Installation manual
Sizing Gas Supply Line
Capacity of Piping
Cubic Feet per Hour based on 0.3" w.c. Pressure Drop
Specic Gravity for Natural Gas -- 0.6 (Natural Gas -- 1000 BTU/Cubic Ft)
Specic Gravity for Propane Gas -- 1.6 (Propane Gas -- 2550 BTU/Cubic Ft)
Length
Diameter of Pipe
of
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
Pipe
Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane Natural Propane
20' 92 56 190 116 350 214 730 445 1100 671 2100 1281
30' 73 45 152 93 285 174 590 360 890 543 1650 1007
40' 63 38 130 79 245 149 500 305 760 464 1450 885
50' 56 34 115 70 215 131 440 268 670 409 1270 775
60' 50 31 105 64 195 119 400 244 610 372 1105 674
70' 46 28 96 59 180 110 370 226 560 342 1050 641
80' 43 26 90 55 170 104 350 214 530 323 990 604
90' 40 24 84 51 160 98 320 195 490 299 930 567
100' 38 23 79 48 150 92 305 186 460 281 870 531
125' 34 21 72 44 130 79 275 168 410 250 780 476
150' 31 19 64 39 120 73 250 153 380 232 710 433
175' 28 17 59 36 110 67 225 137 350 214 650 397
200' 26 16 55 34 100 61 210 128 320 195 610 372
Note: When sizing supply lines, consider possibilities of future expansion and increased requirements.
Refer to National Fuel Gas Code for additional information on line sizing.
FIGURE 5 - Gas
connection is at the
pipe nipple that extends
outside the cabinet
Illustration shows
both a vertical and
horizontal gas supply;
requirements are the
same.
7.1.2 Gas Connection
Leak-test all connections by brushing on a leak-detecting solution.
WARNING
All components of a gas supply system must be leak
tested prior to placing equipment in service. NEVER TEST
FOR LEAKS WITH AN OPEN FLAME. Failure to comply
could result in personal injury, property damage or death.
Gas Connection
Size
inches
130, 180 1/2
260, 310
3/4
Install a ground joint union and a manual shutoff valve upstream of the unit control
system as shown in FIGURE 5. Installation of a trap with a minimum 3” (76mm)
drip leg is required. he unit is equipped with a nipple that extends outside the cabi-
net. The gas connection is either 1/2” or 3/4”.
Form I-UEAS, P/N 221232 R11, Page 9