Table of Contents
Advertisement
Internal
Nominal Iron
Diameter
Pipe 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 of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.
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 to the piping
assembly.
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
8 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 20.
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.
IMPORTANT
Compounds used on threaded joints of gas piping must
be resistant to the actions of liquified petroleum gases.
Page 18 of 38
Gas Pipe Capacity - FT³/HR (kL/HR)
10
20
30
(3.048)
(6.096)
(9.144)
172
118
95
(4.87)
(3.34)
(2.69)
360
247
199
(10.19)
(7.00)
(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
2200
(113.83)
(78.15)
(62.30)
6400
4400
3530
(181.22)
(124.59)
(99.95)
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)
(4.28)
(3.87)
320
284
257
(9.06)
(8.04)
(7.27)
657
583
528
(18.60)
(16.50)
(16.50)
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)
Table 8.
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.
Leak Check
After gas piping is completed, carefully check all field-
installed piping connections for gas leaks. Use a
commercially available leak detecting solution specifically
manufactured for leak detection. Never use an open flame
to test for gas leaks.
The furnace must be isolated from the gas supply
system by closing the individual manual shut-off valve
during any gas supply system at pressures greater than
or equal to 1/2 psig (3.48 kPa, 14 inches w.c.). This
furnace and its components are designed, manufactured
and independently certified to comply with all applicable
ANSI/CSA standards. A leak check of the furnace and its
components is not required.
Issue 2220
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)
488
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)
Figure 20.
508145-01G / 31-5000660
100
(30.480)
50
(1.42)
104
(2.94)
195
(5.52)
400
(11.33)
600
(17.00)
1160
(32.84)
1840
(52.10)
Advertisement
Table of Contents
