NS EN 778 : 2009

1 Scope
2 Normative references
3 Definitions
    3.1 Appliance and its constituent parts
    3.2 Adjusting, control and safety devices
    3.3 Operation of the appliance
    3.4 Gases
    3.5 Conditions of operation and measurement
    3.6 Marking of the appliance and packaging
    3.7 Classification
          3.7.1 Classification of gases
          3.7.2 Classification of appliances
4 Construction and design requirements
    4.1 General
          4.1.1 Conversion to different gases
          4.1.2 Materials and method of construction
          4.1.3 Accessibility for maintenance and use
          4.1.4 Thermal insulation
          4.1.5 Gas connection
          4.1.6 Soundness
          4.1.7 Supply of combustion air and evacuation
                 of combustion products
          4.1.8 Supply and distribution of air for space
          4.1.9 Checking the state of operation of the
                 burner
          4.1.10 Electrical equipment
          4.1.11 Operational safety in the event of
                 fluctuation, interruption and restoration
                 of the auxiliary energy
          4.1.12 Motors and fans
          4.1.13 Air filter
    4.2 Adjusting, control and safety devices
          4.2.1 General
          4.2.2 Gas rate adjusters and range-rating devices
          4.2.3 Aeration adjusters
          4.2.4 Manual controls
          4.2.5 Governors
          4.2.6 Multifunctional controls
          4.2.7 Automatic shut-off valves
          4.2.8 Automatic burner control systems
          4.2.9 Gas strainers
    4.3 Ignition devices
          4.3.1 General
          4.3.2 Ignition device for the main burner
          4.3.3 Ignition burners
    4.4 Flame supervision system
          4.4.1 General
          4.4.2 Appliances with non-automatic burner
                 systems
          4.4.3 Appliances with automatic burner systems
    4.5 Start-gas flame establishment
          4.5.1 Appliances with non-automatic burner
                 systems
          4.5.2 Appliances with automatic burner systems
    4.6 Main flame establishment
          4.6.1 Appliances with non-automatic burner
                 systems
          4.6.2 Appliances with automatic burner systems
    4.7 Main burner
    4.8 Facility for remote control
    4.9 Thermostats and control of air temperature
          4.9.1 General requirements
          4.9.2 Overheat limit device
          4.9.3 Overheat cut-off device
          4.9.4 Air delivery fan control
          4.9.5 Sensors
    4.10 Gas pressure test points
5 Operational requirements
    5.1 General
    5.2 Safety of operation
          5.2.1 Soundness
          5.2.2 Heat inputs
          5.2.3 Limiting temperatures
          5.2.4 Ignition, cross-lighting, flame stability
          5.2.5 Combustion
          5.2.6 Overheat protection
          5.2.7 Heat exchanger thermal cycling
          5.2.8 Atmosphere sensing device (type B11AS)
          5.2.9 Combustion products discharge safety system
                 (type B[IIBS])
    5.3 Efficiency
6 Test methods
    6.1 General
          6.1.1 Characteristics of test gases: reference
                 and limit gases
          6.1.2 Conditions for preparation of the test
                 gases
          6.1.3 Practical application of test gases
          6.1.4 Test pressures
          6.1.5 General test conditions
    6.2 Construction and design
          6.2.1 Automatic burner control systems (manually
                 operated devices)
          6.2.2 Ignition opening time
          6.2.3 Extinction safety time
          6.2.4 Safety times
    6.3 Safety of operation
          6.3.1 Soundness
          6.3.2 Heat inputs
          6.3.3 Limiting temperatures
          6.3.4 Ignition, cross-lighting, flame stability
          6.3.5 Combustion
          6.3.6 Overheat production
          6.3.7 Heat exchanger thermal cycling
          6.3.8 Atmosphere sensing device (type B[IIAS])
          6.3.9 Combustion products discharge safety
                 system (type B[IIBS])
    6.4 Efficiency
          6.4.1 General conditions of test
          6.4.2 Test conditions
          6.4.3 Test procedure
          6.4.4 Accuracy of measurement
          6.4.5 Calculation of efficiency
          6.4.6 Supplementary test for appliances with a
                 modulating or high/low control
7 Marking and instructions
    7.1 Marking of the appliance
    7.2 Marking of the packaging
    7.3 Utilization of symbols on the appliance and
          packaging
          7.3.1 Electrical supply
          7.3.2 Type of gas
          7.3.3 Gas supply pressure
          7.3.4 Country of destination
          7.3.5 Category
          7.3.6 Other information
          7.3.7 Emissions
    7.4 Instructions
          7.4.1 General
          7.4.2 Technical instructions for the installer
          7.4.3 Instructions for the user
Annex A (informative) National situations
Annex B (informative) Equivalence rules
Annex C (normative) Requirements for high-voltage ignition
         circuits
Annex D (informative) Means of identification of the various
         types of gas in force in the various countries
Annex E (informative) A-deviations
Annex F (normative) Special national conditions
Annex G (informative) Calculation of conversions of NO[x]
Annex ZA (informative) Clauses of this European Standard
         addressing requirements or provisions of EU
         Directives

Describes the requirements and test methods for the safety and efficiency of domestic gas-fired air heaters with (an) atmospheric burner(s).