5
C. Roof Preparation
1. Opening Requirements - Before preparing the
ceiling opening, the type of system options must
be decided upon. Read all of the following instruc
-
tions before beginning the installation.
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 ac
-
cordance with ANSI A 119.2.
3. Using the roof opening as a guide, cut the match-
ing 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"
thick or more must be used. Remember to pro
-
vide an entrance hole at the front of the opening
for power supplies, indoor temperature sensor (if
applicable), communication cable, and furnace
wiring (if applicable). See FIG. 3.
SHOCK HAZARD. There may be electrical
wiring between the roof and the ceiling. Dis-
connect 120 VAC power supply and the posi-
tive (+) 12 VDC terminal at the supply battery.
Failure to obey this warning may cause death
or severe personal injury.
Do Not Cut Roof
Structure Or
Rafters
Good-Rafters
Supported By
Cross Beams
Good Location-
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down Unit
Leave Access For Power
Supply Wiring
15" Min. At
Front Of
Opening
3/4" Min.
FIG. 3
PROPERTY DAMAGE HAZARD. It is the re-
sponsibility 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. Failure to obey this warning may cause
water damage to the product and the RV.
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 the 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 at least 15" of supply wire extends
into the roof opening. This insures an easy
connection at the junction box.
d. Wiring
MUST
comply with 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.
Note:
When a Comfort Control Center (hereinafter re-
ferred to as CCC) thermostat is being installed with mul
-
tiple zones, this 12 VDC supply wire needs to be supplied
to the unit designated zone 1 only.
Note:
When a Comfort Control Center 2 (hereinafter
referred to as CCC 2) thermostat is being installed with
more than 2 zones, route a dedicated 12 VDC supply wire
(18-22 AWG) to zone 1 and zone 3 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 an indoor temperature sensor (Optional)
from the roof opening to the indoor temperature
sensor location. The 2 pin connector end goes to
the roof opening. See indoor temperature sensor
installation instructions for proper sensor loca-
tion.
4. Thermostat Control Cable
a. CCC, CCC 2 & Digital thermostat.
i. Route a 4 conductor communication ca-
ble from the 14-1/4" x 14-1/4" (±1/8") roof
opening to the thermostat mounting loca-
tion.
Review section E "Choosing Ther-
mostat Location" before routing com-
munication cable.
Choose the shortest
most direct route. Make sure that at least
15" of wire extends into the roof opening
and 6" extends from the wall at the thermo-
stat mounting location.
