Generac Power Systems 0940-1 - Manual (Page 25)

Figure 25 — Air Inlet Using Ductwork
COMPENSATING FOR RESTRIQIONS
Such materials as screening, iouvers, or expanded
metal can restrict the free fiow of air. Compensate for
this restriction by making the actuai air opening propor­
tionately larger.
Some materials may offer only a 60 percent ‘1ree 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 OPENING
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 mea­
sures 4 inches wide by 12-1/2 inches long provides the
required air flow (4 x 12.5 = 50 square inches).
INVERTER LOCATION
The inverter should be located in a dry, well ventilated
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 ventilation.
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 SUP­
PLIED SENSING HARNESSES. The DC power wires
may be cut to the required length. Allow enough
length to make connection. Coil excess inside J-Box.
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.