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2.3.3 COMPENSATING FOR RESTRICTIONS
Such materials as screening, louvers, or expanded
metal can restrict the free flow of air. Compensate for
this restriction by making the actual air opening pro-
portionately larger.
Some materials may offer only a 60 percent "free air
inlet area." Other more efficient materials may pro-
vide up to a 90 percent free air inlet area. The per-
centage of free air inlet opening is usually available
from the material supplier or manufacturer.
TO DETERMINE THE ACTUAL AIR INLET OPEN-
ING SIZE REQUIRED, DIVIDE 40 SQUARE INCH-
ES BY THE PERCENTAGE OF FREE AIR INLET
AREA FOR THE MATERIAL YOU WILL USE.
For example: If you plan to use screening with an 80%
free air inlet area, divide 40 by 0.8, which results in
50 square inches. Minimum actual size of air inlet
opening in this case is 50 square inches. An opening
that measures 4 inches wide by 12-1/2 inches long
provides the required air flow (4 x 12.5 = 50 square
inches).
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2.3.4 INVERTER LOCATION
The inverter should be located in a dry, well ventilat-
ed area in order for the inverter to work effectively.
Approximately eight inches of space should be
allowed at each end of the inverter for adequate ven-
tilation. IT SHOULD NOT BE LOCATED IN THE
SAME COMPARTMENT AS THE GENERATOR.
The sensing harnesses supplied with the inverter
have a maximum length of 12 feet. If the cables are
longer than needed, coil the excess near the inverter
unit. If a greater length is needed, contact Generac.
DO NOT ATTEMPT TO SHORTEN OR LENGTHEN
THE SUPPLIED sensing harnesses. The DC power
wires may be cut to the required length. Allow enough
length to make connection. Coil excess inside J-Box.
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2.3.5 TESTING THE INSTALLATION
Generac recommends testing the installation to be
sure adequate cooling air flow is available to the unit
before placing the unit into service. If the unit shows
signs of overheating, you will need to enlarge the air
openings. Never place a unit into service until
absolutely certain that cooling and ventilation is ade-
quate.
IMPORTANT: YOU MUST TEST THE INSTALLATION
ESPECIALLY IF YOU BRING IN AIR FROM BELOW
THE GENERATOR SET.
Section 2 – Installation
IMPACT-36 plus II Recreational Vehicle Generator
2.4
GASOLINE FUEL SYSTEM
Installing a gasoline fuel system (Figure 2.14) for
recreational vehicle generator sets must comply with
applicable codes, standards and regulations. The
entire fuel system must be completely free of leaks.
There must be no possibility of gasoline vapors enter-
ing the vehicle interior.
Figure 2.14 — Generator Fuel System
Gasoline is highly flammable and its vapors
are explosive. Comply with all codes, stan-
dards and regulations pertaining to gasoline
fuel systems used in mobile generators.
Properly install and maintain the fuel system
and keep it entirely free of leaks. Gasoline
vapors must not enter the vehicle interior.
Factory installed generator fuel system components
include (a) fuel filter, (b) 12-volt DC electric pump, (c)
engine carburetor, and (d) interconnecting lines and
fittings. Connect a fuel supply line to the fuel filter
inlet. Use a flexible length of approved fuel hose
between the fuel filter inlet connection and rigid fuel
lines.
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2.4.1 FUEL TANK
Either the generator must share the vehicle engine's
fuel tank, or you must install a separate fuel tank for
the generator set. All fuel tanks installed on the vehi-
cle must be constructed, installed, restrained so it
complies with applicable codes, standards and regu-
lations.
If the generator is to share the vehicle engine's tank,
separate fuel pickup tubes are required for the engine
and the generator. Generac recommends that you
make the fuel pickup tube 2 to 3 inches shorter than
the vehicle engine's pickup tube. This prevents the
generator from depleting the entire fuel supply dur-
ing prolonged generator operating periods.
Carburetor
Generac
®
Power Systems, Inc. 27
Fuel
Inlet
Fuel Pump
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