Installation Guide

TP-6879 3/1514 Section 1 Installation
1.7 Fuel Requirements
Explosive fuel vapors.
Can cause severe injury or death.
Use extreme care when handling,
storing, and using fuels.
WARNING
The fuel system. Explosive fuel vapors can cause severe
injury or death. Vaporized fuels are highly explosive. Use
extreme care when handling and storing fuels. Store fuels in a
well-ventilated area away from spark-producing equipment
and out of the reach of children. Never add fuel to the tank
while the engine is running because spilled fuel may ignite on
contact with hot parts or from sparks. Do not smoke or permit
flames or sparks to occur near sources of spilled fuel or fuel
vapors. Keep the fuel lines and connections tight and in good
condition. Do not replace flexible fuel lines with rigid lines. Use
flexible sections to avoid fuel line breakage caused by
vibration. Do not operate the generator set in the presence of
fuel leaks, fuel accumulation, or sparks. Repair fuel systems
before resuming generator set operation.
Gas fuel leaks. Explosive fuel vapors can cause severe
injury or death. Fuel leakage can cause an explosion. Check
the LP vapor gas or natural gas fuel system for leakage by
using a soap and water solution with the fuel system test
pressurized to 6--8 ounces per square inch (10--14 inches
water column). Do not use a soap solution containing either
ammonia or chlorine because both prevent bubble formation.
A successful test depends on the ability of the solution to
bubble.
Explosive fuel vapors can cause severe injury or death.
Take additional precautions when using the following fuels:
Propane (LP)—Adequate ventilation is mandatory. Because
propane is heavier than air, install propane gas detectors low
in a room. Inspect the detectors per the manufacturer’s
instructions.
Natural Gas—Adequate ventilation is mandatory. Because
natural gas rises, install natural gas detectors high in a room.
Inspect the detectors per the manufacturer’s instructions.
The generator set operates using natural gas or LPG
fuel. The generator set is EPA-certified for both natural
gas and LPG fuels.
The fuel system installation must comply with the NEC
and local codes.
1.7.1 Fuel Supply
Because of variable climates and geographical
considerations, contact the local fuel supplier for fuel
system planning and installation. Figure 1-5 lists the
recommended fuel ratings and other fuel supply
information for natural gas and LPG fuels.
Fuel type
Natural
Gas
LPG
Fuel supply inlet 1/2 NPT
Fuel supply pressure,
kPa (in. H
2
O)
0.87--2.7
(3.5-11)
1.7 --2.7
(7-11)
Fuel flow rate, maximum, Btu/hr.:
8RESV/RESVL 99,200 160,800
10RESV/RESVL 179,000 222,500
12RESV/RESVL 216,000 257,500
Nominal Fuel Rating, Btu/ft.
3
Natural gas 1000
LPG 2500
Figure 1-5 Fuel Supply
Verify that the output pressure from the primary gas
utility pressure regulator is as shown in Figure 1-5 and
that the utility gas meter flow rate is sufficient to supply
the generator set at rated load plus all other
gas-consuming appliances. For LPG tanks, verify that
the output pressure is as shown in Figure 1-5. See
Figure 1-8 for fuel consumption. Contact the fuel
supplier for flow rate information or a gas meter
upgrade, if necessary.
1.7.2 Fuel Pipe Size
Ensure that the fuel pipe size and length meet the
specifications in Figure 1-6. Measure the pipe length
from the primary gas pressure regulator to the pipe
connection on the generator set fuel inlet. Add 2.4 m
(8 ft.) to the measured length for each 90 degree elbow.
Compare the total pipe length with the chart in
Figure 1-6 to find the required pipe size.
Contact local LPG provider for L PG installation
information.