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3. AIR DISTRIBUTION SYSTEM
SIZING & DESIGN
The installer of this air conditioner system must design
the air distribution system for his particular application.
Several requirements for this system MUST be met for
the air conditioner to operate properly. These require-
ments are as follows:
A.
Roof cavity thickness must be between 1.75"/
45mm to 4.50"/115mm. This distance is measured
between roof and ceiling surface.
B.
The total cross-sectional discharge area of outlet
ducts from the plenum area under the air condi-
tioner must be a minimum of 17.5 in.2/1 13cm
C.
Duct sizing requirements are as follows:
Duct Depth
Duct Width
Total Duct Length
Duct Length (Short Run)
D.
Register Requirements as follows:
Distance from Duct End
Distance from end of elbow
Distance between registers
Total Registers Required
Number of Registers required
per run
Free Area per Register
E.
The duct material must meet or exceed any agency
Standard that may be in existence at the time the
RV/caravan is produced.
NOTE
IT
THE RESPONSIBILITY OF THE INSTALLER OF
IS
THIS SYSTEM TO INSURE THE DUCTWORK WILL
NOTCOLLAPSEOR BEND DURING OR AFTER THE
INSTALLATION.
DUCTS
MIN.
DEPTH
1-1/4"/32mm
WIDTH
7"/178mm
TOTAL LENGTH
12"/3.7M
AIR CONDITIONER
TOTAL OUTLET
AIR AREA 17.5
2
.
MIN.
MAX.
2 . 2 5 " / m m
1.25"/32mm
7.00"/178mm
- - -
12ft./3.7M
36ft./11 M
1.3 Total Length
MIN.
MAX.
5"/130mm
8"/200mm
15"/380mm
-
-
-
24"/610mm
- - -
4
8
-
-
-
2
2
2
14in.
/90cm
- - -
MAX.
2-1/4"/57mm
-
-
36"/11M
All discharge air ducts must be properly insulated to
F.
prevent condensation from forming on their surfaces
or adjacent surfaces during operation of the air condi-
tioner. This insulation must be R-7 minimum.
G.
Ducts and their joints must be sealed to prevent
condensation from forming on adjacent surfaces dur-
ing operation of the air conditioner.
THE MANUFACTURER WILL NOT BE HELD LIABLE
FOR ROOF STRUCTURAL OR CEILING DAMAGE DUE
TO IMPROPERLY INSULATED OR SEALED
DUCTWORK.
H. Return air opening must have 40 in.
including the air filter.
I.
Return air to the air conditioner must be filtered to
prevent dirt accumulation on air conditioner cooling
surface.
J. Total system pressure must be between:
0.12-0.65
(3.0-l 6.5mm W.C.)
This is to be determined with the air conditioner blower
operating on high speed and return air filter and grill in
place.
IT IS THE RESPONSIBILITY OF THE INSTALLER OF
THIS AIR CONDITIONER SYSTEM TO INSURE THE
STRUCTURAL INTEGRITY OF THE RV ROOF.
K. The thermostat must be located on an inside wall of the
RV/caravan, 54"/1.4M above thefloor.The thermostat
must not be located near a heat source.
4. AIR DISTRIBUTION SYSTEM
INSTALLATION
The Manufacturer recommends the basic configuration
shown below for installing this air conditioner system. We
have found by testing, that this configuration works best in
most applications of this air conditioner system.
REGISTERS
4 MIN. - 8 MAX.
14 SQ. IN./90 SQ.CM FREE AREA PER REGISTER
14 INCH/355mm
ROOF OPENING
ROOF RAFTERS
NOTE
2
/260 cm
2
free area
in.
W.C.
NOTE
SHORT RUN DUCT
1/3 TOTAL DUCT LENGTH
VEHICLE
FRONT
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