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284720-BIM-D-0909
GAS PIPING
Proper sizing of gas piping depends on the cubic feet per
hour of gas flow required, specific gravity of the gas and the
length of run. National Fuel Gas Code Z223.1 or CSA B149.1
should be followed in all cases unless superseded by local
codes or gas company requirements. Refer to Tables 7 & 8.
The heating value of the gas may differ with locality. The
value should be checked with the local gas utility.
NOTE: There may be a local gas utility requirement specify-
ing a minimum diameter for gas piping. All units
require a 1/2 inch pipe connection at the gas valve.
GAS CONNECTION
The gas supply line can be routed through the hole located
on the left side of the unit. Refer to Figure 10 to locate these
access openings. Typical supply piping arrangements are
shown in Figure 8.
Gas piping requirements:
1.
A drip leg and a ground joint union must be installed in
the gas piping.
2.
When required by local codes, a manual shut-off valve
may have to be installed outside of the unit.
3.
Use wrought iron or steel pipe for all gas lines. Pipe dope
should be applied sparingly to male threads only.
AUTOMATIC GAS VALVE
1/2" x 1/2" UNION
1/2" x 1/2" GAS COCK
DRIP LEG
FIGURE 8 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
12
TABLE 7: NATURAL GAS PIPE SIZING CHART
LENGTH
IN FEET
10
20
30
40
50
60
70
80
90
100
1. Maximum capacity of pipe in cubic feet of gas per hour
(based upon a pressure drop of 0.3 inch water column
and 0.6 specific gravity gas).
TABLE 8: PROPANE (LP) GAS PIPE SIZING
LENGTH
IN FEET
10
20
30
40
50
60
70
80
1/2" - NPTF
90
100
1. Maximum capacity of pipe in thousands of BTU per
hour (based upon a pressure drop of 0.5 inch water col-
umn).
NOMINAL INCHES IRON PIPE SIZE
1/2"
3/4"
132
278
92
190
73
152
63
130
56
115
50
105
46
96
43
90
40
84
38
79
1
CHART
NOMINAL INCHES IRON PIPE SIZE
1/2"
3/4"
275
567
189
393
152
315
129
267
114
237
103
217
96
196
89
185
83
173
78
162
Johnson Controls Unitary Products
1
1"
1-1/4"
520
1,050
350
730
285
590
245
500
215
440
195
400
180
370
170
350
160
320
150
305
1"
1-1/4"
1,071
2,205
732
1,496
590
1,212
504
1,039
448
913
409
834
378
771
346
724
322
677
307
630
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