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INSTALLATION--CONTINUED <br /> Piping Connections—Continued <br /> Gas Supply Piping—Continued <br /> Table 14. Gas Supply Line Sizes <br /> Diameter of Pipe inches <br /> Length 1/2 314 1 1 1-1/4 1-1/2 2 <br /> of Pipe Natural Natural Natural Natural Natural Natural <br /> Propane Propane Propane Propane Propane Propane <br /> (Feet) Gas Gas Gas Gas , Gas` Gas <br /> Cubic Feet per Hour` <br /> 20 92 56 190 116 350 214 730 445 1100 671 2100 1281 <br /> 30 73 45 152 93 285 174 590 360 890 543 1650 1007 <br /> 40 63 38 130 79 245 149 500 305 760 464 1450 885 <br /> 50 56 34 115 70 215 131 440 268 670 409 1270 775 <br /> 60 50 31 105 64 195 119 400 244 610 372 1105 674 <br /> 70 46 28 96 59 180 110 370 1 226 560 342 1 1050 641 <br /> 80 43 26 90 55 170 104 350 214 530 323 990 604 <br /> 90 40 24 84 51 160 98 320 195 490 299 930 567 <br /> 100 38 23 79 48 150 92 305 186 460 281 870 531 <br /> 125 34 21 72 44 130 79 275 168 1 410 250 780 476 <br /> 150 31 19 64 39 120 73 250 153 380 232 710 433 <br /> 175 28 17 59 36 110 67 1 225 137 350 1 214 1 650 397 <br /> 200 26 16 55 34 100 61 210 128 1 320 1 195 1 610 372 <br /> Supply Piping Connections <br /> • Install a ground joint union and manual shutoff valve upstream of the unit control system, as shown in Figure 9. <br /> • The 1/8-inch plugged tapping in the manual shutoff valve in Figure 9 provides connection for a supply line pressure <br /> test gauge. <br /> • The National Fuel Gas Code requires the installation of a trap with a minimum 3-inch drip leg(see Figure 9).Local <br /> codes may require a drip leg longer than 3 inches(typically 6 inches).To permit burner removal,this drip leg must <br /> extend beyond the edge of the heater. <br /> • Leak-test all connections by brushing on a leak-detecting solution. Bleed trapped air from gas lines as needed. <br /> • The gas connection is made at the pipe nipple that extends outside the cabinet, as shown in Figure 9. Gas <br /> connection sizes are listed in Table 15. <br /> Ground Joint Union <br /> To Gas Valve. F-Manual shutoff <br /> (inside the <br /> cabinet) <br /> Drip f From Gas Supply <br /> Leg (horizontal or vertical) <br /> i <br /> Pipe nipple extending <br /> outside the cabinet <br /> �–Manual shutoff <br /> To Gas Valve <br /> (inside the 'q- <br /> cabinet) f <br /> Ground Drip <br /> Joint Leg <br /> Union <br /> Figure 9. Gas Connections <br /> 20 i-UBX-UBZ-UDX-UDZ(04-21)1034344-0 <br />