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Fuel Consumption
Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown below.
Natural Gas LP Vapor
1/2 Load Full Load 1/2 Load Full Load
12 kW 119.46 C 197.00 C 51.00 C 85.32 C
119,460 B 197,000 B 127,500 B 213,300 B
C = Cubic feet per hour
B = BTU’s per hour
Physical Properties LP Vapor Natural
Gas
Normal Atmospheric State Gas Gas
Boiling Point (in °F):
Initial
End
-44
-44
-259
-259
Heating Value:
BTU per gallon (Net LHV*)
BTU per gallon (gross**)
Cubic feet (gas)
83,340
91,547
2,500
63,310
1,000
Density*** 36.39 57.75
Weight† 4.24 2.65
Octane Number:
Research
Motor
110+
97
110+
* LHV (Low Heat Value) is the more realistic rating.
** Gross heat value does not consider heat lost in the form of water
during combustion.
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Fuel Pressure
Both LP vapor and natural gas fuel supply pressure at the
generator’s fuel inlet port should be between the following
levels at full load with all gas appliances turned on
and operating.
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Ensure that all gas line shutoff valves are OPEN and that
adequate fuel pressure is available whenever automatic
operation is desired.
Power Loss
Air density is less at high altitudes, resulting in less available
engine power. Specifically, engine power will decrease 3.5%
for each 1,000 feet (300 meters) above sea level and 1% for
each 10° F (5.6°C) above 77°F (25°C). Make sure you and
your installer consider these factors when determining total
generator load.
Fuel Pipe Sizing
There are numerous on-line or otherwise-published
references for fuel pipe sizing. For example, NFPA 54-Natural
Fuel Gas Code, 2006 (Item #: 320-6031-06) is a
common resource.
The installer should consider the specific gravity of gas and
compensate for a nominal amount of restriction from bends,
fittings, etc. If an unusual number of fittings, bends, or other
restrictions are used, refer to federal and local codes
for guidance.
Fuel Conversion
The engine of your generator system is factory calibrated to
run on natural gas (NG). It may also be operated on liquefied
petroleum (LP) vapor. There is no additional hardware/
equipment required to switch between either fuel. However,
LP fuel inlet pressure must be between 11 and 14 inches
water column at full load with all gas appliances turned on
and operating.
To configure the fuel system for LPuse:
1. Set generator’s system switch to OFF.
2. Remove 15 Amp fuse from control panel.
3. Remove roof, divider, side panels, exhaust panel and
muffler cover.
4. Change main jet in fuel mixer following instructions
provided in LP Conversion Kit.
5. Reinstall muffler cover, exhaust panel, side panels,
divider and roof.
6. Reinstall 15 Amp fuse in control panel.
7. Set generator’s system switch to AUTO.
The system is now ready to operate automatically using LP
vapor fuel.
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