: 2016/2281 - Commission Regulation (EU) 2016/2281 of 30 November 2016 implementing Directive 2009/125/EC of the European Parliament and of the Council establishing a framework for the setting of ecodesign requirements for energy-related products, with regard to ecodesign requirements for air heating products, cooling products, high temperature process chillers and fan coil units
• Ref Project: oSIST prEN 17625:2024 - Rooftop units - Testing and rating at standard rating conditions and part load conditions for calculation of seasonal performance

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2024
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: prEN 17625
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2024
ICS
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 à charge partielle pour le Standardbedingungen und Teillastbedingungen zur
calcul de performances saisonnières Berechnung der jahreszeitlichen Leistun
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 113.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17625:2024 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 . 8
3.1 Terms and definitions . 8
3.2 Symbols, abbreviated terms and units . 21
4 Test conditions . 23
4.1 Standard rating conditions . 23
4.2 Part load conditions . 23
4.2.1 General. 23
4.2.2 Units running with no free cooling capabilities, running only at 100 % recycled air 24
4.2.3 Units running with free cooling capabilities . 24
4.2.4 Cooling mode . 24
4.2.5 Heating mode . 25
5 Test apparatus . 27
5.1 General requirements . 27
5.2 Test room . 27
5.3 Appliances with duct connection . 27
5.4 Installation and connection of the test object . 28
5.4.1 General. 28
5.4.2 Measuring points . 28
5.5 Uncertainties of measurement . 29
6 Settings . 30
6.1 Settings of supply air . 30
6.2 Setting on the outdoor heat exchanger side . 32
6.2.1 Non ducted units . 32
6.2.2 Ducted units . 32
6.2.3 Water-source units . 33
6.2.4 Units with integrated liquid pumps . 33
7 Capacity and power input calculations . 34
7.1 Basic principles for the determination of capacities . 34
7.2 Effective power input correction . 34
7.2.1 General. 34
7.2.2 Power input correction of fans for units without duct connection. 34
7.2.3 Power input correction of fans for units with duct connection . 34
7.2.4 Power input correction of liquid pumps . 35
8 Capacity test method . 35
8.1 Output measurement for water source units . 35
8.1.1 Steady-state condition . 35
8.1.2 Measurement of heating capacity and cooling capacity . 36
8.2 Output measurement for cooling capacity of air source units . 36
8.2.1 Steady-state condition . 36
8.2.2 Measurement of cooling capacity. 36
8.3 Output measurement for heating capacity of air source units . 36
8.3.1 General . 36
8.3.2 Step 1: Preconditioning . 38
8.3.3 Step 2: End of defrost cycle. 39
8.3.4 Step 3: Equilibrium period . 39
8.3.5 Step 5: Data collection . 39
8.3.6 Step 4: Defrost cycle . 40
8.3.7 Step 6: Steady-state operation . 40
8.3.8 Step 7: Transient operation . 40
8.4 Permissible deviations . 41
8.5 Test results. 43
8.5.1 Data to be recorded . 43
8.5.2 Cooling capacity calculation . 45
8.5.3 Heating capacity calculation . 46
8.5.4 Effective power input calculation . 46
9 Test methods for electric power input during thermostat-off mode, standby mode and
crankcase heater mode and off mode . 46
9.1 Uncertainties of measurement . 46
9.2 Measurement of electric power input during thermostat-off mode . 47
9.3 Measurement of the electric power input during standby mode . 47
9.4 Measurement of the electric power input during crankcase heater mode . 47
9.5 Measurement of the electric power input during off mode . 48
10 Seasonal performances . 48
10.1 Calculation of SEER, SEER , SEER and SEER . 48
F on on,F
10.1.1 General formula for calculation of SEER . 48
10.1.2 Calculation of the reference annual cooling demand Q . 48
C
10.1.3 Calculation of the reference annual energy consumption for cooling Q . 48
CE
10.1.4 Calculation of SEER . 49
on
10.1.5 Calculation of SEER . 49
F
10.1.6 Calculation of the reference annual energy consumption for cooling Q . 50
CE,F
10.1.7 Calculation of SEER . 50
on,F
10.1.8 Calculation procedure for determination of EER values at part load conditions . 51
bin
10.2 Calculation of SCOP, SCOP and SCOP . 53
on net
10.2.1 General formula for calculation of SCOP . 53
10.2.2 Calculation of the reference annual heating demand Q . 53
H
10.2.3 Calculation of the annual energy consumption for heating Q . 53
HE
10.2.4 Calculation of SCOP and SCOP . 54
on net
10.2.5 Calculation procedure for determination of COP values at part load conditions . 56
bin
10.3 Determination of the degradation coefficients C and C . 57
dc dh
10.3.1 General .
...