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eLibrary > BS EN 26:2015 Gas-fired instantaneous water heaters for the production of domestic hot water >

BS EN 26:2015 Gas-fired instantaneous water heaters for the production of domestic hot water, 2015

Contents Page
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of water heaters [Go to Page]
4.1 General
4.2 Classification of gases
4.3 Appliance categories
4.4 Mode of supply of the combustion air and evacuation of the combustion products (appliance types)
4.5 Water pressure [Go to Page]
4.5.1 General
4.5.2 Low pressure appliances
4.5.3 Normal pressure appliances
4.5.4 High pressure appliances
5 Constructional requirements [Go to Page]
5.1 Conversion to different gases [Go to Page]
5.1.1 Introduction
5.1.2 General [Go to Page]
5.1.2.1 Introduction
5.1.2.2 Permissible operations for changing gases
5.1.3 Materials [Go to Page]
5.1.3.1 General
5.1.3.2 Metallic materials
5.1.3.3 Non-metallic materials
5.1.4 Design - Assembly - Strength
5.1.5 Accessibility - Ease of maintenance - Fitting and removal
5.1.6 Gas connections
5.1.7 Means of achieving soundness [Go to Page]
5.1.7.1 Soundness of the gas circuit
5.1.7.2 Soundness of the combustion circuit
5.1.8 Supply of combustion air and evacuation of the combustion products [Go to Page]
5.1.8.1 All appliances
5.1.8.2 Type AAS appliances
5.1.8.3 Type B appliances
5.1.8.4 Separate combustion products evacuation duct
5.1.8.5 Type C appliances
5.1.8.6 Special requirements for certain components of water heaters with a fan
5.1.9 Checking the state of operation
5.1.10 Drainage
5.1.11 Electrical safety [Go to Page]
5.1.11.1 General
5.1.11.2 Controls
5.1.12 Operational safety in the event of failure of the auxiliary energy
5.2 Adjusting, control and safety devices [Go to Page]
5.2.1 General
5.2.2 Manual shut off valves and/or gas rate adjusters
5.2.3 Preset gas rate adjusters
5.2.4 Gas pressure regulator
5.2.5 Pressure test points
5.2.6 Automatic water-operated gas valve
5.2.7 Ignition devices [Go to Page]
5.2.7.1 Ignition burner
5.2.7.2 Manual ignition of the ignition burner
5.2.7.3 Automatic ignition device
5.2.8 Flame supervision device [Go to Page]
5.2.8.1 General
5.2.8.2 Thermoelectric device of a permanent ignition burner
5.2.8.3 Flame supervision device of an appliance with an intermittent safety ignition burner
5.2.8.4 Flame supervision devices for automatic burner control systems
5.2.9 Atmosphere sensing device for type AAS appliances
5.2.10 Combustion products discharge safety device for type B11BS, B12BS and B13BS appliances
5.2.11 Protection against accidental overheating of thermostatic appliances
5.2.12 Composition of the gas circuit
5.2.13 Protection against frost for appliances intended to be installed in a partially protected place
5.2.14 Protection against the ingress of rain
5.3 Main burner
5.4 Supplementary requirements for condensing water heaters [Go to Page]
5.4.1 Materials in contact with condensate
5.4.2 Discharge of condensate [Go to Page]
5.4.2.1 Requirements
5.4.2.2 Test conditions
5.4.3 Control of the combustion products temperature
5.4.4 Chemical composition of the condensate
6 Operational requirements [Go to Page]
6.1 General [Go to Page]
6.1.1 Introduction
6.1.2 Characteristics of the test gases
6.1.3 Requirements for preparation of the test gases
6.1.4 Choice of test gases
6.1.5 Test pressures
6.1.6 General test conditions [Go to Page]
6.1.6.1 General
6.1.6.2 Test room
6.1.6.3 Conditions of installation
6.1.6.4 Water supply
6.1.6.5 Measurement uncertainties
6.1.6.6 Adjustment of the appliance
6.1.6.7 Testing conditions
6.1.6.8 Electrical supply
6.2 Soundness [Go to Page]
6.2.1 Soundness of the gas circuit [Go to Page]
6.2.1.1 General
6.2.1.2 Requirement
6.2.1.3 Test
6.2.2 Soundness of the combustion circuit and evacuation of the combustion products [Go to Page]
6.2.2.1 General
6.2.2.2 General requirements
6.2.2.3 Soundness of the air supply and combustion product circuit type C appliances
6.2.2.4 Soundness of the combustion product circuit of Type B appliances
6.2.3 Soundness of the water circuit [Go to Page]
6.2.3.1 Requirements
6.2.3.2 Tests
6.3 Heat inputs [Go to Page]
6.3.1 General [Go to Page]
6.3.1.1 Heat input obtained
6.3.1.2 Corrected heat input
6.3.2 Nominal heat input [Go to Page]
6.3.2.1 Appliances without a preset adjuster
6.3.2.2 Appliances with preset adjusters
6.3.3 Minimum heat input [Go to Page]
6.3.3.1 Requirement
6.3.3.2 Test
6.4 Temperature of the control knobs [Go to Page]
6.4.1 Requirements
6.4.2 Test
6.5 Temperature of the adjustering, control and safety devices [Go to Page]
6.5.1 Requirement
6.5.2 Test
6.6 Temperature of the appliance casing, the surface on which it is installed and adjacent surfaces and external temperature of the ducts [Go to Page]
6.6.1 Requirements
6.6.2 Tests
6.7 Ignition - Cross-lighting - Flame stability [Go to Page]
6.7.1 Operation in still air for all appliances [Go to Page]
6.7.1.1 Requirements
6.7.1.2 Test
6.7.2 Supplementary tests for appliances of types AAS and B1 except for B14 [Go to Page]
6.7.2.1 Requirements
6.7.2.2 Tests
6.7.3 Supplementary tests for type C11 appliances and outdoors and/or partially protected appliances [Go to Page]
6.7.3.1 Requirements
6.7.3.2 Tests
6.7.3.3 Resistance to draught for water heaters intended to be installed in a partially protected place
6.7.4 Supplementary tests for type C2 appliances [Go to Page]
6.7.4.1 Requirements
6.7.4.2 Tests
6.7.5 Supplementary tests for appliances of types C12, C13, C32, C33, B4 and B5 [Go to Page]
6.7.5.1 Requirements
6.7.5.2 Tests
6.7.6 Supplementary tests for type C42 and type C43 appliances [Go to Page]
6.7.6.1 Requirements
6.7.6.2 Tests
6.7.7 Supplementary tests for type C52 and type C53 appliances [Go to Page]
6.7.7.1 Requirements
6.7.7.2 Tests
6.7.8 Supplementary tests for type C6 appliances [Go to Page]
6.7.8.1 Requirements
6.7.8.2 Tests
6.7.9 Supplementary tests for type C72 and type C73 appliances [Go to Page]
6.7.9.1 Requirements
6.7.9.2 Tests
6.7.10 Supplementary tests for type C82 and type C83 appliances [Go to Page]
6.7.10.1 Requirements
6.7.10.2 Tests
6.7.11 Functioning of a permanent ignition burner when the fan stops during the standby time [Go to Page]
6.7.11.1 Requirements
6.7.11.2 Tests
6.7.12 Air proving device for fan assisted water heaters [Go to Page]
6.7.12.1 Supervision of the pressure or of the rate of the combustion air or of the combustion products
6.7.12.2 Supervision of the combustion air or combustion products pressure
6.7.12.3 Supervision of the combustion air or combustion products rate
6.7.12.4 Gas/air ratio control
6.7.12.5 Supplementary test for type B water heaters with draught diverter
6.7.13 Functioning of the fan of types C42 and C43 water heaters [Go to Page]
6.7.13.1 Requirements
6.7.13.2 Test
6.7.14 Protection against the accumulation of gas in the combustion circuit [Go to Page]
6.7.14.1 General
6.7.14.2 Verification of the protected nature of a combustion chamber
6.7.14.3 Verification of normal ignition in a combustible air/gas mixture for types C12 and C13 water heaters
6.7.15 Leakage of combustion products from type C7 water heaters [Go to Page]
6.7.15.1 Requirements
6.7.15.2 Test
6.7.16 Supplementary tests for type B14, B2 and B3 water heaters [Go to Page]
6.7.16.1 Requirement
6.7.16.2 Test
6.8 Adjusting, control and safety devices [Go to Page]
6.8.1 General
6.8.2 Control devices [Go to Page]
6.8.2.1 Rotary knob
6.8.2.2 Push-button
6.8.3 Closing mechanisms and the automatic water operated gas valve [Go to Page]
6.8.3.1 Sealing force
6.8.3.2 Opening and closing function
6.8.3.3 Closing time
6.8.3.4 Endurance
6.8.4 Ignition devices [Go to Page]
6.8.4.1 Automatic ignition devices
6.8.4.2 Heat input of ignition burners
6.8.5 Safety times [Go to Page]
6.8.5.1 Appliances with a thermoelectric device
6.8.5.2 Appliances with an intermittent safety ignition burner
6.8.5.3 Appliances with automatic burner control systems
6.8.5.4 Delayed ignition
6.8.6 Pressure regulator [Go to Page]
6.8.6.1 Requirement
6.8.6.2 Test
6.8.7 Adjustment of the water rate - Maximum water temperature (all appliances) [Go to Page]
6.8.7.1 Requirement
6.8.7.2 Test
6.8.8 Overheating of the water [Go to Page]
6.8.8.1 Requirement
6.8.8.2 Test
6.8.9 Effectiveness of the protection against accidental overheating of thermostatic appliances [Go to Page]
6.8.9.1 Requirements
6.8.9.2 Tests
6.8.10 Atmosphere sensing device for type AAS appliances [Go to Page]
6.8.10.1 Sensitivity of the device to lack of ventilation in the room
6.8.10.2 Sensitivity of the device to fouling of the heating body
6.8.10.3 Operating defect of the device
6.8.11 Combustion products discharge safety device of type B11BS appliances [Go to Page]
6.8.11.1 General
6.8.11.2 Test conditions
6.8.11.3 Nuisance shutdown
6.8.11.4 Shutdown times
6.9 Combustion [Go to Page]
6.9.1 Requirements
6.9.2 Test [Go to Page]
6.9.2.1 General
6.9.2.2 Test in still air
6.9.2.3 Water heaters using gas/air ratio controls
6.9.2.4 Supplementary tests
6.9.3 Nitrogen oxides emissions [Go to Page]
6.9.3.1 General
6.9.3.2 Weighting
6.10 Soot deposition [Go to Page]
6.10.1 Requirement
6.10.2 Test
6.11 Frost protection system for appliances intended to be installed in a partially protected place
6.12 Protection against ingress of rain
6.13 Supplementary tests for condensing water heaters [Go to Page]
6.13.1 Formation of condensate [Go to Page]
6.13.1.1 Requirements
6.13.1.2 Test conditions
6.13.2 Temperature of combustion products [Go to Page]
6.13.2.1 Requirement
6.13.2.2 Test conditions
6.14 Electrical power measurements [Go to Page]
6.14.1 General
6.14.2 Nominal and minimal conditions
6.14.3 Standby
6.15 Measurement of standby heat losses
7 Rational use of energy [Go to Page]
7.1 General
7.2 Heat input of ignition burners [Go to Page]
7.2.1 Requirement
7.2.2 Test
7.3 Efficiency [Go to Page]
7.3.1 Requirement
7.3.2 Test
8 Fitness for purpose [Go to Page]
8.1 General
8.2 Constructional characteristics [Go to Page]
8.2.1 Water connections
8.2.2 Preset water rate adjuster
8.2.3 Temperature selector and summer-winter switch
8.2.4 Designation and measurement of reference temperatures of flue systems [Go to Page]
8.2.4.1 Nominal working combustion products temperature
8.2.4.2 Overheat combustion products temperature
8.2.5 Mechanical resistance and stability of ducts, terminal and fitting pieces [Go to Page]
8.2.5.1 General
8.2.5.2 Compressive strength
8.2.5.3 Lateral strength
8.3 Requirements for plastic in the combustion product evacuation ducts, terminals and fitting pieces for appliances [Go to Page]
8.3.1 Thermal resistance
8.3.2 Materials [Go to Page]
8.3.2.1 Characterization
8.3.2.2 Long-term resistance to thermal load
8.3.2.3 Long-term resistance to condensate exposure
8.3.2.4 Resistance to condensing/non-condensing cycling
8.3.2.5 Resistance to ultraviolet radiation (UV)
8.3.2.6 Geometrical stability
8.3.2.7 Reaction to fire
8.4 Requirements for elastomeric seals and elastomeric sealants in the combustion product evacuation ducts, terminals and fitting pieces [Go to Page]
8.4.1 Characterization
8.4.2 Long-term resistance to thermal load
8.4.3 Long-term resistance to condensate exposure
8.4.4 Cyclic condensate resistance test
8.4.5 Relaxation behaviour
8.4.6 Compression set
8.4.7 Low temperature resistance
8.4.8 Joints in elastomeric seals [Go to Page]
8.4.8.1 Durability
8.4.8.2 Strength
8.5 Operational characteristics [Go to Page]
8.5.1 Minimum heat input [Go to Page]
8.5.1.1 Requirement
8.5.1.2 Test
8.5.2 Nominal and minimum useful outputs [Go to Page]
8.5.2.1 Requirements
8.5.2.2 Tests
8.5.3 Ignition of permanent ignition burners by a spark generator [Go to Page]
8.5.3.1 Requirement
8.5.3.2 Test
8.5.4 Ignition opening time (TIA) [Go to Page]
8.5.4.1 Requirement
8.5.4.2 Test
8.5.5 Automatic water-operated gas valve [Go to Page]
8.5.5.1 Normal and high water pressure appliances
8.5.5.2 Low water pressure appliances
8.5.6 Adjustment of the water rate - Water temperature [Go to Page]
8.5.6.1 Fixed output or adjustable output appliances
8.5.6.2 Appliances with automatic output variation
8.5.7 Heating-up time [Go to Page]
8.5.7.1 Requirement
8.5.7.2 Test
8.5.8 Specific rate
9 Marking and instructions [Go to Page]
9.1 Appliance marking [Go to Page]
9.1.1 Data plate
9.1.2 Supplementary markings
9.1.3 Supplementary marking and instructions in the case of water heaters to be installed in partially protected places [Go to Page]
9.1.3.1 General information
9.1.3.2 Warning on the water heaters and the packaging
9.1.3.3 Technical instructions
9.1.4 Packaging
9.1.5 Warnings on the appliance and the packaging [Go to Page]
9.1.5.1 General
9.1.5.2 For all appliances
9.1.5.3 For type AAS appliances
9.1.5.4 For type B11, B12 and B13 appliances
9.1.5.5 For type AAS, B11BS, B12BS and B13BS appliances
9.1.6 Other information
9.2 Instructions [Go to Page]
9.2.1 Installation instructions [Go to Page]
9.2.1.1 Introduction
9.2.1.2 General
9.2.1.3 For installation and adjustment of the gas circuit
9.2.1.4 For installation of the domestic hot water
9.2.1.5 For installation on the combustion products circuit
9.2.1.6 Supplementary instructions for condensing appliances
9.2.2 User's instructions [Go to Page]
9.2.2.1 Introduction
9.2.2.2 General
9.2.2.3 For type AAS appliances
9.2.2.4 For type B11BS, B12BS, B13BS appliances
9.2.2.5 For type C appliances
9.2.2.6 Supplementary use and maintenance instructions for condensing appliances
9.2.3 Conversion instructions
9.3 Presentation
10 Ecodesign Data [Go to Page]
10.1 Water heating energy efficiency (ηwh)
10.2 Nitrogen oxides emissions
10.3 Additional product information
11 Energy Labelling Data [Go to Page]
11.1 General
11.2 Printed label [Go to Page]
11.2.1 General
11.2.2 Annual Electricity Consumption (AEC)
11.2.3 Annual Fuel Consumption (AFC)
11.2.4 Sound power level (LWA)
11.3 Product fiche
11.4 Technical documentation
Annex A (informative)National situations [Go to Page]
A.1 General
A.2 Gas connections in common use in the various countries
A.3 Flue pipe diameters in force in the various countries
Annex B (normative) Test apparatus for type C1, C3, B4 and B5 water heaters (see 6.7.3.2)
Annex C (normative)Test apparatus for type C21 appliances (see 6.7.4.2)
Annex D (normative)Description of the sealed room for the tests of type AAS appliances (see 6.8.10.1.2.1) [Go to Page]
D.1 Configuration of the sealed room
D.2 Soundness of the room
D.3 Effectiveness of mixing
D.4 Equipment of the room
Annex E (informative)Soundness of the gas circuit test - Volumetric method (see 6.1.6.5 and 6.2.1.3) [Go to Page]
E.1 Equipment
E.2 Test method
Annex F (informative)Principal symbols and abbreviations used
Annex G (informative)Guidelines for extension to other categories
Annex H (informative) A deviations
Annex I (normative)Lists of materials currently used [Go to Page]
I.1 General
I.2 Special types of steel
I.3 Copper and copper alloys
I.4 Plastic materials
Annex J (normative)Test methods to determine the effects of to long-term thermal load, long-term condensate exposure, condensing/ non-condensing cycling and resistance to UV radiation
Annex K (informative)NOx conversion calculation
Annex L (normative)Parts in copper or copper alloys
Annex M (informative)Compilation of the test conditions for the various gas families
Annex N (informative)Alternative Method for the determination of the nominal heat input or the maximum and minimum heat input (according to 6.3.1) for appliances using a pneumatic gas/air ratio control system
Annex ZA (informative)Relationship between this European Standard and the requirements of EU Directive 2009/142/EC
Annex ZB (informative)Relationship between this European Standard and the requirements of Commission Regulation (EU) No 814/2013
Annex ZC (informative)Relationship between this European Standard and the requirements of Commission Delegated Regulation (EU) No 812/2013 [Go to Page]

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