Generac Power Systems 00862-2 - Manual (Page 25)

Section 2 - Installation INSTALLATION
Series QP55-C Recreational Vehicle Generator
2.2 GENERATOR COMPARTIVIENTS
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 min­
imum 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 -
Dimensions” on Page 21. Major Features and
Figure 2.4
-
Clearances
♦ 2.2.2 COMPARTMENT CONSTRUaiON * •
• The generator compartment should be either
constructed of, or lined with, 26-gauge galva­
nized 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 construct­
ed of 1/2-inch thick plywood (not strandboard),
with the floor made of a double thickness of 1/2-
inch pl}nvood with the grain of the wood at cross
section for added strength (Figure 2.5).
Figure 2.5 - Typical Compartment Construction
CROSS-SECTION VIEW 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 mate­
rial 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 con­
duit, conductors, hoses, cables, etc., into the
vehicle living area must be sealed vapor tight
with silicone rubber base sealant.
• 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 con­
struction, 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, riv­
eted or screwed. Manufactured lock seams are
shown in Figure 2.6. Installer constructed com­
partments typically utilize a standard lap joint.
Generac* Power Systems, Inc. S3