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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 follow
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
NFPA Standard 501C Section 2.7.2.
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. Lumber 3/4" or more
in thickness must be used. Remember to provide
an entrance hole for power supplies, remote tem-
perature sensor cable, 4 conductor communication
cable, and furnace wiring.
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 120 VAC copper 12 AWG, with ground,
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 time de-
lay fuse or HACR circuit breaker. The proper
protection can be determined from the chart
on page 3.
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 NFPA 70: National
Electrical Code regulations and any State or
Local Codes or regulations.
e.
Protect the wire where it passes into the open-
ing with approved method. See paragraph "d"
above.
2. Route a dedicated 12 VDC supply line (18-22 AWG)
from the RV's converter (filtered side) or battery to
the roof opening.
Note: If more than 2 zones exist, route a dedicated 12
VDC supply line (18-22 AWG) to zone 1 and zone 3 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. Make sure that at least 15" of supply wire
extends into the roof opening.
3. Route a remote temperature sensor (a remote
temperature sensor is required for the system to
operate) from the roof opening to the remote tem-
perature sensor location. The 2 pin connector end
goes to the roof opening. See remote temperature
sensor installation instructions for proper sensor
location.
4. Route a 4 conductor communication cable from
the Comfort Control Center 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 mounting position of the Comfort
Control Center thermostat. See Section E-1.
5. If a furnace is to be controlled by the system, the
two furnace thermostat leads must be routed to the
roof opening of the unit that will control it. Make
sure that at least 15" of the furnace thermostat wire
extends into the roof opening.
6. If an Energy Management System (load shed
feature) is to be used with the control, two wires
must be routed to the roof opening of the zone to
be managed. The signal required for this function
is normally an open relay contact. When the EMS
calls for the compressor to shut off, the relay con-
tacts should close. Make sure at least 15" of the
EMS wire extends into the roof opening.
5
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