Installation Procedure; Choosing Proper Location For Unit; Roof Preparation - Dometic 640315 series Installation Instructions Manual

INSTALLATION PROCEDURE

A.

Choosing Proper Location For Unit

This unit is specifically designed for installation on the roof
of a recreational vehicle (RV). When determining your
cooling requirements, the following should be considered:
● Size of RV;
● Window area (increases heat gain);
● Amount of insulation in walls and roof;
● Geographical location where the RV will be
used;
● Personal comfort level required.
1. For one unit installation: The unit should be
mounted slightly forward of center (front to back)
and centered from side to side.
2. For two unit installations: Install one unit 1/3 and
one unit 2/3's from front of RV and centered from
side to side.
It is preferred that the unit be installed on a relatively flat
and level roof section measured with the RV parked on a
level surface, but up to a 8° tilt is acceptable.
3. After Location Has Been Selected:
a. Check for obstructions in the area where unit
will be installed. See (FIG. 1).
Dimensions Are Nominal
FIG. 1
12"
Center Line Of Unit
4"
b.  Maintain structural integrity.
Otherwise damage to product and/or RV
could occur.
The roof must be designed to support 130
pounds when the RV is in motion. Normally
a 200 lb. static load design will meet this re-
quirement.
c. Check inside the RV for return air grille ob-
structions (i.e. door openings, room divid-
ers, curtains, ceiling fixtures, etc.). See
(FIG. 2).
9-1/2"
Keep These Areas
Free Of Obstructions
Front
4"
Roof Opening
FIG. 2
3/4"
17"
1-1/4"
B.

Roof Preparation

1.   FIRE OR ELECTRICAL SHOCK
HAZARD. Verify there are no obstacles inside
RV's roof and/or walls (wires, pipes, etc.). Shut
OFF gas supply, disconnect 120 Vac power from
RV, and disconnect positive (+) 12 Vdc terminal
from supply battery BEFORE drilling or cutting
into RV. Failure to obey these warnings could
result in death or serious injury.
 O pening Requirements - Before preparing
the ceiling opening, the type of system op-
tions MUST be decided upon. Read all of
the following instructions before beginning
the installation.
2. Carefully mark and cut the required roof opening.
See "B. Roof Requirements" on page (4).
3. Using the roof opening as a guide, cut the match-
ing hole in the ceiling.
4.  Maintain structural integrity. Oth-
erwise damage to product and/or RV could oc-
cur.
 NEVER create a low spot on RV
roof. Otherwise, water will pool and could cause
a leak.
The opening created must be framed to provide
adequate support and prevent air from being
drawn from the roof cavity. Framing stock 3/4"or
more in thickness must be used. Remember to
provide an entrance hole for power supplies, in-
door temperature sensor cable (if applicable),
4 conductor communication cable, and furnace
wiring (if applicable). See (FIG. 3).
5
Dimensions Are Nominal
17"
17"
1-1/2"
Roof Opening
1-3/4"
1-1/2"
17"