Installation Guide

16
• Use a pipe sealant or joint compound approved for
use with NG/LP on all threaded fittings to reduce the
possibility of leakage.
NOTICE Keep thread sealant out of the gas piping to
prevent component part damage.
• Installed piping must be properly purged and leak tested,
in accordance with applicable codes andstandards.

(A) Generator Fuel Inlet
(B)Flexible Fuel Line
(C)Union Fitting
(D)Manometer Test Port
(E)Sediment Trap
(F)Manual Shut-off Valve
Fuel Consumption
Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown below.
LP Vapor (Propane)
20 kW 17 kW
Cu Ft/Hr 135 118
Gal/Hr (liquid) 3.75 3.28
Full Load
BTU/Hr 337500 295000
Cu Ft/Hr 109 99
Gal/Hr (liquid) 3.03 2.75
3/4 Load
BTU/Hr 272500 247500
Cu Ft/Hr 83 74
Gal/Hr (liquid) 2.31 2.06
1/2 Load
BTU/Hr 207500 185000
Cu Ft/Hr 56 54
Gal/Hr (liquid) 1.56 1.5
1/4 Load
BTU/Hr 140000 135000
Cu Ft/Hr 40 40
Gal/Hr (liquid) 1.11 1.11
Exercise
BTU/Hr 100000 100000
Natural Gas
20 kW
(18 kW)
17 kW
15.3 kW
Cu Ft/Hr 260 248Full Load
BTU/Hr 260000 248000
Cu Ft/Hr 240 2183/4 Load
BTU/Hr 240000 218000
Cu Ft/Hr 187 1701/2 Load
BTU/Hr 187000 170000
Cu Ft/Hr 135 1281/4 Load
BTU/Hr 135000 128000
Cu Ft/Hr 99 99Exercise
BTU/Hr 99000 99000
Recommended
Energy Content of
FuelHeating Value:
LP Vapor Natural Gas
Heating Value:
BTU per gallon (gross**)
Cubic feet (gas)
91,547
2,500

1,000
Fuel Type
An important consideration affecting the entire installation
is the type of fuel used by your generator. The system was
factory tested and adjusted using natural gas, but can be
converted to use LP vapor. For correct engine function,
factors that are inherent to each of these fuels, like your
location and the duration of possible utility interruptions, are
important considerations in the following fuel guidelines:
• Use clean, dry fuel that is free of moisture or
any particulate material. Using fuels outside the
recommendation values that follow can cause
performance problems.
• In engines set up to run on propane (LP), commercial
grade HD5 propane with a minimum fuel energy of 2500
BTUs/ft3 with maximum propylene content of 5% and
butane and heavier gas content of 2.5% and minimum
propane content of 90% is required.
Natural gas rating will depend on specific fuel, but typical
derates are between 10 and20% of the LP gas rating.
Natural gas or LP engines are certified to operate on natural
or liquid propane gas. The emissions control system for this
engine is EM (Engine Modifications).
Fuel Pressure
Both LP vapor and natural gas fuel supply pressure at the
generator’s fuel inlet port and must be between the following
levels at full load with all gas appliances turned on and in
operation.
• NG is 3.5-7” W.C.
• LP is 11-14” W.C.
Make sure that all gas line shutoff valves are OPEN and
that adequate fuel pressure is available whenever automatic
operation is desired.
Not for
Reproduction