EN 437-2003 pdf download.Test gases – Test pressures – Appliance categories.
6 Classification of appliances
6.1 Appliance categories
6.1.1 General
Appliances are classf led into categories defined according to the gases and the pressures for which they are designed.
The defin4tion of the categories follows from 6.1.2, 6.1.3 and 6.1.4.
In each country, taking account of the local gas distribution conditions (gas composition and supply pressures), only some of the categories defined in 6.1.2, 6.1.3 and 6.1.4 are marketed. In addition, some of these categories are used only for certain types of appliance as specified in the individual standards,
The conditions concerning the marketing of these appliance categories in each country and the corresponding supply pressures are given in Tables B.1, 8.2 and B.3 (see also B.4 for the categories marketed locally and nationally, corresponding to the gases and specific supply pressures given in Table 8.5; B.6 gives the particular conditions specific to certain countries).
NOTE See also annex C: Guidelines fo extension to other categories.
6.1.2 Category I
Appliances of category I are designed exclusively for the use of gases of a single family or of a single group.
6.1.2.1 ApplIances designed for use on first family gases only
Category l: appliances using only gases of group a of the first family at the prescribed supply pessure (this category is not used).
6.1.2.2 Appliances designed for use on second family gases only
Category ‘2H• appliance using only gases of group H of the second family at the prescribed supply pressure.
Category 12L: appliances using only gases of group L of the second family at the prescribed supply pressure.
Category 13• appliances capable of using gases of the third family (propane and butane) and operating with a pressure couple without adjustment of the appliance. However, for certain types of appliance specified in the particular standards, adjustment of the primary combustion air may be permitted when changing from propane to butane and vice versa. No gas pressure regulating device is permitted on the appliance.
Category I3: appliances using only gases of group P of the third family (propane) at the prescribed supply pressure. Category l: appliances using only gases of group B of the third family (butane) at the prescribed supply pressure.
Category appliances having a pressure governor using all the gases of the third family which can be adjusted manually in order to utilize the vaflous gases of a group of the third family under the local condition of distribution (see Table B.7).
6.1.3 Category H
Appliances of category II are designed for use on gases of two families.
6.1.3.1 Appliances designed for use on gases of the first and second families
Category LI: appliances capable of using gases of group a of the first family and gases of group H of the second family The first family gases are used under the same conditions as for category I The second family gases are used under the same conditions as for category 1ZH•
6.1.3.2 Appliances designed for use on gases of the second and third families
Category l12H33P: appliances capable of using gases of group H of the second family and gases of the third family. The second family gases are used under the same conditions as for category l. The third family gases are used under the same conditions as for category I,
Category Il: appliances capable of using gases of group H of the second family and gases of the third family. The second family gases are used under the same conditions as for category 12H.The third family gases are used under the same conditions as for category 13
Category II2HW: appliances capable of using gases of group H of the second family and gases of group P of the third family. The second family gases are used under the same conditions as for category l. The third family gases are used under the same conditions as for category ‘3F’
Category ll,: appliances capable of using gases of group L of the second family and gases of the third family. The second family gases are used under the same conditions as for category 121. The third family gases are used under the same conditions as for category 1.EN 437-2003 pdf download.