5
C. Roof Preparation
1.
Opening Requirments - Before preparing the ceiling
opening, the type of system options must be de-
cided upon. If a remote sensor is to be used,
provision must be made for it. If the load shed option
is to be used, wires must be run from the load shed
control to the Dometic A/C. If a furnace is to be
connected, wires must be run from the furnace to the
Dometic A/C. Read all of the following instructions
before beginning the installation.
If a roof vent opening will not be used a 14-1/4" x 14-
1/4" (±1/8") opening must be cut through the roof and
ceiling of the RV. This opening must be located
between the roof reinforcing members.
There may be electrical wiring between the
roof and the ceiling. Disconnect 115 volt AC
power cord and the positive (+) 12 volt DC ter-
minal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
620515, 620525, 620526, 630515 & 630516 Installation Instructions
AIR CONDITIONER DIMENSIONS
(On Top of Vehicle)
FIG. 4
The 14-1/4" x 14-1/4" (±1/8") opening is part of the
return air system of the Air Conditioner and must be
finished in accordance with NFPA Standard 501C
Section 2.7.2.
Do Not Cut
Roof Strucure
Or Rafters
Good-Rafters
Supported By
Cross Beams
Good Location-
Between Roof
Rafters
2.
Roof Vent Removal
a.
Unscrew and remove the roof vent.
b.
Remove all caulking compound around open-
ing.
c.
Seal all screw holes and seams where the roof
gasket is located. Use a good grade of all
weather sealant.
d.
If the opening exceeds 14-3/8" x 14-3/8", it will
be necessary to install spacers.
e.
If the opening is less than 14-1/8" x 14-1/8", it
must be enlarged.
3.
New Opening-(Installation Other Than Vent Open-
ing)
a.
Mark a 14-1/4" x 14-1/4" (±1/8") square on the
roof and carefully cut the opening.
b.
Using the roof opening as a guide, cut the
matching hole in the ceiling.
d.
The opening created must be framed to provide
adequate support and prevent air from being
drawn from the roof cavity. Lumber 3/4" or more
in thickness must be used. Remember to pro-
vide an entrance hole for power supplies, fur-
nace wiring, 4-conductor control cable, remote
sensor and load shed (Energy Management
System) options as desired.
3/4" Min.
Leave Access For
Power Supply Wiring
Frame Opening So It
Won't Collapse When
Bolting Down
15" min.
1-1/4"
1-1/2"
1-3/4"
1-1/2"
17"
17"
20-7/8"
3"
2"
2"
18-1/2"
3"
Air Grill Perimeter
14-1/4 x 14-1/4 (±1/8")
Opening
Genesis
FIG. 5
FIG. 6
