Cooling and ventilating air, Generator air flow, Cooling air inlet openings – Generac Power Systems 00862-1 User Manual

Page 22: Generator air flow cooling air inlet openings -21

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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 air flow, the
engine-generator quickly overheats. Such overheating
can cause serious operating difficulties and may also
cause fire and personal injury. The installer must make
sure that sufficient air is available to the generator for
cooling, ventilating and combustion. The installer must
also 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 heat­
ing or permit such air to enter the vehicle interior.

This air contains deadly carbon monoxide gas and
other poisonous, flammable or explosive gases.

GENERATOR AIR FLOW

Engine operation drives cooling fans for the 2-stage

cooling air system. A pressure fan draws cooling air

into the top of generator (Figure 22). This air flow

cools'the engine-generator and electronic compo­
nents. The second part of the cooling system, a suc­
tion fan, draws air that is heated from a hot engine

into a collector pan at the base of the unit. This heat­
ed air (although cooler than exhaust muffler) is direct­
ed across the muffler to cool it. The heated air flow is

then deflected out the bottom toward the ground.

Figure 22 — Air Flow Through Engine-Generator

COOLING AIR INLET OPENINGS

The air inlet opening is illustrated in the compartment
floor cutout in Figure 21. If the vehicle will be parked
on a concrete surface for an extended period of time
with the generator running, an additional air inlet may
be provided in the compartment door as shown in

Figure 23.

NOTE:

Screening, louvers, or expanded metal that

cover air openings restrict air flow that you must com­
pensate for by making the actual air opening propor­
tionately larger. See “Compensating for Restrictions.”

Figure 23 — Air Inlet in Compartment Door

75 SQUARE INCHES
UNRESTRICTED
MINIMUM OPENING

IMPORTANT: BE SURE TO MEET THE MINIMUM

CLEARANCES ILLUSTRATED IN FIGURE 18.

When the unit is installed on a suspended mounting
system, one of several different methods of supplying
air flow may be used as follows:

• Provide a door in the vehicle skirt having an air inlet

opening (Figure 24).

Figure 24 — Suspended Mount: Inlet Door

Using ductwork (Figure 25). The installer must be sure air
is available to the back of the generator since air inlets
are located at the back.

By providing an opening in the vehicle skirt and space
behind the generator for cooling air flow (Figure 26).
Recommended clearance behind the back of the genera­

tor is at least 3 inches.

— 20 —

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