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2.2.4
ACOUSTICS
For additional noise abatement, the installer may wish to consider
the following:
•
Using special sound insulating materials.
•
Construction of a special noise abatement compartment.
Any method used to reduce noise must not adversely
affect the flow of cooling and ventilating air into or
out of the compartment.
In addition to the effective use of sound insulating materials,
construction of a special noise abatement compartment might be
considered to reduce noise levels. Such a compartment might be
constructed as follows (Figure 2.7):
•
Use 5/8-inch thick or 3/4-inch thick plywood in the compart-
ment.
•
Construct the compartment floor of a double thickness of 5/8-
inch or 3/4-inch plywood.
•
Line the compartment interior walls and floor, as well as the
underside of the floor, with 26-gauge galvanized steel.
•
Vapor seal all compartment seams and joints.
•
Over the galvanized steel lining, install a combination of acousti-
cal materials as mentioned in "Sound Insulating Materials".
DANGER
To prevent fire or explosion, do not install any
insulation or other absorbent materials on the
interior or underside of the compartment floor.
•
Seal all compartment door edges to prevent noise leakage
around the door perimeter.
Figure 2.7 – Typical Noise Abatement
•
Line the compartment door interior (except for air openings)
with suitable, fireproof sound insulation (such as 1-inch (25
mm) thick fiberglass with a 2-pound density).
NOTE:
Section 2 – Installation
Recreational Vehicle Generators
2.2.5
COMPARTMENT FLOOR CUTOUTS
Provide openings in the generator compartment for the following
items (Figure 2.9):
•
Engine exhaust and cooling air outlets
•
Generator cooling air inlet
•
Four holes for passage of generator mounting bolts. See
"Generator Restraint".
DANGER
Fuel lines and exhaust piping must not pen-
etrate into the vehicle living area.
2.3
COOLING AND VENTILATING
AIR
It is absolutely essential that an adequate flow of air for cooling,
ventilating and engine combustion be supplied to the generator set.
Without sufficient airflow, the engine/generator quickly overheats.
Such overheating can cause serious operating difficulties and also
may cause fire and personal injury. The installer must make sure
that sufficient air is available to the generator for cooling, ventilat-
ing and combustion. The installer also must provide for a path for
exhausting the cooling air to the exterior of a compartment, if so
equipped.
DANGER
Never use discharged cooling air for heating or
permit such air to enter the vehicle interior. This
air contains deadly carbon monoxide gas and
other poisonous, flammable or explosive gases.
2.3.1
GENERATOR AIRFLOW
Engine operation drives cooling fans for the two-stage cooling
air system. A pressure fan draws cooling air into the top of the
generator (Figure 2.8). This airflow cools the engine/generator and
electronic components. The second part of the cooling system, a
suction fan, draws air that is heated from a hot engine into a col-
lector pan at the base of the unit. This heated air (although cooler
than exhaust muffler) is then deflected out the bottom toward the
ground.
Figure 2.8 – Airflow Through Engine/Generator
COOLING AIR IN
ENGINE AIR IN
COOLING
AIR OUT
25
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