Classification of gas appliances according to the method of supplying combustion air and of evacuation of the combustion products (types)

This European Standard gives details for the classification of gas  appliances according to the method of supplying combustion air  and of evacuating the products of combustion. […]  This European Standard is a guide for the harmonization of  products standards, for the preparation of installation standards  and for the common understanding of the types of gas Appliances.

Klassifizierung von Gasgeräten nach der Art der Verbrennungsluftzuführung und Abgasabführung (Arten)

Dieses Dokument stellt Details für die Klassifizierung von Gasgeräten nach der Art der Verbrennungsluftzuführung und der Abgasabführung (Arten) dar. Diese Klassifizierung bezieht sich auf Gasgeräte, die dafür vorgesehen sind, in Gebäuden und/oder außerhalb von Gebäuden installiert zu werden .
Das Dokument klassifiziert die Gasgeräte als Arten A, B oder C entsprechend dem Grundprinzip zur Abführung der Abgase und Verbrennungsluftzuführung.
Dieses Dokument ist eine Bezugsnorm zur harmonisierung der Produktnormen für Gasgeräte, zur Erarbeitung von Aufstell- und Installationsanforderungen der Gasgeräte und für ein einheitliches Verständnis der Arten der Gasgeräte.
Dieses Dokument ist weder eine Installationsnorm noch eine Produktnorm.
Mit der Verweisung auf ein Gasgerät oder Gasgeräte, das/die über „seine“ bzw. über „ihre“ Leitung bzw. Leitungen angeschlossen ist/sind, wird ausgedrückt, dass diese Leitungen zur Verbrennungsluftzuführung und/oder Abgasabführung als Teil des Gasgeräts gelten. Dies bedeutet, dass solche Leitungen zusammen mit dem Gasgerät zertifiziert sind. Der informative Anhang C beschreibt für die Gasgerätearten, die für den Anschluss an separate Abgasanlagen vorgesehen sind, welche Teile der Abgasanlage separat geliefert werden und welche Bestandteil des Gebäudes sein können
Im Verständnis dieses Dokuments ist eine „einzelne Leitung“ eine Abgasleitung, die so ausgelegt und ausgeführt ist, dass sie für nur ein Gasgerät Abgas abführt und/oder Verbrennungsluft zuführt.
Im Verständnis dieses Dokuments ist eine „gemeinsame Leitung“ eine Abgasleitung, die so ausgelegt und ausgeführt ist, dass sie für mehr als ein Gasgerät Abgas abführt und/oder Verbrennungsluft zuführt.

Classification des appareils utilisant les combustibles gazeux selon le mode d'amenée d'air comburant et le mode d'évacuation des produits de combustion (types)

Le présent document donne des précisions sur la classification des appareils à gaz suivant le mode d'amenée d'air comburant et le mode d'évacuation des produits de combustion (types). Cette classification concerne les appareils à gaz destinés à être installés à l'intérieur et/ou à l'extérieur des bâtiments .
Le document classe les appareils en type A, B ou C selon le principe de base d'évacuation des produits de combustion et d'amenée d'air.
Le présent document est un guide pour l'harmonisation des normes de produits, pour la préparation des normes d'installation et pour la compréhension commune des types d'appareils à gaz.
Le présent document n'est ni une norme d'installation ni une norme de produit.
En référence à l'appareil ou aux appareils à gaz raccordés via « leur(s) » conduit(s), il est entendu que le conduit d'amenée d'air et/ou le conduit d'évacuation des produits de combustion font partie de l'appareil. Ceci signifie que ces conduits sont certifiés avec l'appareil. L'Annexe C informative identifie les types d'appareils destinés à être raccordés à un conduit de fumée séparé qui peut faire partie du bâtiment.
Au sens du présent document, un « conduit individuel » est un conduit conçu pour évacuer les produits de combustion et/ou assurer l'amenée d'air pour un seul appareil.
Au sens du présent document, un « conduit collectif » est un conduit conçu pour évacuer les produits de combustion et/ou assurer l'amenée d'air pour plus d'un appareil.

Razvrščanje plinskih aparatov glede na način dovajanja zgorevalnega zraka in odvajanja produktov zgorevanja (tipi)

General Information

Status
Published
Public Enquiry End Date
09-Jan-2019
Publication Date
09-Mar-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Feb-2020
Due Date
11-Apr-2020
Completion Date
10-Mar-2020

RELATIONS

Buy Standard

Standard
SIST EN 1749:2020
English language
48 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 1749:2020
01-april-2020
Nadomešča:
SIST-TP CEN/TR 1749:2014
Razvrščanje plinskih aparatov glede na način dovajanja zgorevalnega zraka in
odvajanja produktov zgorevanja (tipi)

Classification of gas appliances according to the method of supplying combustion air and

of evacuation of the combustion products (types)
Klassifizierung von Gasgeräten nach der Art der Verbrennungsluftzuführung und
Abgasabführung (Arten)

Classification des appareils utilisant les combustibles gazeux selon le mode d'amenée

d'air comburant et le mode d'évacuation des produits de combustion (types)
Ta slovenski standard je istoveten z: EN 1749:2020
ICS:
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
SIST EN 1749:2020 en

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

---------------------- Page: 1 ----------------------
SIST EN 1749:2020
---------------------- Page: 2 ----------------------
SIST EN 1749:2020
EN 1749
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 91.140.40 Supersedes CEN/TR 1749:2014
English Version
Classification of gas appliances according to the method of
supplying combustion air and of evacuation of the
combustion products (types)

Classification des appareils utilisant les combustibles Klassifizierung von Gasgeräten nach der Art der

gazeux selon le mode d'amenée d'air comburant et le Verbrennungsluftzuführung und Abgasabführung

mode d'évacuation des produits de combustion (types) (Arten)
This European Standard was approved by CEN on 13 October 2019.

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

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1749:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

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

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

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

3 Terms and definitions ................................................................................................................................... 6

4 General scheme ............................................................................................................................................... 6

4.1 General ............................................................................................................................................................... 6

4.2 Type A ................................................................................................................................................................. 7

4.3 Type B ................................................................................................................................................................. 7

4.4 Type C .................................................................................................................................................................. 9

5 Supplementary classification scheme for type A and type B appliances fitted with

particular safety devices ............................................................................................................................ 14

6 Supplementary classification scheme for type B appliances for use in limited

installation conditions ................................................................................................................................ 14

6.1 Type B appliance utilizing a third subscript “D” .............................................................................. 14

6.2 Type B appliances utilizing a third subscript “P” ............................................................................ 14

7 Supplementary classification scheme for type C appliances for use in limited

installation conditions — Type C appliances utilizing a third subscript “R” ........................ 15

Annex A (normative) Classification according to the evacuation of the combustion products

and air inlet ..................................................................................................................................................... 16

Annex B (informative) Special appliance classification (types) .............................................................. 37

Annex C (informative) Appliance types designed for connection to separate chimney

products ........................................................................................................................................................... 48

---------------------- Page: 4 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
European foreword

This document (EN 1749:2020) has been prepared by Technical Committee CEN/TC 238 “Test gases,

test pressures, appliance categories and gas appliance types”, 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 July 2020, and conflicting national standards shall be

withdrawn at the latest by July 2020.

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 CEN/TR 1749:2014.
The main changes compared to the previous edition are listed below:

— editorial changes, a reviewed wording and a reviewed structure compared to the TR version

(CEN/TR 1749:2014);

— some technical items generally described in the foreword of the former TR are now included in the

scope or in other clauses of the standard (1; 4.1; 4.4);
— a clause on normative references has been included (Clause 2);
— a clause on terms and definitions has been included (Clause 3);
— examples of reworded clauses:
— Type B (4.3);
— Type C6 (4.4);
— Type C(11) (4.4);
— Type C(13) (4.4);
— Type C(14) (4.4).

— a key for figures has been added and some figures have been modified, according to the key adopted

(Annex A);

— Annex B has a wider application than Germany. Due to this change, the former Annex D has been

deleted;
— Annex C replaces the former Annex E;
— The former Annex C has been deleted.
The user is advised to compare the previous text with the current version.

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, France, Germany, Greece, Hungary, Iceland, Ireland,

Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

---------------------- Page: 5 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
Introduction

This document has been prepared to provide reference scheme for classification of gas appliances to

CEN Technical Committees who are preparing European Standards for appliances burning combustible

gases.

It gives details of a general scheme for the classification of such appliances according to the method of

air supply and evacuating the combustion products. This document concerns gas appliances that are

intended to be installed within buildings or outside buildings. Nevertheless, it is recognized that this

appliance classification scheme could be utilized in other circumstances. For example, in the case of

appliances capable of utilizing other fuels.

This form of appliance classification is widely used in the preparation of European Standards for gas

appliances to identify the requirements and methods of test that are applicable to the various methods

of evacuating the combustion products and air supply. Appliances classified in this way are generally

described as “types” and this description has been retained for the purposes of this document.

The definitions are written intentionally in very general terms in order to cover any possible variations

in the basic appliance types.

The main purpose of the document is to promote harmonization in the classification of appliance types.

This should ensure that there is a clear understanding of the various appliance types and will avoid

confusion arising from Technical Committees describing them in different ways. CEN Technical

Committees are therefore requested to use this document as reference in all circumstances in which it is

appropriate. They should not deviate from it unless there are relevant technical reasons for doing so.

In the preparation of this scheme it was noted that there were methods of evacuating combustion

products that were particular to a specific Technical Committee or to a particular gas appliance. These

particular methods have not been included in the present scheme because, as indicated above, the main

purpose of the scheme is to promote harmonization across Technical Committees.

However, it is intended that this scheme should be reviewed from time to time in order to consider its

extension to other, possibly new, methods of evacuating combustion products. At that time, such specific

methods of evacuating combustion products may be included at the request of the Technical

Committees concerned.
---------------------- Page: 7 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
1 Scope

This document gives details for the classification of gas appliances according to the method of supplying

combustion air and of evacuating the combustion products (types). This classification refers to gas

appliances that are intended to be installed within buildings and/or outside of the building .

The document classifies appliances as type A, B or C according to the basic principle for the evacuation

of the combustion products and air inlet.

This document is the reference for the harmonization of product standards, for the preparation of

installation standards and for the common understanding of the types of gas appliances.

This document is neither an installation standard nor a product standard.

In references to a gas appliance or gas appliances connected via “its” or “their” duct or ducts, it is

intended that the air inlet duct and/or the discharge duct for carrying any combustion products are part

of the gas appliance. This means that such ducts are certified together with the gas appliance.

Informative Annex C identifies appliance types that are designed for connection to separate chimney

products, which may be part of the construction of the building.

In terms of this document, a “single duct” is a flue duct designed and capable of discharging the

combustion products and/or air inlet duct for the air supply for only one appliance.

In terms of this document, a “common duct” is a flue duct designed and capable of discharging the

combustion products and/or air inlet duct for the air supply for more than one appliance.

2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
4 General scheme
4.1 General

The general scheme for Type A, Type B and Type C appliances is given in 4.2, 4.3 and 4.4 respectively.

A series of subscript numbers is used in addition to these letters to identify specific variations within

these basic principles.

Where this first subscript number exceeds “9” it is given in brackets to clarify that it is a single subscript

number and not two subscript numbers.

1) If the appliance is installed outside of the building (if this circumstance is explicitly allowed by the

manufacturer) it will not change its classification (i.e.: a type B appliance will remain a type B if installed

53 53

outside according to manufacturer instructions). These appliances are subject to specific additional requirements

and tests, according to specific product standards.
---------------------- Page: 8 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)

The last subscript number of each specific variation indicates the absence or presence of an integral fan

for the supply of combustion air and/or for the evacuation of the combustion products.

If the last subscript number is “1”, no integral fan for the supply of combustion air and/or for the

evacuation of the combustion products is present. Where a fan is present, the numbers 2, 3 or 4 are

given. These three numbers are used solely to identify the location of this fan.

Figures are also given in Annex A to assist in the identification of the various appliance types.

Those pictures are to be considered as examples; for each type, they do not represent all the possible

details of applications.

In order to provide information about appliance types that are recognized in certain CEN Member

States, Annex B has been included with reference to subscript letter “X".
4.2 Type A

An appliance not intended for connection to a flue or to a device for evacuating the combustion products

to the outside of the room in which the appliance is installed.
Type A . An appliance without a fan.

Type A . An appliance with a fan downstream of the combustion chamber/heat exchanger.

Type A . An appliance with a fan upstream of the combustion chamber/heat exchanger.

4.3 Type B

An appliance intended to be connected to a flue that evacuates the combustion products to the outside

of the room containing the appliance. The combustion air is drawn directly from the room.

Type B . A type B appliance incorporating a draught diverter, marketed without duct systems, intended

to be connected to a separately approved and marketed system for discharge of the combustion

products.
Type B . A natural draught type B1 appliance.

Type B . A type B appliance designed for a natural draught flue incorporating a fan downstream of

12 1
the combustion chamber/heat exchanger and upstream of the draught diverter.

Type B . A type B appliance designed for a natural draught flue incorporating a fan upstream of the

13 1
combustion chamber/heat exchanger.

Type B . A type B appliance having an integral fan downstream of both the combustion

14 1
chamber/heat exchanger and the draught diverter.

Type B . A type B appliance without a draught diverter, marketed without duct systems, intended to be

connected to a separately approved and marketed system for discharge of the combustion products.

Type B . A natural draught type B appliance.
21 2

Type B . A type B appliance incorporating a fan downstream of the combustion chamber/heat

22 2
exchanger.

2) A type B appliance will not generally be included in the scope of European Standards for gas appliances.

However, it may apply in special circumstances, e.g. gas-fired incinerators.
---------------------- Page: 9 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)

Type B . A type B appliance incorporating a fan upstream of the combustion chamber/heat

23 2
exchanger.

Type B . A type B appliance without a draught diverter, which is designed for connection via its

concentric duct to a common duct system. This common duct system consists of a single natural draught

flue. All pressurized parts of the appliance containing combustion products are completely enclosed by

parts of the appliance supplying combustion air. Combustion air is drawn into the appliance from the

room by means of a concentric duct, which encloses the flue. The air enters through defined orifices

situated in the surface of the duct.
Type B . A natural draught type B appliance.
31 3
Appliances of this type are not foreseen.

Type B . A type B appliance incorporating a fan downstream of the combustion chamber/heat

32 3
exchanger.

Type B . A type B appliance incorporating a fan upstream of the combustion chamber/heat

33 3
exchanger.

Type B . A type B appliance, incorporating a draught diverter, that is designed for connection via its

flue duct to its flue terminal.
Type B . A natural draught type B appliance.
41 4

Type B . A type B appliance designed for a natural draught flue incorporating a fan downstream of

42 4
the combustion chamber/heat exchanger and upstream of the draught diverter.

Type B . A type B appliance designed for a natural draught flue incorporating a fan upstream of the

43 4
combustion chamber/heat exchanger.

Type B . A type B appliance having an integral fan downstream of both the combustion

44 4
chamber/heat exchanger and the draught diverter.

Type B . A type B appliance, without a draught diverter, that is designed for connection via its flue duct

to its flue terminal.
Type B . A natural draught type B5 appliance.

Type B . A type B appliance incorporating a fan downstream of the combustion chamber/heat

52 5
exchanger.

Type B . A type B appliance incorporating a fan upstream of the combustion chamber/heat

53 5
exchanger.

3) Type B appliances installed in mobile homes (caravan holiday homes) are commonly described as “closed

flue” appliances; this terminology being used in EN 1949, which covers the installation of such appliances.

4) A type B appliance will not generally be included in the scope of European Standards for gas appliances.

However, it may apply in special circumstances, e.g. gas-fired incinerators.
---------------------- Page: 10 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
4.4 Type C

An appliance in which the combustion circuit (air supply, combustion chamber, heat exchanger and

evacuation of the combustion products) is sealed with respect to the room in which the appliance is

installed.

Type C . A type C appliance that is designed for connection via its ducts to its horizontal terminal,

which at the same time admits fresh air to the burner and discharges the combustion products to the

outside through orifices that are either concentric or close enough to come under similar wind

conditions.
Type C . A natural draught type C appliance.
11 1

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

12 1
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

13 1
exchanger.

Type C . A type C appliance connected via its two ducts to a common duct system serving more than

one appliance. This system consists of a single duct, which supplies the combustion air and evacuates

the combustion products .
Type C . A natural draught type C appliance.
21 2

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

22 2
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

23 2
exchanger.

Type C . A type C appliance that is designed for connection via its ducts to a vertical terminal, which at

the same time admits fresh air to the burner and discharges the combustion products to the outside

through orifices that are either concentric or close enough to come under similar wind conditions.

Type C . A natural draught type C appliance.
31 3

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

32 3
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

33 3
exchanger.

Type C . A type C appliance connected via its two ducts to a common natural draught duct system

designed for more than one appliance. This common duct system consists of two ducts connected to a

terminal, which at the same time admits fresh air to the burner and discharges the combustion products

to the outside through orifices that are either concentric or close enough to come under similar wind

conditions.

5) This common duct system is part of the building and not a part of the appliance.

6) This appliance type is now obsolete and unlikely to be called up in future European Standards for gas

appliances.

7) This common duct system is part of the building and not a part of the appliance.

---------------------- Page: 11 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)
Type C . A natural draught type C appliance.
41 4

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

42 4
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

43 4
exchanger.

Type C . A type C appliance connected via its separate ducts to its separate terminals for the supply of

combustion air and the evacuation of the combustion products. These ducts may terminate in zones of

different pressure.
Type C . A natural draught type C appliance.
51 5

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

52 5
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

53 5
exchanger.

Type C . A type C appliance which is intended to be connected to a separately approved and marketed

system for the supply of combustion air and discharge of the combustion products.

Pictures for type C appliances have not been included. This is because such appliances are marketed

without duct systems. When installed such an appliance will have a configuration similar to one of the

arrangements shown for other type C appliances, according to manufacturer’s instructions.

Appliance Technical Committees have the responsibility for inclusion of requirements and methods of

test in their standards to ensure that type C appliances are suitable for their intended method of

supplying combustion air and of evacuation of the combustion product.
Type C . A natural draught type C appliance.
61 6

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

62 6
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

63 6
exchanger.

Type C . A type C appliance in which the combustion air supply and the combustion products

evacuation is provided by its two vertical ducts. The combustion air is taken from a loft and the

combustion products are discharged above the roof. A draught diverter is incorporated in the

combustion products evacuation duct at a location above the combustion air inlet orifice(s) .

Type C . A natural draught type C appliance.
71 7

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

72 7
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

73 7
exchanger.

8) This appliance type is now obsolete and unlikely to be called up in future European Standards for gas

appliances.
---------------------- Page: 12 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)

Type C . A type C appliance connected via one of its ducts to a single or common duct system . This

duct system consists of a natural draught duct (i.e. not incorporating a fan) that evacuates the

combustion products. The appliance is connected via a second of its ducts to a terminal, which supplies

air to the appliance from outside the building.
10)
Type C . A natural draught type C appliance.
81 8

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

82 8
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

83 8
exchanger.

Type C . A type C appliance that is designed for connection via its flue duct to its vertical terminal and

via its air inlet duct to an existing vertical duct. The terminal at the same time admits fresh air to the

burner and discharges the combustion products to the outside through orifices that are either

concentric or close enough to come under similar wind conditions.
11)

The air inlet duct , or part of it, is an existing vertical duct within the building, e.g. a converted

chimney.
Type C .A natural draught type C appliance.
91 9

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

92 9
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

93 9
exchanger.
12)

Type C A type C appliance connected via its two ducts to a common duct system designed for

(10)

more than one appliance. This common duct system consists of two ducts connected to a terminal,

which at the same time admits fresh air to the burner and discharges the combustion products to the

outside through orifices that are either concentric or close enough to come under similar wind

conditions.

The C appliance is designed to become connected to a common duct system that is designed to

(10)

operate under the conditions where the static pressure in the common flue duct might exceed the static

pressure in the common air duct.

Type C . A type C appliance incorporating a fan downstream of the combustion chamber/heat

(10)2 (10)
exchanger.

Type C . A type C appliance incorporating a fan upstream of the combustion chamber/heat

(10)3 (10)
exchanger.

9) This single or common duct system is part of the building and not a part of the appliance.

10) A type C appliance will not generally be included within the scope of European Standards for gas

appliances.

11) The vertical air inlet duct is part of the building and not a part of the appliance.

12) This common duct system is part of the building and not a part of the appliance.

---------------------- Page: 13 ----------------------
SIST EN 1749:2020
EN 1749:2020 (E)

Type C A type C appliance consisting of an assembly of two or more generally identical appliance

(11).

modules, connecting ducts, a common flue duct, a common air duct, where the static pressure in the

common flue ducts might exceed the static pressure in the air ducts and where the orifices of air duct

and the flue duct to the outside are either concentric, or close enough to come under similar wind

conditions.

A C appliance is designed to be assembled by connecting its appliance modules via its ducts to its

(11)

common ducts. These common ducts consist of two ducts connected to their terminals, which at the

same time admit fresh air to the burner of each appliance module, and discharges the combustion

products of each appliance module to the outside through orifices that are either concentric or close

enough to come under similar wind conditions. The appliance has a single air inlet and a single flue

outlet.

The C appliance, made by an assembly of two or more modules, is designed as a single appliance;

(11)

each appliance module is capable of independent operation and it consists of a heat exchanger, burner,

control and safety devices.
The C appliance is evaluated and certified in analogy with the types C , C , C .
(11) 1 3 5
Type C . A type C appliance is an assembly of two or more appliance modules each
(11)2 (11)
incorporating a fan downstream of the combustion chamber/heat exchanger.
Type C . A type C appliance is an assembly of two or more appliance modules each
(11)3 (11)
incorporating a fan upstream of the combustion chamber/heat exchanger.
13)

Type C . A type C appliance connected via one of its ducts to a common flue duct system . The

(12)
appliance is connected via a second of its ducts to its terminal, which supplies
...

Questions, Comments and Discussion

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