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Gas Heating
WARNING
FOR YOUR SAFETY
Read
the
entire
installation section of this manual
before beginning installation of the
gas heating section.
If you do not follow these instructions
exactly, a fire or explosion may result
causing property damage, personal
Verify the unit nameplate agrees with the
injury or loss of life.
proper gas supply type and amount.
Gas piping shall be installed in accordance
with local codes, or in the absence of local
codes, installation shall conform to the
current (United States) National Fuel Gas
Code ANSI-Z223.1/NFPA 54 or the current
(Canada)
National
Installation Code CSA B149.1 or B149.2.
After verifying
gas inlet pressure and
manifold pressure the service technician shall
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.
Table 24 - Natural Gas Maximum Piping Capacities (ft
- Specific Gravity = 0.6, Supply Pressure ≤ 0.5 psi, Pressure Drop = 0.5" w.c.
Pipe Size
1-1/4"
1-1/2"
2"
2-1/2"
3"
4"
15900
gas
heating
Fuel
&
Propane
20 ft
50 ft.
950
580
1460
900
2750
1680
4350
2650
7780
4740
9660
Table 22 - RZ 45-140 ton Unit Gas Piping
Connections
RZ Small
Gas Input
Quantity
(MBH)
540
810
1080
1350
1620
2100
2580
3060
Table 23 - RZ 145-240 ton Unit Gas Piping
Connections
RZ Medium
Gas Input
Quantity
(MBH)
800
1200
1600
2000
2400
3100
3800
4500
See unit nameplate for unit gas heating
capacities or the Unit Rating Sheet, which
can be obtained from the AAON sales
representative.
Length of Pipe
100 ft.
150 ft.
400
620
1150
1850
1500
3260
2610
6640
5330
Connections
Size
1
1
1
2"
1
1
1
3"
1
1
Connections
Size
1
1
1
2-1/2"
1
1
1
3"
1
1
3
/hr)
200 ft.
325
280
500
430
950
800
1280
2240
4560
85
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