NTI FTV110 Installation And Operation Manual

Also see for FTV110: Instructions

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NTI FTV110 Installation And Operation Manual Manual pdf 34 page image

Gas Valve and Burner Set-up │ FTV I&O Manual349.0 GAS VALVE AND BURNER SET-UPSet-up of the FTV 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. Open the bleed screw of the line pressure test port approximately 1-1/2 turns. This port is directly connectedto the gas line feeding the boiler. See Figure 9-1.3. Force ¼ in. 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 ParametersGas Line Pressure (inches w.c.) CO2 (%) CO (ppm)Max.Nominal/Desired Min. Max. Min. Max.Natural 7 4 10.5 9 10 175Propane 11 8 13 10 11 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 at minimummodulation rate.3 When tested at minimum modulation rate, the CO2 must be 0.5-1.0% lower than CO2 at maximum modulation rate.Table 9-2 Minimum and Maximum Modulation RatesModel Gas ApplianceNumberMin. Modulation Rate(RPM)Max. Modulation Rate(RPM)Input Rate (MBH)Min Max *FTV110 NG 16 1620 762011 110LP 22 1860 8040FTV110C NG 19 1620 7620LP 23 1860 8040FTV150 NG/LP 17 1740 8220 15 150FTV150C NG/LP 20FTV190 NG/LP 18 1620 8280 19 190FTV190C NG/LP 21* Canada: Altitudes between 2000-4500 ft, de-rate by 10%. Consult local authorities for de-rating for altitudes above 4500ft.