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.
7.3.3.3.1 Test I
This test is carried out if, when the appliance is installed in accordance with the manufacturer’s instructions, any part of the POCED is capable of being less than 25 mm from combustible parts of the fabric of the building.
Install the appliance in accordance with 7.1.6.3 and attach thermocouples junctions to the external surface of those parts of the POCED that are capable of being less than 25 mm from combustible parts of the fabric of the building. Thermocouples shall be used in accordance with EN 60584-1:1995 with the limits of accuracy of the thermoelectric voltage used in accordance with Class 2 of
EN 60584-2:1993.
The appliance is supplied with one of the reference gases indicated in 7.1.1 according to its category and adjusted in accordance with 7.1.3.2.1.
The test is carried out with the appliance operating at its nominal heat input. All measurements are taken when thermal equilibrium has been reached. It is recommended that for this test the appliance should be placed in a room where the ambient temperature is approximately 20 C.
At the end of the test, check that the maximum temperature rise of the POCED does not exceed the limit specified in 6.3.3.
7.3.3.3.2 Test 2
This test is carried out if, in accordance with the manufacturer’s installation instructions, the POCED is required to be enclosed within another duct, a sleeve or insulation when it passes through a combustible wall or ceiling.
Install the appliance in accordance with 7.1.6.3. The duct, sleeve or insulation enclosing the POCED shall be fitted in accordance with the manufacturer’s instructions. This duct, sleeve or insulation shall be so dimensioned and arranged that it encloses a section of the POCED that is 350 mm in length, as close to the appliance as the manufacturer’s instructions allow.
Attach thermocouples junctions to the external surface of the duct, sleeve or insulation and then enclose the duct, sleeve or insulation with a 25 mm thick layer of insulation. Thermocouples shall be used in accordance with EN 60584-1:1995 with the limits of accuracy of the thermoelectric voltage used in accordance with Class 2 of EN 60584-2:1993,
The appliance is supplied with one of the reference gases indicated in 7.1.1 according to its category and adjusted in accordance with 7.1.3.2.1.
The test is carried out with the appliance operating at its nominal heat input. All measurements are taken when thermal equilibrium has been reached. It is recommended that for this test the appliance should be placed in a room where the ambient temperature is approximately 20 °C.
At the end of the test, check that the maximum temperature rise at the external surface of the duct, sleeve or insulation enclosing the POCED does not exceed the limit specified in 6.3.3.
7.3.4 Ignition, cross-lighting and flame stability
7.3.4.1 Ignition and cross-lighting
7.3.4.1.1 Tests with all gases
These tests are carried out both with the installation cold and with the installation at thermal equilibrium under still air conditions.
The installation is made as follows:
a) an installation intended to be fitted to a flue having a wall termination shall be connected In turn to a flue of the manufacturer’s minimum and maximum equivalent resistance:
b) an installation intended to be fitted to a vertical flue having a termination above roof level shall be connected in turn to a vertical flue of the manufacturer’s minimum and maximum equivalent resistance.
In addition, unless otherwise specified in the test, the tests are carried out with the damper in the branch tube set to give alternately the minimum and maximum suctions or pressures (corresponding to the minimum and maximum flow conditions) specified by the manufacturer or the branch tube.
The burner unit is Initially adjusted in accordance with 7.1.3.2.1 and the tests described in 7.3.4.1.1 C) to e) are carried out.BS EN 777-3-2009 pdf download.