Generac Power Systems 91355 - Manual (Page 9)

GENERATOR COMPARTMENTS
The generator set may or may not be installed inside
a compartment that is constructed specifically for
housing a generator. This section applies to generator
compartments when they are installed. The following
general rules apply to compartments:
• The generator compartment should be either
constructed of, or lined with, 26 gauge galvanized
steel.
IMPORTANT: ALUMINUM IS NOT AN ACCEPT­
ABLE 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 construct­
ed of 1/2-inch thick plywood, with the floor made
of a double thickness of plywood for added
strength.
• All seams, splices and joints of the compartment
walls (unless vapor tight by design) should be
caulked.
IMPORTANT: CAULKING MUST BE DONE SO
THAT THE CAULKING MATERIAL WILL STAY IN
PLACE PERMANENTLY. PRESSING SUCH MATE­
RIALS AS PUTTY TAPE ONTO JOINTS AND
SEAMS WILL NOT MEET THAT REQUIREMENT. A
HIGH QUALITY SILICONE RUBBER SEALANT IS
RECOMMENDED.
• Holes and openings through the compartment
walls for passage of electrical conduit, conduc­
tors, etc, into vehicle living area must be sealed
vapor-tight with silicone rubber base sealant.
• If you use flexible metal conduit, seal the conduit
at the end where it terminates inside the junction
box. Flexible metal conduit is NOT vapor tight
along its entire length.
• Seams and joints of the galvanized steel
(whether used as a liner or the compartment
itself) must be lapped and mechanically secured.
Such seams may be manufactured, welded, bolt­
ed, riveted, or screwed. Manufactured lock
seams are shown in Figure 7.
Figure 7 — Types of Lock Seams
Fold Locked
Standing
Double Lock
Offset
Double Seam
Acme Lock Gordon Seam Lock Seam
COMPARTMENT SIZE
Plan the compartment size carefully. Provide a mini­
mum of at least 1 inch of clearance between the gen­
erator and compartment walls and 1-1/2 inch of clear­
ance between the generator and the ceiling AFTER
you have lined the compartment with metal, and
AFTER you have installed sound insulation (Figure
8
).
NOTE: Refer to the “Dimensions and Features” draw­
ing in the back of this manual.
P
Figure 8 — Provide Clearance Around Generato
plywood
COMPARTMENT,
1 INCH (2.S4CM)
MINIMUM CLEARANCE
ON ALL SIDES
" INSULATION MSTAL LINING------ '
000*9
COMPARTMENT CONSTRUaiON
The generator compartment should be constructed of 1/2
inch thick plywood. Make the compartment floor a double
thickness of 1/2 inch plywood with the grain of the wood
at cross section for added strength (Figure 9).
Figure 9 — Typical Compartment Construction
Line the entire compartment interior with 26 gauge galva­
nized steel as described above.
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