Generac Power Systems A-2624 - Manual (Page 10)

ENGINE GOVERNED SPEED
The generator is equipped with a 2-pole revolving field
(rotor) which must be driven at 3600 rpm to produce
the unit’s rated AC frequency of 60 Hz. The gas
engine governor was factory set to about 62 Hz. (3000
RPM) at no-load. After installing it, the technician
should check and adjust the governed speed. Setting
no-load frequency slightly high helps prevent exces­
sive frequency, rpm and voltage droop under heavy
electrical loading.
DRIVE BELT
The engine drives the generator rotor by means of a
pulley and drive belt arrangement. The drive belt and
pulleys are warranted for the life of the generator.
Drive belt tension was properly adjusted before the unit
was shipped from the factory. If you suspect that drive
belt tension is incorrect, contact an authorized service
facility.
DANGER: Do not tamper with the engine governor
settings. Excessively high engine speeds are dan­
gerous and increase the risk of personal injury and
damage to equipment and/or property. Excessively
low speeds impose a heavy load on the engine
when adequate engine power is not available and
may shorten engine life. The generator supplies
correct rated frequency and voltage only at the
proper speed. Some electrical devices may be dam­
aged by incorrect frequency and/or voltage. If
engine speed appears to be incorrect, contact your
nearest authorized service facility.
FUEL REQUIREMENTS
These generators are equipped with gasoline fuel sys­
tems as standard equipment. Specific installations
may provide either a separate fuel tank for the genera­
tor, or the generator may “share” the vehicle engine’s
fuel tank.
NOTE: Installations using a “shared” fuel tank may
have a generator fuel pickup tube that is shorter than
the vehicle engine’s pickup tube. Such an arrange­
ment causes the generator engine to “run out of gas”
while adequate fuel for the vehicle remains in the tank.
To reduce lead and carbon deposits use high quality
UNLEADED gasoline with the generator. Leaded
REGULAR grade gasoline is an acceptable substitute.
CAUTION: Generac does not recommend using any
gasoline containing alcohol (such as “gasohol”). If
you use any gasoline containing alcohol, it must not
contain more than 10 percent ethanol and it must be
removed from the tank during storage. Do NOT use
any gasoline containing methanol. If you use gaso­
line with alcohol, inspect more frequently for fuel
leaks and other abnormalities.
OPTIONAL LP GAS FUEL SYSTEM
This generator may be equipped with an optional liquid
propane (LP) gas fuel system. LP gas is usually sup­
plied as a liquid in pressure tanks (Figure 8).
The IM series generators require a “vapor withdrawal”
type fuel system. This type of gaseous fuel system
uses the vapors forming above the liquid fuel in the
storage tank. Air temperatures around the storage
tank must be high enough to sustain adequate fuel
vaporization. In colder climates, you may need to use
an independent heat source to be sure the fuel suffi­
ciently vaporizes in the storage tank.
LP gas may consist of propane, butane, or a mixture of
the two gases. Propane vaporizes at temperatures as
low as -20°F (-29°C), but butane returns to its liquid
state when the temperature drops below about 32°F
(0°C). For that reason, a higher ratio of propane is
desired in the gas mixture when temperatures drop
below freezing.
— 10 —