Generac Power Systems 009600-5, 009734-5 6.3COOLING AND VENTILATING AIR, Generator Airflow

Section 6 – Installation

PRIMEPACT 66G and 66LP Recreational Vehicle Generators

◆6.2.5 COMPARTMENT FLOOR CUTOUTS

You must provide openings in the generator compart- ment for the following items (Figure 6.8, Page 25):

•Engine exhaust and cooling air outlets

•Generator cooling air inlet

•Four holes for passage of generator mounting bolts. See Section 6.1.4 (Page 23).

Fuel lines and exhaust piping must not penetrate into the vehicle living area.

◆6.3.2 COOLING AIR INLET OPENINGS

The minimum size of the air inlet opening, whether the generator is housed in a conventional compartment or not, is at least 100 square inches (see Figure 6.10). This rule applies whether inlet air is brought in through an opening in the compartment door, an opening in the vehicle skirt, through ductwork, or by any other means.

NOTE:

Screening, louvers or expanded metal that cover air openings restrict airflow. You must compensate for this by making the actual air opening proportionate- ly larger. See Section 6.3.3 (Page 27).

6.3COOLING 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, ventilating and combustion. The installer also must provide for a path for exhausting the cooling air to the exterior of a compartment, if so equipped.

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.

◆6.3.1 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 6.9). 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 collector 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 6.9 – Airflow Through Engine/Generator

Figure 6.10 – Air Inlet in Compartment Door

NOTE:

Be sure to meet the minimum clearances illustrated in Figure 6.4 (Page 23).

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

•Provide a door in the vehicle skirt having an air inlet opening (Figure 6.11).

Figure 6.11 – Suspended Mount: Inlet Door

• Using ductwork (Figure 6.12, Page 27). The installer must be sure air is available to the top of the genera- tor since air inlets are located at the top.

• By providing an opening in the vehicle skirt and space

26 Generac® Power Systems, Inc.