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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.
There may be electrical wiring between the
roof and the ceiling. Disconnect 120 VAC
power cord and the positive (+) 12 VDC ter-
minal at the supply battery. Failure to obey
this instruction may create a shock hazard
causing death or severe personal injury.
2. Mark a 14-1/4" x 14-1/4" (±1/8") square on the roof
and carefully cut the opening. The 14-1/4" x 14-1/4"
(±1/8") opening is part of the return air system of
the unit and must be finished in accordance with
ANSI A119.2.
3. Using the roof opening as a guide, cut the matching
hole in the ceiling.
4. 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, 3 conductor
cable, and furnace wiring (if applicable).
FIG. 3
Good-Rafters
Do Not Cut Roof
Supported By
Structure Or
Cross Beams
Rafters
3/4" Min.
Leave Access For Power
Supply Wiring
It is the responsibility of the installer of this
system 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.
Good Location-
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
15" Min. At
Front Of
Opening
D. Wiring Requirements
1. Route a copper, with ground, 120 VAC supply
wire from the time delay fuse or circuit breaker
box to the roof opening. The proper size wire can
be determined from chart on page 3.
a. This supply wire 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 an appropriately
sized separate time delay fuse or circuit
breaker. The proper size protection can be
determined from the chart on page 3.
c. Make sure that at least 15" of supply wire ex-
tends into the roof opening. This insures an
easy connection at the junction box.
d. Wiring must comply with the National Electri-
cal Code ANSI/NFPA-70 and CSA Standard
C22.1 (latest edition) and any State or Local
Codes or regulations.
e. Protect the wire where it passes into the
opening with approved method. See para-
graph "d" above.
2. Route a dedicated 12 VDC supply wire (18-22
AWG) from the RV's converter (filtered side) or
battery to the roof opening.
a. This supply wire must be located in the front
portion of the 14-1/4" x 14-1/4" (±1/8") open-
ing.
b. Make sure that at least 15" of supply wire ex-
tends into the roof opening.
3. Route a 3 conductor cable, 18 to 22 AWG, from
the Single Zone LCD (hereinafter referred to as
SZLCD) thermostat mounting position into the
14-1/4" x 14-1/4" (±1/8") roof opening. Make sure
that at least 15" of the wire extends into the roof
opening and 6" extend from the wall at the mount-
ing position of the SZLCD thermostat. See Sec-
tion E.
4. If system includes a gas furnace, route two 18
gauge thermostat wires from the furnace to the
roof opening of the unit that will control it. If more
than one furnace is to be used, route the second
set of thermostat wires to the second unit. Make
sure that 15" of wire extends into the opening.
E. Choosing Thermostat Location
The proper location of the thermostat is very impor-
tant to ensure that it will provide a comfortable RV
temperature. Observe the following rules when se-
lecting a location:
1. Locate the thermostat 54" above the floor.
2. Install the thermostat on a partition, not on an out-
side wall.
3. NEVER expose the thermostat to direct heat from
lamps, sun or other heat producing items.
4. Avoid locations close to doors that lead outside,
windows or adjoining outside walls.
5. Avoid locations close to supply registers and the
air from them.
5
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