Resizethecommonventingsystemto theminimum
ventpipesizedeterminedbyusingtheappropriate
tablesinAppendixG.(Theseareinthecurrentstan-
dardsoftheNationalFuelGasCodeANSIZ223.1in
theUSA,andtheappropriateCategory1NaturalGas
andPropaneappliancesventingsizingtablesinthe
currentstandardsoftheCSAB149NaturalGasand
PropaneInstallationCodesinCanada.)
XkCAUTION
3 - The gas piping must not run in or through air ducts,
clothes chutes, gas vents or chimneys, dumb waiters,
or elevator shafts.
4 - The piping should be sloped 1/4 inch (6,4 mm) per 15
feet (4,57 m) upward toward the meter from the fur-
nace. The piping must be supported at proper intervals
[every 8 to 10 feet (2.44 to 3.01 m)] with suitable hang-
ers or straps, Install a drip leg inside vertical pipe runs
to the unit.
5 - A 1/8" N.RT. plugged tap or pressure post is located
on the gas valve to facilitate test gauge connection.
See figures 26 and 27.
6 - In some localities, codes may require the installation of
a manual main shut-off valve and union (furnished by
the installer) external to the unit, The union must be of
the ground joint type.
Gas Supply
1 - This unit is shipped standard for left or right side instal-
lation of gas piping (or top entry in horizontal applica-
tions). Connect the gas supply to the piping assembly.
2 - When connecting the gas supply piping, consider fac-
tors such as length of run, number of fittings, and fur-
nace rating to avoid excessive pressure drop. Table 9
lists recommended pipe sizes for typical applications.
klMPORTANT
NOTE - If emergency shutoff is necessa04 shut off the main
manual gas valve and disconnect main power to the fur-
nace. The installer should properly label these devices.
Nominal
IronPipe Internal
Size Diameter
inches inches
(ram) (ram)
3/8
(9.53)
1/2
(12.7)
3/4
(19.05)
1
(25.4)
1-1/4
(31.75)
1-1/2
(38.1)
2
(50.8)
2-1/2
(63.5)
3
(76.2)
NOTE - Capacity given in
TABLE 9
Gas Pipe Capacity - ft3/hr (m3/hr)
Length of Pipe - feet (m)
10 20 30 40 50 60 70 80 90 lOO
(3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480)
.493 95 65
(12.522) (2.69) (1.84)
.622 175 120
(17.799) (4.96) (3.40)
.824 360 250
(20.930) (10.19) (7.08)
1.049 680 465
(26.645) (919.25) (13.17)
1.380 1400 950
(35.052) (39.64) (26.90)
1.610 2100 460
(40.894) (59.46) (41.34)
2.067 3950 2750
(52.502) (111.85) (77.87)
2.469 6300 4350
(67.713) (178.39) (123.17)
3.068 11000 7700
(77.927) (311.48) (218.03)
cubic feet
52
(1.47)
97
(2.75)
2OO
(5.66)
375
(10.62)
77O
(21.80)
1180
(33.41)
2200
(62.30)
3520
(99.67)
6250
(176.98)
45
(1.27)
82
(2.32)
170
(4.81)
32O
(9.06)
66O
(18.69)
990
(28.03)
1900
(53.80)
3000
(84.95
5300
(150.07)
4O
(1.13)
73
(2.07)
151
(4.28)
285
(8.07)
580
(16.42)
9OO
(25.48)
1680
(47.57)
2650
(75.04)
4750
(134.50)
36
(1.02)
66
(1.87)
138
(3.91)
26O
(7.36)
53O
(15.01)
810
(22.94)
1520
(43.04)
2400
(67.96)
4300
(121.76)
33
(.73)
61
(1.73)
125
(3.54)
24O
(6.80)
490
(13.87)
75O
(21.24)
1400
(39.64)
2250
(63.71)
3900
(110.43)
(m3 ) of gas per hour and based on O.60 specific gravity gas.
31
(.88)
57
(1.61)
118
(3.34)
22O
(6.23)
46O
(13.03)
69O
(19.54)
1300
(36.81)
2050
(58.05)
3700
(104.77)
29
(.82)
53
(1.5o)
110
(3.11)
2O5
(5.80)
430
(12.18)
65O
(18.41)
1220
(34.55)
1950
(55.22)
3450
(97.69)
27
(.76)
5O
(1.42)
103
(2.92)
195
(5.52)
400
(11.33)
62O
(17.56)
1150
(32.56)
1850
(52.38)
3250
(92.03)
Page 21
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