620515, 620525, 620526, 630515 & 630516 Installation Instructions
4. Air Distribution System Sizing & Design
CAUTION
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.
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
c.Ducts and their joints must be sealed to prevent condensation from forming on adjacent sur- faces during operation of the air conditioner.
d.Returnairopeningsmusthave40squareinches 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
AIR DISTRIBUTION
DUCT SIZING & DESIGN CHART
Return Air Cover Model | 3105007 | 3308120 |
| 3105935 | Genesis Air Filtration System |
|
|
|
Roof Cavity Depth | 2.0 In. Min. - | 2.0 In. Min. - |
|
|
|
Duct Cross Sectional Area | 21.0 Sq. In. Min. | 32.0 Sq. In. Min. |
|
|
|
Duct Size |
|
|
Depth | 2.0 In. Min. - | |
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.
6
