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Resumen del manual
. 2.2.3 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. NOTE: 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 2.5, Page 25): • Use 5/8-inch thick or 3/4-inch thick plywood in the compartment. • Construct the compartment floor of a double thickness of 5/8-inch or 3/4-inch plywood. • Line the compartment’s 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 acoustical materials, as mentioned in Section 2.2.2. 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. • Line the compartment door interior (except for air openings) with suitable, fireproof sound insulation (such as, 1-inch (25 mm) thick fiberglass with a 2pound density). 24 Generac® Power Systems, Inc. Generac® Power Systems, Inc. 25 Figure 2.5 – Typical Noise Abatement 2.2.4 COMPARTMENT FLOOR CUTOUTS You must provide openings in the generator compartment for the following items (Figure 2.6): • Engine exhaust and cooling air outlets • Generator cooling air inlet and front service door • Four holes for passage of generator mounting bolts. See Section 2.1.4 (Page 23) • Rear service door. Fuel lines and exhaust piping must not penetrate into the vehicle living area. Section 2 – Installation QUIETPACT™ 65D Recreational Vehicle Generator Figure 2.6 – Compartment Floor Cutout 26 Generac® Power Systems, Inc. 2.3 COOLING AND VENTILATING AIR It is absolutely essential that an adequate flow of air for cooling, ventilation, 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 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. 2.3.1 GENERATOR AIRFLOW This unit uses an impellar fan located on the alternator drive pulley to cool the alternator’s internal components. Air is drawn through the alternator and expelled radially behind the drive pulley. An enginedriven centrifugal blower draws in cooling air through air inlet openings, moves that air around the engine/generator and across the radiator, then discharges that air out the bottom (see Figure 2.7). Figure 2.7 – Airflow Through Engine/Generator 2.3.2 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 150 square inches (975 cm2) (see Figure 2.8). 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 proportionately larger. See Section 2.3.3 (Page 27). Figure 2.8 – Air Inlet in Compartment Door 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 2.9). Figure 2.9 – Suspended Mount: Inlet Door • Use ductwork (Figure 2.10, Page 27). The installer must be sure air is available to the sides of the generator for proper air intake. • Provide an opening in the vehicle skirt and space around the generator for cooling airflow (Figure 2.11, Page 27). Recommended clearance around all sides of the generator is at least 2 inches (50 mm). Section 2 – Installation QUIETPACT™ 65D Recreational Vehicle Generator Generac® Power Systems, Inc. 27 Figure 2.10 – Air Inlet Using Ductwork Figure 2.11 – Air Inlet in Vehicle Skirt 2.3.3 COMPENSATING FOR RESTRICTIONS Materials, such as, screening, louvers, or expanded metal, can restrict the free flow of air. Compensate for this restriction by making the actual air opening proportionately larger. Some materials may offer only a 60 percent “free air inlet area.” Oth...