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c. Check inside the RV for return air kit obstruc-
tions (i.e. door openings, room dividers, cur-
tains, ceiling fi xtures, etc.) See FIG 2.
FIG. 2
22"
2-1/2"
Perimeter Of Air Box
2-7/8"
Front
20"
3-7/8"
11"
C. Roof Preparation
1. Opening Requirements - Before preparing the ceil-
ing opening, the type of system options must be
decided upon. Read all of the following instructions
before beginning the installation.
A 14-1/4" x 14-1/4" (±1/8") opening must be cut
through the roof and ceiling of the RV. This open-
ing must be located between the roof reinforcing
members.
The 14-1/4" x 14-1/4" (±1/8") opening is part of the
return air system of the unit and must be fi nished
in accordance with NFPA Standard 501C Section
2.7.2.
There may be electrical wiring between the
roof and the ceiling. Disconnect 120 volt AC
power cord and the positive (+) 12 volt DC
terminal at the supply battery. Failure to follow
this instruction may create a shock hazard
causing death or severe personal injury.
2 New Opening
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.
20"
Dimensions Are Nominal
14-1/4" x 14-1/4" (±1/8")
Opening
Center Line Of
Opening
3-7/8"
11"
641515, 641516, 641535, 651515 & 651516 Installation Instructions
c. 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 provide an entrance hole for power sup-
plies, furnace wiring, 4-conductior control
cable, remote sensor and load shed (Energy
Management System) options as desired. See
FIG. 3.
FIG. 3
Do Not Cut
Roof Struc-
ture Or Raf-
3/4" Min.
Leave Access For Power
Supply Wiring
It is the responsibility of the installer of this
unit to ensure structural integrity of the RV
roof. Never create a low spot on the roof where
water will collect. Water standing around the
unit may leak into the interior causing damage
to the product and the RV.
D. Wiring Requirements
1. 120 VAC Supply Line
Route a copper 12 AWG, with ground, 120 VAC
supply line from the time delay fuse or circuit breaker
box to the roof opening.
a.
This supply line must be located in the front
portion of the 14-1/4" x 14-1/4" (±1/8") open-
ing.
b.
The power MUST be on a separate 20 Amp
time delay fuse or HACR circuit breaker.
c.
Make sure that at least 15" of supply wire
extends into the roof opening. This ensures
and easy connection at the junction box.
d.
Wiring must comply with all National, State
and Local Wiring Codes.
e.
Use a steel sleeve and a grommet or equivalent
methods to protect the wire where it passes
into the opening.
2. Route a dedicated 12 VDC supply line (18-22
AWG) from the RV's converter (fi ltered terminals)
or battery to the roof opening.
4
Good-Rafters
Good Location-
Supported By
Between Roof
Cross Beams
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
15" Min. At
Front Of
Opening
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