Generac GEN10AD Manuel D'installation page 16

Engine Adjustment
There are regional variances in the composition of natural
gas. Each residential 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. Remove the oil drain and control panel access covers.
2. Connect an accurate frequency meter to the line side of
the generator's main circuit breaker.
3. Ensure that the 15 Amp fuse is installed.
4. Set the generator's main circuit breaker ON.
5. Set the generator's system switch to AUTO.
6. Push MANUAL OVER-RIDE button on control
panel. When the engine starts, allow it to warm up for
five minutes.
7. Normal no load frequency is 62.0 to 62.5 Hz. If
adjustment is needed at no load, slowly rotate
the governor adjustment nut (A) clockwise and/or
counterclockwise until frequency is 62.0 to 62.5 Hz.
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8. Push and hold MANUAL OVER-RIDE button on
control panel again until engine stops.
9. Turn the service disconnect to the transfer switch off.
After a short time delay, the transfer switch will connect
to the generator.
10. Load generator to full load.
11. Connect an accurate frequency meter to the load side of
the generator's main circuit breaker. Frequency should
be above 57.0 Hz.
12. If frequency is below 57.0 Hz, slowly rotate the
governor adjustment nut or screw clockwise and/or
counterclockwise until frequency is above 57.0 Hz.
13. Turn the service disconnect to the transfer switch
on. The transfer switch will connect to the utility after
five minutes.
14. After the engine has stopped running,
• If an adjustment was made in step 12, repeat steps
3 through 8.
• If an adjustment was not made in step 12, proceed
to step 15.
IMPORTANT: If the no load frequency falls out of the no
load parameter after full load adjustment is made, contact an
authorized service center.
15. Install the oil drain and control panel access covers.
A