Fuel System Selection; Initial Start-Up (No Load) - Briggs & Stratton Home Generator System Installation & Start-Up Manual

Fuel System Selection

The engine of your Home Generator System is factory
calibrated to run on natural gas (NG). The 9kW and 12.5kW
home generators 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 27 to 37 mbar.
An additional fuel regulator may be installed to supply the
proper fuel pressure to the generator.
To configure the fuel system for LP use:
1. Open control panel and oil fill access doors.
2. Set generator's system switch to OFF.
3. Remove 15 Amp fuse from control panel.
For a 9kW Home Generator System:
4. Connect the fuel select solenoid by joining the two-pin
electrical connector (A).
A
5. Reinstall 15 Amp fuse in control panel.
6. Set generator's system switch to AUTO.
7. Close control panel and oil fill access doors.
The system is now ready to operate automatically using LP
fuel. With a fixed main jet for LP gas, there is no need to
perform any engine adjustments for LP operation.
For a 12.5kW Home Generator System:
4. Remove cap from LP inlet on T-valve.
5. Remove fuel line from NG inlet.
6. Place cap from LP inlet onto NG inlet.
7. From oil fill access area, pull fuel line out of top hole
and route it through bottom hole.
IMPORTANT: Failure to route fuel line through bottom hole
may cause the fuel line to kink. When tightening fuel hose
fittings make certain the fuel hose does not twist or kink.
If the fuel line kinks, the generator may start but will not
operate properly.
8. Connect fuel line (B) to LP inlet (C).
B
16
The system is now ready to operate automatically using LP
fuel.

Initial Start-up (No Load)

Before operating the home generator or placing it into
service, inspect the entire installation carefully.
Then begin testing the system without any electrical loads
connected, as follows:
NOTE: When the home generator is started for the very
first time, it will require that air in the gaseous fuel lines be
purged. This may take a few minutes.
NOTE: If either parameter is outside these ranges, perform
the Engine Adjustments described below.
IMPORTANT: DO NOT proceed until you are certain that
generator AC voltage and frequency are correct and within
the stated limits. To obtain the proper generator frequency,
see Engine Adjustments.
C
9. Reinstall 15 Amp fuse in control panel.
10. Set generator's system switch to AUTO.
11. Close control panel and oil fill access doors.
1. Set generator's main circuit breaker to its ON (closed)
position.
2. Install 15 Amp fuse in control panel.
3. Set generator's system switch to AUTO.
4. Push MANUAL OVER-RIDE button on control panel.
5. DO NOT crank engine for more than 10 seconds, then
pause for 10 seconds to reduce heat in the starter.
6. Repeat process until engine starts.
7. Listen for unusual noises, vibration or other indications
of abnormal operation. Check for oil leaks while engine
runs.
8. Let engine warm up for about five minutes to allow
internal temperatures to stabilize.
9. Connect an accurate AC voltmeter and a frequency
meter to check generator output at load side of circuit
breaker. Voltage should be 229-252 Volts, frequency
should be 52.0 - 52.5 Hz.
10. Check generator output between one of the generator
connection lugs and the neutral lug, then between the
other generator connection lug and the neutral lug.
In both cases, voltage reading should be between
114-126 Volts.
11. Push and hold MANUAL OVER-RIDE button on control
panel again until engine stops.
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