7
The opening created must be framed to provide
adequate support and prevent air from being
drawn from the roof cavity. Framing stock 407
mm or more in thickness must be used. Remem-
ber to provide an entrance hole for power sup-
plies, indoor temperature sensor (if applicable),
thermostat communication cable, and furnace
wires (if applicable) at the front of the opening.
See (FIG. 5).
3/4″ Min.
Leave Access For
Power Supply Wiring
FIG. 5
15" Min. At
Front Of
Opening
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
19 mm Min.
C. Air Distribution Duct Sizing & Design
The installer of this system must design the air distribution
system for their particular application. Several requirements
must be met for the unit to operate properly. These require-
ments are as follows:
1.
Make sure ductwork will
NOT
bend or collapse during and after installation,
and that it is correctly insulated and sealed.
Otherwise, damage to roof structure and ceiling
could occur.
2. All discharge air ducts must be properly insu-
lated to prevent condensation from forming on
their surfaces or adjacent surfaces during op-
eration of unit. This insulation must be R-7 mini-
mum. See (FIG. 6).
Frame
Duct
Duct
Frame
Frame
Roof Opening
Roof Opening
AC Power
Supply Wire
Low Voltage Wires:
12 Vdc
Furnace
Indoor Temperature
Sensor Cable
Control Wires
Roof
SIDE VIEW
(TOWARD BACK OF RV
Duct
Ceiling
Duct
Insulation
TOP VIEW
(BACK OF RV)
FIG. 6
3. Ducts and their joints must be sealed to prevent
condensation from forming on adjacent surfaces
during operation of the unit.
4. Return air openings must have 40 square inches
minimum free area including the filter.
5.
Return air to the unit must be filtered to prevent
dirt accumulation on unit cooling surface.
6. Air Distribution System Installation
a. Dometic Corporation recommends the basic
configuration shown in (FIG. 7), for installing
this system. We have found by testing, that
this configuration works best in most applica
-
tions. It is the responsibility of the installer to
review each RV floor plan to determine the
following:
●
Duct size
●
Duct layout
●
Register size
●
Register location
●
Thermostat location
●
Indoor Temperature Sensor Location
These items must be determined in conjunc-
tion with the Air Distribution Duct System
Sizing & Design requirements. See "C. Table
- Air Distribution Duct Sizing & Design" on
page (5).
Alternate configurations and methods
may be used which will allow the unit
to operate properly; however, these
alternate configurations and methods
MUST
be approved by Dometic Cor-
poration in writing. The following in-
structions are based upon the use of
RAG Kits 3105007.XXX & 3105935.
XXX.
INSTALLATION INSTRUCTIONS
