Section 5: Fuel Conversion/Gas Connections; Fuel Requirements And Recommendations; Btu Content; Fuel Pressure - Generac Power Systems PowerPact 7.5 kW Installation Manuallines

Section 5: Fuel Conversion/Gas Connections

Fuel Requirements and
Recommendations
DANGER
Explosion and fire. Fuel and vapors are extremely
flammable and explosive. No leakage of fuel is
permitted. Keep fire and spark away. Failure to do
so will result in death or serious injury.
NOTE: Natural gas (NG) is lighter than air and will collect
in high areas. Liquid propane (LP) gas is heavier than air
and will settle in low areas.
LP gas should only use a vapor withdrawal system. This
type of system uses the vapors formed above the liquid
fuel in the storage tank.
The unit will run on NG or LP gas, but has been
configured at the factory to run on NG gas.
NOTE: Should the primary fuel need to be changed to
LP gas, the fuel system needs to be reconfigured. See

Fuel Conversion

for instructions on converting the fuel
system.

BTU Content

Recommended fuels should have a BTU content of at
3
least 1,000 BTU/ft (37.26 MJ/m
3
least 2,500 BTU/ft (93.15 MJ/m
NOTE: BTU fuel content information is available from the
fuel supplier.

Fuel Pressure

Required fuel pressure for natural gas is 5–7 inches
water column (9–13 mm mercury). Required fuel
pressure for liquid propane vapor is 10–12 in H
mm HG).
NOTE: The primary regulator for the propane supply is
NOT INCLUDED with the generator.
NOTE: All pipe sizing, construction and layout must
comply with NFPA 54 or the ICC International Fuel Gas
Code for natural gas and liquid propane applications.
Once the generator is installed, verify fuel pressure
NEVER drops below the required specification. For
further information regarding NFPA requirements refer to
the NFPA website at www.nfpa.org.
Always consult local fuel suppliers or the fire marshal to
check codes and regulations for proper installation. Local
codes will mandate correct routing of gaseous fuel line
piping around gardens, shrubs, and other landscaping.
Installation Guidelines for 60 Hz PowerPact™
(000192)
3
) for natural gas; or at
3
) for LP gas.
O (19–22
2
Fuel Conversion/Gas Connections
Piping strength and connections should be given special
consideration when installation takes place in areas at
risk for; flooding, tornadoes, hurricanes, earthquakes,
and unstable ground.
IMPORTANT NOTE: Use an approved pipe sealant or
joint compound on all threaded fittings.
NOTE: All installed gaseous fuel piping must be purged
and leak tested prior to initial start-up in accordance with
local codes, standards and regulations.
Fuel Conversion
1. Remove the four 6 mm hex head screws and lift
the top lid from the generator enclosure.
2. Remove the two 4 mm hex head fasteners. Lift and
remove the rear panel.
3. See Figure 5-1. Use a pliers to squeeze the hose
clamp (A) and slide from the fuel inlet (B).
B
D
A
Figure 5-1. Fuel Conversion
4. Remove the hose (C) from the fuel inlet.
5. Remove the NG fuel jet (D) from the fuel inlet. If the
nozzle is found to be inside the hose, remove it
with a needle nose pliers.
6. Locate the LP fuel jet (supplied). It has a smaller
inside diameter than the NG jet.
7. Insert the LP fuel jet into the end of the fuel inlet.
8. Install the hose on the fuel inlet. Secure the hose
with the clamp.
9. Verify the hose has not been kinked in any way.
10. Install the rear access panel by hooking it on the
top of the unit. Check to verify the alternator bellow
is completely secure around the frame provided on
the access panel. Attach the panel firmly to the unit
with the two shorter hex head screws.
11. Install the top lid and secure with four long hex
head screws.
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