Gas Piping |
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| 4 − | The piping should be sloped 1/4 inch (6.4 mm) per 15 | |||||||||
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| feet (4.57 m) upward toward the meter from the fur- | ||||||||||
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| nace. The piping must be supported at proper intervals | |||||||
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| CAUTION |
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| [every 8 to 10 feet (2.44 to 3.01 m)] with suitable hang- | |||||||||
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| ers or straps. Install a drip leg in vertical pipe runs to the | ||||||||||
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If a flexible gas connector is required or allowed by |
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the authority that has jurisdiction, black iron pipe |
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| 5 − | A 1/8" N.P.T. plugged tap or pressure post | is located | ||||||||||||
shall be installed at the gas valve and extend outside |
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| on the gas valve to facilitate test gauge connection. | ||||||||||||||
the furnace cabinet. The flexible connector can then |
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| See figures 35 and 36. |
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be added between the black iron pipe and the gas |
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| 6 − In some localities, codes may require the installation of | |||||||||||||||
supply line. |
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| a manual main | |||||||
Gas Supply |
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| the installer) external to the unit. The union must be of | ||||||||||
1 − This unit is shipped standard for left or right side instal- |
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| the ground joint type. |
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| lation of gas piping (or top entry in horizontal applica- |
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| IMPORTANT |
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| tions). Connect the gas supply to the piping assembly. |
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2 − | When connecting the gas supply piping, consider fac- |
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| Compounds used on threaded joints of gas piping | ||||||||||||||||
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| tors such as length of run, number of fittings, and fur- |
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| must be resistant to the actions of liquified petro- | |||||||||||||||
| nace rating to avoid excessive pressure drop. Table 9 |
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| leum gases. |
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| lists recommended pipe sizes for typical applications. |
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| NOTE − If emergency shutoff is necessary, shut off the main | ||||||||||||||||
3 − | The gas piping must not run in or through air ducts, |
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| clothes chutes, gas vents or chimneys, dumb waiters, |
| manual gas valve and disconnect main power to the fur- | |||||||||||||||
| or elevator shafts. |
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| nace. The installer should properly label these devices. | ||||||||||
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| TABLE 9 |
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| Gas Pipe Capacity − ft3/hr (m3/hr) |
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Nominal | Internal |
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| Length of Pipe − feet (m) |
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Iron Pipe |
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Diameter |
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| Size |
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| inches | 10 | 20 | 30 | 40 |
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| 70 | 80 | 90 | 100 | ||
inches |
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(mm) | (3.048) | (6.096) | (9.144) | (12.192) |
| (15.240) |
| (18.288) |
| (21.336) | (24.384) | (27.432) | (30.480) | |||||
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| 1/2 | .622 | 175 | 120 | 97 | 82 |
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| 73 |
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| 61 | 57 | 53 | 50 | |
| (12.7) | (17.799) | (4.96) | (3.40) | (2.75) | (2.32) |
| (2.07) |
| (1.87) |
| (1.73) | (1.61) | (1.50) | (1.42) | |||
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| 3/4 | .824 | 360 | 250 | 200 | 170 |
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| 138 |
| 125 | 118 | 110 | 103 | ||
(19.05) | (20.930) | (10.19) | (7.08) | (5.66) | (4.81) |
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| (3.91) |
| (3.54) | (3.34) | (3.11) | (2.92) | ||||
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| 1 | 1.049 | 680 | 465 | 375 | 320 |
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| 260 |
| 240 | 220 | 205 | 195 | ||
| (25.4) | (26.645) | (919.25) | (13.17) | (10.62) | (9.06) |
| (8.07) |
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| (6.80) | (6.23) | (5.80) | (5.52) | |||
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| 1−1/4 | 1.380 | 1400 | 950 | 770 | 660 |
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| 530 |
| 490 | 460 | 430 | 400 | ||
(31.75) | (35.052) | (39.64) | (26.90) | (21.80) | (18.69) |
| (16.42) |
| (15.01) |
| (13.87) | (13.03) | (12.18) | (11.33) | ||||
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| 1−1/2 | 1.610 | 2100 | 460 | 1180 | 990 |
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| 900 |
| 810 |
| 750 | 690 | 650 | 620 | ||
| (38.1) | (40.894) | (59.46) | (41.34) | (33.41) | (28.03) |
| (25.48) |
| (22.94) |
| (21.24) | (19.54) | (18.41) | (17.56) | |||
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| 2 | 2.067 | 3950 | 2750 | 2200 | 1900 |
| 1680 |
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| 1400 | 1300 | 1220 | 1150 | |||
| (50.8) | (52.502) | (111.85) | (77.87) | (62.30) | (53.80) |
| (47.57) |
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| (39.64) | (36.81) | (34.55) | (32.56) | |||
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| 2−1/2 | 2.469 | 6300 | 4350 | 3520 | 3000 |
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| 2250 | 2050 | 1950 | 1850 | |||
| (63.5) | (67.713) | (178.39) | (123.17) | (99.67) | (84.95 |
| (75.04) |
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| (63.71) | (58.05) | (55.22) | (52.38) | |||
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| 3 | 3.068 | 11000 | 7700 | 6250 | 5300 |
| 4750 |
| 4300 |
| 3900 | 3700 | 3450 | 3250 | |||
| (76.2) | (77.927) | (311.48) | (218.03) | (176.98) | (150.07) |
| (134.50) |
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| (110.43) | (104.77) | (97.69) | (92.03) | |||
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NOTE − Capacity given in cubic feet (m3 ) of gas per hour and based on 0.60 specific gravity gas.
Page 23
