BS EN 777-3:2009 pdf download.Multi-burner gas-fired overhead radiant tube heater systems for nondomestic use Part 3: System F - Safety。
3.5.2
cold condition
condition of the installation required for some tests and obtained by allowing the unhit burner unit to attain thermal equilibrium at room temperature
3.5.3
hot condition
condition of the installation required for some tests and obtained by heating to thermal equilibrium at the nominal heat input
3.5.4
equivalent resistance
resistance to flow in millibar, measured at the outlet of the system, which is equivalent to that of the actual flue
3.5.5
thermal equilibrium
operating state of the system corresponding to a particular setting of the input in which the flue gas temperature does not change by more than ± 2 % (in °C) over a period of 10 mm
3.6 Country of destination
3.6.1
direct country of destination
country for which the system has been certified and which is specified by the manufacturer as the intended country of destination. At the time of putting the system on the mariet and/or installation, the system shall be capable of operating, without adjustment or modification, with one of the gases distributed in the country concerned, at the appropriate supply pressure
More than one country can be specified if the system, in its current state of adjustment, can be used in each of these countries.
3.6.2
indirect country of destination
country for which the system has been certified, but for which, in its present state of adjustment, it is not suitable. Subsequent modification or adjustment shall be made in order that it can be utilized safely and correctly in this country.
cold condition
condition of the installation required for some tests and obtained by allowing the unhit burner unit to attain thermal equilibrium at room temperature
3.5.3
hot condition
condition of the installation required for some tests and obtained by heating to thermal equilibrium at the nominal heat input
3.5.4
equivalent resistance
resistance to flow in millibar, measured at the outlet of the system, which is equivalent to that of the actual flue
3.5.5
thermal equilibrium
operating state of the system corresponding to a particular setting of the input in which the flue gas temperature does not change by more than ± 2 % (in °C) over a period of 10 mm
3.6 Country of destination
3.6.1
direct country of destination
country for which the system has been certified and which is specified by the manufacturer as the intended country of destination. At the time of putting the system on the mariet and/or installation, the system shall be capable of operating, without adjustment or modification, with one of the gases distributed in the country concerned, at the appropriate supply pressure
More than one country can be specified if the system, in its current state of adjustment, can be used in each of these countries.
3.6.2
indirect country of destination
country for which the system has been certified, but for which, in its present state of adjustment, it is not suitable. Subsequent modification or adjustment shall be made in order that it can be utilized safely and correctly in this country.
