OWNER’S MANUAL
INSTALLATION
(Continued)
Providing Gas Piping to Furnace
You must provide gas piping from gas source to furnace. The gas piping must be in a vertical position where it connects to the furnace. This prevents interference with front cover installation.
Consult your local gas company for proper routing of the gas lines.
Pipe size is determined by the length of pipe from the gas source to the furnace and the total
BTU load on the gas source.
Add the total BTUs required for all appliances connected to the gas source including this furnace.
Divide this number by 1030. This will give you the approximate cubic feet per hour needed.
Example:
40,000 BTU/Hr
+15,000 BTU/Hr for other gas appliances
55,000 BTU/Hr total
55,000 ÷ 1030 = 53.4
Locate 53.4 or higher on chart below.
According to the chart below, you should use 50 feet or less of 1/2" pipe, 200 feet or less of 3/4" pipe, etc...
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IRON PIPE |
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SIZE |
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| LENGTH OF PIPE (FEET) |
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| 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 | 200 |
3/8" | 72 | 49 | 40 | 34 | 30 | 27 | 25 | 23 | 22 | 21 | 18 | 17 | 15 | 14 |
1/2" | 132 | 92 | 73 | 63 | 56 | 50 | 46 | 43 | 40 | 38 | 34 | 31 | 28 | 26 |
3/4" | 278 | 190 | 152 | 130 | 115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55 |
1" | 520 | 350 | 285 | 245 | 215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100 |
11/4" | 1050 | 730 | 590 | 500 | 440 | 400 | 370 | 350 | 320 | 305 | 275 | 250 | 225 | 210 |
11/2" | 1600 | 1100 | 890 | 760 | 670 | 610 | 560 | 530 | 490 | 460 | 410 | 380 | 350 | 320 |
2" | 3050 | 2100 | 1650 | 1450 | 1270 | 1150 | 1050 | 990 | 930 | 870 | 780 | 710 | 650 | 610 |
21/2" | 4800 | 3300 | 2700 | 2300 | 2000 | 1850 | 1700 | 1600 | 1500 | 1400 | 1250 | 1130 | 1050 | 980 |
3" | 8500 | 5900 | 4700 | 4100 | 3600 | 3250 | 3000 | 2800 | 2600 | 2500 | 2200 | 2000 | 1850 | 1700 |
4" | 17500 | 12000 | 9700 | 8300 | 7400 | 6800 | 6200 | 5800 | 5400 | 5100 | 4500 | 4100 | 3800 | 3500 |
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IMPORTANT: Check gas line pressure at gas meter before connecting furnace to gas line. Gas line pressure must be no less than 5 inches of water and no greater than 7 inches of water. Gas pressures and input to the burners must not exceed the rated input and pressure shown on the rating plate. For natural gas, manifold pressure should be 3.5 inches of water. For elevations above 2000 feet, reduce rating 4% for each 1000 feet above sea level (U.S.A. only).
Continued
201835 | 9 |
