COMFORT-AIRE Century GDD95C Installation Instructions Manual page 32

Warm air gas furnace downflow air discharge
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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
Bellows Grommet
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.
Page 32 of 53
(Standard)
AUTOMATIC
GAS VALVE
(with manual
shut−o valve)
NOTE − BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET
Gas Pipe Capacity - FT³/HR (kL/HR)
10
20
30
(3.048)
(6.096)
(9.144)
175
120
97
(4.96)
(3.40)
(2.75)
360
250
200
(10.19)
(7.08)
(5.66)
680
465
375
(19.25)
(13.17)
(10.62)
1400
950
770
(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)
AUTOMATIC
GAS VALVE
(with manual
Plug
shut−o valve)
Plug
FIELD
PROVIDED
AND INSTALLED
Figure 52.
Length of Pipe - feet (m)
40
50
60
(12.192)
(15.240)
(18.288)
82
73
66
(2.32)
(2.07)
(1.87)
170
151
138
(4.81)
(4.28)
(3.91)
320
285
260
(9.06)
(8.07)
(7.36)
660
580
530
(18.69)
(16.42)
(15.01)
990
900
810
(28.03)
(25.48)
(22.94)
1900
1680
1520
(53.80)
(47.57)
(43.04)
3000
2650
2400
(84.95)
(75.04)
(67.96)
5300
4750
4300
(150.07)
(134.50)
(121.76)
10900
9700
9700
(308.64)
(274.67)
(274.67)
Table 11.
Issue 1933
MANUAL
MAIN SHUT−OFF
(With 1/8 in. NPT
Plugged Tap
GROUND
JOINT
UNION
DRIP LEG
Right Side Piping
(Alternate)
Bellows Grommet
70
80
90
(21.336)
(24.384)
(27.432)
61
57
53
(1.73)
(1.61)
(1.50)
125
118
110
(3.54)
(3.34)
(3.11)
240
220
205
(6.80)
(6.23)
(5.80)
490
460
430
(13.87)
(13.03)
(12.18)
750
690
650
(21.24)
(19.54)
(18.41)
1400
1300
1220
(39.64)
(36.81)
(34.55)
2250
2050
1950
(63.71)
(58.05)
(55.22)
3900
3700
3450
(110.43)
(104.77)
(97.69)
8100
7500
7200
(229.36)
(212.37)
(203.88)
VALVE
Shown)
100
(30.480)
50
(1.42)
103
(2.92)
195
(5.52)
400
(11.33)
620
(17.56)
1150
(32.56)
1850
(52.38)
3250
(92.03)
6700
(189.72)
507735-03

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