AAON V3-E - Table 10 - Natural Gas (Ft 3;Hr) Maximum Piping Capacities; Table 11 - Propane (Kbtu;Hr) Maximum Piping Capacities; Table 12 - Gas Inlet Pressure; Table 13 - Manifold Pressure

Table 10 - Natural Gas (ft
3
/hr) Maximum Piping Capacities
Specific Gravity = 0.6, Supply Pressure ≤ 0.5 psi, Pressure Drop = 0.5”wc
Pipe Size
Length of Pipe
20 ft
50 ft.
100 ft.
150 ft.
200 ft.
1/2”
120
73
50
40
35
3/4”
250
151
103
84
72
1”
465
285
195
160
135
1-1/4”
950
580
400
325
280
1-1/2”
1460
900
620
500
430
2”
2750
1680
1150
950
800
2-1/2”
4350
2650
1850
1500
1280
Table 11 - Propane (kBtu/hr) Maximum Piping Capacities
Specific Gravity = 1.52, Supply Pressure = 11”wc., Pressure Drop, 0.5”wc
Pipe Size
Length of Pipe
20 ft
50 ft.
100 ft.
150 ft.
200 ft.
1/2”
189
114
78
63
55
3/4”
393
237
162
132
112
1”
732
448
307
252
213
1-1/4”
1496
913
630
511
440
1-1/2”
2299
1417
976
787
675
2”
4331
2646
1811
1496
1260
After verifying gas inlet pressure and
manifold pressure the service technician must
time the gas flow rate through the gas meter
with a stopwatch to verify the gas input rate.
Table 12 - Gas Inlet Pressure
Gas Inlet
Pressures (“wc)
Natural
Gas
Propane
Gas (LP)
Minimum
6.0”wc
11.0”wc
Maximum
10.5”wc
13.0”wc
Unit nameplate input rate value has been
calculated at the altitude where the unit was
shipped. Above 2,000 ft the input rate is
adjusted 4% for every 1,000 ft.
A factory installed pressure tap on the outlet
end of the gas valve can be used to verify the
manifold pressure.
Table 13 - Manifold Pressure
Unit Size (V3-)
Natural
Gas
Propane
Gas (LP)
A
3.5”wc
10.5”wc
B
C
10.0”wc
Do not use gas piping smaller than unit gas
connections. Natural gas pipe runs longer
than 20 feet and propane gas pipe runs longer
than 50 feet may require a larger supply pipe
than the unit connection size. Some utility
companies may also require pipe sizes larger
than the minimum sizes listed.