Eternal GU125T, Installation And Operation Manual

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Gas Supply Piping
When measuring the inlet supply pressure, the water heater and all other gas appliances sharing the gas supply
line must be
 ring at maximum capacity.
Maximum gas pressure must not exceed listed value.
Low gas pressure could be caused by an undersized gas pipe; this will cause the water heater's performance to
diminish and it would not be able to reach maximum performance.
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Size gas piping system correctly by following ANSI Z223.1/NFPA 54, or by local code.
Based on 0.60 specific gravity for natural gas at 0.5" W.C. pressure drop DOE standard is 1000 BTU per cubic ft. of natural gas
Based on 0.60 specific gravity for natural gas at 3.0" W.C. pressure drop; 8.0" W.C. or greater supply pressure . DOE standard
is 1000 BTU per cubic ft. of natural gas
Gas Piping System Codes
NATURAL GAS SUPPLY PIPING
NATURAL GAS SUPPLY PIPING
A manual gas control valve (shut-off valve) must be connected to the unit before the gas line.
Check the gas inlet pressure and make sure the type of gas matches matching the rating plate located on
your water heater. Also, check to make sure your gas meter is capable of supplying suf
 cient BTU load to all
appliances. Insuf  cient gas pressure and volume will cause your water heater to be de  cient in performance
and may not work properly.
When connections are completed, check for gas leaks by applying soapy water to all gas fittings and
connections. Presence of soap bubbles foaming is a sign of gas
leak.
This appliance and its individual shut-off valve must be isolated from the gas supply piping system by
unplugging the unit and turning off the main gas valve during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSI.
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NOTICE
! !
Pipe
Cubic Feet of Natural Gas
size
Length 10 ’ 20 ’ 30 ’ 40 ’ 50 ’ 60 ’ 70 ’ 80 ’ 90 ’ 100 ’ 125 ’ 150 ’ 200 ’
1/2" 172 118 95 81 72 65 60 56 52 50 44 40 34
3/4" 360 247 199 170 151 137 126 117 110 104 92 83 71
1" 678 466 374 320 284 257 237 220 207 195 173 157 134
1 1/4" 1390 967 768 657 583 528 486 452 424 400 355 322 275
1 1/2" 2090 1430 1150 985 873 791 728 677 635 600 532 482 412
2" 4020 2760 2220 1900 1680 1520 1400 1300 1220 1160 1020 928 794
Pipe
Cubic Feet of Natural Gas
size
Length 10 ’ 20 ’ 30 ’ 40 ’ 50 ’ 60 ’ 70 ’ 80 ’ 90 ’ 100 ’ 125 ’ 150 ’ 200 ’
1/2" 454 312 250 214 190 172 158 147 138 131 116 105 90
3/4" 949 552 524 448 397 360 331 308 280 273 242 219 188
1" 1787 1228 986 844 748 678 624 580 544 514 456 413 353
1 1/4" 3669 2522 2025 1733 1536 1392 1280 1191 1118 1056 936 848 726
1 1/2" 5497 3778 3034 2597 2302 2085 1919 1785 1675 1582 1402 1270 1087
2" 10588 7277 5844 5001 4433 4016 3695 3437 3225 3046 2700 2446 2094
Based on 1.50 specific gravity for propane gas at 0.5" W.C. pressure drop; 11" W.C. supply pressure
PROPANE GAS SUPPLY PIPING
Pipe
KBTU of Propane Gas
size
Length 10 ’ 20 ’ 30 ’ 40 ’ 50 ’ 60 ’ 80 ’ 100 ’ 125 ’ 150 ’ 175' 200 ’
1/2" 291 200 160 137 122 110 101 94 89 84 74 67
3/4" 608 418 336 287 255 231 212 197 185 175 155 140
1" 1150 787 632 541 480 434 400 372 349 330 292 265
1 1/4" 2350 1620 1300 1110 985 892 821 763 716 677 600 543
1 1/2" 3520 2420 1940 1660 1480 1340 1230 1140 1070 1010 899 814
2" 6790 4660 3750 3210 2840 2570 2370 2200 2070 1950 1730 1570