Engine Adjustment - Briggs & Stratton Home Generator System Installation & Start-Up Manual

Engine Adjustment

There are regional variances in the composition of natural
gas. Each home generator unit leaves the factory set for
NG operation. If the generator output voltage or frequency
measured during Initial Start-Up (paragraph #9) is outside
the listed ranges, the combustibility of the gas supplied at
the installation site may be substantially different from the
fuel used at the factory.
To adjust the engine for this difference, proceed as follows.
1. Open the oil drain and control panel access doors.
2. Remove the four screws that hold the circuit breaker
cover to the air intake guard.
3. Connect an accurate frequency meter to the line side of
the generator's main circuit breaker.
4. Ensure that the 15 Amp fuse is installed.
5. Set the generator's main circuit breaker ON.
6. Set the generator's system switch to AUTO.
7. Push MANUAL OVER-RIDE button on control panel.
When the engine starts, allow it to warm up for five
minutes.
8A. For a 9kW generator, normal no load frequency is 52.0
to 52.5 Hz. If adjustment is needed at no load, slowly
rotate the governor adjustment nut (A) clockwise and/or
counterclockwise until frequency is 52.0 to 52.5 Hz.
A
8B. For a 12.5kW and 13.5kW generator, normal no load
frequency is 52.0 to 52.5 Hz. If adjustment is needed at
no load, slowly rotate the governor adjustment screw
(B) clockwise and/or counterclockwise until frequency
is 52.0 to 52.5 Hz.
B
9. Push and hold MANUAL OVER-RIDE button on control
panel again until engine stops.
10. Turn the service disconnect to the transfer switch off.
After a short time delay, the transfer switch will connect
to the generator.
11. Load generator to full load.
12. Connect an accurate frequency meter to the load side of
the generator's main circuit breaker. Frequency should
be above 47.0 Hz.
13. If frequency is below 47.0 Hz, slowly rotate the
governor adjustment nut or screw clockwise and/or
counterclockwise until frequency is above 47.0 Hz.
14. Turn the service disconnect to the transfer switch on.
The transfer switch will connect to the utility after five
minutes.
15. After the engine has stopped running,
• If an adjustment was made in step 13, repeat steps
3 through 9.
• If an adjustment was not made in step 13, proceed
to step 16.
IMPORTANT: If the no load frequency falls out of the no
load parameter after full load adjustment is made, contact an
authorized service center.
16. Reinstall the circuit breaker cover to the air intake
guard.
17. Close the oil drain and control panel access doors.
17