Heating boilers - Test code for heating boilers for atomizing oil burners

The test code applies to the determination of the perfomances of  heating boilers combi boilers and water heaters fired by liquid fuels. The requirements are laid down in EN 303-1 and EN 303-2.
This code includesthe requirements and recommendations for carrying out and evaluating the procedure for testing boilers and also the details of the technical conditions under which the tests shall be carried out.

Heizkessel - Prüfregeln für Heizkessel mit Ölzerstäubungsbrennern

Die Prüfregeln gelten für die Ermittlung der Leistung von mit flüssigen Brennstoffen befeuerten Heizkesseln und Kombikesseln. Die Anforderungen an die Heizleistungen sind in prEN 303 1:2016 und prEN 303 2:2016 festgelegt.
Die Regeln enthalten die Anforderungen und Empfehlungen für die Durchführung und Auswertung der Versuche zur Prüfung von Kesseln sowie Angaben über die technischen Bedingungen, unter denen die Prüfungen stattfinden sollen.
Die Anforderungen und die Durchführung von Prüfungen für die sanitäre Warmwasserbereitung von Kombikesseln sind in EN 303 6 festgelegt.

Chaudières de chauffage - Règles d'essai pour les chaudières pour brûleurs à fioul à pulvérisation

La présente Norme européenne s'applique à la détermination des performances des chaudières de chauffage et des chaudières à deux services fonctionnant avec des brûleurs à air soufflé. Les exigences relatives aux performances de chauffage sont établies dans le prEN 303 1:2016 et le prEN 303 2:2016.
Ces règles incluent les exigences et les recommandations relatives à la réalisation et à l'évaluation de la procédure d'essai des chaudières ainsi qu'aux détails des conditions techniques dans lesquelles seront réalisés les essais.
Les exigences et la réalisation des essais relatifs à la production d'eau chaude sanitaire par des chaudières à deux services sont établies dans le prEN 303 6.

Kotli za gretje - Preskušanje kotlov z razprševalnimi oljnimi gorilniki

Preskusna koda se uporablja za določanje zmogljivosti kotlov za gretje, kombiniranih kotlov in grelnikov vode na tekoča goriva. Zahteve so določene v standardih EN 303-1 in EN 303-2. Ta koda zajema zahteve in priporočila za izvajanje ter ocenjevanje postopka preskušanja kotlov in podrobnosti o tehničnih pogojih, pri katerih je treba izvajati preskuse.

General Information

Status
Published
Public Enquiry End Date
31-Jul-2016
Publication Date
07-Dec-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Nov-2017
Due Date
12-Jan-2018
Completion Date
08-Dec-2017

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SLOVENSKI STANDARD
SIST EN 304:2018
01-januar-2018
1DGRPHãþD
SIST EN 15034:2007
SIST EN 15034:2007/AC:2008
SIST EN 304:1997
SIST EN 304:1997/A1:1999
SIST EN 304:1997/A2:2004
Kotli za gretje - Preskušanje kotlov z razprševalnimi oljnimi gorilniki
Heating boilers - Test code for heating boilers for atomizing oil burners
Heizkessel - Prüfregeln für Heizkessel mit Ölzerstäubungsbrennern

Chaudières de chauffage - Règles d'essai pour les chaudières pour brûleurs à fioul à

pulvérisation
Ta slovenski standard je istoveten z: EN 304:2017
ICS:
27.060.10 *RULOQLNLQDWHNRþHLQWUGR Liquid and solid fuel burners
JRULYR
97.100.40 *UHOQLNLQDWHNRþHJRULYR Liquid fuel heaters
SIST EN 304:2018 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 304:2018
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SIST EN 304:2018
EN 304
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2017
EUROPÄISCHE NORM
ICS 91.140.10 Supersedes EN 15034:2006, EN 304:1992
English Version
Heating boilers - Test code for heating boilers for
atomizing oil burners

Chaudières de chauffage - Règles d'essai pour les Heizkessel - Prüfregeln für Heizkessel mit

chaudières pour brûleurs à fioul à pulvérisation Ölzerstäubungsbrennern
This European Standard was approved by CEN on 2 July 2017.

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, Serbia, 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

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 304:2017 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 304:2018
EN 304:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 General conditions for testing .................................................................................................................... 5

5 Measurement accuracies and uncertainties ......................................................................................... 6

6 Measurements for the heating mode ....................................................................................................... 7

6.1 General ................................................................................................................................................................ 7

6.2 Determination of the nominal heat output ............................................................................................ 7

6.3 Determination of the boiler efficiency at nominal heat output...................................................... 7

6.4 Performance of testing .................................................................................................................................. 8

6.4.1 General test conditions ................................................................................................................................. 8

6.4.2 Draught adjustment ....................................................................................................................................... 8

6.4.3 Establishment of steady-state conditions .............................................................................................. 8

6.4.4 Test period ......................................................................................................................................................... 8

6.5 Calculation ......................................................................................................................................................... 8

6.5.1 General ................................................................................................................................................................ 8

6.5.2 Nominal heat output ...................................................................................................................................... 8

6.5.3 Boiler heat input .............................................................................................................................................. 8

6.5.4 Boiler efficiency ............................................................................................................................................... 9

6.6 Determination of the waterside resistance ........................................................................................... 9

6.7 Determination of the standby heat loss ............................................................................................... 10

6.7.1 General ............................................................................................................................................................. 10

6.7.2 Standby heat loss method 1 ...................................................................................................................... 11

6.7.3 Standby heat loss method 2 ...................................................................................................................... 12

6.8 Efficiency at 30 % of the nominal heat output ................................................................................... 14

6.8.1 General ............................................................................................................................................................. 14

6.8.2 Efficiency at 30 % - Method 1 (time dependent method) .............................................................. 14

6.8.3 Efficiency at 30 % - Method 2 (load dependent method) .............................................................. 14

6.9 Auxiliary electricity consumption ......................................................................................................... 15

6.10 Seasonal space heating efficiency .......................................................................................................... 16

6.11 Verification of nominal condensing output ........................................................................................ 16

6.12 Formation of condensation ...................................................................................................................... 16

6.13 Functional test for the temperature sensing control type TR and temperature

sensing control type STB on the boiler ................................................................................................. 16

6.14 Surface temperature ................................................................................................................................... 20

6.15 Floor temperatures ..................................................................................................................................... 20

6.16 Limiting temperature of the test panels .............................................................................................. 20

6.17 Emission values of NO and CO ................................................................................................................ 21

6.17.1 General ............................................................................................................................................................. 21

6.17.2 Units .................................................................................................................................................................. 21

6.17.3 Assemblies of a boiler with various burners ..................................................................................... 21

7 Measurement of the sanitary water production mode ................................................................... 21

8 Test report and other documents .......................................................................................................... 22

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SIST EN 304:2018
EN 304:2017 (E)

Annex A (normative) Calculations for the heating mode ............................................................................ 23

A.1 Volume measurement ................................................................................................................................. 23

A.2 Calculation of combustion parameters ................................................................................................. 23

A.3 Determination of air factor (𝜆𝜆) and excess air (e) ............................................................................ 27

A.4 Test rigs ............................................................................................................................................................ 28

A.5 Calculation of the nominal heat output P ........................................................................................... 29

A.6 Calculation of the heat input ..................................................................................................................... 30

A.7 Calculation of efficiency ............................................................................................................................. 30

A.8 Calculation of the heat losses q , q , q .................................................................................................. 32

A U S

A.9 Standby heat loss (P ).............................................................................................................................. 35

Stby

A.10 Calculation of the seasonal space heating energy efficiency ........................................................ 37

A.11 Fuel characteristics ...................................................................................................................................... 38

Annex B (informative) Applicable symbols and units .................................................................................. 40

Annex C (informative) Criteria for the adaptation of forced draught burners using liquid

fuels to heating boilers ............................................................................................................................... 43

Annex D (informative) Information for setting up and evaluation of the test rig .............................. 45

Annex E (informative) Determination of the heat losses of the test rig ................................................. 46

Annex ZA (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Regulation (EU) No [813/2013] aimed to be covered .......... 47

Annex ZB (informative) Relationship between this European Standard and the ecodesign

requirements of Commission Delegated Regulation (EU) No [811/2013] aimed to be

covered ............................................................................................................................................................. 48

Bibliography ................................................................................................................................................................. 49

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SIST EN 304:2018
EN 304:2017 (E)
European foreword

This document (EN 304:2017) has been prepared by Technical Committee CEN/TC 57 “Central heating

boilers”, the secretariat of which is held by DIN.

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 May 2018, and conflicting national standards shall be

withdrawn at the latest by May 2018.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 304:1992 and EN 15034:2006.

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 Annexes ZA and ZB, which are an integral part of

this document.

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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 304:2018
EN 304:2017 (E)
1 Scope

This European Standard applies to the determination of the performances of heating boilers and combi

boilers fired by liquid fuels. The requirements for the heating performances are laid down in

EN 303-1:2017 and EN 303-2:2017.

This test code includes the requirements and recommendations for carrying out and evaluating the

procedure for testing boilers and also the details of the technical conditions under which the tests will

be carried out.

The requirements and the performance of testing for the sanitary hot water production of combi boilers

are laid down in prEN 303-6.
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 267:2009+A1:2011, Automatic forced draught burners for liquid fuels

EN 303-1:2017, Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology,

general requirements, testing and marking

EN 303-2:2017, Heating boilers - Part 2: Heating boilers with forced draught burners - Special

requirements for boilers with atomizing oil burners

prEN 303-6, Heating boilers - Part 6: Heating boilers with forced draught burners - Specific requirements

for the domestic hot water operation and energy performance of water heaters and combination boilers

with atomizing oil burners of nominal heat input not exceeding 70 kW

EN 15456, Heating boilers - Electrical power consumption for heat generators - System boundaries -

Measurements

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

(ISO/IEC 17025)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 303-1:2017 and

EN 303-2:2017 and the following apply.
3.1
minimum continuous heat output
minC

lowest heat output which is maintained automatically by the control device in continuous operation

which is specified for each type of fuel in accordance with the requirements of this European Standard

4 General conditions for testing

The performance tests of the boiler shall be carried out by a test laboratory complying with the

requirements of EN ISO/IEC 17025.

The test sample shall correspond to a boiler as placed on the market including all parts and accessories

necessary for the operation of the boiler. Boilers to be equipped with different burners shall be tested

with one specified forced draught burner.
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SIST EN 304:2018
EN 304:2017 (E)

The boiler and the burner shall be operated in accordance with the operation manual throughout all

tests.

When determining the thermal outputs P and 30 % P of a combi boiler, no sanitary hot water shall be

N N

drawn off during the test. The thermal outputs shall be determined from the heating circuit only.

Sanitary hot water tests for combination boiler shall be done according to prEN 303-6.

5 Measurement accuracies and uncertainties

The accuracy of the measurement devices for the following parameters shall not exceed:

a) Atmospheric pressure 50 Pa;
b) Waterside pressure loss 2 % of measured value;
c) Water flow rate 1 % of measured value;
d) Air volume flow rate 2 % of measured value;
e) Time
1) up to 1 h: 0,2 s;
2) beyond 1 h: 0,1 % of measured value
f) Auxiliary electrical energy 2 % of measured value;
g) Temperatures:
1) Ambient 2 K;
2) Water 1 K;
3) Combustion products 2 K;
4) Surface 2 K;
h) CO, CO , O , NO , C H :
2 2 x x y
1) CO -content: 0,1 % volume from full scale
2) O -content: 0,1 % volume from full scale
3) CO-content: 5 ml/m
4) NO -content: 5 ml/m
5) C H -content: 5 ml/m
x y
i) Mass 0,05 % of the full scale;
j) Pressure flue gas:
1) ≤ 60 Pa: 1Pa;
2) > 60 Pa: 2 % of the measured value.
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SIST EN 304:2018
EN 304:2017 (E)

The full range of the measuring apparatus shall be chosen in such a way that it is suitable for maximum

anticipated value. The measurement accuracies indicated above concern individual measurements.

For measurements requiring a combination of individual measurements, the lower accuracies

associated with individual measurements may be necessary to attain the total required uncertainty. The

test rig shall be set up in such a way that the efficiency can be determined within a uncertainty of 2 %

points.
6 Measurements for the heating mode
6.1 General

The amount of useful heat output transmitted to the heat carrier (water) is measured. It can be

determined in the boiler circuit or by means of a secondary heat exchanger.

The useful heat output transmitted to the water is determined either by measuring

a) the mass flow of cold water entering the boiler circuit and the rise of temperature between the

outlet water temperature and the inlet water temperature; or

b) the mass flow of the water circulating in the boiler circuit and its temperature rise; or

c) the mass flow and the temperature rise over a secondary heat exchanger corrected by the heat loss

of this secondary heat exchanger. The heat produced by the boiler is transferred to the cooling

water by means of a secondary heat exchanger. The heat received by the latter is calculated from

the mass flow and the temperature rise of the cooling water. The heat losses from the well-

insulated connections between the boiler and the secondary heat exchanger and those of the

secondary heat exchanger itself, are determined either by preliminary tests or by calculation. The

heat output of the boiler is the sum of the two amounts of heat.
6.2 Determination of the nominal heat output

The tests for the determination of the nominal heat output shall be carried out at a firing rate such that

the output is at least 100 %, but does not exceed 105 % of the nominal value, and the requirements

concerning the nominal heat output shall be met.

If the heat output exceeds 105 %, a second test shall be carried out at a firing rate between 95 % and

100 % of the nominal heat output of the boiler.

The actual value for the nominal heat output shall be determined by linear interpolation between the

two test results.

The nominal heat output shall be determined at a water rate that is adjusted to obtain a return water

temperature of (60 ± 1) °C and a temperature difference between the flow and return water

temperature of (20 ± 2) °C.

NOTE The conditions for determination of the rated heat output in former versions of EN 304 have been a

mean flow temperature of between 80 °C and 90 °C, and the mean temperature difference between flow and

return has been between 10 K and 25 K. However, this is not in line with the Regulation EU 813/2013.

6.3 Determination of the boiler efficiency at nominal heat output

The boiler efficiency at nominal heat output is measured as the determination of the nominal heat

output (see 6.2).
The efficiency shall be determined on the basis of the net calorific value NCV.

The direct method according to 6.5.4.1 shall be applied. The indirect method allows an additional check

of test accuracy of the test rig to be made by means of an energy balance.
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SIST EN 304:2018
EN 304:2017 (E)
6.4 Performance of testing
6.4.1 General test conditions

The boiler is installed in accordance with the technical instructions in a well-ventilated, draught free

room (air speed less than 0,5 m/s), which has an ambient temperature of (20 ± 5) K. The boiler is

protected from direct solar radiation.

The settings of the burner shall not be manually changed after adjustment. No change shall be made to

the water flow or any other test parameter during one test period.

The temperature, pressure and composition of the products of combustion shall be measured

continuously and shall be recorded with a sampling rate below 10 s.

The flow temperature t and the return temperature t shall not differ by more than

F R
0,5 K/h × test period [h] at the beginning and the end of the test period.
6.4.2 Draught adjustment
6.4.2.1 Boilers operating under negative pressure

For boilers operating under negative pressure the draught at the boiler outlet shall be adjusted so that

there is a negative pressure in the combustion chamber. The draught shall be measured.

6.4.2.2 Boilers operating under positive pressure

In positive pressure boilers the pressure shall be set at the boiler outlet close to 0 Pa. The pressure

difference between combustion chamber and boiler outlet shall be measured.
6.4.3 Establishment of steady-state conditions

The boiler shall be operated for at least 1 h before the start of the performance and efficiency test at the

output intended for the test without any further interference.

The steady-state condition is reached once the water temperatures t and t do not vary by more

F R
than ± 0,5 K/h.
6.4.4 Test period

The test period shall be at least 60 min. Intermediate results shall be taken every 30 min. If the

efficiency results of 2 consecutive 30 min test sequences deviate by more than 0,5 % points, the test

shall be extended by periods of 30 min until this requirement is met.
6.5 Calculation
6.5.1 General

The calculations shall be based on the mean values of the individual readings of all recorded parameters

during the test period of 2 consecutive 30 min test sequences which meet the requirements of 6.4.4.

6.5.2 Nominal heat output
The necessary formulae relevant to the individual test methods are given in A.5.
6.5.3 Boiler heat input
For these calculations, formulae in A.6 are to be used.
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SIST EN 304:2018
EN 304:2017 (E)
6.5.4 Boiler efficiency
6.5.4.1 Direct method
In the direct method the boiler efficiency shall be determined by:
(1)
η ×100
P and Q as described in Annex A.
NOTE P equals either PN or 30 % PN.
6.5.4.2 Indirect method

The indirect method is used for checking purposes only. The indirect boiler efficiency is given by:

η=1−−qq−q (2)
k A US
where

q is the loss assensible heat of the products of combustion (values relative to the heat input)

q is the loss as incomplete combustion (values relative to the heat input)

q is the loss as radiation, convection and conduction (values relative to the heat input)

These heat losses are calculated in A.7
6.6 Determination of the waterside resistance

The hydraulic resistance of a boiler (measured in mbar) shall be determined for the water rate

corresponding to operation of the boiler at the nominal heat input with a water flow temperature of

80 °C and a temperature difference between the flow and the return water of 20 K.

Other conditions are accepted if documented.
The test is carried out with the water at ambient temperature.

The test rig is specified in Figure 1. Before or after the test, the two test pipes are connected directly to

each other in order to determine their own resistance for the specified flow rate.

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SIST EN 304:2018
EN 304:2017 (E)
Key
1 vent
2 differential manometer
3 flexible tubes
4 boiler
5 test pipe
section at “X” rotated through 90°
6 flexible pipe
7 orifice ⌀ 3 mm smoothed internally
Figure 1 — Determination of the hydraulic resistance
6.7 Determination of the standby heat loss
6.7.1 General
For the determination of standby heat loss one of the two methods shall be used.
No useful heat shall be extracted for heating or sanitary hot water production.
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SIST EN 304:2018
EN 304:2017 (E)
6.7.2 Standby heat loss method 1
6.7.2.1 Test arrangement and measurement

The boiler shall remain as set up for the determination of P and η . The flow water connection and the

N K
return water connection shall be connected by a short circuit connection.

If the boiler is equipped with a control for the pump, it shall be kept in operation as delivered.

If the boiler is not equipped with a control for the pump, the short circuit of the test rig may be

equipped with a pump which is used to avoid thermal stratification in the boiler. It starts via the water

temperature controller together with the burner and shall stop 3 min after the burner is switched off.

The tests are normally carried out with burners without air dampers. If an air damper is used this shall

be stated in the test report.

After heating up the boiler, the test begins at a burner start. The test ends at a subsequent burner start

(a period commences at a burner start and ends at the next burner start).

The result of the measurement includes the boiler losses and the short circuit losses. The losses of the

short-circuit section are deducted from the result of the test.

At the end of each test period the fuel consumption shall be measured. The standby heat loss shall be

calculated at the end of each test period — from the beginning of the test.

The test can be finished, if two successive results differ by no more than 5 %. The smallest of the two

results shall be used to calculate q — related to the desired value of the temperature.

nn+−1
< 0,05
(3)
where

q standby heat loss (in %, see Formula (A.36) of period 1 to n+1; corresponds to Σ(qP)

n+1 i
from 1 to n+1;

q standby heat loss (in %, see Formula (A.36)) of period 1 to n; corresponds to Σ(qP) from

n i
1 to n;
(qP) standby heat loss of period i.
The Formula (3) can be written as follows:
nn+1
qP − qP
( ) ( )
ii11i i
(4)
<0,05
( )
i=1

The fuel consumption, the boiler mean water temperature and the air temperature at mid height of the

boiler shall be measured.

A negative pressure of between 5 Pa and 7 Pa shall be maintained at the measuring section when the

burner is not firing during the whole test period.
6.7.2.2 Calculation
The calculation shall be in accordance with A.8.
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SIST EN 304:2018
EN 304:2017 (E)
6.7.2.3 Standby heat loss from combi boilers

For boilers producing sanitary hot water, the hot and cold water feed pipes remain connected, the hot

water storage tank shall be charged with a temperature of (40 ) K above the ambient temperature.

During the test it is to be noted that the hot water heating period can be longer than that of the boiler

(see Figure 7). In this case the period for the heating of the hot water is to be used for the determination

of the standby heat loss and is calculated in accordance with 6.7.2.2

The same procedure is applicable to other combinations of equipment with overlapping periods.

6.7.3 Standby heat loss method 2
The test installation is described in Figures 3, 4 and 5.

The circuits joining the different parts of the installation shall be insulated and as short as possible. The

inherent losses of the test installation and the thermal contribution of the pump for the different flow

rates shall be determined at the beginning to be able to take account of them (see Annex B).

The boiler is fitted with the largest diameter test flue stated by the manuf
...

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