84
12.2 - Pipe sizing
for natural gas
Refer to Figure 12-2 for pipe length
and diameter. For additional gas
pipe sizing information, refer to ANSI
Z223.1 (or B149.1 for Canadian
installations).
Natural gas supply pressure
requirements
1. Pressure required at the gas valve
inlet pressure port:
• Maximum 13”W.C. with no fl ow
(lockup) or with heater off.
• Minimum 3”W.C. with gas fl owing
(verify during high fi re).
2. Install 100% lockup gas pressure
regulator in supply line if inlet
pressure can exceed 13”W.C. at
any time. Adjust lockup regulator
for 13”W.C. maximum.
12 - INSTALLATION - Gas supply
12.3 - Propane Gas
WARNING!!!
These heaters
are typically shipped ready
to fi re on natural gas. Check
heater rating plate to determine
which fuel the heater is set for.
If set to natural gas, it may be
converted to LP by following
instruction on Section 12.6 or
12.7. Failure to comply could
result in severe personal injury,
death, or substantial property
damage.
Pipe sizing for propane gas
Contact gas supplier to size pipes,
tanks, and 100% lockup gas pressure
regulator.
Propane supply pressure
requirements:
1. Adjust propane supply regulator
provided by the gas supplier for
13”W.C. maximum pressure.
2. Pressure required at gas valve inlet
pressure port:
• Maximum 13”W.C. with no fl ow
(lockup) or with heater off.
• Minimum 3”W.C. with gas fl owing
(verify during high fi re).
WARNING!!!
Ensure that
the high gas pressure regulator
is at least 6 - 10 ft upstream
of the appliance. Failure to
comply could result in severe
personal injury, death, or
substantial property damage.
Iron Pipe size (in)
Nominal: 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4
Actual ID: 0.824 1.049 1.380 1.610 2.067 2.469 3.068 4.026
Length (ft) Capacity in Cubic Feet of Gas per Hour
10 273 514 1060 1580 3050 4860 8580 17500
20 188 353 726 1090 2090 3340 5900 12000
30 151 284 583 873 1680 2680 4740 9660
40 N/A 243 499 747 1440 2290 4050 8270
50 N/A 215 442 662 1280 2030 3590 7330
60 N/A 195 400 600 1160 1840 3260 6640
70 N/A 179 368 552 1060 1690 3000 6110
80 N/A 167 343 514 989 1580 2790 5680
90 N/A 157 322 482 928 1480 2610 5330
100 N/A 148 304 455 877 1400 2470 5040
125 N/A 131 269 403 777 1240 2190 4460
150 N/A 119 244 366 704 1120 1980 4050
175 N/A N/A 224 336 648 1030 1820 3720
200 N/A N/A 209 313 602 960 1700 3460
250 N/A N/A 185 277 534 851 1500 3070
NOTICE! Maximum pipe capacity is based on a 0.60 specifi c gravity gas at a pressure of 0.5 PSIG and a
0.3”WC pressure drop
Figure 12-2 Gas pipe capacity for natural gas
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