A.O. Smith BTH 300, Instruction Manual

Page: 39 / 76

39
SUPPLY GAS LINE INSTALLATION
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Fire and Explosion Hazard
Turn off gas lines during installation.
Contact a qualified installer or service
agency for installation and service.
Excessive gas pressure to gas valve can
cause serious injury or death.
Do not use water heater with any gas
other than the gas shown on the rating
label.
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REGULATED GAS
SUPPLY LINE
MAIN GAS
SHUTOFF VALVE
TEE FITTING
PIPE CAP
SEDIMENT TRAP
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GAS LINE SIZING
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SUPPLY GAS LINE SIZING U. S. UNITS
TABLE 13
LENGTH
IN
FEET
1250$/,5213,3(6,=(6,1&+(6
,1387,17+286$1'6%78+5
´ ´ ´ ´ ´ ´
10 1400 2100 3960 6300 11000 23000
20 950 1460 2750 4360 7700 15800
30 770 1180 2200 3520 6250 12800
40 660 990 1900 3000 5300 10900
50 580 900 1680 2650 4750 9700
60 530 810 1520 2400 4300 8800
70 490 750 1400 2250 3900 8100
80 460 690 1300 2050 3700 7500
90 430 650 1220 1950 3450 7200
100 400 620 1150 1850 3250 6700
125 360 550 1020 1650 2950 6000
150 325 500 950 1500 2650 5500
175 300 460 850 1370 2450 5000
200 N/A 430 800 1280 2280 4600
SUPPLY GAS LINE SIZING METRIC UNITS
TABLE 14
LENGTH
IN
0(7(56
1250$/,5213,3(6,=(6,1&+(6
,1387,1
kW
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410 615 1160 1845 3221 6735
278 428 805 1277 2255 4626
225 346 644 1031 1830 3748
193 290 556 878 1552 3192
170 264 492 776 1391 2840
155 237 445 703 1259 2577
143 220 410 659 1142 2372
135 202 381 600 1083 2196
126 190 357 571 1010 2108
117 182 337 542 952 1962
105 161 299 483 864 1757
95 146 278 439 776 1610
88 135 249 401 717 1464
N/A 126 234 375 688 1347