Generac Power Systems 0595-0 - 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 a-c frequency of 60 Hz. The gas
engine governor was factory set to about 62 Hz.
(3720) 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.
DANGER: DO NOT TAMPER WITH THE ENGINE
GOVERNOR SEHINGS. EXCESSIVELY HIGH
ENGINE SPEEDS ARE DANGEROUS 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 COR­
RECT RATED FREQUENCY AND VOLTAGE ONLY AT
THE PROPER SPEED. SOME ELECTRICAL
DEVICES MAY BE DAMAGED BY INCORRECT FRE­
QUENCY 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.
A
CAUTION: Generac does not recommend using any
gasoline containing alcohol (such as “gasohoi”). 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 (Model 9051)’. LP gas is
usually supplied 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.
Figure 8 —Typical LP Gas Fuel System
FUEL
LOCKOFF
WITHDRAWAL
TANK
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8
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