Dometic 630025.331 C.Roof Preparation, 7-1/8”, 4-1/8”, 21-3/8”, Rear, Center Line, of Unit

630025.331 Installation Instructions

FIG. 4	4"		4"
	7-1/8”
4-1/8”		21-3/8”	REAR
			OF
			UNIT
	14-1/4" x 14-1/4”	Center Line
	(±1/8”) OPENING	of Unit
	7-1/8”
KEEP THESE AREAS			12"
FREE OF OBSTRUCTIONS

	2 7/8	+-1/8
4		4
		2 7/8

C.Roof Preparation

1.Opening Requirements - Before preparing the ceil- ing opening, read all of the following instructions before beginning the installation.

If a roof vent opening will not be used 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 reinforcing members.

There may be electrical wiring between the roof and the ceiling. Disconnect 120 volt AC power cord and the positive (+) 12 volt DC ter- minal at the supply battery. Failure to follow this instruction may create a shock hazard causing death or severe personal injury.

The 14-1/4" x 14-1/4" (±1/8") opening is part of the return air system of the Air Conditioner and must be finished in accordance with NFPA Standard 501C Section 2.7.2.

2.Roof Vent Removal

a.Unscrew and remove the roof vent.

b.Remove all caulking compound around open- ing.

c.Seal all screw holes and seams where the roof gasket is located. Use a good grade of all weather sealant. See FIG. 5.

FIG. 5

d.If the opening exceeds 14-3/8" x 14-3/8", it will be necessary to re-size the opening to 14-1/4" x 14-1/4" (±1/8").

e.If the opening is less than 14-1/8" x 14-1/8", it must be enlarged.

3.New Opening- (Installation Other Than Vent Open- ing)

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

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

c.The opening created must be framed to provide adequate support and prevent air from being drawn from the roof cavity. Lumber 3/4" or more in thickness must be used. Remember to pro- vide an entrance hole for power supply.

FIG. 6
Do Not Cut	Good-Rafters	Good Location-
Roof Structure	Supported By	Between Roof
Or Rafters	Cross Beams	Rafters
3/4" Min.	Frame Opening So It
	Won't Collapse When
	Bolting Down Unit
		15" Min. At
Leave Access For Power		Front Of
Supply Wiring		Opening

CAUTION

It is the responsibility of the installer of this air conditioner system to ensure structural integrity of the RV roof. Never create a low spot on the roof where water will collect. Wa- ter standing around the air conditioner may leak into the interior causing damage to the product and the RV.

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