Dometic 3308120.XXX AIR Distribution System Installation, Duct Sizing Requirements AS Follows

3308120.XXX GENESIS AIR FILTRATION SYSTEM

C. DUCT SIZING REQUIREMENTS AS FOLLOWS:

NOTE: Duct sizes listed are inside dimensions.
		Min.	Max.
1.	Duct Depth	2.00"	2-1/2"
2.	Duct Width	8.00"	10.00"
3.	Total Duct Length	15'	40'
4.	Duct Length (Short Run)	1/3 Total Length
CENTER DUCT (Penguin 620 & 630 Series Only
	Controls In Roof Package)
		Min.	Max.
1.	Duct Depth	2.00"	2.00"
2.	Duct Width	8.00"	8.00"
3.	Total Duct Length	15'	40'
4.	Duct Length (Short Run)	1/3 Total Length

D.REGISTER REQUIREMENTS AS FOLLOWS:

Min. Max.

1.	Distance from Duct End	5"	8'
2.	Distance from End of Elbow	15"	—
3.	Distance between Registers	24”	—
4.	Total Number Required	8	12
5.	Min. No. required per Run	2	—
6.	Min. Free Area per Register	14 sq. in.	—

E.The Duct material must meet or exceed any agency or RVIA Standard that may be in existence at the time the RV is produced.

F.All Discharge Air Ducts must be properly insulated to prevent condensation from forming on their surfaces or adjacent surfaces during operation of the air conditioner/ heat pump. This insulation must be R-7 minimum.

G.Ducts and their joints must be insulated and sealed to prevent condensation from forming on adjacent surfaces during operation of the air conditioner/heat pump.

CAUTION

It is the responsibility of the installer to in- sure the ductwork will not collapse or bend during and after the installation. Dometic Corporation will not be liable for roof struc- tural or ceiling damage due to improperly insulated, sealed or collapsed ductwork.

H.Return Air to the air conditioner/heat pump must be filtered to prevent dirt accumulation on air conditioner/ heat pump cooling surface.

I.Total System Static Air Pressure

This is to be determined with the air conditioner/heat pump blower operating on High Speed and return air filter and grill in place. It is measured in inches of water Column.

0.55- 0.90 In. W.C. 579 Series

0.40- 1.10 In. W.C. 590, 591, 595 Series

0.12- 0.65 In. W.C. 600, 630 Series

4.AIR DISTRIBUTION SYSTEM INSTALLATION

Dometic Corporation recommends the basic configuration shown in FIG. 1 for installing this air conditioner/heat pump system. We have found by testing, that this configuration works best in most applications of this air conditioner/heat pump system.

It is the responsibility of the Installer of this system to review each RV floor plan and determine the following:

A.Duct size

B.Duct layout

C.Register size

D.Register locations

E.Thermostat location.

These items must be determined in conjunction with the Air Distribution System Sizing and Design Requirements listed in Section 3 of this manual.

Important: Alternate configurations and methods may be used which still allow the air conditioner/heat pump to operate properly. However, these alternate configurations and methods must be approved by Dometic Corporation in writing.

The following instructions are based upon the use of Dometic Genesis Air Filtration System No. 3308120.XXX.

A.Before preparing the ceiling opening, the type of system options must be decided upon. Read all of the instruc- tions packaged with the system options before beginning the installation.

B.ROOF AND CEILING OPENING PREPARATION

1.A 14-1/4" x 14-1/4" (±1/8") opening must be cut through the roof and ceiling of the RV. This opening must be located between the roof and reinforcing members.

!WARNING

There may be electrical wiring between the roof and the ceiling. Disconnect 115 volt AC power cord and the positive (+) 12 volt DC terminal at the supply battery. Failure to fol- low this instruction may create a shock haz- ard causing death or severe personal injury.

2.Mark a 14-1/4" x 14-1/4" (±1/8") square on the roof and carefully cut the opening.

3.Using the roof opening as a guide, cut the matching hole in the ceiling.

4.The opening created must be framed and sealed to provide adequate support and prevent air from being drawn from the roof cavity. Lumber 3/4" or more in thicknessmust be used. Remember to provide an entrance hole for power supplies and system wires as needed.

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