SIST EN 267:2020

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 267:2010+A1:2012
Ventilatorski gorilniki za tekoča goriva
Forced draught burners for liquid fuels
Gebläsebrenner für flüssige Brennstoffe
Brûleurs automatiques à air soufflé pour combustibles liquides
Ta slovenski standard je istoveten z: EN 267:2020
ICS:
27.060.10 Gorilniki na tekoče in trdo Liquid and solid fuel burners
gorivo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 267
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2020
EUROPÄISCHE NORM
ICS 27.060.10 Supersedes EN 267:2009+A1:2011
English Version
Forced draught burners for liquid fuels
Brûleurs à air soufflé pour combustibles liquides Gebläsebrenner für flüssige Brennstoffe
This European Standard was approved by CEN on 8 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 267:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 12
3.1 General definitions . 12
3.2 Fuel flow rate and heat input . 13
3.3 Combustion chamber, burner head and test rig . 14
3.4 Composition of the gaseous combustion products . 15
3.5 Adjusting, control and safety devices . 16
3.6 Sequencing . 17
3.7 Diagrams . 20
4 Classification, constructional and operational requirements – safety requirements
and/or protective measures . 21
4.1 Types of atomization . 21
4.2 Methods of control of automatic or semi-automatic oil burners . 21
4.3 Means of ignition . 21
4.4 Construction . 22
4.5 Equipment . 24
4.6 Functional and operational requirements . 30
4.7 Working diagram and test diagram . 34
4.8 Combustion products quality . 36
4.9 Machine safety requirements and/or protective measures . 39
5 Testing . 39
5.1 General . 39
5.2 Test room . 40
5.3 Test rig . 40
5.4 Measuring equipment . 44
5.5 Measuring accuracy . 45
5.6 Test conditions . 46
5.7 Test programme . 47
5.8 Replacement of individual parts and equivalent components . 56
6 Marking and labelling . 56
6.1 General . 56
6.2 Data plate . 56
6.3 Other marking . 56
6.4 Instructions for installation, adjustment, maintenance and operation . 57
6.5 Packaging . 58
Annex A (normative) Smoke number . 59
Annex B (normative) Determination of combustion characteristics — Carbon monoxide
and nitrogen oxides, conversion and corrections . 61
Annex C (informative) Void . 65
Annex D (normative) FID measuring method for recording the unburned hydrocarbons . 66
Annex E (informative) Conformity evaluation . 67
Annex F (informative) Examples for equipping of burners . 70
Annex G (informative) Other fuels . 74
Annex H (informative) Specific additional requirements and limitations for use of EN 267
burners for industrial applications. 75
Annex I (informative) Check of the air proving device . 76
Annex J (normative) Machine related hazards - additional safety requirements and/or
protective measures . 77
Annex K (normative) Additional requirements for burners with pressurized parts and
burners firing pressurized bodies as defined in the Pressure Equipment Directive
(PED) 2014/68/EU . 82
Annex L (normative) Electrical requirements – modifications to EN 60204-1 . 90
Annex M (normative) Equipment to increase the efficiency of the burner - boiler
installation . 105
Annex N (informative) Electrical interfaces for burners. 106
Annex O (informative) Environmental checklist EN 267 . 111
Annex P (informative) Guide for the applicability of the different standards on electrical
safety . 113
Annex Q (informative) Verification procedures for market surveillance purposes (ErP) . 115
Annex ZA (informative) Relationship between this European Standard and the ecodesign
requirements of Commission Regulation (EU) No 813/2013 aimed to be covered . 116
Bibliography . 117

European foreword
This document (EN 267:2020) has been prepared by Technical Committee CEN/TC 47 “Atomizing oil
burners and their components - Function - Safety - Testing”, the secretariat of which is held by DIN.
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 January 2023.
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 EN 267:2009+A1:2011.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directives.
For relationship with EU Directives, see informative Annex ZA, which are integral parts of this
document.
Compared to EN 267:2009+A1:2011 the following fundamental changes have been made:
— based on ISO 22968 where different to EN 267:2009+A1:2011 such as:
— flow rate from 100 kg/h to 30 kg/h requires a second valve, where the 30 kg/h are replaced by
400 kW;
— update of definitions;
— electrical interfaces for burners;
— modification:
— test and working diagram NO emission calculation;
X
— replacement of EN 50156-1:2004 by EN 60204-1 to include international available
requirements for the electrical safety of machines; see Annex L with editorial allocation in
Annex K;
— Annex J is adapted to the new ISO EN 12100 which is substituting EN 1050 which is currently
referenced to in Table J.1;
— mass flow rate is changed into heat input;
— new functions / requirements:
— remote reset;
— environmental aspects (environmental check list);
— increase of burner efficiency;
— terminology for burner load control;
— NO mean value for evaluating the NO classes;
X X
— implementing new requirements to comply with the 2013/813 (ErP);
— requiring of a risk assessment as required by EU directive 2014/35/EU for LVD and EU
Directive 2014/30/EU for EMC.
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,
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 the
United Kingdom.
Introduction
This document is primarily intended for forced draught oil burners having a combustion air fan,
operated with liquid fuels, and intended to be marketed as a complete assembly.
Forced draught oil burners according to this document are also used in industrial applications. The
safety principles are the same as for forced draught oil burners used for household/commercial
applications. Industrial forced draught oil burners however need to operate safely in their industrial
environment and the risks involved can differ from those for household applications. These industrial
forced draught oil burners can be characterized by the ability to withstand industrial environmental
influences, like moisture, high temperature, electrical and magnetic phenomena, vibrations, etc.
Special requirements for forced draught burners for industrial premises are given in the form of notes
and identified by “industrial application”.
Further information and application limitations for forced draught burners, which are used for
industrial application, are given in informative Annex H.
Principal requirements for installation of oil burners for industrial thermal processing are covered by
EN 746-2.
This document is a type C standard as stated in EN ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and hazardous events
are covered are indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B
standards, the provisions of this type C standard take precedence over the provisions of the other
standard, for machines that have been designed and built according to the provisions of this type C
standard.
1 Scope
This document specifies the terminology, the general requirements for the construction and operation
of forced draught oil burners and also the provision of control and safety devices, and the test
procedure for these burners.
This document applies to forced draught oil burners supplied with:
— fuel based on first raffinates and their mixtures with biogenous liquid fuels having a viscosity at the
2 2
burner inlet of 1,6 mm /s (cSt) up to 6 mm /s (cSt) at 20 °C, and
— higher boiling petroleum based first raffinates (viscosity greater than 6 mm /s), that require
preheating for proper atomization.
This document is applicable to:
— single burners fitted to a single combustion chamber;
— single burners fitted to an appliance with additional requirements;
NOTE When additional requirements which are not identified or specified in this standard apply, the
specification of the required safety measures and/or protective devices and compliance with them is outside the
scope of this standard.
— single-fuel and dual-fuel burners when operating on oil only;
— the oil function of dual-fuel burners designed to operate simultaneously on liquid and gaseous
fuels, which, for the latter, the requirements of EN 676 also apply.
This document deals with all significant machine hazards, hazardous situations and events relevant to
burners, when they are used as intended and under conditions of misuse which are reasonably
foreseeable, see Annex J.
This document also deals with the additional requirements for the burners in the scope with
pressurized parts and/or firing pressurized bodies, see Annex K.
This document specifies the requirements to ensure the safety during commissioning, start-up,
operation, shut-down and maintenance.
This document deals also with forced draught burners intended to be used with biogenous liquid fuels,
mixtures.
This document deals also with burners and their equipment to increase the total appliance efficiency,
see Annex M.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 298:2012, Automatic burner control systems for burners and appliances burning gaseous or liquid
fuels
EN 676:2017, Forced draught burners for gaseous fuels
EN 1057:2006+A1:2010, Copper and copper alloys — Seamless, round copper tubes for water and gas in
sanitary and heating applications
EN 1092-1:2007+A1:2013, Flanges and their joints — Circular flanges for pipes, valves, fittings and
accessories, PN designated — Part 1: Steel flanges
EN 1092-2:1997, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 2: Cast iron flanges
EN 1092-3:2003, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 3: Copper alloy flanges
EN 1254-1, Copper and copper alloys — Plumbing fittings — Part 1: Fittings with ends for capillary
soldering or capillary brazing to copper tubes
EN 1254-4:1998, Copper and copper alloys — Plumbing fittings — Part 4: Fittings combining other end
connections with capillary or compression ends
EN 1854:2010, Pressure sensing devices for gas burners and gas burning appliances
EN 10204:2004, Metallic products — Types of inspection documents
EN 10220:2002, Seamless and welded steel tubes — Dimensions and masses per unit length
EN 10305-1:2016, Steel tubes for precision applications — Technical delivery conditions — Part 1:
Seamless cold drawn tubes
EN 10305-2:2016, Steel tubes for precision applications — Technical delivery conditions — Part 2:
Welded cold drawn tubes
EN 10305-3:2016, Steel tubes for precision applications — Technical delivery conditions — Part 3:
Welded cold sized tubes
EN 10305-4:2016, Steel tubes for precision applications — Technical delivery conditions — Part 4:
Seamless cold drawn tubes for hydraulic and pneumatic power systems
EN 10305-5:2016, Steel tubes for precision applications — Technical delivery conditions — Part 5:
Welded cold sized square and rectangular tubes
EN 10305-6:2016, Steel tubes for precision applications — Technical delivery conditions — Part 6:
Welded cold drawn tubes for hydraulic and pneumatic power systems
EN 13611:2015, Safety and control devices for burners and appliances burning gaseous and/or liquid
fuels — General requirements
EN 15035:2006, Heating boilers — Special requirements for oil fired room sealed units up to 70 kW
EN 15036-1:2006, Heating boilers — Test regulations for airborne noise emissions from heat generators
— Part 1: Airborne noise emissions from heat generators
EN 15456:2008, Heating boilers — Electrical power consumption for heat generators — System
boundaries - Measurements
EN 50156-1:2015, Electrical equipment for furnaces and ancillary equipment — Part 1: Requirements for
application design and installation
EN 50205:2002, Relays with forcibly guided (mechanically linked) contacts
EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements (IEC 60204-1:2005)
EN 60335-2-102:2016, Household and similar electrical appliances — Safety — Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections (IEC 60335-2-
102:2004)
HD 60364-4-41:2007, Low-voltage electrical installations — Part 4-41: Protection for safety —
Protection against electric shock (IEC 60364-4-41:2005)
EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN 60664-1:2007, Insulation coordination for equipment within low-voltage systems — Part 1: Principles,
requirements and tests (IEC 60664-1:2007)
EN 60721-3-1:1997, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 1: Storage (IEC 60721-3-1:1997)
EN 60721-3-2:1997, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 2: Transportation (IEC 60721-3-2:1997)
EN 60721-3-3:1995, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 3: Stationary use at weatherprotected locations
(IEC 60721-3-3:1994)
EN 60730-1:2011, Automatic electrical controls for household and similar use — Part 1: General
requirements (IEC 60730-1:2010, modified)
EN 60730-2-5:2015, Automatic electrical controls — Part 2-5: Particular requirements for automatic
electrical burner control systems (IEC 60730-2-5:2013)
EN 60947-4-1:2010, Low-voltage switchgear and controlgear — Part 4-1: Contactors and motor-starters
— Electromechanical contactors and motor-starters (IEC 60947-4-1:2009)
EN 60947-2:2016, Low-voltage switchgear and controlgear — Part 2: Circuit-breakers (IEC
60947-2:2016)
EN 61000-4, Electromagnetic compatibility (EMC) — Testing and measurement techniques
EN 61000-4-13:2002, Electromagnetic compatibility (EMC) — Part 4-13: Testing and measurement
techniques — Harmonics and interharmonics including mains signalling at a.c. power port, low frequency
immunity tests (IEC 61000-4-13:2002)
EN 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for
visual, acoustic and tactile signals (IEC 61310-1:2007)
EN 61558-2-3:2010, Safety of transformers, reactors, power supply units and combinations thereof —
Part 2-3: Particular requirements and tests for ignition transformers for gas and oil burners (IEC 61558-2-
3:2010)
EN 61558-2-6:2009, Safety of transformers, reactors, power supply units and similar products for supply
voltages up to 1 100 V — Part 2-6: Particular requirements and tests for safety isolating transformers and
power supply units incorporating safety isolating transformers (IEC 61558-2-6:2009)
EN 61810-1:2015, Electromechanical elementary relays — Part 1: General and safety requirements (IEC
61810-1:2015)
EN 62061:2005, Safety of machinery — Functional safety of safety-related electrical, electronic and
programmable electronic control systems (IEC 62061:2005)
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 1127:1996, Stainless steel tubes — Dimensions, tolerances and conventional masses per unit
length (ISO 1127:1992)
EN ISO 3183:2012, Petroleum and natural gas industries — Steel pipe for pipeline transportation systems
(ISO 3183:2012)
EN ISO 4871:2009, Acoustics — Declaration and verification of noise emission values of machinery and
equipment (ISO 4871:1996)
EN ISO 6806:2014, Rubber hoses and hose assemblies for use in oil burners — Specification (ISO
6806:2014)
EN ISO 9606-1:2013, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012)
EN ISO 9606-2:2004, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium
alloys (ISO 9606-2:2004)
EN ISO 9606-3:1999, Approval testing of welders — Fusion welding — Part 3: Copper and copper alloys
(ISO 9606-3:1999)
EN ISO 9606-4:1999, Approval testing of welders — Fusion welding — Part 4: Nickel and nickel alloys
(ISO 9606-4:1999)
EN ISO 9606-5:2000, Approval testing of welders — Fusion welding — Part 5: Titanium and titanium
alloys, zirconium and zirconium alloys (ISO 9606-5:2000)
EN ISO 11688-1:2009, Acoustics — Recommended practice for the design of low-noise machinery and
equipment — Part 1: Planning (ISO/TR 11688-1:1995)
EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk
reduction (ISO 12100:2010)
EN ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2015)
EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2008)
EN ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection (ISO 14119:2013)
EN ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and
construction of fixed and movable guards (ISO 14120:2015)
EN ISO 15609-1:2004, Specification and qualification of welding procedures for metallic materials —
Welding procedure specification — Part 1: Arc welding (ISO 15609-1:2004)
EN ISO 15609-2:2001, Specification and qualification of welding procedures for metallic materials —
Welding procedure specification — Part 2: Gas welding (ISO 15609-2:2001)
EN ISO 15609-3:2004, Specification and qualification of welding procedures for metallic materials —
Welding procedures specification — Part 3: Electron beam welding (ISO 15609-3:2004)
EN ISO 15609-4:2009, Specification and qualification of welding procedures for metallic materials —
Welding procedure specification — Part 4: Laser beam welding (ISO 15609-4:2009)
EN ISO 15609-5:2011, Specification and qualification of welding procedures for metallic materials —
Welding procedure specification — Part 5: Resistance welding (ISO 15609-5:2011, Corrected version 2011-
12-01)
EN ISO 15612:2004, Specification and qualification of welding procedures for metallic materials —
Qualification by adoption of a standard welding procedure (ISO 15612:2004)
EN ISO 15614-7:2016, Specification and qualification of welding procedures for metallic materials —
Welding procedure test — Part 7: Overlay welding (ISO 15614-7:2016)
EN ISO 15614-11:2002, Specification and qualification of welding procedures for metallic materials —
Welding procedure test — Part 11: Electron and laser beam welding (ISO 15614-11:2002)
EN ISO 17672:2016, Brazing — Filler metals (ISO 17672:2016)
EN ISO 23553-1:2014, Safety and control devices for oil burners and oil-burning appliances — Particular
requirements — Part 1: Automatic and semi-automatic valves (ISO 23553-1:2014)
ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions,
tolerances and designation
ISO 1129:1980, Steel tubes for boilers, superheaters and heat exchangers — Dimensions, tolerances and
conventional masses per unit length
ISO 8217:2017, Petroleum products — Fuels (class F) — Specifications of marine fuels
ISO 9329-1:1989, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1:
Unalloyed steels with specified room temperature properties
ISO 9330-1:1990, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1:
Unalloyed steel tubes with specified room temperature properties
ISO 9330-2:1997, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 2:
Electric resistance and induction welded unalloyed and alloyed steel tubes with specified elevated
temperature properties
ISO 9330-3:1997, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 3:
Electric resistance and induction welded unalloyed and alloyed steel tubes with specified low temperature
properties
ISO 9330-4:2000, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 4:
Submerged arc-welded unalloyed and alloyed steel tubes with specified elevated temperature properties
ISO 9330-5:2000, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5:
Submerged arc-welded unalloyed and alloyed steel tubes with specified low temperature properties
ISO 9330-6:1997, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 6:
Longitudinally welded austenitic stainless steel tubes
ISO 23552-1:2007, Safety and control devices for gas and/or oil burners and gas and/or oil appliances —
Particular requirements — Part 1: Fuel/air ratio controls, electronic type
3 Terms and definitions
For the purposes of this document the terms and definitions given in EN ISO 12100:2010 and the
following apply.
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 http://www.iso.org/obp
3.1 General definitions
3.1.1
forced draught burner
burner in which the total air for combustion is supplied by means of a fan
3.1.2
automatic forced draught burner
forced draught burner that is fitted with an ignition, and automatic burner control system where the
ignition, flame monitoring and the on/off switching of the burner occurs automatically
Note 1 to entry: The heat input of the burner can be adjusted during operation either automatically or
manually.
3.1.3
semi-automatic oil burner
burner that differs from the fully automatic burner only in that start-up of the burner is initiated
manually by the operating personnel and there is no automatic recycling after switching off the burner
3.1.4
dual-fuel burner
burner in which both gaseous and liquid fuels can be burnt either simultaneously or in succession
3.1.5
industrial application
forced draught burner utilization and operation in industrial environment
EXAMPLE industrial application in:
― the extraction,
― growth,
― refining,
― processing,
― production,
― manufacture, or
― preparation of materials, plants, livestock, animal products, food or artefacts.
3.2 Fuel flow rate and heat input
3.2.1
fuel flow rate
constant volume or mass of fuel consumed during a period of time
Note 1 to entry: Fuel flow rate is expressed in kilograms per hour (kg/h) as mass flow rate.
Note 2 to entry: Fuel flow rate is expressed in litre per hour (l/h) as volume flow rate.
3.2.1.1
maximum fuel flow rate
mass or volume of fuel consumed during a period of time at maximum heat input
3.2.1.2
minimum fuel flow rate
mass or volume of fuel consumed during a period of time at minimum heat input
3.2.2
heat input
Q
F
quantity of energy used in unit time corresponding to the volume or mass flow rates, the calorific value
used being either the net or gross calorific value
Note 1 to entry: Heat input is expressed in kilowatts (kW) and is calculated as fuel flow rate multiplied with the
net calorific value.
3.2.2.1
maximum heat input
Q
Fmax
highest value of the heat input given in the instructions
Note 1 to entry: Maximum heat input is expressed in kilowatts (kW).
3.2.2.2
minimum heat input
Q
Fmin
lowest value of the heat input given in the instructions
Note 1 to entry: Minimum heat input is expressed in kilowatts (kW).
3.2.2.3
start heat input
Q
s
input of the burner during start-up position as a ratio of the maximum heat input
Note 1 to entry: Start heat input is expressed in percent (%).
3.2.2.4
nominal heat input
Q
FN
value of the heat input given in the instructions
Note 1 to entry: Fixed heat input burners have a single nominal heat input.
Note 2 to entry: Range-rated burners can be adjusted between the maximum nominal heat input and the
minimum nominal heat input given in the instructions.
Note 3 to entry: Nominal heat input is expressed in kilowatts (kW).
3.3 Combustion chamber, burner head and test rig
3.3.1
combustion chamber
part of the appliance in which the combustion takes place
3.3.2
pressure in the combustion chamber
p
F
pressure or depression, relative to atmospheric pressure, prevailing in the combustion chamber
Note 1 to entry: Pressure in the combustion chamber is expressed in kilopascals (kPa).
3.3.3
length of the combustion chamber
l
distance between the face of the nozzle or the fuel outlet and the rear wall of the test flame tube or
combustion chamber
Note 1 to entry: Length of the combustion chamber is expressed in metres (m).
3.3.4
diameter of the combustion chamber
d
inner diameter of the combustion chamber around the flame tube of the burner
Note 1 to entry: The diameter of the combustion chamber is measured in metres (m).
3.3.5
burner head
mixing device consisting of an atomizing system and other components for the mixing of air and fuel
EXAMPLE Stabilizing disc.
3.3.6
burner flame tube
device which hosts the mixing device and the root of the flame
3.3.7
test flame tube
cylindrical part of the test rig where the combustion takes place
3.4 Composition of the gaseous combustion products
3.4.1
content of carbon dioxide (CO )
ratio of the volume of carbon dioxide to the total volume of dry gaseous products in which it is present
Note 1 to entry: The carbon dioxide content is expressed as a percentage volume fraction.
3.4.2
content of oxygen (O )
ratio of the volume of oxygen to the total volume of dry gaseous products in which it is present
Note 1 to entry: The oxygen content is expressed as a percentage volume fraction.
3.4.3
content of carbon monoxide (CO)
ratio of the volume of carbon monoxide to the total volume of dry gaseous products in which it is
present
Note 1 to entry: The carbon monoxide content is expressed as a volume fraction, in units of millilitres per cubic
metre (ml/m ) for measuring purposes and in milligrams per kilowatt hour (mg/kWh) related to inferior calorific
value (Hi) for calculation purposes and declaring values.
3.4.4
content of nitrogen oxides (NO )
x
ratio of the combined volume of nitrogen oxides to the total volume of dry gaseous products in which
they are present
Note 1 to entry: The nitrogen oxides content is expressed as a volume fraction, in units of millilitres per cubic
metre (ml/m ) for measuring purposes and in milligrams per kilowatt hour (mg/kWh) related to inferior calorific
value (Hi) for calculation purposes and declaring values.
3.4.5
content of unburned hydrocarbons
ratio of the volume of unburnt hydrocarbons to the total volume of wet combustion products in which
they are present on an air free basis
Note 1 to entry: It is expressed in millilitres per cubic metre (ml/m ), calculated as C3H8.
3.4.6
smoke number
sample reference, the shade of which is closest to that of the comparison scale
Note 1 to entry: See Annex A.
3.4.7
excess air ratio
λ
ratio between the effectively introduced quantity of air and the theoretically required quantity of air
3.5 Adjusting, control and safety devices
3.5.1
flame detector device
device by which the presence of a flame is detected and signalled
Note 1 to entry: It can consist of a flame sensor, an amplifier and an element for signal transmission. These
parts, with the possible exception of the actual flame sensor, can be assembled in a single housing together with a
programming unit.
3.5.2
automatic burner control system
system which comprises at least a programming unit and all the elements of a flame detector device
Note 1 to entry: The various functions of an automatic burner control system can be in one or more housings.
3.5.3
programming unit
device that 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 non-volatile lock-out
Note 1 to entry: The programming unit follows a predetermined sequence of actions and always operates in
conjunction with a flame detector device.
3.5.4
safe-start check
procedure employing a protection circuit or circuits, to establish whether or not a fault in a safety
system or a flame simulating condition exists prior to start-up
3.5.5
controlled shut-down
process by which the power to the fuel shut-off valve(s) is removed based on the removed heat demand
3.5.6
non-volatile lock-out
safety shut-down condition of the system, such that a recycling can only be accomplished by a manual
reset of the system and by no other means
3.5.7
safety shut-down
process which is activated immediately following the response of a safety device or the detection of a
fault in the automatic burner control system and which puts the burner out of operation by immediately
removing the power to the fuel shut-off valve(s) and the ignition device
Note 1 to entry: Safety shut-down can also occur as a result of an interruption/decrease of the power supply.
3.5.8
safety shut-off device
device that automatically cuts off the fuel supply
3.5.9
ignition-restoration
process by which, following loss of flame signal, the ignition device will be switched on again without
total interruption of the fuel supply
3.5.10
recycling
process by which, after a safety shut-down, a full start-up sequence is automatically repeated
3.5.11
pressure switch
switch which compares the actual value of a pressure with the desired value, gives a signal when the
actual value exceeds or drops below the desired value and initiates the shut-off sequence
3.5.12
ignition device
means (flame, electrical ignition or other means) used to ignite the main burner, or the pilot burner if
applicable
3.5.13
remote reset
manual reset after a lock-out carried out from a location different from the safety related device
Note 1 to entry: The connection between the place of reset and the safety related device on the application can
be by electrical or electronic circuit. It complies with the single fault criterion.
3.6 Sequencing
3.6.1
pre-ignition time
period between the start of the ignition cycle and the release of the fuel
Note 1 to entry: Pre-ignition time is expressed in seconds (s).
3.6.2
safety time
t
s
duration of the maximum permissible time during which the automatic burner control system allows
the fuel to be released without there being a flame
Note 1 to entry: Safety time is expressed in seconds (s).
3.6.3
ignition safety time
first safety time
t
smax
time starting from the signal for release of the fuel and terminating at the moment at which the signal
for interrupting the fuel supply is given
Note 1 to entry: Ignition safety time is expressed in seconds (s).
3.6.4
safety time during operation
time starting at the moment the sensed flame is extinguished and ending at the moment the signal for
interrupting the fuel supply is given
Note 1 to entry: Safety time during operation is expressed in seconds (s).
3.6.5
purge time
period during which the combustion chamber is compulsorily ventilated without any fuel being
supplied
Note 1 to entry: Purge time is expressed in seconds (s).
3.6.6
pre-purge time
period during which purge takes place at the proven air rate prior to the energization of the ignition
device
Note 1 to entry: Pre-purge time is expressed in seconds (s).
3.6.7
post-purge time
period between any shut-down and the moment the fan is switched off
Note 1 to entry: Post-purge time is expressed in seconds (s).
3.6.8
total closing time
period that starts with the signal that the flame has been extinguished and ends with the shut-off valves
being closed
Note 1 to entry: The total closing time is expressed in seconds (s).
3.6.9
flame detector device
device by which the presence of a flame is detected and signalled (see Figure 1)
Note 1 to entry: Flame detector devices 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, can be assembled in a single
housing together with a programming unit.
Key
1 automatic burner control system (see 3.5.2) 8 programming unit (see 3.5.3)
2 flame detector device (see 3.6.9) 9 shut-off valve (see 3.5.8)
3 flame 10 shut-off valve terminal
4 flame sensor (see 3.6.11) 11 flame signal (see 3.6.14)
5 amplifier 12 flame failure response time (see 3.6.12.1)
6 filter 13 sensed flame (see 3.6.13)
7 threshold
Figure 1 — Basic functional chain of a typical flame supervision
3.6.10
independent flame detector device
flame detector device which operates independent of the programming unit to provide the class C
control function (see Figure 2)
Note 1 to entry: Self-checking functions are incorporated in this type of flame detector device.

Key
1 independent flame detector device (see 3.6.10) 6 threshold
2 flame 7 flame signal (see 3.6.14)
3 flame sensor (see 3.6.11) 8 flame failure detection time (see 3.6.12.2)
4 amplifier 9 sensed flame (see 3.6.13)
5 filter
Figure 2 — Basic functional chain of an independent flame detector device
3.6.11
flame sensor
device which reacts to the presence of the flame by providing an output signal that is used for further
signal processing
3.6.12
time in case of flame failure
3.6.12.1
flame failure response time
FFRT
response time between the loss of a sensed flame and the resulting de-energizing of the shut-off valve
terminals
Note 1 to entry: FFRT may be referred to as “extinction safety time” in appliance standards.
3.6.12.2
flame
...