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gas. 7) Components to assemble a drip leg. 8) Level. 9) Drill (if anchors are required). ROUGH-IN GAS SUPPLY 1) Determine location of heater. (See “Operation”, “Fresh Air”, and “Safety Instructions” for details. 2) Install at least a .” diameter gas supply line. (Gas supply can enter through bottom or back of heater). See Figure 1. 1-5/8” 13-1/16” 36” 8”8” 3” CLEARANCES FIGURE 1 Page 6 Page 7 SEE FOLLOWING CHARTS FROM NFPN54, ANSI Z223.1 TO DETERMINE PROPER GAS SUPPLY LINE SIZE REQUIRED TO SUPPORT TOTAL BTU REQUIREMENTS. NATURAL GAS Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig or Less and a Pressure Drop of 0.5 Inch Water Column. (Based on a 0.60 Specific Gravity Gas) NominalIron Pipe Internal Size, Diameter, Inches Inches 10 20 30 40 50 60 70 80 90 100 125 175 200 LENGTH OF PIPE, FEET 150 . 0.364 43 29 24 20 18 16 15 10 9 8 3/ 8 0.493 95 65 52 45 40 36 33 22 20 19 . 0.622 175 120 97 82 73 66 61 40 37 35 . 0.824 360 250 200 170 151 138 125 84 77 72 1 1.049 680 465 375 320 285 260 240 160 145 135 1-1/4 1.38 1400 950 770 660 580 530 490 325 300 280 1-1/2” 1.61 2100 1460 1180 990 900 810 750 500 460 430 2 2.067 3950 2750 2200 1900 1680 1520 1400 950 850 800 2-1/2 2.469 6300 4350 3520 3000 2650 2400 2250 1500 1370 1280 3 3.068 11000 7.7 6250 5300 4750 4300 3900 2650 2450 2280 4 4.026 23000 15800 12800 10900 9.7 8800 8100 5500 5000 4600 14 13 12 11 31 29 27 24 57 53 50 44 118 110 103 93 220 205 195 175 460 430 400 360 690 650 620 550 1300 1220 1150 1020 2050 1950 1850 1650 3700 3450 3250 2950 7500 7200 6700 6000 Pipe and T* ubing Selection 2658 First StageFeetFeet Total piping length = 84 feet (use table 4 @ 90 feet) Regulator Range From a to b, demand =200,000 + 38,000 +65,000+35,000= 338,000 BTU/hr. use 1” pipe.From b to c, demand = 38,000 + 65,000 + 35,000= 138,000 BTU/hr; use .” pipe or 7/8” tubing. From c to d, demand = 65,000 + 35,000 65,000 = 100,000 BTU/hr; use .” pipe or .” tubing. Water Second StageClothesFrom d to e, demand = 35,000 BTU/hr; use .” pipe or 5/8” tubing. Heater Regulator DryerFrom b to f, demand = 200,000 BTU/hr; use 1” pipe. 38,000 35,000 From c to g, demand = 38,000 BTU/hr; use .” pipe or 5/8” tubing. Total first stage piping length = 26 feet; first stage regulator setting is 10 PSIG (use Table 1 or 3, From d to h, demand = 65,000 BTU/hr; use .” pipe or .” tubing. @ 30 feet) Example 2. From aa to a, demand = 338,000 BTU/hr; use Determine the sizes of piping or tubing required for the two-stage L.P. tubing, or .” T plastic pipe. Gas installation shown. Total second stage piping length = 60 feet). *Information from - REGO From a to b, demand = 338,000 “LP GAS SERVICEMAN’S MANUAL” From b to c, demand = 138,000 SEE FOLLOWING FOR PIPE SIZING FOR PROPANE GAS. tubing.From c to d, demand tubing.From d to e, demand tubing.From b to From tubing. TABLE 1 – first stage pipe sizing PROPANE GAS 10 PSIG Inlet with a 1 PSIG Pressure Drop Maximum capacity of pipe or tubing, in thousands of BTU/hr. of L.P. Gas Size of PipeOr Copper Tubing, Inches LENGTH OF PIPE OR TUBING, FEET* 10 20 30 40 50 60 70 80 90 100 3/8 558 383 309 265 235 213 196 182 171 161 Copper . 1387 870 700 599 531 481 443 412 386 365 Tubing 5/8 2360 1622 1303 1115 988 896 824 767 719 679 (O.D.) . 3993 2475 2205 1887 1672 1515 1394 1297 1217 1149 . 3339 2295 1843 1577 1398 1267 1165 1084 1017 961 Pipe . 6982 4799 3854 3298 2923 2649 2437 2267 2127 2009 Size 1 13153 9040 7259 6213 5507 4989 4590 4270 4007 3785 1-1/4 27004 18560 14904 12756 11306 10244 9424 8767 8226 7770 1-1/2 40461 27809 22331 19113 16939 15348 14120 13136 12325 11642 2 77924 53556 43008 36809 32623 29559 27194 25299 23737 22422 125 150 175 200 225 250 275 300 350 400 3/8 142 130 118 111 104 9 0 8 9 8 9 8 2 7 6 Copper . 323 293 269 251 235 222 211 201 185 172 Tubing 5/8 601 546 502 467 438 414 393 375 345 321 (O.D.) . 1018 923 843 790 740 700 664 634 584 543 . 852 772 710 660 61...

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