Wiring Requirements - Dometic 620515.321 Installation Instructions Manual

The 14-1/4" x 14-1/4" (±1/8") opening is part of the
return air system of the Air Conditioner and must be
finished in accordance with NFPA Standard 501C
Section 2.7.2.
2. Roof Vent Removal
a. Unscrew and remove the roof vent.
b. Remove all caulking compound around open-
ing.
FIG. 5
c. Seal all screw holes and seams where the roof
gasket is located. Use a good grade of all
weather sealant.
d. If the opening exceeds 14-3/8" x 14-3/8", it will
be necessary to install spacers.
e. If the opening is less than 14-1/8" x 14-1/8", it
must be enlarged.
3. New Opening-(Installation Other Than Vent Open-
ing)
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.
d. 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 pro-
vide an entrance hole for power supplies, fur-
nace wiring, 4-conductor control cable, remote
sensor and load shed (Energy Management
System) options as desired.
FIG. 6
Good-Rafters
Do Not Cut Roof
Supported By
Structure Or
Cross Beams
Rafters
3/4" Min.
Leave Access for Power
Supply Wiring
Good Location-
Between Roof
Rafters
Frame Opening So It
Won't Collapse When
Bolting Down
15" min.
620515, 620525, 620526, 630515 & 630516 Installation Instructions
It is the responsibility of the installer of this
air conditioner system to ensure structural
integrity of the RV roof. Never create a low
spot on the roof where water will collect. Wa-
ter standing around the air conditioner may
leak into the interior causing damage to the
product and the RV.
D. Wiring Requirements
1. Route a copper 12 AWG, with ground, 115 VAC
supply line from the 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") opening.
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
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 or battery 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") opening.
b. Make sure that at least 15" of supply wire
extends into the roof opening.
c. In a multiple zone installation, this wiring
is required in only one of the 14-1/4" x 14-
1/4" (±1/8") openings.
3. If a Remote Temperature Sensor is used, the
connector end must be routed to the roof opening of
the system which it will control. Make sure that at
least 15" of the sensor cable extends into the roof
opening. Refer to the Remote Sensor Instructions
for details of the installation.
4. If a furnace is to be controlled by the system, the two
furnace thermostat leads must be routed to the roof
opening of the air conditioner that will control it.
Make sure that at least 15" of the furnace thermo-
stat wires extend into the roof opening.
5. If an Energy Management System (load shed fea-
ture) 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 open relay contact. When the EMS calls
for the compressor to shut off, the relay contacts
should close. Make sure at least 15" of the EMS
wires extend into the roof opening.
5
CAUTION