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Gas Piping
Gas supply piping should not allow more than 0.5"W.C.
drop in pressure between gas meter and unit. Supply gas
pipe must not be smaller than unit gas connection.
CAUTION
If a flexible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe
shall be installed at the gas valve and extend outside
the furnace cabinet. The flexible connector can then
be added between the black iron pipe and the gas
supply line.
WARNING
Do not over torque (800 in-lbs) or under torque (350
in-lbs) when attaching the gas piping to the gas
valve.
Gas Supply
1 - This unit is shipped standard for left or right side
installation of gas piping (or top entry in horizontal
applications) Connect the gas supply piping into the
gas valve. The maximum torque is 800 in lbs and
minimum torque is 350 in lbs when attaching the
gas piping to the gas valve.
Nominal
Internal
Iron Pipe
Diameter
Size Inches
inches
(mm)
(mm)
1/2
.622
(12.7)
(17.799)
3/4
.824
(19.05)
(20.930)
1
1.049
(25.4)
(26.645)
1-1/4
1.380
(31.75)
(35.052)
1-1/2
1.610
(38.1)
(40.894)
2
2.067
(50.8)
(52.502)
2-1/2
2.469
(63.5)
(67.713)
NOTE - Capacity given in cubic feet (m3 ) of gas per hour and based on 0.60 specific gravity gas.
Gas Pipe Capacity - ft3/hr (m3/hr)
10
20
30
(3.048)
(6.096)
(9,144)
172
118
95
(4.87)
(3.34)
(2.69)
360
247
199
(10.19)
(7.000)
(5.63)
678
466
374
(19.19)
(13.19)
(10.59)
1350
957
768
(38.22)
(27.09)
(22.25)
2090
1430
1150
(59.18)
(40.49)
(32.56)
4020
2760
2220
(113.83)
(78.15)
(62.86)
6400
4400
3530
(181.22)
(124.59)
(99.95)
2 - When connecting the gas supply piping, consider
factors such as length of run, number of fittings, and
furnace rating to avoid excessive pressure drop.
"TABLE 6" lists recommended pipe sizes for typical
applications.
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
furnace. The piping must be supported at proper
intervals [every 8 to 10 feet (2.44 to 3.01 m)] with
suitable hangers or straps. Install a drip leg in vertical
pipe runs to the unit.
5 - A 1/8" N.P.T. plugged tap or pressure post is located
on the gas valve to facilitate test gauge connection.
See "FIGURE 32".
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'
Compounds used on threaded joints of gas piping
must be resistant to the actions of liquified petroleum
gases.
NOTE - If emergency shutoff is necessary, shut off the
main manual gas valve and disconnect main power to the
furnace. The installer should properly label these devices.
TABLE 6
Length of Pipe - feet (m)
40
50
60
(12,192)
(15.240)
(18.288)
81
72
65
(2.29)
(2.03)
(1.84)
170
151
137
(4.81)
(4.23)
(3.87)
320
284
257
(9.06)
(8.04)
(7.27)
657
583
528
(18.60)
(16.50)
(14.95)
985
873
791
(27.89)
(24.72)
(22.39)
1900
1680
1520
(53.80)
(47.57)
(43.04)
3020
2680
2480
(85.51)
(75.88)
(70.22)
Page 21
IMPORTANT
70
80
90
(21.336)
(24.384)
(27.432)
60
56
52
(1.69)
(1.58)
(1.47)
126
117
110
(3.56)
(3.31)
(3.11)
237
220
207
(6.71)
(6.23)
(5.86)
486
452
424
(13.76)
(12.79)
(12.00)
728
677
635
(20.61)
(19.17)
(17.98)
1400
1300
1220
(39.64)
(36.81)
(34.55)
2230
2080
1950
(63.14)
(58.89)
(55.22)
100
(30,480)
50
(1.42)
104
(2.94)
195
(5.52)
400
(11.33)
600
(17.00)
1160
(32.844)
1840
(52.10)
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