Eternal GU145 Series, Installation And Operation Manual

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Gas Supply Piping
This unit needs a manual gas control valve (shut-off valve) that must be connected to the unit before the gas
line.
Check the gas inlet pressure and the type of gas 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 deficient 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 leaks.
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.
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 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 1100 BTU per cubic ft. of natural gas
Based on 11 "W.C. supply pressure
Gas Piping System Codes
NATURAL GAS SUPPLY PIPING
PROPANE GAS SUPPLY PIPING
Recommended Gas Pipe Size
( Diameter, for Natural Gas)
Distance from gas meter Pipe size(inches)
0 ft. to 20 ft. 3/4 inch
20 ft. to 60 ft. 1 inch
60 ft. to 100 ft. 1-1/4 inch
Pipe
Cubic Feet of Natural Gas
size
Length 10 ’ 20 ’ 30 ’ 40 ’ 50 ’ 60 ’ 70 ’ 80 ’ 90 ’ 100 ’ 125 ’ 150 ’ 200 ’
1/2" 174 119 96 82 73 66 61 56 53 50 44 40 34
3/4" 363 249 200 171 152 138 127 118 111 104 93 84 72
1" 684 470 377 323 286 259 239 222 208 197 174 158 135
1 1/4" 1404 965 775 663 588 532 490 456 428 404 358 324 278
1 1/2" 2103 1445 1161 993 880 798 734 683 641 605 536 486 416
2" 4050 2784 2235 1913 1696 1536 1413 1315 1234 1165 1033 936 801
Pipe
KBTU of Propane Gas
size
Length 10 ’ 20 ’ 30 ’ 40 ’ 50 ’ 60 ’ 70 ’ 80 ’ 90 ’ 100 ’ 125 ’ 150 ’ 200 ’
1/2" 276 190 153 130 115 104 97 90 84 79 70 64 56
3/4" 568 394 316 268 238 218 197 186 174 163 147 133 112
1" 1072 733 591 505 449 410 379 347 323 308 276 253 213
1 1/4" 2206 1497 1213 1040 914 835 772 725 678 631 567 511 440
1 1/2" 3308 2300 1859 1560 1418 1276 1182 1087 1024 977 867 788 676
2" 6222 4332 3466 2993 2647 2395 2206 2048 1922 1812 1607 1496 1260
NOTICE
! !