Lennox G21Q Series Installation Instructions Manual page 15

Nominal Nominal Internal Internal
Iron Pipe Size Diameter
- -Inches(mm) - -Inches(mm)
1/4 .364
(6.35) (9.246)
3/8 .493
(9.53) (12.522)
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 (m
The above connectors may be used if acceptable
by the authority having jurisdiction. A gas connec-
tor is provided and, if used, should be installed be-
tween the manual main shut- -off valve and ground
joint union. See figure 19 for correct piping.
3 - - Center gas line through piping hole.
should not touch side of unit.
4 - - Connect gas supply line.
MANUAL MAIN
SHUT- -OFF VALVE
1/8” (3.2mm)
N.P .T.
PLUGGED
GAS CONNECTOR*
TAP
RIGHT SIDE PIPING
(STANDARD)
GAS VALVE
GAS CONNECTOR*
*Gas connector may be used for Canadian installation if acceptable by local authority
having jurisdiction.
FIGURE 19
GAS PIPE CAPACITY - - FT
10 20
(3.048) (6.096)
43 29
(1.13) (.82)
95 65
(2.69) (1.84)
175 120
(4.96) (3.40)
360 250
(10.19) (7.08)
680 465
(19.25) (13.17)
1400 950
(39.64) (26.90)
2100 460
(59.46) (41.34)
3950 2750
(111.85) (77.87)
6300 4350
(178.39) (123.17)
11000 7700
(311.48) (218.03)
23000 15800
(651.27) (447.39)
!
) of gas per hour and based on 0.60 specific gravity gas.
LEFT SIDE PIPING
GAS VALVE
GROUND JOINT
UNION
MANUAL MAIN
SHUT- -OFF VALVE
GROUND JOINT
UNION
1/8” (3.2mm)
N.P .T.
PLUGGED TAP
TABLE 5
!
/HR (kL/HR)
Length of Pipe- -Feet(m)
30 40 50
(9.144) (12.192) (15.240)
24 20 18
(.68) (.57) (.51)
52 45 40
(1.47) (1.27) (1.13)
97 82 73
(2.75) (2.32) (2.07)
200 170 151
(5.66) (4.81) (4.28)
375 320 285
(10.62) (9.06) (8.07)
770 660 580
(21.80) (18.69) (16.42)
1180 990 900
(33.41) (28.03) (25.48)
2200 1900 1680
(62.30) (53.80) (47.57)
3520 3000 2650
(99.67) (84.95 (75.04)
6250 5300 4750
(176.98) (150.07) (134.50)
12800 10900 9700
(362.44) (308.64) (274.67)
Flexible gas connec
the unit. Flex connector must be installed in U- -
shaped fashion in order to achieve its purpose
Gas line
(See figure 19). Do not secure to unit ducting or
structure.
B - - Leak Check
After gas piping is completed, carefully check all piping
connections (factory- - and field- -installed) for gas leaks.
Use a leak detecting solution or other preferred means.
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60 70 80
(18.288) (21.336) (24.384)
16 15 14
(.45) (.42) (.40)
36 33 31
(1.02) (.73) (.88)
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)
8800 8100 7500
(249.18) (229.36) (212.37)
CAUTION
tor must not be used to exit
&$87,21
,03257$17
90 100
(27.432) (30.480)
13 12
(.37) (.34)
29 27
(.82) (.76)
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)