NTI Tft60 - 399 Installation And Operation Instructions Manual

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NTI Tft60 - 399 Installation And Operation Instructions Manual Manual pdf 33 page image

Tft Series Installation and Operation Instructions │Trinity339.0 GAS VALVE AND BURNER SET-UPSet-up of the Trinity Tft gas valve must be performed by a licensed Gas Technician.Failure to perform the set-up correctly may result in incorrect operation, componentfailure, property damage, serious injury or death.Gas Line PressureThe boiler gas valve is equipped with a line pressure test port; see Figures 9-1 and 9-2. Use the followingprocedure to measure the gas line pressure to the boiler to ensure it falls within the range given in Table 9-1:1. Turn the supply of gas to the boiler off.2. Open the bleed screw of the line pressure test port approximately 1-1/2 turns. This port is directlyconnected to the gas line feeding the boiler. See Figures 9-1 and 9-2.3. Force 1/4 ID tubing over the housing of the line pressure test port; install the other end of the tubing to anappropriate line pressure test gauge or 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. Ifpossible adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1, while the unit isoperating 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. Complete pressure testing, and then return the bleed screw of the Line Pressure Test Port to the closedposition.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 close the bleed screw of the Line Pressure Test Port will cause a severe leakageof gas, resulting in a fire or explosion causing property damage, serious injury or death.Table 9-1 Line Pressure and Combustion ParametersGas Line Pressure (inches wc) CO2 (%)* CO (ppm)Max.*Nominal/Desired Min. Max. Min. Max.Natural 7 4 10.5 8.7 9.7 175Propane 11 8 13 10.5 11.5 175*Note: Observe the combustion products with the burner operating at the maximum modulation rate.Table 9-2 Minimum and Maximum Modulation RatesModel Min. Modulation Rate (RPM) Max. Modulation Rate (RPM)Tft60 1525 (1700 on LP) 4650Tft85 1525 (1700 on LP) 6300Tft110 1625 (2150 on LP) 7000Tft155 900 3700Tft175 900 4100Tft200 900 4650Tft250 900 5900Tft300 1500 5000 (4800 on LP)Tft399 1500 6900 (6600 on LP)