NTI Trinity TX51 Installation And Operation Instructions Manual

NTI Trinity TX51 Installation And Operation Instructions Manual Manual pdf 34 page image

Gas Valve and Burner Set-up │ Tx I&O Manual349.0 GAS VALVE AND BURNER SET-UPSet-up of the Trinity Tx 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 & 9-2. Use the followingprocedure to measure 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. 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 & 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 (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. 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 ParametersGasLine Pressure (inches w.c.) CO2 (%)* CO(ppm)Max.*Nominal/Desired Min. Max. Min. Max.Natural 7 4 10.5 9.0 9.8 175Propane 11 8 13 10.0 10.8*Note: Observe the combustion products with the burner operating at the maximum modulation rate, CO2 and CO values willbe lower at minimum modulation rate.Table 9-2 Minimum and Maximum Modulation RatesModel Appliance Number Min. Modulation Rate (RPM) Max. Modulation Rate (RPM)Tx51 1 1380 5460Tx81 2 1260 5700Tx101 3 1260 5820Tx151 4 1380 6540Tx151C 5 1380 6540Tx200 6 1020 5280Tx200C 7 1020 5280Carbon Monoxide - Never leave the unit operating while producing Carbon Monoxide(CO) concentrations in excess of 175ppm. Failure to follow this warning may result inserious injury or death.