NS EN 525 : 2009

Foreword
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 appliance and packaging
    3.7 Classification
4 Construction and design requirements
    4.1 General
    4.2 Adjusting, control and safety devices
    4.3 Ignition devices
    4.4 Combustion and dilution air, pre-purge and
          post-purge
    4.5 Flame supervision system
    4.6 Start-gas flame establishment
    4.7 Main flame establishment
    4.8 Main burner
    4.9 Facility for remote control
    4.10 Thermostats and control of air temperature
    4.11 Gas pressure test points
    4.12 Facilities for commissioning and testing
    4.13 Additional requirements for appliances designed
          for permanent outdoor installation
5 Operational requirements
    5.1 Soundness of the gas circuit
    5.2 Heat inputs
    5.3 Limiting temperatures
    5.4 Ignition, cross-lighting, flame stability
    5.5 Combustion
    5.6 Overheat cut-off device
    5.7 Air proving device(s)
    5.8 Weather resistance
6 Test methods
    6.1 General
    6.2 Automatic burner control systems (manually
          operated devices)
    6.3 Safety of operation
7 Marking and instructions
    7.1 General
    7.2 Description
    7.3 Data plate
    7.4 Other marking
    7.5 Marking on the packaging
    7.6 Profile plate
    7.7 Instructions
Annexes
A (informative) National situations
    A.1 Categories listed in this standard and marketed
          in the different countries
    A.2 Appliance supply pressures corresponding to the
          categories given
    A.3 Special categories marketed nationally or locally
    A.4 Test gases and test pressures corresponding to the
          special gases given in A.3
    A.5 Gas connections in the various countries
B (normative) Identification of symbols used for marking
    B.1 Designation of country of destination
    B.2 Category
    B.3 Supplementary transitional information
C (informative) Guidance for limitations of applications of
    direct-fired air heaters in buildings
    C.1 General requirements
    C.2 Safe operating emission levels
    C.3 Assessment of concentrations
    C.4 Case studies
D (normative) Requirements for high-voltage ignition
    circuits
    D.1 General
    D.2 Additional requirements
    D.3 Testing
    D.4 Measurement
    D.5 Protection
E (normative) Special national conditions
ZA (informative) Clauses of this European Standard
    addressing requirements or provisions of EU Directives
Tables
1 Classification of gases
2 Limiting emission concentrations
3 Characteristics of the test gases. Gas dry at 15 deg C
    and 1 013,25 mbar
4 Calorific values of the test gases of the third family
5 Test gases corresponding to the appliance categories
6 Test pressures where no pressure couple exists
7 Test pressures where a pressure couple exists
    A.1.1 Single categories marketed
    A.1.2 Double categories marketed
            A.2 Normal supply pressures
            A.3 Test gases corresponding to categories
                  marketed nationally or locally
            A.4 Untitled
            A.5 Inlet connections permitted
            B.1 Gas type symbols
            B.2 Means of identification of the types of
                  gas in force in the various countries
            C.1 Maximum concentration values of CO2/
                  fresh air
Figures
1 Arrangement of spray heads and associated piping for
    the weather resistance test
2 Detail of spray head assembly and construction
    D.1 Test bench for ignition means

Describes the requirements and test methods for the safety of non domestic direct gas fired forced convection air heaters having fully automatic control systems, hereafter referred to as "appliances".