
51
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
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.
Piping Sizing Examples
A 100 ft pipe run is needed for a 1080 MBH
natural gas heater. The natural gas has a
rating of 1000 Btu/ft
3
and a specific gravity
of 0.6 (Obtain these values from the local
gas supplier.)
Содержание RN Series
Страница 2: ......
Страница 32: ...32 Figure 5 RN Series 6 8 and 10 ton Unit Gasket Locations...
Страница 33: ...33 Figure 6 RN Series 9 and 11 15 ton Unit Gasket Locations...
Страница 34: ...34 Figure 7 RN Series 16 25 and 30 ton Unit Gasket Locations...
Страница 35: ...35 Figure 8 RN Series 26 31 50 60 and 70 ton Unit Gasket Locations...
Страница 42: ...42 Figure 19 Seismic Rigid Mount Curb...
Страница 71: ...71 12 Apply power to wheel and ensure that the wheel rotates freely without interference Belt Replacement...
Страница 80: ...80 Gas Heater Instructions Figure 43 Gas Heater Instructions...
Страница 113: ......
Страница 114: ......
Страница 115: ......