AAON RN-140 - Manual (Page 53)

53
Table 13 - 55, 65 and 75-140 ton Gas
Connections
Model
Option
B2
Input
MBH
Connections
Quantity Size
M 800 2 1” NPT
N 1600
2
1-1/2”
NPT P 2400
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.
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.
Figure 30 - RN Series Gas Heat Exchanger
Table 14 - Natural Gas (ft
3
/hr) Maximum Piping Capacities
Specific Gravity = 0.6, Supply Pressure ≤ 0.5 psi, Pressure Drop = 0.5” w.c.
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 15 - Propane (kBtu/hr) Maximum Piping Capacities
Specific Gravity = 1.52, Supply Pressure = 11” w.c., Pressure Drop, 0.5” w.c.
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