EN 525:2009

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 legt die Anforderungen an und Prüfverfahren für die Sicherheit und Leistungsfähigkeit direkt gasbefeuerter Warmlufterzeuger für den nicht häuslichen Gebrauch mit erzwungener Konvektion und mit vollautomatischen Regeleinrichtungen (nachfolgend kurz "Geräte" genannt) fest.
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 nicht für die Verwendung in 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 à chauffage direct et à convection forcée utilisant les combustibles gazeux pour le chauffage de locaux à usage non-domestique, de débit calorifique sur Hi inférieur ou égal à 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
• Publication Date: 26-May-2009
• Withdrawal Date: 13-Apr-2025
• ICS: 97.100.20 - Gas heaters
• Technical Committee: CEN/TC 180 - Non-domestic gas-fired overhead radiant heaters
• Drafting Committee: CEN/TC 180/WG 2 - Gas-fired overhead radiant heaters - Ventilation requirements for non-domestic premises
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 16-Oct-2019
• Completion Date: 14-Apr-2025
• Directive: 2009/142/EC - DIRECTIVE 2009/142/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 30 November 2009 relating to appliances burning gaseous fuels
• Directive: 89/106/EEC - Construction products
• Directive: 90/396/EEC - Appliances burning gaseous fuels
• Mandate: M/105 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on chimneys, flues and specific products
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: SIST EN 525:2009 - Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW

Relations

• Replaces: EN 525:1997 - Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW
• Effective Date: 22-Dec-2008
• Replaced By: EN 17082:2019 - Domestic and non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW
• Effective Date: 23-Oct-2019

Standards Content (Sample)

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

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.

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
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

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.
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
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
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.”
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).
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

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
compromised and which requires manual intervention to restore the gas supply
NOTE This device is preset and sealed by the appliance manufacturer.
3.2.14
temperature sensing element; temperature sensor
component that detects the temperature of the environment to be supervised or controlled
3.2.15
modulating control
automatic control by which the heat input of the appliance can be varied in a continuous manner between the
nominal heat input and a minimum value
3.2.16
high/low control
automatic control which permits an appliance to operate either at the nominal heat input or at a fixed reduced
heat input.
3.2.17
vent valve
normally open automatic valve fitted between two automatic shut-off valves and intended to vent any small
leakages of gas
3.2.18
air flow proving device
device which monitors and proves the existence of an adequate flow of air for combustion and, where
appropriate, for dilution
3.2.19
proof of closure indicator
device fitted to a Class A, B or C automatic shut-off valve with mechanical overtravel which proves the valve to
be in the closed position
3.2.20
closed position indicator
device fitted to a Class A, B or C automatic shut-off valve which indicates when the valve is in the nominally
closed position
3.2.21
valve proving system
system to check the effective closure of the start gas or main gas safety shut-off valves, and which is capable
of detecting small gas leakage rates (e.g. by means of a pressure or vacuum proving system)
3.3 Appliance operation
3.3.1
volume flow rate
V
volume of gas consumed by the appliance in unit time during continuous operation
NOTE The volume flow rate is expressed in cubic metres per hour (m /h), litres per minute (l/min), cubic decimetres
3 3
per hour (dm /h) or cubic decimetres per second (dm /s) [EN 437:2003]
3.3.2
mass flow rate
M
mass of gas consumed by the appliance in unit time during continuous operation
NOTE The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h) [EN 437:2003]
3.3.3
heat input
Q
quantity of energy used in unit time corresponding to the volumetric or mass flow rates: the calorific value
used being the net or gross calorific value
NOTE the heat input is expressed in kilowatts (kW) [EN 437:2003]
3.3.4
nominal heat input
Q
n
value of the heat input (kW) declared by the manufacturer
3.3.5
flame stability
characteristic of flames which remain on the burner ports or in the flame reception zone intended by the
construction
3.3.6
flame lift
total or partial lifting of the base of the flame away from the burner port or the flame reception zone provided
by the design
NOTE Flame lift may cause the flame to blow out (i.e. extinction of the air-gas mixture).
3.3.7
light-back
entry of a flame into the body of the burner
3.3.8
light-back at the injector
ignition of the gas at the injector, either as a result of light-back into the burner or by the propagation of a
flame outside the burner
3.3.9
sooting
phenomenon appearing during incomplete combustion and characterized by deposits of soot on the surfaces
or parts in contact with the combustion products or with the flame
3.3.10
yellow tipping
yellowing of the tip of the blue cone of an aerated flame
3.3.11
first safety time
interval between the ignition burner gas valve, the start gas valve or main gas valve, as applicable, being
energized and the ignition burner gas valve, start gas valve or main gas valve, as applicable, being de-
energized if the flame detector signals the absence of a flame at the end of this interval
NOTE Where there is no second safety time, this is called the safety time.
3.3.12
second safety time
where there is a first safety time to either a ignition burner or start gas flame only, the interval between the
main gas valve being energized and the main gas valve being de-energized if the flame detector signals the
absence of a flame
3.3.13
start gas
gas that is supplied at the start gas rate to establish the start gas flame
3.3.14
start gas rate
restricted gas flow rate admitted either to a separate ignition burner or to the main burner during the first safety
time
3.3.15
start gas flame
flame established at the start gas rate either at the main burner or at a separate ignition burner
3.3.16
start gas flame proving period
interval between the end of the first safety time and the beginning of the second safety time which is used to
prove that the start gas flame is stable
3.3.17
running condition
condition of the system in which the burner is in normal operation under the supervision of the programming
unit and its flame detector device
3.3.18
controlled shut-down
process by which the power to the gas shut-off valve(s) is removed immediately, e.g. as a result of the action
of a controlling function [EN 298:2003]
3.3.19
safety shut-down
process which is effected immediately following the response of a protection device or a fault in the automatic
burner control system and puts the burner out of operation
NOTE The resulting state of the system is defined by deactivatioed terminals for the gas shut-off valves and the ignition
device [EN 298:2003].
3.3.20
Lock-out
3.3.20.1
non-volatile lock-out
safety shut-down condition of the system, such that a restart can only be accomplished by a manual reset of
the system and by no other means [EN 298:2003]
3.3.20.2
volatile lock-out
safety shut-down condition of the system, such that a restart can only be accomplished by either the manual
reset of the system or an interruption of the electrical supply and its subsequent restoration [EN 298:2003]
3.3.21
spark restoration
process by which, after disappearance of the flame signal, the ignition device is energized again without the
gas supply having been totally interrupted
NOTE This process ends with the restoration of the running condition or, if there is no flame signal at the end of the
safety time, with non-volatile lock-out.
3.3.22
automatic recycling
process by which, after loss of flame during the running condition or accidental interruption of the operation of
the appliance, the gas supply is interrupted and the complete start sequence is automatically re-initiated
NOTE This process ends with the restoration of the running condition or, if there is no flame signal at the end of the
safety time or, if the cause of the accidental interruption has not been removed, with non-volatile lock-out.
3.3.23
extinction safety time
time interval between extinction of the supervised flame and the gas supply to the main burner and/or to the
ignition burner being shut off
3.3.24
no-air condition
condition of the air proving device in which the device is checked for correct operation at zero air flow
3.3.25
proved air flow
minimum air flow at which the air proving device indicates the presence of air flow
3.3.26
safe-start check
check provided by a protective circuit on start up leading to safety shut-down or non-volatile lockout if a fault
condition is present
3.4 Gases
3.4.1
test gases
gases intended for the verification of the operational characteristics of appliances using combustible gases.
They comprise the reference and the limit gases [EN 437:2003]
3.4.2
reference gases
test gases with which appliances operate under nominal conditions when they are supplied at the
corresponding normal pressure [EN 437:2003]
3.4.3
limit gases
test gases representative of the extreme variations in the characteristics of the gases for which appliances
have been designed [EN 437:2003]
3.4.4
gas pressure
static pressure, relative to the atmospheric pressure, measured at right angles to the direction of flow of the
gas
NOTE Test pressures are expressed in mbar or bar.
3.4.5
test pressure
gas pressures used to verify the operational characteristics of appliances using combustible gases. They
consist of normal and limit pressures
NOTE Test pressures are expressed in mbar (1 mbar = 10 Pa) [EN 437:2003]
3.4.6
normal pressure
p
n
pressure under which the appliances operate in nominal conditions when they are supplied with the
corresponding reference gas [EN 437:2003]
3.4.7
limit pressure
(maximum limit pressure p and minimum limit pressure p )
max min
NOTE Pressures representative of the extreme variations in the appliance supply conditions [EN 437:2003].
3.4.8
pressure couple
combination of two distinct gas distribution pressures applied by reason of the significant difference existing
between the Wobbe indices within a single family or group in which the higher pressure corresponds only to
gases of low Wobbe index, and the lower pressure corresponds to gases of high Wobbe index [EN 437:2003]
3.4.9
relative density
d
ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature and
pressure.
3.4.10
calorific value
quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of a
unit volume or mass of gas, the constituents of the combustible mixture being taken at reference conditions
and the products of combustion being brought back to the same conditions
NOTE 1 A distinction is made between the gross calorific value H in which the water produced by combustion is
s
assumed to be condensed, and the net calorific value H in which the water produced by combustion is assumed to be in
i
the vapour state.
NOTE 2 The calorific value is expressed either in MJ/m of dry gas at the reference conditions or in MJ/kg of dry gas
[EN 437:2003].
3.4.11
Wobbe index (gross Wobbe index: Ws; net Wobbe index: Wi)
ratio of the calorific value of a gas per unit volume and the square root of its relative density under the same
reference conditions.
NOTE 1 The Wobbe index is said to be gross or net according to whether the calorific value used is the gross or net
calorific value.
NOTE 2 The Wobbe index is expressed either in MJ/m of dry gas at the reference conditions or in MJ/kg of dry gas
[EN 437:2003].
3.5 Conditions of operation and measurement
3.5.1 Reference conditions
3.5.1.1 For calorific values, temperature 15 °C
3.5.1.2 For gas and air volumes dry, brought to 15 °C and to an absolute pressure of 1 013,25 mbar
3.5.2
cold condition
condition of the appliance required for some tests and obtained by allowing the unlit appliance to attain
thermal equilibrium at room temperature
3.5.3
hot condition
condition of the appliance required for some tests and obtained by heating to thermal equilibrium at the
nominal heat input specified by the manufacturer, any thermostat remaining fully open
3.5.4
equivalent resistance
resistance to flow (in mbar) measured at the outlet of the appliance, which is equivalent to that of the actual
flue
3.6 Marking of the appliance and packaging
3.6.1
direct country of destination
country for which the appliance has been certified and which is specified by the manufacturer as the intended
country of destination
NOTE 1 At the time of putting the appliance on the market and/or of installation, the appliance needs to be capable of
operating, without adjustment or modification, with one of the gases distributed in the country concerned, at the
appropriate supply pressure.
NOTE 2 More than one country can be specified if the appliance, in its current state of adjustment, can be used in
each of these countries.
3.6.2
indirect country of destination
country for which the appliance has been certified, but for which, in its present state of adjustment, it is not
suitable
NOTE Subsequent modification or adjustment is essential in order that it can be utilized safely and correctly in this
country.
4 Classification
4.1 Classification of gases
Gases are classified into three families, possibly divided into groups according to the value of the Wobbe
index. Table 1 specifies the families and groups of gas used in this standard.
Table 1 — Classification of gasses
Gas family Gas Group Gross Wobbe index
(MJ/m ) at 15 °C and
1 013, 25 mbar
Minimum Maximum
First a 22,4 24,8
Second 39,1 54,7
H 45,7 54,7
L 39,1 44,8
E 40,9 54,7
Third 72,9 87,3
B/P 72,9 87,3
P 72,9 76,8
B 81,8 87,3
4.2 Classification of appliance
4.2.1 Classification according to the gases capable of being used
Appliances of Category I are designed exclusively for the use of gases of a single family or of a single group.
a) Appliances designed for use on first family gases only
1) Category I : Appliances using only gases of Group a of the first family at the prescribed pressure
1a
(this category is not used).
b) Appliances designed for use on second family gases only
1) Category I : Appliances using only gases of Group H of the second family at the prescribed supply
2H
pressures.
2) Category I : Appliances using only gases of Group L of the second family at the prescribed
2L
pressures.
3) Category I : Appliances using only gases of Group E of the second family at the prescribed
2E
pressures.
4) Category I : Appliances using only gases of Group E of the second family, and operating with a
2+
pressure couple without adjustment on the system. The appliance gas regulator, if it exists, is not
operative in the range of the two normal pressures of the pressure couple.
4.2.1.1.1 Appliances designed for use on 3rd family gases only
a) Category I : Appliances capable of using the third family gases (propane and butane) at the prescribed
3B/P
supply pressure.
b) Category I : Appliances capable of using the third family (propane and butane) and operating with a
3+
pressure couple without adjustment of the appliance other than a possible adjustment of the primary air in
order to change from butane to propane and vice versa. No operational pressure regulating device is
permitted on the appliance.
c) Category I : Appliances using only gases of Group P of the third family (propane) at the prescribed
3P
supply pressure.
4.2.1.2 Category II
Appliances of Category II are designed for use on gases of two families.
4.2.1.2.1 Appliances designed for use on gases of the first and second families
Category II : Appliances capable of using gases of Group a of the first
...