Generac Power Systems 941-2 - Manual (Page 88)

Section 5.2
ENGINE COOLING SYSTEM
Figure 3 — Suspended Mount Inlet Door
Figure 4. Ductwork
Figure 5 — Air Inlet in Vehicle Skirt
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 provide
up to a 90 percent free air inlet area. The percentage
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 INCHES
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).
INVERTER LOCATION
In order for the inverter to work effectively, it should
be located in a dry, well ventilated area.
Approximately eight inches of space should be
allowed at each end of the inverter for adequate ven-
tilation.
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.
CAUTION: Do not install the inverter in the
engine compartment. Overheating may result.
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 ven-
tilation is adequate.
IMPORTANT: YOU MUST TEST THE INSTALLA-
TION ESPECIALLY IF YOU BRING IN AIR FROM
BELOW THE GENERATOR SET.
!
Page 5.2-2