Lennox 97G2DFV Installation Instructions Manual page 35

Warm air gas furnace downflow air discharge direct vent & non-direct vent
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Left Side Piping
MANUAL
MAIN SHUT-OFF
VALVE
(With 1/8 in. NPT
Plugged Tap Shown)
GROUND
JOINT
UNION
DRIP LEG
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)
3
3.068
(76.2)
(77.927)
4
4.026
(101.6)
(102.260)
NOTE: Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.
508405-01
(Standard)
AUTOMATIC
GAS VALVE
(with manual
shut-off valve)
NOTE - BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
Gas Pipe Capacity - FT³/HR (kL/HR)
10
20
(3.048)
(6.096)
(9.144)
175
120
(4.96)
(3.40)
(2.75)
360
250
(10.19)
(7.08)
(5.66)
680
465
(19.25)
(13.17)
(10.62)
1400
950
(39.64)
(26.90)
(21.80)
2100
460
1180
(59.46)
(41.34)
(33.41)
3950
2750
2200
(111.85)
(77.87)
(62.30)
6300
4350
3520
(178.39)
(123.17)
(99.67)
11000
7700
6250
(311.48)
(218.03)
(176.98)
23000
15800
12800
(651.27)
(447.39)
(362.44)
FIELD
PROVIDED
AND INSTALLED
Figure 53.
Length of Pipe - feet (m)
30
40
50
(12.192)
(15.240)
97
82
73
(2.32)
(2.07)
200
170
151
(4.81)
(4.28)
375
320
285
(9.06)
(8.07)
770
660
580
(18.69)
(16.42)
990
900
(28.03)
(25.48)
1900
1680
(53.80)
(47.57)
3000
2650
(84.95)
(75.04)
5300
4750
(150.07)
(134.50)
10900
9700
(308.64)
(274.67)
Table 10.
Issue 2341
AUTOMATIC
GAS VALVE
(with manual
shut-off valve)
60
70
80
(18.288)
(21.336)
(24.384)
66
61
57
(1.87)
(1.73)
(1.61)
138
125
118
(3.91)
(3.54)
(3.34)
260
240
220
(7.36)
(6.80)
(6.23)
530
490
460
(15.01)
(13.87)
(13.03)
810
750
690
(22.94)
(21.24)
(19.54)
1520
1400
1300
(43.04)
(39.64)
(36.81)
2400
2250
2050
(67.96)
(63.71)
(58.05)
4300
3900
3700
(121.76)
(110.43)
(104.77)
9700
8100
7500
(274.67)
(229.36)
(212.37)
MANUAL
MAIN SHUT-OFF
VALVE
(With 1/8 in. NPT
Plugged Tap
Shown)
GROUND
JOINT
UNION
DRIP LEG
Right Side Piping
(Alternate)
90
100
(27.432)
(30.480)
53
50
(1.50)
(1.42)
110
103
(3.11)
(2.92)
205
195
(5.80)
(5.52)
430
400
(12.18)
(11.33)
650
620
(18.41)
(17.56)
1220
1150
(34.55)
(32.56)
1950
1850
(55.22)
(52.38)
3450
3250
(97.69)
(92.03)
7200
6700
(203.88)
(189.72)
Page 35 of 53

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