4-2
FIGURE 4-2. MOUNTING BASE
DJB MOUNTING BASE
DJE MOUNTING BASE
M1198
12.12 IN.
(308 CM)
11.50 IN.
(292 CM.)
4.25 IN.
(108
CM.)
7.88 IN.
(220
CM.)
4.25 IN.
(108
CM.)
13.00 IN.
(330 CM.)
MOUNTING
SUPPORTS FOR
VACU-FLO UNIT
12-1/8"
(308 MM)
11-1/2"
FRONT
(292 MM)
(4) 7/16 INCH
(11 MM BOLTS)
VENTILATION
Air circulation is needed to dissipate heat produced by
the engine and generator in normal operation. Outdoor
installations can rely on natural circulation, but mobile, in-
door or housed installations need proper size and posi-
tioned vents for required air flow. See SPECIFICATIONS
for air requirements.
Vent sizes depend on variable conditions:
•
Size of enclosure
•
Ambient temperature
•
Electrical load
•
Running time
•
Restrictions imposed by screens, louvers, or
filters
•
Prevailing wind direction
The required volume of air must reach the unit, absorb
the heat, and be discharged away from the installation.
Air Intake Requirements
DJB - Vacu-Flo
®
Cooling:
On the DJB, the Vacu-Flo
cooling inlet vent must be at least 1-1/3 sq. ft (1236 cm
2
)
in area; the duct for discharged air should be at least as
large as the scroll outlet. Section 2 of this manual,
SPECIFICATIONS, lists the air flow requirement for this
set. See Figure 4-3.
DJE - Pressure Cooling:
The pressure-cooled DJE
needs an inlet vent with an unrestricted opening of at
least 3-1/2 square feet (3252 cm
2
) for variables. Section
2 of this manual, SPECIFICATIONS, lists the air flow re-
quirement for this set. See Figure 4-4.
Air Discharge Requirements
DJE and DJB Gensets:
Install separate ducts for air
discharge from the engine and generator (see exception)
as follows:
1. The engine discharge duct must be the same size
as the engine outlet: 8 x 10 inches (203 x 254 mm).
If a screen is used in the duct, increase the duct size
in proportion to the restriction. Consider installing
the screen diagonally to limit the restriction, and in-
crease duct size for runs over 9 feet (2.74 m). If
bends are necessary, use large radius elbows. Use
a canvas section at the set to absorb vibration and
noise.
2. Generator outlet ducts must be used when units are
installed in compartments too small for operator to
walk. Ducts are recommended for all other indoor
installations. The air outlet is 5-5/8 x 3 inches (140 x
76 mm). Follow the same principles of duct design
and installation as used for the engine duct. Engine
and generator require separate ducts.
Auxiliary fans can be used to increase airflow to units in-
stalled in small, poorly ventilated rooms. The fan size
and location should be such that the air inlet to the engine
