NTI FTG 600 Installation And Operation Manual

Also see for FTG 1200: Conversion instructions

Contents

NTI FTG 600 Installation And Operation Manual Manual pdf 31 page image

FTG │Installation & Operation Manual319.0 GAS VALVE AND BURNER SET-UPSet-up of the FTG gas valve must be performed by a licensed Gas Technician. Failure toperform the set-up correctly may result in incorrect operation, component failure,property damage, serious injury or death.Gas Line PressureThe boiler gas valve is equipped with a line pressure test port; see Figure 9-1. Use the following procedure tomeasure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1:1. Turn the supply of gas to the boiler off.2. For models FTG 600-1400, use a 3/16 in. hex wrench to remove the plug from the inlet flange of the gasvalve, and install a 1/8 NPT x hose barb adapter suitable for connecting the tubing of the gas pressuremanometer being used to measure gas line pressure. Models FTG 2000-2400 encorporate a bleed screw onthe inlet flange of the gas valve, open it approximately 1-1/2 turns. See Line Pressure Test Port in Figures9-1(a) and 9-1(b).3. Slide the gas pressure manometer tubing over the hose bard adapter located on the inlet flange of the gasvalve (bleed screw fitting for models FTG 2000-2400); connect the other end of the tubing to the gaspressure manometer. Ensure both ends of the tubing make a tight connection.4. Open the supply of gas to the boiler and check for gas leaks.5. Observe the line pressure under static conditions and compare it to Table 9-1. The pressure will be greatestunder static conditions.6. With all other gas appliances in the application running, operate the burner to the maximum firing rate (seeTable 9-2) and compare the observed line pressure with Table 9-1. The pressure will be lowest during themaximum flow of gas.7. Adjust the gas line pressure to ensure the parameters in Table 9-1 are attained under all conditions (seeNOTICE below). If possible, adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1,while the unit is operating at the maximum modulation rate, see Table 9-2.8. Continue observing the gas line pressure until the completion of the combustion analyses, in caseadjustments need to be made.9. Upon completion of the line pressure testing, turn the gas supply off, and then reinstall the Line PressureTest Port plug, applying appropriate thread sealant to the threads prior to installing. For models FTG 2000-2400, close the bleed screw. Turn gas on and check for leaks.The line pressure is a function of the gas supply and is affected solely by field providedparameters such as line size and regulator settings. Under no circumstances can the boilergas valve influence or be used to adjust the gas line pressure.Failure to properly re-install the Line Pressure Test Port plug (FTG 600-1400), or closethe Line Pressure Test Port bleed screw (FTG 2000-2400) will cause severe leakage ofgas, resulting in a fire or explosion causing property damage, serious injury or death.Table 9-1 Line Pressure and Combustion ParametersGasLine Pressure (inches w.c.) Offset Pressure(inches w.c. / [Pa]) 4CO2 (%) 1,2,3Max. CO(ppm)Nominal/Desired Min. Max. Min. Max.Natural 7 4 10.5 -0.01 to 0 / [-3 to -1] 8.7 9.5 175Propane 11 8 13 -0.04 to -0.03 / [-10 to -8] 10 10.8 175Notes:1 Combustion calibration must only be performed with the burner operating at maximum modulation rate.2 Combustion values listed are for burner operation at maximum modulation rate; CO2 and CO values will be lower atminimum modulation rate.3 When tested at minimum modulation rate, the CO2 must be 0.5-1.0% lower than CO2 at maximum modulation rate.4 The Offset Pressure for models FTG 2000-2400 converted to Propane, must be checked, and if necessary adjusted, inaccordance with the procedure detailed in Figure 9-2.