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These bolts must pass through (a) the generator mounting base, (b) the compartment floor (if a compartment is used) and (c) the supporting framework (Figure 2.3). All bolts must be long enough so that when tight, at least three threads are visible past the retaining lock nuts. Refer to Section 2.2 for the location of the generator mounting holes. Figure 2.3 - Typical Generator Restraint 1/2 INCH THICK 2.2 GENERATOR COMPARTMENTS Whether the generator set is being installed inside a compartment specifically manufactured to house a generator or inside a compartment that the installer constructs, the compartment MUST meet certain specifications as outlined in the following sections: ♦ 2.2.1 COMPARTMENT SIZE_ Plan the compartment size carefully. Provide a minimum clearance of 1/2 inch (13 mm) on the front and top, 1 inch (25 mm) on the sides, and 1/2 inch (13 mm) from the back for air circulation AFTER the compartment has been lined with metal and sound insulation (Figure 2.4). NOTE: Refer to “Figure 1.2 - Major Features and Dimensions” on Page 21. Figure 2.4 - Clearances • 2.2.2 COMPARTMENT CONSTRUCTION • The generator compartment should be either constructed of, or lined with, 26-gauge galvanized steel. NOTE: Aluminum is NOT an acceptable alternative to galvanized steel due to aluminum’s low melting point. • If the compartment is lined with galvanized steel, it may be constructed of any material. Generac recommends that the compartment be constructed of 1/2-inch thick plywood (not strandboard), with the floor made of a double thickness of 1/2-inch plywood with the grain of the wood at cross section for added strength (Figure 2.5). Figure 2.5 - Typical Compartment Construction CROSS-SECTION VIEW METAl LINING • If constructing a compartment, line the exterior (underside) of the compartment floor with 26-gauge galvanized steel. • All seams, splices and joints of the compartment walls (unless vapor tight by design) should be caulked to prevent poisonous, flammable or explosive vapors from entering the vehicle interior. NOTE: Caulking must be done so that the caulking material will stay in place permanently. Pressing such materials as putty tape onto joints and seams is NOT acceptable. A high quality silicone rubber base sealant is recommended. • Holes and openings made in the compartment walls to allow for the passage of electrical conduit, conductors, hoses, cables, etc., into the vehicle living area must be sealed vapor tight with silicone rubber base sealant. Generac® Power Systems, Inc. S3 INSTALLATION Section 2 - Installation PRIMEPACT 50 Recreational Vehicle Generator 8 If flexible metal conduit is used, it must be sealed internally at the end where it terminates inside the compartment’s electrical junction box. NOTE: Flexible metal conduit, due to its unique construction, is NOT vapor tight along its entire length. • Seams and joints of the galvanized steel (whether used as a liner or for the compartment itself) must be lapped and mechanically secured. Such seams may be manufactured, welded, bolted, riveted or screwed. Manufactured lock seams are shown in Figure 2.6. Installer constructed compartments typically utilize a standard lap joint. Figure 2.6 - Types of Lock Seams ACME LOCK DOUBlfLOCK OOÜBiiSÉAM ■HHBBHHHI I 1 I I li- ll GORDON SEAM I LOCK SUM STANDARD LAP JOINT • After the compartment has been metal lined and vapor sealed, line the compartment interior walls and ceiling with an approved, nonflammable sound insulating material. See Section 2.2.3. —AIBfflA- A Do not install any flammable material directly above or around the compartment. Heat, transferred through the compartment structure, may be sufficient to ignite, char or discolor seat cushions, fiberboard and other flammable materials. You may need to use approved nonflammable insulating materials in high temperature areas. ♦ 2.2.5 SOUND INSULATING MATERIALS Once installers have determined that a compartment is properly constructed and metal lined, they can add acoustical material. This may include additional sealant or insulating material, to reflect noise away from the vehicle interior. Sound insulating materials should be of a nonflammable type. One excellent insulating material is a 1-inch (25 mm) thick fiberglass having a 2-pound density. When fiberglass is used, its coated side should face toward the compartment interior. S4 Generac* Power Systems, Inc. n_ n fl FOLD LOCKED STANDING I I ® I flEE «ET —a m a— A Do not install sound insulation or any absorbent material on the compartment floor interior. Such materials will become soaked with combustible or explosive vapors and liquids and will become a fire hazard. Using a combination of sound insulating materials can often reduce noise more effectively than a single material. For example, a sheet of lead or visco-elastic material, along with a layer of other acoustical material, is more effective than when a single material is used. • 2.2.4 ACO...
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