2.3.3 COMPENSATING FOR RESTRICTIONS
Such materials as screening, louvers, or expanded
metal can restrict the free flow of air. Compensate for
this restriction by making the actual air opening pro-
Some materials may offer only a 60 percent "free air
inlet area." Other more efficient materials may pro-
vide up to a 90 percent free air inlet area. The per-
centage of free air inlet opening is usually available
from the material supplier or manufacturer.
TO DETERMINE THE ACTUAL AIR INLET OPEN-
ING SIZE REQUIRED, DIVIDE 40 SQUARE INCH-
ES BY THE PERCENTAGE OF FREE AIR INLET
AREA FOR THE MATERIAL USED.
For example: If planning 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 measures 4 inches wide by 12-1/2 inch-
es long provides the required air flow (4 x 12.5 = 50
2.3.4 INVERTER LOCATION
The inverter should be located in a dry, well ventilat-
ed 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 ven-
tilation. IT SHOULD NOT BE LOCATED IN THE
SAME COMPARTMENT AS THE GENERATOR.
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 SUPPLIED sensing harnesses. The DC power
wires may be cut to the required length. Allow enough
length to make connection. Coil excess inside J-Box.
2.3.5 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, enlarge the air openings. Never
place a unit into service until absolutely certain that
cooling and ventilation is adequate.
IMPORTANT: TEST THE INSTALLATION, ESPE-
CIALLY IF BRINGING IN AIR FROM BELOW THE
Section 2 – Installation
IMPACT-36 plus II Recreational Vehicle Generator
PROPANE GAS FUEL SYSTEM
2.4.1 PARTS NOT INCLUDED IN FUEL
The propane fuel system does NOT include such
items as (a) gas tank, (b) gas piping, (c) fittings, (d)
valves, and (e) primary regulator, used to store the
gaseous fuel and deliver it to the gaseous fuel sole-
noid (Figure 2.15).
Figure 2.15 — Diagram of LP Gas System
Use only approved components in the gas
supply system. All components must be prop-
erly installed in accordance with applicable
codes. Improper installation or use of unau-
thorized components may result in fire or an
explosion. Follow approved methods to test
the system for leaks. No leakage is permitted.
Do not allow fuel vapors to enter the vehicle
Power Systems, Inc. 25