GAS CONNECTIONS and Gas Regulator
NOTE: The Aquastar 125 B”S” is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 5. Failure to install the gas regulator as shown in figure 5 will be a violation of CSA certification of the unit. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for (low inlet) pressure (less than 1/2 Psig or 15” W.C.) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.
GAS LINE SIZING
FOR NATURAL GAS
Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column.
(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
Follow boxed numbers for piping just one Aquastar 125BS (example: 3/4” B.I. Natural Gas pipe for 30 ft. will handle 152,000 btu’s). For multiple appliances combine the total btu input load and then refer to applicable chart below.
Nominal |
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Iron |
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Pipe | Internal |
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Size, | Diameter |
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inches | inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 200 |
| 1/4 | 0.364 |
| 3/8 | 0.493 |
| 1/2 | 0.622 |
| 3/4 | 0.824 |
| 1 | 1.049 |
1 | 1/4 | 1.380 |
1 | 1/2 | 1.610 |
| 2 | 2.067 |
2 | 1/2 | 2.469 |
33.068
44.026
32 | 22 | 18 | 15 |
72 | 49 | 40 | 34 |
132 | 92 | 73 | 63 |
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278 | 190 | 152 | 130 |
520 | 350 | 285 | 245 |
1050 730 590 500
1600 1100 890 760
3050 2100 1650 1450
4800 3300 2700 2300
8500 5900 4700 4100
17,500 12,000 9,700 8,300
14 | 12 | 11 | 11 | 10 | 9 | 8 | 8 | 7 | 6 |
30 | 27 | 25 | 23 | 22 | 21 | 18 | 17 | 15 | 14 |
56 | 50 | 46 | 43 | 40 | 38 | 34 | 31 | 28 | 26 |
115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55 |
215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100 |
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440 | 400 | 370 | 350 | 320 | 305 | 275 | 250 | 225 | 210 |
670 | 610 | 560 | 530 | 490 | 460 | 410 | 380 | 350 | 320 |
1270 | 1150 | 1050 | 990 | 930 | 870 | 780 | 710 | 650 | 610 |
2000 | 1850 | 1700 | 1600 | 1500 | 1400 | 1250 | 1130 | 1050 | 980 |
3600 | 3250 | 3000 | 2800 | 2600 | 2500 | 2200 | 2000 | 1850 | 1700 |
7,400 | 6,80 | 6,200 | 5,800 | 5,400 | 5,100 | 4,500 | 4,100 | 3,800 | 3500 |
FOR LP GAS
Maximum Capacity of Pipe in Thousands of BTU per Hour of Undiluted Petroleum Gases (at 11 inches Water Column Inlet Pressure) (Based on a Pressure Drop of 0.5 Inch Wa- ter Column).
Fig. 4
Nominal |
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Iron Pipe |
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Size, |
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| Length of Pipe, Feet |
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Inches | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 |
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| 1/2 |
| 275 | 189 | 152 | 129 | 114 | 103 | 96 | 89 | 83 | 78 | 69 | 63 |
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| 3/4 | 567 | 693 | 315 | 267 | 237 | 217 | 196 | 185 | 173 | 162 | 146 | 132 |
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1 | 107 | 732 | 590 | 504 | 448 | 409 | 378 | 346 | 322 | 307 | 275 | 252 |
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1 1/4 | 220 | 149 | 121 | 103 | 913 | 834 | 771 | 724 | 677 | 630 | 567 | 511 |
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1 1/2 | 330 | 229 | 185 | 155 | 141 | 127 | 118 | 108 | 102 | 976 | 866 | 787 |
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2 | 622 | 433 | 346 | 299 | 264 | 239 | 220 | 204 | 192 | 1811 | 1606 | 1496 |
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Maximum Capacity of
Tubing in Thousands of BTU per Hour of Undiluted Liquified Petroleum Gases (at 11 inches Water Column Inlet Pressure)
(Based on a Pressure Drop of 0.5 Inch Water Column)
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Outside |
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Diameter, |
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Inch | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
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3/8 | 39 | 26 | 21 | 19 | _ | _ | _ | _ | _ | _ |
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1/2 | 92 | 62 | 50 | 41 | 37 | 35 | 31 | 29 | 27 | 26 |
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| 5/8 |
| 199 | 131 | 107 | 90 | 79 | 72 | 67 | 62 | 59 | 55 |
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| 3/4 | 329 | 216 |
| 181 | 145 | 131 | 121 | 112 | 104 | 95 | 90 |
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| 7/8 | 501 | 346 | 277 | 233 | 198 | 187 | 164 | 155 | 146 | 138 |
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*Source National Fuel Gas Code NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings
10 | 6 720 606 518 |