Gas-fired central heating boilers —Type B11 and B11BS boilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW
Foreword
1 General
1.1 Field of application
1.2 Normative references
1.3 Definitions
1.3.1 Reference conditions
1.3.2 Combustible gases
1.3.3 Constituent parts of the boiler
1.3.4 Operation of the boiler
1.4 Classification
1.4.1 Classification of gases
1.4.2 Classification of boilers
2 Constructional requirements
2.1 General
2.1.1 Conversion to different gases
2.1.2 Materials and methods of construction
2.1.3 Design
2.1.4 Use and servicing
2.1.5 Connections to the gas and water pipes
2.1.6 Soundness
2.1.7 Supply of combustion air and evacuation of the combustion products
2.1.8 Checking the state of operation
2.1.9 Drainage
2.1.10 Electrical equipment
2.1.11 Operational safety in the event of failure of the auxiliary energy
2.1.12 Protection against frost for boilers intended to be installed in a partially protected place
2.2 Requirements for adjusting, control and safety devices
2.2.1 General
2.2.2 Adjuster and range-rating device
2.2.3 Gas circuit
2.2.4 Gas governor
2.2.5 Ignition devices
2.2.6 Flame supervision devices
2.2.7 Thermostats and water temperature limiting devices
2.2.8 Remote control
2.2.9 Expansion vessel and pressure gauge
2.2.10 Combustion products discharge
safety device
2.2.11 Protection against frost for boilers intended to be installed in a partially protected place
2.3 Burners
2.4 Pressure test points
2.5 Chemical composition of the condensate
3 Operational requirements
3.1 General
3.2 Soundness
3.2.1 Soundness of the gas circuit
3.2.2 Soundness of the combustion circuit
3.2.3 Soundness of the water circuit
3.3 Nominal. maximum and minimum
heat inputs and nominal output
3.3.1 General
3.3.2 Nominal heat input
3.3.3 Maximum and minimum heat input
3.3.4 Minimum heat input for ignition
3.3.5 Nominal output
3.4 Safety of operation
3.4.1 Limiting temperatures
3.4.2 Ignition—Cross lighting—Flame stability
3.5 Adjusting, control and safety devices
3.5.1 General
3.5.2 Control devices
3.5.3 Automatic valves
3.5.4 Ignition devices
3.5.5 Flame supervision devices
3.5.6 Gas governor
3.5.7 Thermostats and water temperature limiting devices
3.5.8 Combustion products discharge safety device
3.6 Combustion
3.6.1 Carbon monoxide
3.6.2 Other pollutants
3.7 Useful efficiencies
3.7.1 Useful efficiency at the nominal heat input
3.7.2 Useful efficiency at part load
3.8 Criteria for condensation in the flue
3.9 Resistance of the materials to pressure
3.9.1 General
3.9.2 Boilers of pressure class 1
3.9.3 Boilers of pressure class 2
3.9.4 Boilers of pressure class 3
3.10 Hydraulic resistance
3.11 Condensation in the boiler
3.12 —Spare
3.13 Frost protection system for boilers intended to be installed in a partially protected place
3.14 Protection against the ingress of rain
4 Test methods
4.1 General
4.1.1 Characteristics of the reference and limit gases
4.1.2 Requirements for the preparation of test gases
4.1.3 Carrying out the tests
4.1.4 Test pressures
4.1.5 Conduct of the tests
4.1.6 General test conditions
4.1.7 Summary of the test conditions
4.2 Soundness
4.2.1 Soundness of the gas circuit
4.2.2 Soundness of the combustion circuit
4.2.3 Soundness of the water circuit
4.3 Nominal, maximum and minimum heat inputs and nominal output
4.3.1 General
4.3.2 Nominal heat input
4.3.3 Maximum and minimum heat input
4.3.4 Minimum heat input for ignition
4.3.5 Nominal output
4.4 Safety of operation
4.4.1 Limiting temperatures
4.4.2 Ignition —Cross lighting —Flame stability
4.5 Adjusting, control and safety devices
4.5.1 General
4.5.2 Control devices
4.5.3 Automatic valves
4.5.4 Ignition devices
4.5.5 Flame supervision de
BS EN 297:1994 Referenced Document
EN 125 Flame supervision devices for gas burning appliances - Thermoelectric flame supervision devices*， 2022-10-12 Update
EN 126 Multifunctional controls for gas burning appliances*， 2014-11-01 Update
EN 161 Automatic shut-off valves for gas burners and gas appliances*， 2022-10-12 Update
EN 278 Rubber Materials for Diaphragms in Domestic Appliances Using Combustible Gases up to 200 mbar
EN 88 Pressure Governors for Gas Appliances for Inlet Pressures up to 200 mbar*， 2001-05-01 Update
BS EN 297:1994 history
2012BS EN 15502-2-1:2012 Gas-fired central heating boilers. Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1000 kW
1994BS EN 297:1994 Gas-fired central heating boilers. Type B11 and B11BS boilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW
1988BS 6332-1:1988 Thermal performance of domestic gas appliances - Specification for thermal performance of central heating boilers and circulators
1986BS 5258-1:1986 Safety of domestic gas appliances - Specification for central heating boilers and circulators