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SYSTEMA S.p.A.AIRTIGHT GAS-FIRED RADIANT TUBES INFRANOTEIf heat recovery systems are provided downstream from the generator, the hole must be on the length of ductfor evacuating combustion products leaving the recovery systems; this is a metal fumes duct, not insulatedand located inside the environment (see fig. 57), which loses heat to the environment by both convection andradiation.COMBUSTIONANALYSERSampling point located onthe flexible fumes elementFlexible fumeselementFig.57 Sampling hole for combustion analysis with heat recovery devices (point B)If the concentration of CO brought back to the condition of dry combustion products and without air is greater than 0.1%(1000 ppm) and it is not possible for the operator or the maintenance technician to reduce it below this value, the outcomeof combustion control must be considered negative, irrespective of the measured value of combustion performance.9.2.1 Measuring the temperature of the combustion airThis must be done at a suitable point of the combustion air feeding duct.At the end of measuring, the operator must close the hole securely, so as to guarantee the seal of the duct for evacuatingcombustion products during normal plant operation.Rev. 18GB061052
AIRTIGHT GAS-FIRED RADIANT TUBES INFRA10 MAINTENANCESYSTEMA S.p.A.Remember to have the appliances checked yearly by professionally qualified personnel.10.1 Changing the fuelChanging of the fuel must be carried out by professionally skilled personnel, responsible for respecting thesafety regulations in force; the manufacturer declines all responsibility for any damage deriving from incorrecttransformation or from improper and/or incorrect use of the appliance.10.1.1 Transformation from Natural gas to LPG1) Turn off the gas supply and switch off the electric power supply.2) Disconnect the combustion torch from the electrovalve (30 mm spanner).3) Unscrew the nozzle (with a straight slotted head) from the inside of the torch, taking care not to spoil the electrodes(for ignition and flame detection) located on the head of the torch and the respective cables.4) Replace it with the nozzle in the transformation kit, after having checked that the diameter is the same as the onelisted on the plate data.5) Connect the torch to the electrovalve and screw it on firmly.6) Regulate the pressure on the burner by means of the electrovalve pressure regulator, turning the screw (point 3fig. 55).7) Start the appliance and check that the burner feeding pressure (point 2 fig. 55) is the same as the plate values.8) Check the gas seal on the threaded joints.9) Mark on the data plate placed on the appliance that the gas type has been changed.IMPORTANT: please seal the adjustment device of the gas valve after completing adjustment.10.1.2 Transformation from LPG to Natural gas1) Proceed as in points 1), 2), 3), and 4).5) Regulate the pressure on the burner by means of the electrovalve pressure regulator, turning the screw (point 3fig. 55).6) Start the appliance and check that the burner feeding pressure (point 2 fig. 55) is the same as the plate values.7) Mark on the data plate placed on the appliance that the gas type has been changed.IMPORTANT: please seal the adjustment device of the gas valve after completing adjustment.53Rev. 18GB0610
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