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BS EN 676:2020 Forced draught burners for gaseous fuels, 2023
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 General terms and definitions
- 3.2 Combustible gases
- 3.3 Test rig and combustion chamber
- 3.4 Composition of the gaseous combustion products
- 3.5 Burner operation [Go to Page]
- 3.5.1 Gas rate
- 3.5.2 Permanent and intermittent burner operation
- 3.6 Gas line components
- 3.7 Adjusting, control and safety devices
- 3.8 Sequencing times
- 3.9 Combustion
- 3.10 Diagrams
- 4 Constructional and operational requirements – safety requirements and/or protective measures [Go to Page]
- 4.1 Conversion to different gases
- 4.2 Construction [Go to Page]
- 4.2.1 General
- 4.2.2 Design [Go to Page]
- 4.2.2.1 Combustion
- 4.2.2.2 Mechanical safety, stability and control devices
- 4.2.3 Accessibility for maintenance and use
- 4.2.4 Soundness
- 4.2.5 Materials
- 4.2.6 Mounting
- 4.2.7 Connections
- 4.3 Equipment [Go to Page]
- 4.3.1 Motors and fans
- 4.3.2 Electrical safety and EMC related to safety
- 4.3.3 Adjustable air damper
- 4.3.4 Gas line components [Go to Page]
- 4.3.4.1 General
- 4.3.4.2 Manually operated shut-off valve
- 4.3.4.3 Filter/strainer
- 4.3.4.4 Gas pressure regulator
- 4.3.4.5 High gas pressure over load protection device
- 4.3.4.6 Low gas pressure protection device
- 4.3.4.7 Adjustment devices
- 4.3.4.8 Automatic safety shut-off valves
- 4.3.4.9 Ignition device
- 4.3.4.10 Flame detector device
- 4.3.4.11 Air proving device
- 4.3.4.12 Air/gas ratio control devices
- 4.3.4.13 Pressure test points
- 4.3.4.14 Automatic burner control unit
- 4.3.4.15 Valve proving system
- 4.3.4.16 Electrical interfacing with appliances
- 4.4 Functional and operational requirements [Go to Page]
- 4.4.1 General function requirements [Go to Page]
- 4.4.1.1 General
- 4.4.1.2 Burner start-up
- 4.4.1.3 Pre-purge
- 4.4.1.4 Start heat input
- 4.4.1.5 Start gas ignition
- 4.4.1.6 Main burner ignition
- 4.4.1.7 Safety times
- 4.4.1.8 Flame failure during ignition period
- 4.4.1.9 Flame failure during the running condition
- 4.4.1.10 Burner shut-down
- 4.4.2 Operational requirements [Go to Page]
- 4.4.2.1 External soundness
- 4.4.2.2 Resistance of the burner to over-heating
- 4.4.2.3 Temperatures of the control and safety devices
- 4.4.2.4 Ignition, operation and flame stability
- 4.4.2.5 Surface temperatures
- 4.4.3 Heat input range of the burner
- 4.4.4 Dual-fuel burner
- 4.4.5 Working diagram and test diagram [Go to Page]
- 4.4.5.1 Working diagram
- 4.4.5.2 Test diagram
- 4.4.6 Determination of the flame stability and safe range of operation
- 4.4.7 Limiting values for combustion emissions [Go to Page]
- 4.4.7.1 Carbon monoxide (QCO)
- 4.4.7.2 Nitrogen oxide (QNOx)
- 4.4.8 Starting characteristics
- 4.4.9 Appliance categories
- 4.4.10 Reset from lock-out
- 4.5 Machine safety requirements and/or protective measures
- 5 Test methods [Go to Page]
- 5.1 General [Go to Page]
- 5.1.1 Test gases for forced draught burners
- 5.1.2 Test pressures
- 5.1.3 Test rig [Go to Page]
- 5.1.3.1 General
- 5.1.3.2 Test rig for a heat input of less than or equal to 2,4 MW
- 5.1.3.3 Test rig for a heat input greater than 2,4 MW
- 5.1.3.4 Heat transfer medium
- 5.1.3.5 Ambient test conditions
- 5.1.3.6 Evacuation of the combustion products
- 5.1.3.7 Electrical supply
- 5.1.3.8 Installation
- 5.1.3.9 Accuracy of measurements
- 5.1.3.10 Environmental aspects concerning tests
- 5.1.4 Types of test [Go to Page]
- 5.1.4.1 General
- 5.1.4.2 Structural testing
- 5.2 Functional tests [Go to Page]
- 5.2.1 General
- 5.2.2 Start-up
- 5.2.3 Pre-purge
- 5.2.4 Start-up heat input
- 5.2.5 Ignition
- 5.2.6 Safety times [Go to Page]
- 5.2.6.1 General
- 5.2.6.2 First and second safety time
- 5.2.6.3 Safety time during operation
- 5.2.6.4 Failure to ignite
- 5.2.6.5 Total closing time
- 5.3 Operation [Go to Page]
- 5.3.1 External soundness
- 5.3.2 Resistance of the burner to over-heating [Go to Page]
- 5.3.2.1 Nozzle-mixed burners
- 5.3.2.2 Pre-mixed burner
- 5.3.3 Temperature of the control and safety devices
- 5.3.4 Ignition — flame stability
- 5.3.5 Operation — flame stability
- 5.3.6 Auxiliary electricity consumption (ErP)
- 5.3.7 Sound power level LWA (ErP)
- 5.4 Tests to be carried out on the working and test diagrams [Go to Page]
- 5.4.1 Tests at point 1
- 5.4.2 Tests at point Hp1
- 5.4.3 Tests at points 2, 5 (single, multi-stage and modulating burners) and 6 (multi-stage and modulating burners)
- 5.4.4 Tests at points Hp2 (single, multi-stage and modulating burners) and Hp6 (multi-stage and modulating burners)
- 5.4.5 Tests at point 3
- 5.4.6 Tests at point 4
- 5.4.7 Tests at first stage points or minimum heat input
- 5.4.8 Summary
- 5.5 Combustion
- 5.6 Start-up
- 5.7 Obtaining the heat input [Go to Page]
- 5.7.1 Determination of heat input at reference conditions
- 5.7.2 Determination of heat input at ambient conditions
- 5.8 Electrical safety
- 5.9 Verification of safety and /or protective measures
- 6 Marking, labelling and packaging [Go to Page]
- 6.1 General
- 6.2 Data plate
- 6.3 Other marking
- 6.4 Instructions for installation, adjustment, maintenance and operation
- 6.5 Packaging
- 6.6 Marking on the packaging
- Annex A (normative)Determination of combustion characteristics — Carbon monoxide and nitrogen oxides, conversion and corrections [Go to Page]
- A.1 CO content (QCO), calculation from ml/m3 into mg/kWh
- A.2 NOx content (QNOX), calculation from ml/m3 into mg/kWh
- A.3 Correction for the influence of combustion air temperature and humidity on NOx emissions QNOx
- A.4 NOx mean value for evaluating the NOx classes
- A.5 CO2 content fCO2
- A.6 Other conversion factors for emissions, calculated from ml/m3 into mg/m3 at 3 % O2 reference flue gas conditions
- Annex B (informative)Examples of control box sequencing
- Annex C (informative)Test gases [Go to Page]
- C.1 General
- C.2 Conditions for preparation of the test gases
- C.3 Practical application of the test gases [Go to Page]
- C.3.1 Choice of test gases
- C.3.2 Conditions of supply and adjustment of the burner
- Annex D (informative)Gas connections conditions in common use in the various countries
- Annex E (informative)Tests [Go to Page]
- E.1 Supplementary testing
- E.2 Drawing review
- E.3 Individual test and inspection
- E.4 Test report
- Annex F (informative)Use of alternative gas lines and test documentation [Go to Page]
- F.1 Use of alternative gas lines
- F.2 Test documentation
- Annex G (informative)Void
- Annex H (informative)Check of the air proving device
- Annex I (informative)Additional recommendations for specific applications [Go to Page]
- I.1 General
- I.2 Pre-heating of the combustion air
- I.3 Continuous working of the air ventilator
- I.4 Variable excess of combustion air
- I.5 Burner with start gas flame
- I.6 Air filtering
- Annex J (normative)Machine Directive (2006/42/CE) related hazards – safety requirements and/or protective measures) [Go to Page]
- J.1 General
- J.2 List of significant hazards
- J.3 Safety requirements and /or protective measures [Go to Page]
- J.3.1 General
- J.3.2 Additional requirements [Go to Page]
- J.3.2.1 Mechanical safety, stability and control devices
- J.3.2.2 Motors and fans
- J.3.2.3 Electrical safety
- J.4 Verification of machine safety requirements and/or protective measures
- J.5 Information for use [Go to Page]
- J.5.1 General
- J.5.2 Instructions for installation, adjustment, maintenance and operation
- Annex K (normative)Additional requirements for burners with pressurized parts and burners firing pressurized bodies as defined in Pressure Equipment Directive (PED) 2014/68/EU [Go to Page]
- K.1 General
- K.2 Pressurized parts [Go to Page]
- K.2.1 Design
- K.2.2 Materials
- K.2.3 Permanent joints
- K.3 Electrical safety and gas line components [Go to Page]
- K.3.1 Electrical safety
- K.3.2 Gas line components
- K.4 Gas pressure regulator
- K.5 High gas pressure over load protection device
- K.6 Automatic safety shut-off valve
- K.7 Air proving device
- K.8 Automatic burner control system
- K.9 Means for draining and venting
- K.10 General functions requirements
- K.11 External safety limiter
- K.12 Design according to Annex L in conjunction with EN 602041 [Go to Page]
- K.12.1 General
- K.12.2 Pressure control
- K.12.3 Burner control and flame detection
- K.12.4 Safe shut off of the gas supply
- K.12.5 Air/fuel ratio control
- K.12.6 Integration of the superior safety equipment of the boiler and of the firing system.
- K.13 Consideration: safety life cycle
- K.14 Tests of pressurized parts [Go to Page]
- K.14.1 Component pressure strength test
- K.14.2 Component design mechanical deformation test
- K.14.3 Component design welded joint test
- K.14.4 External soundness
- K.15 Other marking
- K.16 Instructions for installation, adjustment, maintenance and operation
- Annex L (normative)Electrical requirements – modifications to EN 60204-1:2006 [Go to Page]
- L.1 Scope
- L.2 Normative references
- L.3 Terms and definitions [Go to Page]
- L.3.1 Protective system
- L.3.2 Safety device
- L.3.3 Sensor
- L.3.4 Protective equipment
- L.3.5 Actuating element
- L.3.6 Control system
- L.4 General requirements [Go to Page]
- L.4.1 General
- L.4.2 Selection of equipment
- L.4.3 Electrical supply
- L.4.4 Physical environment and operating condition [Go to Page]
- L.4.4.1 General
- L.4.4.2 Electromagnetic compatibility (EMC)
- L.4.4.3 Ambient air temperature
- L.4.4.4 Humidity
- L.4.4.5 Altitude
- L.4.4.6 Contaminants
- L.4.4.7 Ionizing and non-ionizing radiation
- L.4.4.8 Vibration, shock, and bump
- L.4.4.9 Equipment used in flammable atmospheres
- L.5 Incoming supply conductor terminations and devices for disconnecting and switching off [Go to Page]
- L.5.1 Devices for disconnecting electrical equipment
- L.6 Protection against electric shock [Go to Page]
- L.6.1 General
- L.6.2 Protection against direct contact
- L.7 Protection of equipment
- L.8 Equipotential bonding
- L.9 Control circuits and control functions [Go to Page]
- L.9.1 Control circuits [Go to Page]
- L.9.1.1 Control circuit supply
- L.9.1.2 Control circuit voltages
- L.9.2 Control functions
- L.9.3 Protective interlocks
- L.9.4 Control functions in the event of failure (Protective system) [Go to Page]
- L.9.4.1 General requirements
- L.9.4.2 Measures to minimize risk in the event of failure
- L.9.4.3 Protection against maloperation due to earth faults, voltage interruptions and loss of circuit continuity
- L.9.4.4 Classification of protective systems
- L.9.4.5 Safety lifecycle for protective systems
- L.9.4.6 Determination of the safety level (PL / SIL) for protective functions
- L.9.4.7 Application software for PLC based protective systems
- L.9.4.8 Installation and commissioning
- L.9.4.9 Safety validation of protective systems
- L.9.4.10 Modification and retrofit
- L.10 Operator interface and machine-mounted control devices
- L.11 Electrical equipment (Controlgear: location, mounting, and enclosures) [Go to Page]
- L.11.1 Degrees of protection
- L.11.2 Access to controlgear
- L.11.3 Creepage distances and clearances
- L.11.4 Transformers
- L.11.5 Switching devices
- L.11.6 Trace heating systems
- L.12 Conductors and cables
- L.13 Wiring practices [Go to Page]
- L.13.1 Conductors of different circuits
- L.14 Electric motors and associated equipment
- L.15 Accessories and lighting [Go to Page]
- L.15.1 Accessories
- L.15.2 Local lighting of the machine and equipment
- L.16 Marking, warning signs and reference designations
- L.17 Technical documentation
- L.18 Verification
- Annex M (informative)Burner equipped to increase the efficiency
- Annex N (informative)Electrical interfaces for burners
- Annex O (informative)Environmental checklist EN 676
- Annex P (informative)Guide for the applicability of the different standards on electrical safety
- Annex Q (informative)Verification procedures for market surveillance purposes (ErP) [Go to Page]
- Q.1 General
- Q.2 Minimization of the influence of the measurement procedure
- Q.3 Verification of the declared parameters
- Annex R (informative)Impact of the variations of the gas quality in EU gas grids to gas burners
- Annex S (informative)A-Deviations
- Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2009/142/EC (GAD) aimed to be covered
- Annex ZB (informative)Relationship between this European Standard and the ecodesign requirements of Commission Regulation (EU) No 813/2013 aimed to be covered [Go to Page]
