Radiators and convectors - Part 2: Test methods and rating

This part of EN 442 defines procedures for determining the standard thermal outputs and other characteristics of metallic radiators and convectors installed in a permanent manner in construction works, fed with water or steam at temperatures below 120 °C, supplied by a remote heat source
This European Standard specifies the laboratory arrangements and testing methods to be adopted, the admissible tolerances, the criteria for selecting the samples to be tested and for verifying the conformity of the current production with the samples tested at the initial test.
This European Standard also defines the additional common data that the manufacturer shall provide to the trade in order to ensure the correct application of the products.
This European Standard does not apply to fan assisted radiators, fan assisted convectors and trench convectors and to independent heating appliances.

Heizkörper und Konvektoren - Teil 2: Prüfverfahren und Leistungsangabe

Diese Europäische Norm legt die Verfahren zur Bestimmung der Norm-Wärmeleistungen und anderer Merkmale von metallischen Heizkörpern und Konvektoren für den dauerhaften Einbau in Bauwerken zum Betrieb mit Wasser oder Dampf unter 120 °C aus einer externen Wärmequelle fest.
Diese Europäische Norm legt die von den Prüflaboren zu treffenden Vorkehrungen und die anzuwendenden Prüfverfahren, die zulässigen Abweichungen, die Kriterien für die Auswahl der Probekörper und den Nachweis der Übereinstimmung der Werte aus der laufenden Fertigung mit den Ergebnissen des Probekörpers aus der Erstprüfung fest.
Diese Europäische Norm legt auch die zusätzlichen einheitlichen Angaben fest, die der Hersteller dem Markt zur Verfügung stellen muss, um die richtige Verwendung der Produkte sicherzustellen.
Diese Norm gilt nicht für gebläseunterstützte Heizkörper, gebläseunterstützte Konvektoren und Unterflur-konvektoren und selbstständige Heizkörper.

Radiateurs et convecteurs - Partie 2 : Méthodes d'essai et d'évaluation

La présente Norme européenne définit les procédures de détermination des puissances thermiques nominales et autres caractéristiques des radiateurs et convecteurs destinés à être installés de façon durable dans les ouvrages de construction, alimentés avec de l'eau ou de la vapeur à des températures inférieures à 120 °C, fournie par une source d'énergie extérieure.
La présente Norme européenne spécifie les dispositifs de laboratoire et les méthodes d'essai à adopter, les tolérances admissibles, ainsi que les critères pour la sélection des échantillons à soumettre à essai et pour la vérification de la conformité de la production courante avec les échantillons initialement soumis à essai.
La présente Norme européenne définit également les données additionnelles usuelles que le fabricant doit fournir avec son produit afin d'assurer une utilisation correcte des produits.
La présente Norme européenne ne s'applique pas aux radiateurs et convecteurs avec ventilateurs, aux convecteurs encastrés dans le sol et aux dispositifs de chauffage indépendants.

Končni prenosniki toplote in konvektorji - 2. del: Preskusne metode in vrednotenje

Ta del standarda EN 442 določa postopke za ugotavljanje standardnega toplotnega oddajanja in drugih lastnosti kovinskih radiatorjev in konvektorjev, trajno nameščenih v zgradbe, ki se iz oddaljenega vira toplote polnijo z vodo ali paro pri temperaturi pod 120 ° C.
Ta evropski standard določa ureditev laboratorijev in zahtevane preskusne metode, dopustne tolerance, merila za izbor preskusnih vzorcev in za preverjanje skladnosti trenutne proizvodnje z vzorci, presušenimi ob prvem preskusu.
Ta evropski standard opredeljuje tudi dodatne skupne podatke, ki jih mora proizvajalec zagotoviti za pravilno uporabo izdelkov.
Ta evropski standard ne velja za radiatorje z ventilatorji, konvektorje z radiatorji in talne konvektorje ter samostojne ogrevalne naprave.

General Information

Status
Published
Public Enquiry End Date
30-Jul-2013
Publication Date
16-Feb-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Jan-2015
Due Date
30-Mar-2015
Completion Date
17-Feb-2015

Relations

Buy Standard

Standard
SIST EN 442-2:2015
English language
78 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 442-2:2015
01-marec-2015
1DGRPHãþD
SIST EN 442-2:1997
SIST EN 442-2:1997/A1:2002
SIST EN 442-2:1997/A2:2004

.RQþQLSUHQRVQLNLWRSORWHLQNRQYHNWRUMLGHO3UHVNXVQHPHWRGHLQYUHGQRWHQMH

Radiators and convectors - Part 2: Test methods and rating
Heizkörper und Konvektoren - Teil 2: Prüfverfahren und Leistungsangabe
Radiateurs et convecteurs - Partie 2 : Méthodes d'essai et d'évaluation
Ta slovenski standard je istoveten z: EN 442-2:2014
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 442-2:2015 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 442-2:2015
---------------------- Page: 2 ----------------------
SIST EN 442-2:2015
EUROPEAN STANDARD
EN 442-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2014
ICS 91.140.10 Supersedes EN 442-2:1996
English Version
Radiators and convectors - Part 2: Test methods and rating

Radiateurs et convecteurs - Partie 2 : Méthodes d'essai et Radiatoren und Konvektoren - Teil 2: Prüfverfahren und

d'évaluation Leistungsangabe
This European Standard was approved by CEN on 11 October 2014.

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
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 442-2:2014 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
Contents Page

Foreword ..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................6

2 Normative references ............................................................................................................................6

3 Terms, definitions, symbols and units ................................................................................................6

3.1 Terms and definitions ...........................................................................................................................6

3.2 Symbols and units of measurement ................................................................................................. 11

4 Selection of heating appliances to be tested ................................................................................... 12

4.1 Classification ....................................................................................................................................... 12

4.2 Selection of models to be tested for determining the thermal outputs of a type ........................ 12

4.2.1 Selection of models to be tested when the variable characteristic dimension is the overall

height and the cross-section of the variable part is constant ....................................................... 12

4.2.2 Selection of models to be tested when the variable characteristic dimension for the type

is other than the overall height ......................................................................................................... 13

4.3 Testing samples submission and identification .............................................................................. 14

4.4 Supplementary test............................................................................................................................. 17

5 Equipment of laboratory and test methods ..................................................................................... 17

5.1 Principle ............................................................................................................................................... 17

5.2 Apparatus ............................................................................................................................................ 17

5.2.1 Test system ......................................................................................................................................... 17

5.2.2 Reference test installation ................................................................................................................. 17

5.2.3 Master radiators .................................................................................................................................. 20

5.2.4 Verification of test installation repeatability and reproducibility .................................................. 24

5.2.5 Accuracy of measuring instruments and devices ........................................................................... 29

5.2.6 Calibration of measuring instruments .............................................................................................. 30

5.3 Preparation for thermal output test .................................................................................................. 30

5.4 Test methods ....................................................................................................................................... 30

5.4.1 General ................................................................................................................................................. 30

5.4.2 Weighing method ................................................................................................................................ 31

5.4.3 Electric method ................................................................................................................................... 31

5.4.4 Measurements and calculations ....................................................................................................... 31

5.4.5 Determination of the characteristic equation .................................................................................. 34

5.5 Presentation of results ....................................................................................................................... 35

5.5.1 Standard thermal output of a model ................................................................................................. 35

5.5.2 Determination of the catalogue outputs of a type made at variable water flow rate ................... 36

6 Test report ........................................................................................................................................... 36

Annex A (normative) Master radiators dimensional verification ................................................................ 39

Annex B (informative) Determination of pressure drop ............................................................................... 46

B.1 Introduction ......................................................................................................................................... 46

B.2 Pressure drop equation of a type...................................................................................................... 47

B.2.1 General ................................................................................................................................................. 47

B.2.2 Pressure drop characteristic equation of a model .......................................................................... 47

B.3 Test method ......................................................................................................................................... 47

B.3.1 Test circuit ........................................................................................................................................... 47

B.3.2 Pressure tappings............................................................................................................................... 47

B.4 Test procedure — Setting up ............................................................................................................. 48

B.5 Measurements of differential pressures using an inverted U tube manometer ........................... 48

B.5.1 Techniques of measurement ............................................................................................................. 48

---------------------- Page: 4 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)

B.5.2 Surface tension effect ......................................................................................................................... 48

B.5.3 Leakage ................................................................................................................................................ 48

B.5.4 Air pockets in connecting piping ....................................................................................................... 48

B.5.5 Blocked pressure holes ...................................................................................................................... 48

B.5.6 Level of inlet and outlet connections ................................................................................................ 49

B.5.7 Damping (throttling) of excessive movement (oscillation) of inverted U tube manometer

liquid ..................................................................................................................................................... 49

Annex C (normative) Least squares regression for a model ....................................................................... 53

Annex D (normative) Analysis of test results by the method of least squares multiple regression ....... 54

Annex E (normative) Specimen of the test report ......................................................................................... 56

Annex F (informative) Apparatus and method for checking the bulk temperature measuring

devices ................................................................................................................................................. 60

Annex G (informative) Examples of typical appliances according to Table 4 ............................................ 62

Annex H (normative) Determination of the Φ values of the master radiators primary set ...................... 71

Annex I (normative) Traceability of the thermal output measurement of radiators and convectors ....... 72

I.1 General ................................................................................................................................................. 72

I.2 Thermal output traceability ................................................................................................................ 72

I.2.1 Reference test installations ................................................................................................................ 72

I.2.2 Approved test installations ................................................................................................................ 73

I.3 Handling of the Master radiator sets ................................................................................................. 73

Annex J (normative) Calibration Procedure................................................................................................... 74

J.1 General ................................................................................................................................................. 74

J.2 RRT Organizational course ................................................................................................................ 74

J.3 Test procedure and submission of results ....................................................................................... 75

J.4 Test analysis and assessment ........................................................................................................... 75

Annex K (normative) Pretreatment and paint testing method ..................................................................... 77

Bibliography ...................................................................................................................................................... 78

---------------------- Page: 5 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
Foreword

This document (EN 442-2:2014) has been prepared by Technical Committee CEN/TC 130 “Space heating

appliances without integral heat sources”, the secretariat of which is held by UNI.

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 June 2015, and conflicting national standards shall be withdrawn at

the latest by June 2015.

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 442-2:1996.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

The most significant changes that have been made in this new edition of EN 442-2 are the following ones:

— some new definitions have been added;
— the straight or curved towel or bathroom radiator have been included;
— different surface treatments have been included;
— a new normative Annex J "Calibration Procedure" has been added;

— a new normative Annex K "Pretreatment and paint testing method" has been added.

This European Standard comes from an output of the project SMT4 - CT97 - 2127 funded by the European

Commission DGXII-RDT.

This European Standard, Radiators and convectors, consists of the following parts:

— Part 1: Technical specifications and requirements;
— Part 2: Test methods and rating [the present document].

According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.

---------------------- Page: 6 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
Introduction

This European Standard results from the recognition that the heating appliances falling into the field of

application hereinafter stated are traded on the basis of their thermal output.

To evaluate and compare different appliances it is therefore necessary to refer to a single stipulated value,

hereinafter called the standard rated thermal output.

In addition, for low temperature systems a standard low temperature thermal output is given.

The standard thermal outputs (standard rated thermal output and standard low temperature thermal output)

are defined value taken from the characteristic equation.

The pre-requisites of the standard thermal outputs, as defined by this European Standard, are the following:

— to be representative of the actual output of the appliance in different operating conditions;

— to be reproducible within the tolerances defined by this European Standard, taking into account the state

of measuring techniques;

— to be representative of the thermal outputs, obtainable under the same test conditions, of any identical

sample taken out of the current production (within the tolerances defined by this European Standard

taking into account the state of measuring techniques and methods of manufacture).

---------------------- Page: 7 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
1 Scope

This European Standard defines procedures for determining the standard thermal outputs and other

characteristics of radiators and convectors installed in a permanent manner in construction works, fed with

water or steam at temperatures below 120 °C, supplied by a remote energy source.

This European Standard specifies the laboratory arrangements and testing methods to be adopted, the

admissible tolerances, the criteria for selecting the samples to be tested and for verifying the conformity of the

current production with the samples tested at the initial test.

This European Standard also defines the additional common data that the manufacturer shall provide with the

product in order to ensure the correct application of the products.

This European Standard does not apply to fan assisted radiators, fan assisted convectors and trench

convectors and to independent heating appliances.
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 10088-1, Stainless steels — Part 1: List of stainless steels

EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories

(ISO/IEC 17025)

ISO 16269-7, Statistical interpretation of data — Part 7: Median — Estimation and confidence intervals

3 Terms, definitions, symbols and units
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
heating appliance

device having the purpose of transferring heat in order to provide specific temperature conditions inside

buildings
3.1.2
independent heating appliance

self-contained heating appliance which does not need to be connected to a remote energy source (e.g. a

boiler) as it contains its own energy source (e.g. gas fired appliances, electric appliances, air to air heat pump

appliances)
3.1.3
radiator

heating appliance produced with different materials (e.g. steel, aluminium, cast-iron) and with different designs

(e.g. plate type, column type, tube type, finned tube type), which emits heat by free convection and radiation

3.1.4
sectional heating appliances (mainly applied to radiators)

heating appliance manufactured in sections of identical design and traded in this form which can be joined

together into modular assemblies so that the desired output can be obtained
---------------------- Page: 8 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
3.1.5
free convection heating appliance

heating appliance which does not contain a fan or similar device to activate the air flow over heat emitter

3.1.6
convector
heating appliance which emits heat almost entirely by free convection

Note 1 to entry: A convector comprising at least a heat emitter and a casing which provides an unheated convective

chimney of defined height.
3.1.7
skirting convector
convector of limited height running along the base of an interior wall
3.1.8
height of the unheated convective chimney

vertical distance between the lowest edge of the convector and the bottom of the air outlet section

Note 1 to entry: It applies to convectors only, being a main factor influencing their thermal output.

3.1.9
wet heating surface; primary heating surface

portion of the heat emitting surface which is always in contact with the primary fluid (water or steam)

3.1.10
dry heating surface; secondary heating surface

portion of the heat emitting surface which is in contact with air only (e.g. fins projecting from the wet surface)

3.1.11
family of heating appliances

group of heating appliances of similar design and construction and of identical material, positions of primary

fluid connections and other related variables that particularly affect the conditions of flow of the primary fluid

within the heating appliance
3.1.12
type of radiators/convectors

group of heating appliances of similar design whose cross-section remains unchanged while the height or

length varies or which have a systematic variation of only one characteristic dimension of the dry heating

surfaces providing that this does not affect the water side (e.g. the height of convector fins on panel radiator)

Note 1 to entry: For the calculation in conformity to Annex D, at least three models are required.

3.1.13
model
heating appliance of defined height, length and depth within a type
3.1.14
range of heights
difference between the maximum and minimum height of the models in a type
3.1.15
module of heating appliances
reference length of the useful portion of a heating appliance
Note 1 to entry: The module coincides with:
— the section, in the case of sectional heating appliances;
— a length of 1 m, in the case of non-sectional heating appliances;
---------------------- Page: 9 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
— a finned length of 1 m, in the case of finned tube convectors.
3.1.16
sample

representative heating appliance used for the determination of one or more of the performance characteristics

3.1.17
inlet water temperature
bulk temperature of the water entering the heating appliance
3.1.18
outlet water temperature
bulk temperature of the water leaving the heating appliance
3.1.19
temperature drop
difference between inlet and outlet water temperature
3.1.20
mean water temperature
arithmetical mean of inlet and outlet water temperature
3.1.21
reference air temperature

air temperature measured on the vertical line at the centre of the test booth, 0,75 m above the floor level

3.1.22
excess temperature
difference between mean water temperature and reference air temperature
3.1.23
standard excess temperature
excess temperature of 50 K as determined in the standard conditions

Note 1 to entry: Inlet water temperature of 75 °C, outlet water temperature of 65 °C and reference air temperature of

20 °C.
3.1.24
standard excess low temperature
excess temperature of 30 K at standard flow rate
3.1.25
air pressure
air pressure measured at the test place
3.1.26
standard air pressure
101,325 kPa (1,013 25 bar)
3.1.27
water flow rate
amount of water flowing through the heating appliance per unit of time
3.1.28
standard water flow rate
water flow rate relating to standard test conditions
---------------------- Page: 10 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
3.1.29
standard rated thermal output
thermal output of a heating appliance defined at 50 K excess temperature
3.1.30
standard low temperature thermal output
thermal output of a heating appliance defined at 30 K excess temperature
3.1.31
characteristic equation

power function with a specific characteristic exponent that gives the thermal output as a function of the excess

temperature at constant water flow rate
3.1.32
standard characteristic equation

characteristic equation which is valid for standard water flow rate and from which the standard thermal output

can be found for the standard excess temperature of 50 K
3.1.33
regression equation of a type

equation which gives the standard thermal outputs and the characteristic exponent of all the models within a

type as a function of one characteristic dimension

Note 1 to entry: The regression equation for the determination of thermal outputs is a power function, in which the

characteristic exponent is a linear function of the characteristic dimension.
3.1.34
standard thermal output of the module

standard thermal output of a model divided either by the number of sections or by the length in metres

3.1.35
test pressure

relative pressure to which the heating appliance is submitted during the manufacturing process (i.e. factory

test pressure)
3.1.36
maximum operating pressure
MOP

maximum relative pressure of the system to which the heating appliance may be submitted as chosen by

manufacturer
Note 1 to entry: The maximum operating pressure is expressed in [kPa].
3.1.37
maximum operating temperature
maximum inlet water temperature allowed by the manufacturer
3.1.38
test installation
combination of:
— test booth and other related parts, and
— measuring instruments and related equipment
3.1.39
test system
combination of:
---------------------- Page: 11 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
— test installation, and
— master radiators
3.1.40
test systems circuit

group of test systems convened to comply with the specifications and procedures of this European Standard

and to a periodical comparison of test results
3.1.41
repeatability of a test installation

capability of one test installation to provide test results on one given set of master radiator within the tolerance

specified by this European Standard
Note 1 to entry: See 5.2.4.
3.1.42
reproducibility of a test installation

capability of different test installations to provide test results on one given set of master radiators within the

tolerance specified by this European Standard
Note 1 to entry: See 5.2.4.
3.1.43
pressure drop

difference of pressure between water inlet and water outlet of the heating appliance

3.1.44
standard pressure drop

drop in pressure between inlet and outlet of the appliance heat emitter on the primary fluid side, when the

appliance is fed at the standard water flow rate
3.1.45
supplementary test

test for the purpose of establishing the effect of minor technical modifications on the thermal output of

radiators that have already been tested
3.1.46
radiated heat output factor

assumed ratio between the radiation heat output and the overall heat output of the radiator, which is only valid

for air pressure correction purposes
3.1.47
exponent np

exponent for the air pressure correction of the measured heat output of the radiator

3.1.48
emissivity

ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature

3.1.49
master radiator
sample used for the calibration of test installations

Note 1 to entry: Master radiators are used to determine repeatability and reproducibility of the results of the test

installations (see 5.2.3).
---------------------- Page: 12 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
3.2 Symbols and units of measurement
Table 1 — Symbols, quantity and units of measurement
Quantity Symbol Unit
Thermal output W
Standard thermal output W
Modular thermal output W
Reference value of a master radiator W
Reference value of a primary set of master radiators for interlaboratory
Φ W
comparisons
Electrical method heat losses Φ W
Electric power P
Thermodynamic temperature T
Temperature t
Inlet water temperature t
Outlet water temperature t
Temperature drop t -t
1 2
Mean water temperature
t °C
Reference room air temperature
t °C
Excess temperature
ΔT K
Specific heat capacity
c J/kg∙K
Specific enthalpy
h J/kg
Inlet water enthalpy
h J/kg
Outlet water enthalpy
h J/kg
Water flow rate
q kg/s
Standard water flow rate
q kg/s
Pressure p kPa
Maximum operating pressure/resistance to pressure p kPa
max
Pressure drop Δp kPa
Repeatability tolerance S -
Reproducibility tolerance S -
Overall height of the heating appliance H m
Range of heights H m
Overall length of the heating appliance L m
Length of a section L m
Number of sections N -
Thermal resistance R m ∙K/W
Time interval τ s
Radiated heat output factor Sk -
Emissivity ε -
---------------------- Page: 13 ----------------------
SIST EN 442-2:2015
EN 442-2:2014 (E)
4 Selection of heating appliances to be tested
4.1 Classification

4.1.1 Heating appliances shall be grouped into families and types according to the definition in this

European Standard. A family can include different types.

4.1.2 For the purposes of determining catalogue outputs, a family shall be divided into a number of

separate types (in a family of radiators there may, for example, be single or double panels, with or without

convector surfaces, using the same basic components).

4.1.3 The output of each model shall not be greater than 3 500 W and the minimum thermal output of the

selected model shall be not less than 200 W at standard excess temperature.

On request of the manufacturer lower thermal output could be tested and the deviation from the previous

requirements shall be registered in the test report.
4.2 Selection of models to be tested for determining the thermal outputs
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.