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620515, 620525, 620526, 630515 & 630516 Installation Instructions
6
It is the responsibility of the installer to insure
the ductwork will not collapse or bend during
and after the installation. Dometic Corporation
will not be liable for roof structural or ceiling
damage due to improperly insulated, sealed
or collapsed ductwork.
CAUTION
Return Air Cover Model 3105007 3308120
3105935 Genesis Air Filtration System
Roof Cavity Depth 2.0 In. Min. - 5-1/2 In. Max. 2.0 In. Min. - 5-1/2 In. Max.
Duct Cross Sectional Area 21.0 Sq. In. Min. 32.0 Sq. In. Min.
Duct Size
Depth 1-1/2 In. Min. - 2-1/2 In. Max. 2.0 In. Min. - 2-1/2 In. Max.
Width 7.0 In. Min. - 10.0 In. Max. 8.0 In. Min. - 10.0 In. Max.
Total Duct Length 15.0 Ft. Min. - 40.0 Ft. Max. 15.0 Ft. Min. - 40.0 Ft. Max.
Duct Length (short run) 1/3 Total Duct Length 1/3 Total Duct Length
Center Duct System (Only)
Depth 2.0" In. Min. - 2.0" Max.
Width 8.0 In. Min. - 8.0 In. Max.
Total Duct Length 15.0 Ft Min. - 40 Ft. Max.
Duct Length (Short Run) 1/3 Total Length
Register Requirements
Number Required Per Run 4 Min. 4 Min.
Register Free Air Area 14.0 Sq. In. 14.0 Sq. In.
Distance From Duct End 5.0 In. Min. - 8.0 In. Max. 5.0 In. Min. - 8.0 In. Max.
Distance From Elbow 15.0 In. 15.0 In.
Duct Static
Blower at High Speed,
Filter & Grill In Place 0.12 - 0.65 In. W.C. 0.12 - 0.65 In. W.C.
Note: Duct sizes listed are inside dimensions.
AIR DISTRIBUTION
DUCT SIZING & DESIGN CHART
4. Air Distribution System Sizing & Design
The Installer of this air conditioner system must
design the air distribution system for their particular
application. Several requirements for this system
MUST be met for the air conditioner to operate
properly. These requirements are as follows:
a. The duct material must meet or exceed any
agency or RVIA Standard that may be in exist-
ence at the time the RV is produced.
b. All discharge air ducts must be properly insu-
lated to prevent condensation from forming on
their surfaces or adjacent surfaces during op-
eration of the air conditioner. This insulation
must be R-7 minimum.
c. Ducts and their joints must be sealed to prevent
condensation from forming on adjacent sur-
faces during operation of the air conditioner.
d. Return air openings must have 40 square inches
minimum free area including the filter.
e. Return air to the air conditioner must be filtered
to prevent dirt accumulation on air conditioner
cooling surface.
5. Air Distribution System Installation
a. Dometic Corporation recommends the basic
configuration shown on page 7, for installing
this air conditioner system. We have found by
testing, that this configuration works best in
most applications of this air conditioner sys-
tem. It is the responsibility of the Installer of this
system to review each RV floor plan and deter-
mine the following:
• Duct size
• Duct layout
• Register size
• Register location
• Thermostat location