Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products

This European Standard specifies the requirements and test methods for the safety and efficiency of non-domestic gas-fired air heaters not exceeding a net heat input of 300 kW with (an) atmospheric burner(s) and without a fan to assist the transportation of combustion air and/or flue gases, hereafter referred to as "appliances".
This European Standard applies to Type B11, B41, C11 and C31 appliances intended for use in other than single unit residential dwellings. Provision of the heated air may be by means of ducting or may be directly into the heated space.
This standard does not apply to:
a)    appliances intended for use in a single unit residential dwelling;
b)    appliances of the condensing type;
c)    appliances for outdoor installation;
d)    dual purpose air conditioning appliances (heating and cooling);
e)    appliances where the air is heated by an intermediate fluid;
f)    appliances with forced draught burners;
g)    appliances fitted with a manual or automatic means of adjusting the combustion air supply or the combustion products evacuation (including flue dampers);
h)    portable or transportable forced convection appliances;
i)    appliances having multiple heating units with a single draught diverter;
j)    appliances fitted with more than one flue outlet;
k)   appliances that are designed for continuous condensation within the flue system under normal operating conditions;
l)   appliances having combustion products evacuation ducts, POCEDs, that are non-metallic.
This standard is applicable to appliances which are intended to be type tested.  It also includes requirements concerning the evaluation of conformity, including factory production control, but these requirements only apply to POCEDs and their associated terminals.
NOTE   Requirements for appliances which are not type tested would need to be subject to further consideration.

Gasbefeuerte Warmlufterzeuger mit erzwungener Konvektion zum Beheizen von Räumen für den nicht-häuslichen Gebrauch mit einer Nennwärmebelastung nicht über 300 kW, ohne Gebläse zur Beförderung der Verbrennungsluft und/oder der Abgase

Diese Europäische Norm spezifiziert die Anforderungen und Prüfverfahren für die Sicherheit und Wirksamkeit gasbefeuerter Warmlufterzeuger für den nicht-häuslichen Gebrauch mit einem oder mehreren Gasbrennern ohne Gebläse mit einer Nennwärmebelastung bis 300 kW und ohne Gebläse zur Beförderung der Verbrennungsluft und/oder des Abgases, im Folgenden als Geräte bezeichnet.
Diese Europäische Norm gilt für Geräte der Typen B11, B41, C11 und C31, deren Gebrauch in aus nur einer Einheit bestehenden Wohnungen ausgeschlossen ist. Die Zufuhr der Heizluft kann entweder mittels Leitungen oder direkt in den zu beheizenden Raum erfolgen.
Diese Norm gilt nicht für:
a)   Geräte, die für den Gebrauch in aus nur einer Einheit bestehenden Wohnungen ausgelegt sind;
b)   Geräte mit Brennwertnutzung;
c)   Geräte zur Aufstellung im Freien;
d)   Doppelzweck-Klimaanlagen (zum Heizen und Kühlen);
e)   Geräte, bei denen die Luft mittels einer Zwischenflüssigkeit erwärmt wird;
f)   Geräte mit Gasbrennern mit Gebläse;
g)   Geräte mit einer handbetätigten oder automatischen Einrichtung zur Einstellung der Verbrennungsluft-zufuhr oder der Abgasabführung (einschließlich Abgasdrosselklappen);
h)   tragbare oder transportable Geräte mit erzwungener Konvektion;
i)   Geräte mit mehreren Heizelementen mit nur einer Strömungssicherung;
j)   Geräte mit mehr als einem Abgasstutzen;
k)   Geräte, die innerhalb der Abgasleitungen bei den üblichen Betriebsbedingungen für andauernde Kondensation ausgelegt sind;
l)   Geräte mit Abgasleitungen aus nichtmetallenen Werkstoffen POCEDs.
Diese Norm ist anwendbar für Geräte, die für eine Typprüfung vorgesehen sind. Sie enthält auch Anforde-rungen an die Entwicklung von Übereinstimmung einschließlich Fertigungskontrolle, aber diese Anforde¬rungen gelten nur für Bauprodukte POCEDs und deren dazugehörende Windschutzeinrichtungen.
ANMERKUNG   Anforderungen an Geräte, die nicht für eine Typprüfung vorgesehen sind, benötigen weitere Über-legungen.

Générateurs d'air chaud à convection forcée utilisant les combustibles gazeux pour le chauffage de locaux autres que l'habitat individuel, de débit calorifique sur Hi inférieur ou égal à 300 kW, sans ventilateur pour aider l'alimentation en air comburant et/ou l'évacuation des produits de combustion

La présente Norme européenne définit les exigences et les méthodes d’essais relatives à la sécurité et au rendement des générateurs d’air chaud à usage non domestique fonctionnant au gaz et de débit calorifique net inférieur ou égal à 300 kW sur pouvoir calorifique inférieur, comportant un ou des brûleur(s) atmosphérique(s) et sans ventilateur pour aider l’alimentation en air comburant et/ou l’évacuation des produits de combustion, appelés ci-après « appareils ».
La présente Norme européenne s’applique aux appareils de types B11, B41, C11 et C31 destinés à être utilisés dans des locaux autres que l’habitat individuel. La distribution de l'air chaud peut se faire par des gaines ou directement dans l'espace à chauffer.
La présente Norme européenne ne s'applique pas :
a)   aux appareils destinés à être utilisés dans un appartement résidentiel autonome ;
b)   aux appareils à condensation ;
c)   aux appareils destinés à une installation extérieure ;
d)   aux appareils de climatisation à usage double (chauffage et refroidissement de l’air) ;
e)   aux appareils de chauffage de l’air par un fluide caloporteur intermédiaire ;
f)   aux appareils à brûleurs avec ventilateur ;
g)   aux appareils comportant des moyens de réglage manuels ou automatiques de l’alimentation en air comburant ou de l'évacuation des produits de combustion (y compris les clapets de cheminées) ;
h)   aux appareils à convection forcée portatifs ou transportables ;
i)   aux appareils comportant plusieurs générateurs de chaleur associés à un seul coupe-tirage antirefouleur ;
j)   aux appareils comportant plusieurs buses d'évacuation ;
k)   aux appareils conçus pour une condensation continue dans le système d'évacuation dans des conditions de fonctionnement normales ;
l)   aux appareils comportant des conduits d’évacuation des produits de combustion (POCED) non métalliques.
La présente norme s’applique aux appareils devant être soumis à des essais de types.

Plinski grelniki zraka s prisilno konvekcijo za gretje nestanovanjskih prostorov z imensko močjo do vključno 300 kW brez ventilatorja za zgorevalni zrak in/ali produkte zgorevanja

Ta evropski standard določa zahteve in preskusne metode za varnost in učinkovitost plinskih negospodinjskih grelnikov zraka, ki ne presegajo dovoda toplote 300 kW z atmosferskimi gorilniki in brez ventilatorja za zgorevalni zrak in/ali dimne pline, v nadaljevanju »aparatov«. Ta evropski standard velja za tipe aparatov B11, B41, C11 in C31, ki niso namenjeni za uporabo v posameznih enotah stanovanjskih objektov. Preskrbovanje s segretim zrakom lahko poteka preko vodov ali neposredno v prostor, ki se segreva. Ta standard ne velja za: a) aparate, namenjene za uporabo v posamezni enoti stanovanjskega objekta; b) aparate kondezacijskega tipa; c) aparate za zunanjo namestitev; d) aparate za klimatizacijo, ki imajo dvojni namen (segrevanje in hlajenje); e) aparate, kjer se zrak segreva z vmesno tekočino; f) aparate, ki imajo gorilnike na prisilni vlek; g) aparate, opremljene z ročnim ali avtomatskim sredstvom uravnavanja zalog zgorevalnega zraka ali praznjenje produktov izgorevanja (vključno z blažilniki dimnega plina); h) prenosne ali premične aparate s prisilno konvekcijo; i) aparate, ki imajo več grelnikov z enim preusmerjevalcem vleka; j) aparate, opremljene z več kot enim izhodom dimnega plina; k) aparate, ki so zasnovani za neprekinjeno kondenzacijo znotraj sistema za dimni plin pod običajnimi pogoji delovanja; l) aparate, ki imajo vode za praznjenje produktov izgorevanja, POCEDs, ki niso iz kovine. Ta standard velja za aparate, namenjene za tipsko preskušanje. Prav tako vsebuje zahteve glede ocenjevanja skladnosti, vključno s kontrolo proizvodnje, ki pa veljajo zgolj za POCEDs in z njimi povezane terminale.

General Information

Status
Withdrawn
Publication Date
10-Nov-2009
Withdrawal Date
15-Oct-2019
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
16-Oct-2019

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SLOVENSKI STANDARD
SIST EN 621:2010
01-februar-2010
1DGRPHãþD
SIST EN 621:1999
SIST EN 621:1999/A1:2002

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LPHQVNRPRþMRGRYNOMXþQRN:EUH]YHQWLODWRUMD]D]JRUHYDOQL]UDNLQDOL
SURGXNWH]JRUHYDQMD

Non-domestic gas-fired forced convection air heaters for space heating not exceeding a

net heat input of 300 kW, without a fan to assist transportation of combustion air and/or

combustion products
Gasbefeuerte Warmlufterzeuger mit erzwungener Konvektion zum Beheizen von

Räumen für den nicht-häuslichen Gebrauch mit einer Nennwärme¬belastung nicht über

300 kW, ohne Gebläse zur Beförderung der Verbrennungsluft und/oder der Abgase

Générateurs d'air chaud a convection forcée utilisant les combustibles gazeux pour le

chauffage de locaux autres que l'habitat individuel, de débit calorifique sur Hi inférieur ou

égal a 300 kW, sans ventilateur pour aider l'alimentation en air comburant et/ou
l'évacuation des produits de combustion
Ta slovenski standard je istoveten z: EN 621:2009
ICS:
97.100.20 Plinski grelniki Gas heaters
SIST EN 621:2010 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 621:2010
---------------------- Page: 2 ----------------------
SIST EN 621:2010
EUROPEAN STANDARD
EN 621
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2009
ICS 97.100.20 Supersedes EN 621:1998
English Version
Non-domestic gas-fired forced convection air heaters for space
heating not exceeding a net heat input of 300 kW, without a fan
to assist transportation of combustion air and/or combustion
products

Générateurs d'air chaud à convection forcée utilisant les Gasbefeuerte Warmlufterzeuger mit erzwungener

combustibles gazeux pour le chauffage de locaux autres Konvektion zum Beheizen von Räumen für den nicht-

que l'habitat individuel, de débit calorifique sur Hi inférieur häuslichen Gebrauch mit einer Nennwärmebelastung nicht

ou égal à 300 kW, sans ventilateur pour aider l'alimentation über 300 kW, ohne Gebläse zur Beförderung der

en air comburant et/ou l'évacuation des produits de Verbrennungsluft und/oder der Abgase

combustion
This European Standard was approved by CEN on 10 October 2009.

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 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 Management Centre has the same status as the

official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 621:2009: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 621:2010
EN 621:2009 (E)
Contents Page

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

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

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

3 Terms and definitions........................................................................................................................... 7

3.1 Appliance and its constituent parts .................................................................................................... 7

3.2 Adjustment, control and safety devices ............................................................................................. 9

3.3 Operation of the appliance ................................................................................................................ 11

3.4 Gases ................................................................................................................................................... 14

3.5 Conditions of operation and measurement ..................................................................................... 15

3.6 Marking of the appliance and packaging ......................................................................................... 16

4 Classification ....................................................................................................................................... 16

4.1 Classification of gases ....................................................................................................................... 16

4.2 Classification of appliances according to the gases capable of being used ............................... 17

4.3 Classification of appliances according to the mode of evacuation of the combustion

products ............................................................................................................................................... 18

5 Construction and design requirements............................................................................................ 19

5.1 General ................................................................................................................................................. 19

5.2 Adjusting, control and safety devices .............................................................................................. 25

5.3 Ignition devices ................................................................................................................................... 28

5.4 Flame supervision system ................................................................................................................. 29

5.5 Start-gas flame establishment ........................................................................................................... 30

5.6 Main flame establishment .................................................................................................................. 31

5.7 Main burner ......................................................................................................................................... 32

5.8 Facility for remote control ................................................................................................................. 32

5.9 Thermostats and control of air temperature .................................................................................... 32

5.10 Combustion chamber pressure reliefs ............................................................................................. 33

5.11 Facilities for commissioning and testing ........................................................................................ 33

6 Operational requirements .................................................................................................................. 34

6.1 Safety of operation ............................................................................................................................. 34

6.2 Efficiency ............................................................................................................................................. 38

7 Test methods ....................................................................................................................................... 39

7.1 General ................................................................................................................................................. 39

7.2 Construction and design ................................................................................................................... 46

7.3 Safety of operation ............................................................................................................................. 47

7.4 Efficiency ............................................................................................................................................. 69

8 Marking and instructions ................................................................................................................... 75

8.1 Marking of the appliance .................................................................................................................... 75

8.2 Marking of the packaging .................................................................................................................. 76

8.3 Utilization of symbols on the appliance and packaging ................................................................. 76

8.4 Instructions ......................................................................................................................................... 78

9 Evaluation of POCED conformity and their associated terminals ................................................. 80

9.1 General ................................................................................................................................................. 80

9.2 Type testing ......................................................................................................................................... 80

9.3 Factory production control (FPC) ..................................................................................................... 81

Annex A (informative) National situations .................................................................................................... 83

A.1 General ................................................................................................................................................. 83

A.2 Categories listed in the body of the standard and marketed in different countries .................... 83

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SIST EN 621:2010
EN 621:2009 (E)

A.3 Appliance supply pressures corresponding to the categories given in A.2 ................................. 85

A.4 Special categories marketed nationally or locally ........................................................................... 86

A.5 Test gases corresponding to the special categories given in A.4 ................................................. 90

A.6 Gas connections in the various countries ........................................................................................ 91

A.7 Flue connections in the various countries ....................................................................................... 93

Annex B (informative) Equivalence rules ...................................................................................................... 94

B.1 Conversion to categories within a restricted Wobbe index range ................................................. 94

B.2 Conversion to categories within an identical Wobbe index range ................................................. 94

B.3 Conversion to categories within a wider Wobbe index range ........................................................ 95

Annex C (informative) Facilities for commissioning and testing ................................................................ 96

C.1 Appliances with automatic ignition of a start-gas flame ................................................................. 96

C.2 Appliances with direct automatic ignition of the main burner ....................................................... 96

Annex D (informative) Identification of gas types in use in various countries ......................................... 97

Annex E (informative) A-deviations ................................................................................................................ 98

E.1 General ................................................................................................................................................. 98

E.2 Switzerland ........................................................................................................................................... 98

Annex F (normative) Special national conditions ........................................................................................ 99

F.1 General ................................................................................................................................................. 99

F.2 Belgium ................................................................................................................................................. 99

F.3 Italy ........................................................................................................................................................ 99

Annex G (informative) National solutions for countries whose national bodies are Affiliate

Members of CEN ............................................................................................................................... 100

G.1 Categories listed in the body of the standard and marketed in different countries ................... 100

G.2 Appliance supply pressures corresponding to the categories given in G.1 ............................... 100

G.3 Special categories marketed nationally or locally ......................................................................... 100

G.4 Gases and test pressures corresponding to the special categories given in G.3 ...................... 100

Annex H (informative) Calculation of conversions of NOx ........................................................................ 101

Annex I (informative) An example of a sampling plan ................................................................................. 102

I.1 Sampling plans .................................................................................................................................. 102

I.2 Inspection levels and procedures.................................................................................................... 103

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

Requirements of EU Directive 90/396/EEC ..................................................................................... 104

Annex ZB (informative) Clauses of this European Standard addressing the provisions of the EU

Construction Products Directive ..................................................................................................... 106

ZB.1 Scope and relevant characteristics ................................................................................................. 106

ZB.2 Procedure(s) for attestation of conformity of [construction products] ....................................... 108

ZB.3 CE marking and labelling .................................................................................................................. 110

Bibliography .................................................................................................................................................... 112

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SIST EN 621:2010
EN 621:2009 (E)
Foreword

This document (EN 621:2009) has been prepared by Technical Committee CEN/TC 180 “Domestic and non-

domestic gas fired air heaters and non-domestic overhead radiant heaters”, the secretariat of which is held by

AFNOR.

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 2010, and conflicting national standards shall be withdrawn at the

latest by May 2010.

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 621:1998.

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 integral parts of this

document.

This revision modifies EN 621:1998. It has been prepared to incorporate requirements for combustion

products evacuation ducts, POCEDs, supplied as an integral part of the system to support the EU Directive

89/106/EEC on construction products under mandate M105. To this end it extends the scope of the standard

to cover Type B appliances.

Furthermore, the opportunity presented by this revision has been taken to update the standard in respect to

EN 437:2003.

NOTE For countries requesting special categories (specified in EN 437:2003), the absence of specific information

concerning A.4.3 and A.4.4 implies that the general requirements described in the body of the standard (see 5.1.1, 5.2.2,

5.2.3 and 5.2.5) also apply to these special categories.

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, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 621:2010
EN 621:2009 (E)
1 Scope

This European Standard specifies the requirements and test methods for the safety and efficiency of non-

domestic gas-fired air heaters not exceeding a net heat input of 300 kW with (an) atmospheric burner(s) and

without a fan to assist the transportation of combustion air and/or flue gases, hereafter referred to as

"appliances".

This European Standard applies to Type B , B , C and C appliances intended for use in other than single

11 41 11 31

unit residential dwellings. Provision of the heated air may be by means of ducting or may be directly into the

heated space.
This standard does not apply to:
a) appliances intended for use in a single unit residential dwelling;
b) appliances of the condensing type;
c) appliances for outdoor installation;
d) dual purpose air conditioning appliances (heating and cooling);
e) appliances where the air is heated by an intermediate fluid;
f) appliances with forced draught burners;

g) appliances fitted with a manual or automatic means of adjusting the combustion air supply or the

combustion products evacuation (including flue dampers);
h) portable or transportable forced convection appliances;
i) appliances having multiple heating units with a single draught diverter;
j) appliances fitted with more than one flue outlet;

k) appliances that are designed for continuous condensation within the flue system under normal

operating conditions;

l) appliances having combustion products evacuation ducts, POCEDs, that are non-metallic.

This standard is applicable to appliances which are intended to be type tested. It also includes requirements

concerning the evaluation of conformity, including factory production control, but these requirements only

apply to POCEDs and their associated terminals.

NOTE Requirements for appliances which are not type tested would need to be subject to further consideration.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

EN 88-1, Pressure regulators and associated safety devices for gas appliances – Part 1: Pressure regulators

for inlet pressures up to and including 500 mbar

EN 125, Flame supervision devices for gas burning appliances – Thermoelectric flame supervision devices

---------------------- Page: 7 ----------------------
SIST EN 621:2010
EN 621:2009 (E)
EN 126, Multifuctional controls for gas burning appliances
EN 161:2007, Automatic shut-off valves for gas burners and gas appliances
EN 257, Mechanical thermostats for gas-burning appliances

EN 298:2003, Automatic gas burner control systems for gas burners and gas burning appliances with or

without fans
EN 437:2003, Test gases – Test pressures – Appliance categories
EN 1859:2000, Chimneys – Metal chimneys – Test methods

EN 10226-1, Pipe threads where pressure tight joints are made on the threads – Part 1: Taper external

threads and parallel internal threads – Dimensions, tolerances and designation

EN 10226-2, Pipe threads where pressure tight joints are made on the threads – Part 2: Taper external

threads and taper internal threads – Dimensions, tolerances and designation

EN 60335-1, Household and similar electrical appliances – Safety – Part 1: General requirements (IEC 60335-

1:2001, modified)

EN 60335-2-102, Household and similar electrical appliances – Safety – Part 2-102: Particular requirements

for gas, oil and solid-fuel burning appliances having electrical connections (IEC 60335-2-102:2004, modified)

EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)

EN 60584-1, Thermocouples – Part 1: Reference tables (IEC 60584-1:1995)
EN 60584-2:1993, Thermocouples – Part 2: Tolerances (IEC 60584-2:1982 + A1:1989)

EN 60730-1, Automatic electrical controls for household and similar use – Part 1: General requirements (IEC

60730- 1:1999, modified)

EN 60730-2-9:2002, Automatic electrical controls for household and similar use – Part 2-9: Particular

requirements for temperature sensing controls (IEC 60730-2-9:2000, modified)

EN 61058-1, Switches for appliances – Part 1: General requirements (IEC 61058-1:2000 + A1:2001, modified)

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads – Part 1: Dimensions,

tolerances and designation (ISO 228-1:2000)
ISO 1182, Reaction to fire tests for building products – Non-combustibility test
ISO 7005-1, Metallic flanges – Part 1: Steel flanges
ISO 7005-2, Metallic flanges – Part 2: Cast iron flanges
ISO 7005-3, Metallic flanges – Part 3: Copper alloy and composite flanges

CR 1404, Determination of emissions from appliances burning gaseous fuels during type-testing

---------------------- Page: 8 ----------------------
SIST EN 621:2010
EN 621:2009 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Appliance and its constituent parts
3.1.1
non-domestic air heater

appliance designed for the heating and possibly ventilation of a building other than a single unit residential

dwelling
3.1.2
forced convection air heater

appliance designed to provide space heating from a central source by distributing heated air, by means of an

air moving device, either through ducting or directly into the heated space
3.1.3
gas inlet connection
the part of the appliance intended to be connected to the gas supply
3.1.4
mechanical joint
mechanical means of obtaining soundness

means of ensuring the soundness of an assembly of several (generally metallic) parts without the use of

liquids (e.g. pastes and tapes)

EXAMPLE Metal to metal joints; conical joints; toroidal sealing rings (“O” rings); flat joints.

3.1.5
gas circuit

part of the appliance that conveys or contains the gas between the appliance gas inlet connection and the

burner(s)
3.1.6
restrictor

device with an orifice, which is placed in the gas circuit so as to create a pressure drop and thus reduce the

gas pressure at the burner to a predetermined value for a given supply pressure and rate

3.1.7
gas rate adjuster

component allowing an authorised person to set the gas rate of the burner to a predetermined value according to

the supply conditions

NOTE 1 Adjustment can be progressive (screw adjuster) or in discrete steps (by changing restrictors).

NOTE 2 The adjusting screw of an adjustable regulator is regarded as a gas rate adjuster.

NOTE 3 The action of adjusting this device is called “adjusting the gas rate”.
NOTE 4 A factory sealed gas rate adjuster is considered to be non-existent.
3.1.8
setting an adjuster

immobilization of an adjuster (by some means such as e.g. a screw) after the manufacturer or installer has

adjusted it
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SIST EN 621:2010
EN 621:2009 (E)
3.1.9
sealing an adjuster

setting of an adjuster using a material such that any attempt to change the adjustment breaks the sealing

material and makes the interference with the adjuster apparent
NOTE 1 The adjuster is then said to be "sealed" in its adjustment position.
NOTE 2 A factory sealed adjuster is considered to be non-existent.

NOTE 3 A regulator is considered to be non-existent if it has been factory sealed in a position such that it is not

operational in the range of supply pressures corresponding to the appliance category.

3.1.10
putting an adjuster or a control out of service

putting an adjuster or a control (of temperature, pressure, etc.) out of action and sealing it in this position

NOTE The appliance then functions as if the adjuster or control had been removed.

3.1.11
injector
component that admits the gas into a burner
3.1.12
main burner
burner that is intended to assure the thermal function of the appliance
3.1.13
ignition device

means (e.g. flame, electrical ignition device or other device) used to ignite the gas at the ignition burner or at the

main burner
NOTE This device can operate intermittently or permanently.
3.1.14
ignition burner
burner whose flame is intended to ignite another burner
3.1.15
aeration adjuster

device enabling the air to be set at the desired value according to the supply conditions

NOTE The action of adjusting this device is called "adjusting the aeration".
3.1.16 combustion products circuit
3.1.16.1
combustion chamber
enclosure inside which combustion of the air-gas mixture takes place
3.1.16.2
flue outlet

the part of a Type B appliance that connects with a flue to evacuate the products of combustion

3.1.16.3
draught diverter

device placed in the combustion products circuit to reduce the influence of flue-pull and that of down-draught

on the burner performance and combustion
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SIST EN 621:2010
EN 621:2009 (E)
3.1.16.4
POCED

combustion products evacuation duct that is intended to be used only with a specific appliance/system, this

duct being either supplied with the appliance/system or specified in the manufacturers instructions

3.2 Adjustment, control and safety devices
3.2.1
range rating device

component on the appliance intended to be used by the installer to adjust the heat input of the appliance, within a

range of heat inputs stated by the manufacturer, to suit the actual heat requirements of the installation

NOTE This adjustment may be progressive (e.g. by use of a screw adjuster) or in discrete steps (e.g. by changing restrictors).

3.2.2
automatic burner control system

system comprising at least a programming unit and all the elements of a flame detector device

NOTE The various functions of an automatic burner control system may be in one or more housings. [EN 298:2003]

3.2.3
programming unit

device which reacts to signals from control and safety devices, gives control commands, controls the start-up

sequence, supervises the burner operation and causes controlled shut-down, and if necessary safety shut-

down and lock-out

NOTE The programming unit follows a predetermined sequence of actions and always operates in conjunction with a

flame detector device. [EN 298:2003]
3.2.4
programme

sequence of control operations determined by the programming unit involving switching on, starting up,

supervising and switching off the burner

NOTE Safety actions such as safety shut down and lock out are also part of the programme. [EN 298:2003]

3.2.5
flame detector device
device by which the presence of a flame is detected and signalled

NOTE A flame detector device can consist of a flame sensor, an amplifier and a relay for signal transmission. These

parts, with the possible exception of the actual flame sensor, may be assembled in a single housing for use in conjunction

with a programming unit. [EN 298:2003]
3.2.6
flame signal

signal given by the flame detector device, normally when the flame sensor senses a flame

[EN 298:2003]
3.2.7
flame simulation

condition which occurs when the flame signal indicates the presence of a flame when in reality no flame is

present
[EN 298:2003]
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SIST EN 621:2010
EN 621:2009 (E)
3.2.8
pressure regulator

device which maintains the outlet pressure constant independent of the variations in inlet pressure and/or flow

rate within defined limits
3.2.9
adjustable pressure regulator
regulator provided with means for changing the outlet pressure setting
3.2.10
flame supervisio
...

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