Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 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 domestic gas-fired air heaters 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, B11AS, B11BS, B41, B41AS, B41BS C11, C21, C31 and C41 appliances with an input not exceeding 70 kW (net cv-basis), intended primarily for use in single unit residential dwellings. Provision of the heated air may be by means of ducting.
This European Standard does not apply to:
a)   appliances of the condensing type;
b)   appliances for outdoor installation;
c)   dual purpose air conditioning appliances (heating and cooling);
d)   appliances where the air is heated by an intermediate fluid;
e)   appliances with forced draught burners;
f)   appliances fitted with a manual or automatic means of adjusting the combustion air supply or the combustion products evacuation (including flue dampers);
g)   portable or transportable forced convection appliances;
h)   appliances having multiple heating units with a single draught diverter;
i)   appliances fitted with more than one flue outlet;
j)   C21 and C41 appliances for 3rd family gases;
NOTE   For C41 appliances, see all requirements and test methods that are valid for C21 appliances, unless otherwise stated.
k)   appliances that are designed for continuous condensation within the flue system under normal operating conditions;
l)   appliances having Products Of Combustion Evacuation Ducts (POCED), that are non-metallic.
This European 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.

Gasbefeuerte Warmlufterzeuger mit erzwungener Konvektion zum Beheizen von Räumen für den häuslichen Gebrauch mit einer Nennwärmebelastung nicht über 70 kW, ohne Gebläse zur Beförderung der Verbrennungsluft und/oder Abgase

Diese Europäische Norm legt Anforderungen an und Prüfverfahren für die Sicherheit und Leistungsfähigkeit gasbefeuerter Warmlufterzeuger für den häuslichen Gebrauch mit einem oder mehreren Brennern ohne Gebläse und ohne ein Gebläse zur Beförderung der Verbrennungsluft und/oder des Rauchgases (nachfolgend kurz "Geräte" genannt) fest.
Diese Europäische Norm gilt für Geräte der Typen B11, B11AS, B11BS, B41, B41AS, B41BS, C11, C21, C31 und C41, deren Wärmebelastung 70 kW (bezogen auf den Heizwert) nicht übersteigt und die hauptsächlich für den Gebrauch in aus nur einer Einheit bestehenden Wohnungen bestimmt sind. Die Abgabe der Warmluft kann durch Leitungen erfolgen.
Diese Norm gilt nicht für:
a)   Geräte mit Brennwertnutzung;
b)   Geräte zur Aufstellung im Freien;
c)   Doppelzweck-Klimaanlagen (zum Heizen und Kühlen);
d)   Geräte, bei denen die Luft mittels einer Zwischenflüssigkeit erwärmt wird;
e)   Geräte mit Gasbrennern mit Gebläse;
f)   Geräte mit einer handbetätigten oder automatischen Einrichtung zur Einstellung der Verbrennungs-luftzufuhr oder der Abgasabführung (einschließlich Abgasdrosselklappen);
g)   tragbare oder transportable Geräte mit erzwungener Konvektion;
h)   Geräte mit mehreren Heizelementen mit nur einer Strömungssicherung;
i)   Geräte mit mehr als einem Abgasstutzen;
j)   Geräte der Bauarten C21 und C41 für Gase der dritten Familie.
ANMERKUNG      Für Geräte der Bauart C41 siehe alle Anforderungen und Prüfverfahren für Geräte der Bauart C21, wenn nichts anderes vermerkt ist.
k)   Geräte, die innerhalb der Abgasleitungen bei den üblichen Betriebsbedingungen für andauernde Konden-sation ausgelegt sind;
l)   Geräte mit Abgasleitungen aus nichtmetallischen Werkstoffen (POCEDs).
Diese Norm ist nur anwendbar für Geräte, die für eine Typprüfung vorgesehen sind. (...)

Générateurs d'air chaud à convection forcée utilisant les combustibles gazeux pour le chauffage de locaux à usage d'habitation de débit calorifique sur Hi inférieur ou égal à 70 kW, sans ventilateur pour aider l'alimentation en air comburant et/ou l'évacuation des produits de combustion

La présente norme établit les exigences et les méthodes d'essais relatives à la sécurité et au rendement des
générateurs d'air chaud à usage domestique utilisant les combustibles gazeux comportant un ou plusieurs
brûleurs atmosphériques et sans ventilateur pour 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 type B11, B11AS, B11BS, B41, B41AS, B41BS, C11, C21,
C31 et C41 dont le débit calorifique est inférieur ou égal à 70 kW (sur Hi) et qui sont destinés en particulier à
être utilisés dans l'habitat individuel. L'écoulement de l'air chaud peut se faire par des gaines.
La présente norme ne s'applique pas :
a) aux appareils à condensation ;
b) aux appareils destinés à une installation extérieure ;
c) aux appareils de climatisation à usage double (chauffage et refroidissement de l'air) ;
d) aux appareils de chauffage de l'air par un fluide caloporteur intermédiaire :
e) aux appareils à brûleurs avec ventilateur ;
f) 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) ;
g) aux appareils à convection forcée portatifs ou transportables ;
h) aux appareils comportant plusieurs générateurs de chaleur associés à un seul coupe-tirage
antirefouleur ;
i) aux appareils comportant plusieurs buses d'évacuation ;
j) aux appareils de types C21 et C41 utilisant les gaz de la troisième famille.
NOTE Pour les appareils de type C41, voir l'ensemble des exigences et méthodes d'essais s'appliquant aux appareils
de type C21, sauf indication contraire.
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.

Plinski gospodinjski grelniki zraka s prisilno konvekcijo za gretje prostorov z imensko močjo do vključno 70 kW brez ventilatorja za zgorevalni zrak in/ali produkte zgorevanja

Ta evropski standard določa zahteve in preskusne metode za varnost in učinkovitost plinskih gospodinjskih grelnikov zraka z ventilatorjem za zgorevalni zrak in/ali dimne pline, v nadaljevanju »aparatov«. Ta evropski standard velja za tipe aparatov B11, B11AS, B11BS, B41, B41AS, B41BS, C11, C21, C31 in C41 z dovodom, ki ne presega 70 kW (neto kalorična osnova), namenjenim predvsem za uporabo v posameznih enotah stanovanjskih objektov. Preskrbovanje s segretim zrakom lahko poteka preko vodov. Ta evropski 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
20-Oct-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 778:2010
01-februar-2010
1DGRPHãþD
SIST EN 778:1999
SIST EN 778:1999/A1:2002
3OLQVNLJRVSRGLQMVNLJUHOQLNL]UDNDVSULVLOQRNRQYHNFLMR]DJUHWMHSURVWRURY]
LPHQVNRPRþMRGRYNOMXþQRN:EUH]YHQWLODWRUMD]D]JRUHYDOQL]UDNLQDOL
SURGXNWH]JRUHYDQMD

Domestic gas-fired forced convection air heaters for space heating not exceeding a net

heat input of 70 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 häuslichen Gebrauch mit einer Nennwärmebelastung nicht über 70 kW,

ohne Gebläse zur Beförderung der Verbrennungsluft und/oder der Abgase

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

chauffage de locaux à usage d'habitation de débit calorifique sur Hi inférieur ou égal à 70

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 778:2009
ICS:
97.100.20 Plinski grelniki Gas heaters
SIST EN 778:2010 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 778:2010
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SIST EN 778:2010
EUROPEAN STANDARD
EN 778
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2009
ICS 97.100.20 Supersedes EN 778:1998
English Version
Domestic gas-fired forced convection air heaters for space
heating not exceeding a net heat input of 70 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 à usage Konvektion zum Beheizen von Räumen für den häuslichen

d'habitation de débit calorifique sur Hi inférieur ou égal à 70 Gebrauch mit einer Nennwärmebelastung nicht über 70

kW, sans ventilateur pour aider l'alimentation en air kW, ohne Gebläse zur Beförderung der Verbrennungsluft

comburant et/ou l'évacuation des produits de combustion und/oder der Abgase
This European Standard was approved by CEN on 12 September 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 778:2009: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 778:2010
EN 778:2009 (E)
Contents Page

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

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

2 Normative references ............................................................................................................................7

3 Terms and definitions ...........................................................................................................................8

3.1 Appliance and its constituent parts .....................................................................................................8

3.2 Adjustment, control and safety devices ........................................................................................... 10

3.3 Operation of the appliance ................................................................................................................ 13

3.4 Gases ................................................................................................................................................... 15

3.5 Conditions of operation and measurement ..................................................................................... 16

3.6 Marking of the appliance and packaging ......................................................................................... 17

4 Classification ....................................................................................................................................... 17

4.1 Classification of gases ....................................................................................................................... 17

4.2 Classification of appliance ................................................................................................................ 18

5 Construction and design requirements ........................................................................................... 21

5.1 General ................................................................................................................................................. 21

5.2 Adjusting, control and safety devices .............................................................................................. 27

5.3 Ignition devices ................................................................................................................................... 31

5.4 Flame supervision system ................................................................................................................. 31

5.5 Start-gas flame establishment ........................................................................................................... 32

5.6 Main flame establishment .................................................................................................................. 33

5.7 Main burner ......................................................................................................................................... 33

5.8 Facility for remote control ................................................................................................................. 34

5.9 Thermostats and control of air temperature .................................................................................... 34

5.10 Gas pressure test points .................................................................................................................... 35

6 Operational requirements .................................................................................................................. 35

6.1 Safety of operation ............................................................................................................................. 35

6.2 Efficiency ............................................................................................................................................. 41

7 Test methods ....................................................................................................................................... 42

7.1 General ................................................................................................................................................. 42

7.2 Construction and design ................................................................................................................... 49

7.3 Safety of operation ............................................................................................................................. 50

7.4 Efficiency ............................................................................................................................................. 82

8 Marking and instructions ................................................................................................................... 87

8.1 Marking of the appliance .................................................................................................................... 87

8.2 Marking of the packaging .................................................................................................................. 88

8.3 Utilization of symbols on the appliance and packaging ................................................................. 89

8.4 Instructions ......................................................................................................................................... 91

9 Evaluation of POCED conformity and their associated terminals ................................................. 93

9.1 General ................................................................................................................................................. 93

9.2 Type testing ......................................................................................................................................... 93

9.3 Factory production control (FPC) ..................................................................................................... 93

Annex A (informative) National situations ................................................................................................... 96

A.1 General ................................................................................................................................................. 96

A.2 Categories listed in the body of the standard and marketed in different countries .................... 96

A.3 Appliance supply pressures corresponding to the categories given in A.2 ................................ 98

A.4 Special categories marketed nationally or locally .......................................................................... 99

A.5 Test gases corresponding to the special categories given in A.4 .............................................. 105

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SIST EN 778:2010
EN 778:2009 (E)

A.6 Gas connections in the various countries ...................................................................................... 108

A.7 Flue connections in the various countries ..................................................................................... 110

Annex B (informative) Equivalence rules .................................................................................................... 111

B.1 Conversion to categories within a restricted Wobbe index range ............................................... 111

B.2 Conversion to categories within an identical Wobbe index range............................................... 111

B.3 Conversion to categories within a wider Wobbe index range ...................................................... 112

Annex C (informative) A-deviations .............................................................................................................. 113

C.1 General ............................................................................................................................................... 113

C.2 Switzerland ......................................................................................................................................... 113

Annex D (normative) Special national conditions ....................................................................................... 114

D.1 Special national conditions .............................................................................................................. 114

D.2 Belgium............................................................................................................................................... 114

D.3 Italy ...................................................................................................................................................... 114

D.4 Poland ................................................................................................................................................. 114

Annex E (informative) Identification of gas types in use in various countries ......................................... 115

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

Members of CEN ................................................................................................................................ 116

F.1 Categories listed in the body of the standard and marketed in different countries .................. 116

F.2 Appliance supply pressures corresponding to the categories given in F.1 ............................... 116

F.3 Special categories marketed nationally or locally ......................................................................... 116

F.4 Gases and test pressures corresponding to the special categories given in F.3 ...................... 116

Annex G (informative) Calculation of conversions of NOx ......................................................................... 117

Annex H (informative) An example of sampling plans ................................................................................ 118

H.1 Sampling plans .................................................................................................................................. 118

H.2 Inspection levels and procedures ................................................................................................... 119

Annex ZA (informative) .................................................................................................................................... 120

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

Construction Products Directive ..................................................................................................... 122

ZB.1 Scope and relevant characteristics ................................................................................................. 122

ZB.2 Procedure(s) for attestation of conformity of [construction products] ....................................... 124

ZB.3 CE marking and labelling.................................................................................................................. 126

Bibliography .................................................................................................................................................... 128

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SIST EN 778:2010
EN 778:2009 (E)
Foreword

This document (EN 778:2009) has been prepared by Technical Committee CEN/TC 180 “Domestic and non-

domestic gas fired air heaters and non-domestic gas fired 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 April 2010, and conflicting national standards shall be withdrawn at the

latest by April 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 778:1998.

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 Annex ZA, and Annex ZB, which are integral parts of this

document.

This revision modifies EN 778:1998. 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 M 105. 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.3.3 and A.3.4 implies that the general requirements described in the body of the standard (see 4.1.1, 4.2.2,

4.2.3 and 4.2.5) also apply to these special categories.

 EN 525, Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a

net heat input of 300 kW

 EN 621, 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

 EN 1020, Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net

heat input of 300 kW, incorporating a fan to assist transportation of combustion air and/or combustion

products

 EN 1196, Domestic and non-domestic gas-fired air heaters ― Supplementary requirements for

condensing air heaters

 EN 1319, Domestic gas-fired forced convection air heaters for space heating, with fan-assisted burners

not exceeding a net heat input of 70 kW

 EN 12669, Direct gas-fired hot air blowers for use in greenhouses and supplementary non-domestic

space heating
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SIST EN 778:2010
EN 778:2009 (E)

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: 7 ----------------------
SIST EN 778:2010
EN 778:2009 (E)
1 Scope

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

gas-fired air heaters 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 , B , B , B , B C , C , C and C appliances

11 11AS 11BS 41 41AS 41BS 11 21 31 41

with an input not exceeding 70 kW (net cv-basis), intended primarily for use in single unit residential dwellings.

Provision of the heated air may be by means of ducting.
This European Standard does not apply to:
a) appliances of the condensing type;
b) appliances for outdoor installation;
c) dual purpose air conditioning appliances (heating and cooling);
d) appliances where the air is heated by an intermediate fluid;
e) appliances with forced draught burners;

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

combustion products evacuation (including flue dampers);
g) portable or transportable forced convection appliances;
h) appliances having multiple heating units with a single draught diverter;
i) appliances fitted with more than one flue outlet;
j) C and C appliances for 3rd family gases;
21 41

NOTE For C appliances, see all requirements and test methods that are valid for C appliances, unless otherwise

41 21
stated.

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

conditions;

l) appliances having Products Of Combustion Evacuation Ducts (POCED), that are non-metallic.

This European 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.
---------------------- Page: 8 ----------------------
SIST EN 778:2010
EN 778:2009 (E)
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 88-1:2007, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure

regulators for inlet pressures up to and including 500 mbar

EN 125:1991, Flame supervision devices for gas burning appliances — Thermo-electric flame supervision

devices
EN 126:2004, Multifuctional controls for gas burning appliances
EN 161:2007, Automatic shut-off valves for gas burners and gas appliances
EN 257:1992, 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 10226-1:2004, 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 10226-2:2005, 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 60335-1:2002, Household and similar electrical appliances — Safety — Part 1: General requirements (IEC

60335-1:2001, modified)

EN 60335-2-102:2006, 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 60529:1992, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)

EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: General requirements

(IEC 60730-1:1999, modified)

EN 60730-2-1:1997, Automatic electrical controls for household and similar use — Part 2-1: Particular

requirements for electrical controls for electrical household appliances (IEC 60730-2-1:1989, 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 61058-1:2002, Switches for appliances — Part 1: General requirements (IEC 61058-1:2000 + A1:2001,

modified)

EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads — Part 1:

Dimensions, tolerances and designation (ISO 228-1:2000)

EN ISO 3166-1:2006, Codes for the representation of names of countries and their subdivisions Part 1:

Country codes (ISO 3166-1:2006)
---------------------- Page: 9 ----------------------
SIST EN 778:2010
EN 778:2009 (E)

EN ISO 6976:2005, Natural gas — Calculation of the calorific value, density, relative density and Wobbe index

from composition (ISO 6976:1995 including Corrigendum 1:1997, Corrigendum 2:1997 and Corrigendum

3:1999)

ISO 1182:2002, Reaction to fire tests for building products — Non-combustibility test

ISO 7005-1:1992, Metallic flanges — Part 1: Steel flanges
ISO 7005-2:1988, Metallic flanges — Part 2: Cast iron flanges
ISO 7005-3:1988, Metallic flanges — Part 3: Copper alloy and composite flanges

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

3 Terms and definitions
3.1 Appliance and its constituent parts
3.1.1
domestic air heater

appliance designed for the heating by means of warm air and possibly ventilation of 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
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

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SIST EN 778:2010
EN 778:2009 (E)
3.1.7
gas rate adjuster

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

to the supply conditions

NOTE 1 Adjustment may 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 setting an adjuster
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;
the adjuster is then said to be "sealed" in its adjustment position
NOTE 1 A factory sealed adjuster is considered to be non-existent.

NOTE 2 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 (e.g. of temperature, pressure) out of action and sealing it in this position

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

any 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
---------------------- Page: 11 ----------------------
SIST EN 778:2010
EN 778:2009 (E)
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 circuit

combustion circuit comprises the air supply circuit, the combustion chamber, the heat exchanger and the

combustion products evacuation circuit so far as this is part of the appliance
3.1.17
combustion chamber
enclosure inside which combustion of the air-gas mixture takes place
3.1.18
flue outlet

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

3.1.19
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
3.1.20
flue terminal

device fitted at the end of the duct system which enables the discharge of flue gases and may, at the same

time, allow entry of combustion air
3.1.21
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 system

burner system in which, when starting from the completely shut-down condition, the start–gas flame is

detected and proved and the main gas valve(s) is(are) actuated without manual intervention

3.2.3
automatic burner control system

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

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

3.2.4
non-automatic burner control system
burner system with an ignition burner which is ignited manually
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SIST EN 778:2010
EN 778:2009 (E)
3.2.5
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 an
...

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