BS EN 777-3:2009 pdf download – Multi-burner gas-fired overhead radiant tube heater systems for non domestic use Part 3: System F — Safety 5.1.1.2.1 Categories of system designed for use with gases of the first and second families Adjustment of the gas rate with, if necessary, a change of injector, restrictor or regulator. Adjustment of the gas rate of the ignition burner, either by using an adjuster or by a change of injector or restrictor and, if necessary, a change of the complete ignition burner or of some of its parts. Putting the regulator out of service under the conditions of 5.2.6. Putting the gas rate adjuster(s) out of service under the conditions of 5.2.1 and 5.2.2, if applicable. The adjustments or component changes are only acceptable when converting from a gas of the first family to a gas of the second family or vice versa. 5.1.1.2.2 Categories of system designed for use with gases of the second and third families Adjustment of the gas rate with, if necessary, a change of injector, restrictor or regulator. Adjustment of the gas rate of the ignition burner, either by using an adjuster or by a change of injector or restrictor and if necessary, a change of the complete ignition burner or of some of its parts. Putting the regulator out of service under the conditions of 5.2.6. Putting the gas rate adjuster(s) out of service under the conditions given in 5.2.1 and 5.2.2 if applicable. The adjustments or component changes are only acceptable when: a) converting from a gas of the second family to a gas of the third family or vice versa; b) converting from one butane/propane pressure couple to another (e.g. 28-30/37 mbar to 50/67 mbar). 5.1.1.3 Category III Category III systems which are in use in certain countries are given in Annex A (see A.3.2.3). 5.1.2 Materials and method of construction The quality and thickness of materials used in the construction of a system including its POCED shall be: a) such that the construction and performance characteristics are not altered so as to affect the safe operation of the system in normal conditions of use and of maintenance by the user; b) such as to ensure a reasonable operating life. In particular, when the system is installed according to the manufacturer’s instructions, all components shall withstand the mechanical, chemical and thermal conditions to which they may be subjected when...
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