Trane GRAA Installation, Operation And Maintenance Manual page 23

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N N o o t t e e s s : :
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Figure 13. Example of Piping Layout for Determining Size
GAS METER
Table 3. Gas Pipe Size
Nominal
Pipe Size
1 1/4
1 1/2
2 1/2
MUA-SVX004B-EN
250 cfh is supplied from B to D, requiring 1 inch pipe.
100 cfh is supplied from D to E, requiring 3/4 inch pipe.
150 cfh is supplied from D to F, requiring 1 inch pipe.
• For SI calculations, refer to metric conversion chart in general safety section of this
manual.
• If more than one gas duct furnace is to be served by the same piping arrangement, the
total cu. ft./hr. input and length of pipe must be considered.
• If the gas duct furnace is to be fired with LP gas, consult local LP gas dealer for pipe
size information. Heater installation for use with propane (bottled) gas must be made
by a qualified LP gas dealer or installer. He will insure proper joint compounds are
used for making pipe connections; that air is purged from lines; that a thorough test is
made for leaks before operating heater; and that it is properly connected to propane
gas supply system.
Before any connection is made to an existing line supplying other gas appliances, contact the
local gas company to make certain that the existing line is of adequate size to handle the
combined load.
Check all connections with a soap solution before leaving job.
20 ft.
6.56 m.
20 ft.
6.56 m.
A
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
Iron Internal
Dia.
in. in. 10 20 30
(mm) (3.0) (6.1) (9.1)
1 2 / 0.622 175 120 97
(16) (4.96) (3.40) (2.75)
3 4 / 0.824 360 250 200
(21) (10.2) (7.08) (5.66)
1 1.049 680 465 375
(27) (19.3) (13.2) (10.6)
1.380 1400 950 770
(35) (39.6) (26.9) (21.8)
1.610 2100 1460 1180
(41) (59.5) (41.3) (33.4)
2 2.067 3950 2750 2200
(53) (112) (77.9) (62.3)
2.469 6300 4350 3520
(63) (178) (123) (99.7)
3 3.068 11000 7700 6250
(78) (311) (218) (177)
4 4.026 23000 15800 12800
(102) (651) (447) (362)
HEATER(S)
200 CFH
C
5 ft.
1.64 m.
10 ft.
3.48 m.
D
B
5 ft.
1.64 m.
F
HEATER(S)
150 CFH
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 Specifi c Gravity Gas)
Length of Pipe, ft. (Meters)
40 50 60 70
(12.2) (15.2) (18.3) (21.3)
82 73 66 61
(2.32) (2.07) (1.87) (1.73)
170 151 138 125
(4.81) (4.28) (3.91) (3.54)
320 285 260 240
(9.06) (8.07) (7.36) (6.80)
660 580 530 490
(18.7) (16.4) (15.0) (13.9)
990 900 810 750
(28.0) (25.5) (22.9) (21.2)
1900 1680 1520 1400
(53.8) (47.6) (43.0) (39.6)
3000 2650 2400 2250
(85.0) (75.0) (68.0) (63.7)
5300 4750 4300 3900
(150) (135) (122) (110)
10900 9700 8800 8100
(309)
(275) (249) (229)
G G a a s s C C o o n n n n e e c c t t i i o o n n s s
10 ft.
E
3.28 m.
HEATER(S)
100 CFH
80 90 100 125
(24.4) (27.4) (30.5) (38.1)
57 53 50 44
(1.61) (1.50) (1.42) (1.25)
118 110 103 93
(3.34) (3.11) (2.92) (2.63)
220 205 195 175
(6.23) (5.80) (5.52) (4.96)
460 430 400 360
(13.0) (12.2) (11.3) (10.2)
690 650 620 550
(19.5) (18.4) (17.6) (15.6)
1300 1220 1150 1020
(36.8) (34.5) (32.6) (28.9)
2050 1950 1850 1650 1500
(58.0) (55.2) (52.4) (46.7)
3700 3450 3250 2950 2650
(105) (97.7) (92.0) (83.5) (75.0)
7500 7200 6700 6000 5500
(212) (204) (190) (170) (156)
150 175 200
(45.7) (53.3) (61.0)
40 37 35
(1.13) (1.05) (0.99)
84 77 72
(2.38) (2.18) (2.04)
160 145 135
(4.53) (4.11) (3.82)
325 300 280
(9.20) (8.50) (7.93)
500 460 430
(14.2) (13.0) (12.2)
950 850 800
(26.9) (24.1) (22.7)
1370 1280
(42.5) (38.8) (36.2)
2450 2280
(69.4) (64.6)
5000 4600
(142) (130)
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