NEN EN 12752-1 : 1999

      Foreword
1 Scope
2 Normative references
3 Definitions
      3.1 Tumble dryers
      3.2 Gases
      3.3 Conditions of operation and measurement
      3.4 Appliance construction
      3.5 Immobilizing an adjuster or a control
      3.6 Appliance performance
      3.7 Marking of the appliance and packaging
4 Classification of appliances
      4.1 Classification according to the nature of the
             gases used (categories)
      4.2 Classification according to the mode of supply
             of the combustion air and evacuation of the
             combustion products
5 Construction and design requirements
      5.1 General
      5.2 Requirements for adjusting, control and safety
             devices
      5.3 Ignition devices
      5.4 Ignition burner or start-gas flame establishment
      5.5 Main flame establishment
      5.6 Burners
      5.7 Thermostats and control of air temperature
      5.8 Clocks and timing devices
      5.9 Gas pressure test points
      5.10 Door interlocks
6 Operational safety
      6.1 General
      6.2 Screw connections
      6.3 Mechanical hazards
      6.4 Manually operate devices of the automatic burner
             control system
      6.5 Soundness
      6.6 Heat inputs
      6.7 Burners
      6.8 Limiting temperature of various parts of the
             appliance
      6.9 Limiting temperature of floor, walls and worktop
      6.10 Limiting temperature of components
      6.11 Motor temperatures
      6.12 Ignition, cross-lighting and flame stability
      6.13 Flame supervision devices
      6.14 Governors
      6.15 Combustion
      6.16 Sooting
      6.17 Cyclic operation test
      6.18 Spillage monitoring device (Type B11BS appliances)
7 Marking
      7.1 Marking of the appliance
      7.2 Marking of the packaging
      7.3 Utilization of symbols on the appliance and
             packaging
      7.4 Instructions
      7.5 Presentation
Table 1 - Classification of gases
Table 2 - Characteristics of the test gases
Table 3 - Calorific values of the test gases of the third
          family
Table 4 - Test gases corresponding to appliance categories
Table 5 - Test pressures where no pressure couple exists
Table 6 - Test pressures where a pressure couple exists
Table 7 - Standard load I for cotton (dry cotton load
          programme)
Table 8 - Standard load II for cotton (dry cotton load
          programme)
Table 9 - Torque values for screws
Table 10 - Maximum temperature rise in parts of the appliance
           that are likely to be touched accidentally
Table 11 - VC02,N values
Table 12 - Shut-down time as a function of the blockage
Table 13 - Symbols of the reference gases
Table 14 - Means of identification of types of gas in use in
           the various countries
Figure 1 - Apparatus for measuring floor and wall temperatures
Figure 2 - Probe for measuring surface temperatures
Figure 3 - Test of Type B11 and Type B11BS appliances under
           abnormal draught conditions
Figure 4 - Spillage monitoring device
Annex A (informative) National situations
      A.1 - Categories listed in the body of the standard
            marketed in the different countries
      A.2 - Appliance supply pressure corresponding to the
            categories given in A.1
      A.3 - Special categories marketed nationally or locally
            and corresponding test gases
      A.4 - Test gases corresponding to the special categories
            given in A.3
      A.5 - Gas connections in the various countries
      A.6 - Flue connections in the various countries
      A.7 - Equivalence rules
Annex B (normative) Special national conditions
Annex ZA (informative) Clauses of this European Standard
                       addressing essential requirements or
                       other provisions of EU Directives

Outlines the requirements and test procedures for the construction, safety and marking of gas-fired type B tumble dryers not exceeding a nominal heat input of 20 kW and with drum volume not exceeding 350 litres. Applicable to types B22 and B23 direct gas-fired, and to types B11 and B11BS indirect gas-fired appliances. Excludes: catalytic combustion appliances; appliances intended for use in locations where special conditions prevail, such as the presence of corrosive or explosive atmosphere; appliances of the condensing type; those intended for use in vehicles or on board ships or aircraft; and those of types B22D and B23D.