Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW

This European Standard specifies the requirements and test methods for the safety of non domestic direct gas fired forced convection air heaters having fully automatic control systems, hereafter referred to as "appliances".
This European Standard applies to appliances of type A2 and type A3 with heat input based on the net calorific value of 300 kW or less fitted with integral burners intended for use other than in residential dwellings.  It also applies to appliances designed for outdoor installation. For indoor appliances 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 residential dwellings;
b)   portable or transportable forced convection appliances;
c)   appliances fitted with gas boosters;
d)   appliances fitted with air/gas ratio controls.
e)   appliances which incorporate a main burner having more than one section under a common burner control, of which one or more sections may be extinguished whilst another section remains in operation.
This European Standard is applicable to appliances which are intended to be type tested.
NOTE: Requirements for appliances which are not type tested would need to be subject to further consideration.

Gasbefeuerte Warmlufterzeuger ohne Wärmetauscher mit erzwungener Konvektion zum Beheizen von Räumen für den nicht-häuslichen Gebrauch mit einer Nennwärmebelastung nicht über 300 kW

Diese Europäische Norm spezifiziert die Anforderungen an und Prüfverfahren für die Sicherheit und Leistungsfähigkeit direkt gasbefeuerter Warmlufterzeuger für den nichthäuslichen Gebrauch mit erzwungener Konvektion und mit vollautomatischen Regeleinrichtungen (nachfolgend kurz "Geräte" genannt).
Diese Europäische Norm gilt für Geräte der Bauarten A2 und A3, deren Wärmebelastung 300 kW (bezogen auf den Heizwert) nicht übersteigt, ausgerüstet mit eingebauten Brennern und die hauptsächlich für den Gebrauch in aus nur einer Einheit bestehenden Wohnungen bestimmt sind. Sie gilt auch für Geräte, die für eine Aufstellung im Freien vorgesehen sind. Die Abgabe der Warmluft kann bei drinnen aufgestellten Geräten direkt in den zu beheizenden Raum durch Leitungen erfolgen.
Diese Norm gilt nicht für:
a)   Geräte für Wohnungen;
b)   tragbare oder transportable Geräte mit erzwungener Konvektion;
c)   Geräte mit Gasbrennern mit Gebläse;
d)   Geräte mit Gas-Luft-Verbundregelungen;
e)   Geräte mit einem Hauptbrenner mit mehreren Bereichen unter einer gemeinsamen Brennerregelung, wovon einer oder mehrere Bereiche verlöschen dürfen, während ein anderer Bereich in Betrieb bleibt.
Diese Norm ist nur anwendbar für Geräte, die für eine Typprüfung vorgesehen sind.
ANMERKUNG   Anforderungen an Geräte, die nicht für eine Typprüfung vorgesehen sind, benötigen weitere Überlegungen.

Générateurs d'air chaud a chauffage direct et a convection forcée utilisant les combustibles gazeux pour le chauffage de locaux a usage non-domestique, de débit calorifique sur Hi inférieur ou égal a 300 kW

La présente Norme européenne établit les spécifications et les méthodes d'essais relatives à la sécurité des
générateurs d'air chaud à gaz à chauffage direct et à convection forcée pour le chauffage de locaux à usage
non domestique, équipés de systèmes de commande entièrement automatiques, ci-après appelés
« appareils ».
La présente Norme européenne s'applique aux appareils des types A2 et A3 de débit calorifique inférieur ou
égal à 300 kW (sur le pouvoir calorifique inférieur) équipés de brûleurs intégrés destinés à être utilisés dans
des locaux autres que les locaux d'habitation. Elle s’applique également aux appareils destinés à être
installés à l’extérieur. La distribution de l'air chaud peut se faire par des gaines ou directement dans l'espace à
chauffer.
La présente norme ne s'applique pas aux appareils :
a) destinés à être utilisés dans un local d'habitation ;
b) mobiles ou portatifs à convection forcée ;
c) comportant des surpresseurs pour le gaz ;
d) équipés d'un système de régulation du rapport air/gaz ;
e) munis d'un brûleur principal comprenant plusieurs sections sous le contrôle d'un dispositif de commande
commun et dont une ou plusieurs sections peuvent être éteintes tandis qu'une autre section continue à
fonctionner.
La présente Norme européenne s'applique aux appareils devant être soumis à des essais de types.
NOTE Il pourrait être nécessaire de réexaminer les exigences pour les appareils ne subissant pas d'essais de types.

Plinski grelniki zraka s prisilno konvekcijo za gretje nestanovanjskih prostorov z imensko močjo do vključno 300 kW brez prenosnika toplote

General Information

Status
Withdrawn
Public Enquiry End Date
09-Jan-2008
Publication Date
17-Aug-2009
Withdrawal Date
04-Dec-2019
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
04-Dec-2019
Due Date
27-Dec-2019
Completion Date
05-Dec-2019

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SLOVENSKI STANDARD
SIST EN 525:2009
01-september-2009
1DGRPHãþD
SIST EN 525:1999

3OLQVNLJUHOQLNL]UDNDVSULVLOQRNRQYHNFLMR]DJUHWMHQHVWDQRYDQMVNLKSURVWRURY]

LPHQVNRPRþMRGRYNOMXþQRN:EUH]SUHQRVQLNDWRSORWH

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

exceeding a net heat input of 300 kW
Gasbefeuerte Warmlufterzeuger ohne Wärmetauscher mit erzwungener Konvektion zum
Beheizen von Räumen für den nicht-häuslichen Gebrauch mit einer
Nennwärmebelastung nicht über 300 kW
Générateurs d'air chaud a chauffage direct et a convection forcée utilisant les
combustibles gazeux pour le chauffage de locaux a usage non-domestique, de débit
calorifique sur Hi inférieur ou égal a 300 kW
Ta slovenski standard je istoveten z: EN 525:2009
ICS:
97.100.20 Plinski grelniki Gas heaters
SIST EN 525:2009 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 525:2009
---------------------- Page: 2 ----------------------
SIST EN 525:2009
EUROPEAN STANDARD
EN 525
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2009
ICS 97.100.20 Supersedes EN 525:1997
English Version
Non-domestic direct gas-fired forced convection air heaters for
space heating not exceeding a net heat input of 300 kW

Générateurs d'air chaud à chauffage direct et à convection Gasbefeuerte Warmlufterzeuger ohne Wärmetauscher mit

forcée utilisant les combustibles gazeux pour le chauffage erzwungener Konvektion zum Beheizen von Räumen für

de locaux à usage non-domestique, de débit calorifique sur den nicht-häuslichen Gebrauch mit einer

Hi inférieur ou égal à 300 kW Nennwärmebelastung nicht über 300 kW
This European Standard was approved by CEN on 30 April 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 525:2009: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 525:2009
EN 525:2009 (E)
Contents Page

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

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

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

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

3.1 Appliance and its constituent parts .................................................................................................... 6

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

3.3 Appliance operation ........................................................................................................................... 11

3.4 Gases ................................................................................................................................................... 13

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

3.6 Marking of the appliance and packaging ......................................................................................... 15

4 Classification ....................................................................................................................................... 15

4.1 Classification of gases ....................................................................................................................... 15

4.2 Classification of appliance ................................................................................................................ 16

5 Construction and design requirements............................................................................................ 18

5.1 General ................................................................................................................................................. 18

5.2 Adjusting, control and safety devices .............................................................................................. 22

5.3 Ignition devices ................................................................................................................................... 25

5.4 Combustion and dilution air, pre-purge and post-purge ................................................................ 26

5.5 Flame supervision system ................................................................................................................. 27

5.6 Start-gas flame establishment ........................................................................................................... 27

5.7 Main flame establishment .................................................................................................................. 28

5.8 Main burner ......................................................................................................................................... 29

5.9 Facility for remote control ................................................................................................................. 29

5.10 Thermostats and control of air temperature .................................................................................... 30

5.11 Gas pressure points ........................................................................................................................... 30

5.12 Facilities for commissioning and testing ......................................................................................... 30

5.13 Additional requirements for appliances designed for permanent outdoor installation .............. 31

6 Operational requirements .................................................................................................................. 32

6.1 Soundness of the gas circuit ............................................................................................................. 32

6.2 Heat inputs .......................................................................................................................................... 32

6.3 Limiting temperatures ........................................................................................................................ 33

6.4 Ignition, cross-lighting, flame stability ............................................................................................. 33

6.5 Combustion ......................................................................................................................................... 34

6.6 Overheat cut-off device ...................................................................................................................... 34

6.7 Air proving device(s) .......................................................................................................................... 35

6.8 Weather resistance ............................................................................................................................. 35

7 Test methods ....................................................................................................................................... 35

7.1 General ................................................................................................................................................. 35

7.2 Automatic burner control systems (manually operated devices) ................................................. 41

7.3 Safety of operation ............................................................................................................................. 41

8 Marking and instructions ................................................................................................................... 51

8.1 General ................................................................................................................................................. 51

8.2 Description .......................................................................................................................................... 51

8.3 Data plate ............................................................................................................................................. 51

8.4 Other marking ..................................................................................................................................... 52

8.5 Marking on the packaging ................................................................................................................. 53

8.6 Profile plate ......................................................................................................................................... 53

8.7 Instructions ......................................................................................................................................... 53

---------------------- Page: 4 ----------------------
SIST EN 525:2009
EN 525:2009 (E)

Annex A (informative) National situations ...................................................................................................... 56

A.1 General ................................................................................................................................................. 56

A.2 Categories listed in the body of the standard and marketed in different countries ..................... 56

A.3 Appliance supply pressures corresponding to the categories given in A.2 ................................. 59

A.4 Special categories marketed nationally or locally ........................................................................... 59

A.5 Test gases corresponding to the special categories given in A.4 ................................................. 64

A.6 Gas connections in the various countries ........................................................................................ 65

Annex B (normative) Identification of symbols used for marking ............................................................... 67

B.1 Designation of country of destination ............................................................................................... 67

B.2 Category ............................................................................................................................................... 67

B.3 Supplementary transitional information ........................................................................................... 68

Annex C (informative) Guidance for limitations of application of direct-fired air heaters in

buildings ............................................................................................................................................... 70

C.1 Introduction .......................................................................................................................................... 70

C.2 General principles ............................................................................................................................... 70

C.3 Safe operating emission levels .......................................................................................................... 70

C.4 Assessment of concentrations .......................................................................................................... 70

C.5 Case studies ......................................................................................................................................... 71

Annex D (normative) Special national conditions ......................................................................................... 75

D.1 General ................................................................................................................................................. 75

D.2 Belgium ................................................................................................................................................. 75

D.3 Italy ........................................................................................................................................................ 75

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

Members of CEN .................................................................................................................................. 76

E.1 Categories listed in the body of the standard and marketed in different countries ..................... 76

E.2 Appliance supply pressures corresponding to the categories given in E.1 ................................. 76

E.3 Special categories marketed nationally or locally ........................................................................... 76

E.4 Gases and test pressures corresponding to the special categories given in E.3 ........................ 76

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

Requirements of EU Directive 90/396/EEC (Gas Appliance Directive)........................................... 77

Bibliography ...................................................................................................................................................... 79

---------------------- Page: 5 ----------------------
SIST EN 525:2009
EN 525:2009 (E)
Foreword

This document (EN 525:2009) has been prepared by Technical Committee CEN/TC 180 “Domestic 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 November 2009, and conflicting national standards shall be withdrawn

at the latest by November 2009.

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 525:1997.

The test gases, test pressures and appliance categories given in this European Standard are in accordance

with those specified in EN 437:2003.
Other European Standards covering gas-fired air heaters are:

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 778 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

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

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 EC Directive 90/396/EEC.

For relationship with EC Directive 90/396/EEC, see informative Annex ZA, which is an integral part of this

document.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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 525:2009
EN 525:2009 (E)
1 Scope

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

gas-fired forced convection air heaters having fully automatic control systems, hereafter referred to as

"appliances".

This European Standard applies to appliances of Type A and Type A with heat input based on the net

2 3

calorific value of 300 kW or less fitted with integral burners intended for use other than in residential dwellings.

It also applies to appliances designed for outdoor installation. For indoor appliances 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 residential dwellings;
b) portable or transportable forced convection appliances;
c) appliances fitted with gas boosters;
d) appliances fitted with air/gas ratio controls;

e) appliances which incorporate a main burner having more than one section under a common burner

control, of which one or more sections may be extinguished whilst another section remains in operation.

This European Standard is applicable to appliances which are intended to be type tested.

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 88-1:2007, Pressure regulators and associated safety devices for gas appliances - Part 1: Pressure

regulators for inlet pressures up to and including 500 mbar
EN 126:2004, Multifuctional controls for gas burning appliances

EN 161:2007, Automatic shut-off valves for gas burners and gas-burning appliances

EN 257:1992, Mechanical thermostats for gas burning appliances

EN 298:2003, Automatic burner control systems for gas burners and gas burning appliances with or without

fans
EN 437:2003, Test gases - Test pressures - Appliance categories

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, Safety of household and similar electrical appliances - Part 1: General requirements

---------------------- Page: 7 ----------------------
SIST EN 525:2009
EN 525:2009 (E)

EN 60335-2-102:2006, Electrical equipment of non-electric heating appliances for household and similar

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

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

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

requirements for electrical controls for electrical household appliances

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

requirements for temperature-sensing controls
EN 61058-1:2002, Switches for appliances - Part 1: General requirements

EN 61558-2-6:1997, Safety of power transformers, power supply units and similar – Part 2-6:. Particular

requirements for safety isolating transformers for general use

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)

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 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
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/or ventilation of a building other than a 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
direct fired forced convection air heater

forced convection air heater in which the products of combustion mix with the heated air being supplied to the

space
3,1,4
high temperature direct fired forced convection air heater
---------------------- Page: 8 ----------------------
SIST EN 525:2009
EN 525:2009 (E)

direct fired forced convection air heater designed to operate with an air temperature rise through the appliance

greater than 60 K
3.1.5
low temperature direct fired forced convection air heater

direct fired forced convection air heater designed to operate with a maximum air temperature rise through the

appliance of 60 K or less
3.1.6
appliance with facility for downstream re-circulation of air

appliance in which a proportion of the heated air can be returned to the appliance at a point down stream of

the burner and re-distributed
3.1.7
appliance with facility for upstream re-circulation of air

appliance in which a proportion of the heated air can be returned to the appliance at a point upstream of the

burner and re-distributed.
3.1.8
profile plates

fixed or adjustable plates fitted for the purpose of setting the air flow velocity across the burner

3.1.9
gas inlet connection
part of the appliance intended to be connected to the gas supply
3.1.10
combustion chamber
part of the appliance in which the principal combustion process takes place
3.1.11
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); or flat joints.

3.1.12
gas circuit

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

burner(s)
3.1.13
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

3.1.14
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.”
---------------------- Page: 9 ----------------------
SIST EN 525:2009
EN 525:2009 (E)
NOTE 4 A factory sealed gas rate adjuster is considered to be non-existent.
3.1.15
setting an adjuster

immobilizing a gas rate adjuster (by some means such as e.g. a screw) after the gas rate has been adjusted by

the manufacturer or installer
3.1.16
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.

3.1.17
putting an adjuster or a control out of service

adjuster or a control (e.g. of temperature or pressure) is said to be “put out of service” if it is put out of action and

sealed in this position
NOTE The burner unit then functions as if this device has been removed.
3.1.18
injector
component that admits the gas into a burner
3.1.19
main burner

burner that is intended to assure the thermal function of the appliance and is generally called the burner

3.1.20
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
3.1.21
ignition burner
burner whose flame is intended to ignite another burner
3.1.22
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".
3.1.23
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).
---------------------- Page: 10 ----------------------
SIST EN 525:2009
EN 525:2009 (E)
3.2 Adjustment, control and safety devices
3.2.1
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].

3.2.2
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].
3.2.3
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].

3.2.4
flame supervision

device that, in response to a signal from the flame detector, keeps the gas supply open and shuts it off in the

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

NOTE It 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]
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
volume regulator

device which maintains the gas rate constant within a given tolerance, independent of the upstream pressure

---------------------- Page: 11 ----------------------
SIST EN 525:2009
EN 525:2009 (E)
3.2.11
automatic shut-off valve

valve designed to open when energized and to close automatically when de-energized

3.2.12
control thermostat

device controlling the operation of the appliance (by on/off, high/low or modulating control) and enabling the

temperature to be kept automatically, within a given tolerance, at a predetermined value

3.2.13
overheat cut-off device

device that shuts off and locks out the gas supply before the appliance is damaged and/or before safety is

compromi
...

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