Briggs & Stratton Home Generator System Installation & Start-Up Manual page 11

CAUTION The supplied flexible gaseous pipe is not to
be installed underground or in contact with the ground.
• The entire flexible gaseous pipe must be visible for
periodic inspection and must not be concealed within nor
contact nor run through any wall, floor, or partition.
Where local conditions include earthquake, tornado, unstable
ground, or flood hazards, special consideration shall be
given to increase strength and flexibility of piping supports
and connections.
• Piping must be of the correct size to maintain the
required supply pressures and volume flow under
varying generator load conditions with all gas
appliances connected to the fuel system turned on
and operating.
WARNING Propane and Natural Gas are extremely
flammable and explosive.
Fire or explosion can cause severe
burns or death.
• Before placing the generator into service, the fuel system
lines must be properly purged and leak tested.
• No leakage is permitted.
• Use a pipe sealant or joint compound approved for
use with NG/LPG on all threaded fittings to reduce the
possibility of leakage.
• Installed piping must be properly purged and
leak tested, in accordance with applicable codes
and standards.
Consider the following factors when planning to install the
fuel supply system:
• 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.
• The generator engine is fitted with a fuel mixer system
that meets the specifications of the California Air
Resources Board for "tamper-proof" fuel systems.
• A minimum of one accessible, approved manual
shutoff valve shall be installed in the fuel supply line
within 6 ft (1.8 m) of the generator. A union or flanged
connection shall be provided downstream from this
valve to permit removal of controls.
• Natural gas fuel supply pressure at the generator's fuel
inlet port should be between 5 to 7 inches of water
(in. W.C.) at full load with all gas appliances turned on
and operating.
• LP gas fuel supply pressure should be 11 to 14 inches
of water (in. W.C.) at full load with all gas appliances
turned on and operating.
The generator has been factory set to run on natural gas. If
you need to change from natural gas to LP gas, the unit will
need to be reconfigured, as described in Fuel Conversion.
It is recommended that the fuel connection incorporate the
following components:
• A manual fuel shut-off valve located in the interior of
the building.
• A manual fuel shut-off valve located outside the
building, just before the generator unit.
• Where the formation of hydrates or ice is known to
occur, piping should be protected against freezing. The
termination of hard piping should include a sediment
trap where condensate is not likely to freeze.
• A manometer port should be provided.
The manometer port permits temporary installation of
a manometer to ensure that the engine receives the
correct fuel pressure to operate efficiently throughout its
operating range.
A digital manometer, P/N 19495, is available at your local
Briggs & Stratton service center.
When the initial test runs are completed, the manometer
is removed and the port is plugged. A typical final fuel
connection assembly is shown here, where (A) is the fuel
supply and (B) goes to the home generator.
A
B
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