Gas Piping; Gas Connection; External Supply Connection External Shut-Off; Natural Gas Pipe Sizing Chart - York DNZ 024 Installation Manual

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should be followed in all cases unless superseded by local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 5 & 6.
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 6 to locate these
access openings. Typical supply piping arrangements are
shown in Figure 4.
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.
1 / 2 x 1 / 2 U N I O N
1 / 2 x 1 / 2 G A S C O C K
D R I P L E G
FIGURE 4 - EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF
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A U T O M A T I C
G A S V A L V E
1 / 2 - 1 4 N P T
TABLE 5: NATURAL GAS PIPE SIZING CHART
NOMINAL INCHES IRON PIPE SIZE
LENGTH
IN FEET
1/2"
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 43
90 40
100 38
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 6: PROPANE (LP) GAS PIPE SIZING
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CHART
NOMINAL INCHES IRON PIPE SIZE
LENGTH
IN FEET
1/2"
10 275
20 189
30 152
40 129
50 114
60 103
70 96
80 89
90 83
100 78
1.
Maximum capacity of pipe in thousands of BTU per
hour (based upon a pressure drop of 0.5 inch water col-
umn).
66433-YIM-B-1004
3/4" 1" 1-1/4"
278 520 1,050
190 350 730
152 285 590
130 245 500
115 215 440
105 195 400
96 180 370
90 170 350
84 160 320
79 150 305
3/4" 1" 1-1/4"
567 1,071 2,205
393 732 1,496
315 590 1,212
267 504 1,039
237 448 913
217 409 834
196 378 771
185 346 724
173 322 677
162 307 630
Unitary Products Group
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