Generac Power Systems 00862-2 - Manual (Page 28)

INSTALLATION
Section 2 - Installation
Series QP55-G Recreational Vehicle Generator
DANGER
A 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, flam­
mable 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 2.9). This airflow
cools the engtne/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 then
deflected out the bottom toward the ground.
Figure 2.9
-
Airflow Through Engine/Generator
Figure 2.10
-
Air Inlet in Compartment Door
♦ 2.5.2 COOLING AIR INLET OPENINGS
The minimum size of the air inlet opening, whether
the generator is housed in a conventional compart­
ment or not, is at least 100 square inches (see
Figure 2.10). This rule applies whether inlet air is
brought in through an opening in the compartment
door, an opening in the vehicle skirt, through duct­
work, or by any other means.
NOTE:
Screening, louvers or expanded metal that cover
air openings restrict airflow. You must compen­
sate for this by making the actual air opening pro­
portionately larger. See Section 2.3.3 (Page 27).
100 SQUARE INCHES
UNRESTRICTED
MINIMUM OPENINGS
NOTE:
Be sure to meet the minimum clearances illus­
trated in Figure 2.4 (Page 23).
When the unit is installed on a suspended mount­
ing system, one of several different methods of sup­
plying airflow may be used as follows:
• Provide a door in the vehicle skirt having an air
inlet opening (Figure 2.11).
Figure 2.11 - Suspended Mount: Inlet Door
Using ductwork (Figure 2.12, Page 27). The
installer must be sure air is available to the
top of the generator since air inlets are located at
the top.
By providing an opening in the vehicle skirt and
space behind the generator for cooling airflow
(Figure 2.13 Page 27). Recommended clearance
behind the back of the generator is at least
1/2 inch (13 mm).
SB Generac* Power Systems, Inc.