Dometic 620515.336, 630515.336 Roof Preparation, Air Grill Perimeter, Standard Genesis Grill

620515, 620525, 620526, 630515 & 630516 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
		Air Grill Perimeter
		1-1/2"	2"
F	17"	1-3/4"		18-1/2"	R
r		14-1/4 x 14-1/4	14-1/4 x 14-1/4		e
o	1-1/4"	(±1/8")	(±1/8")	3"	a
			Opening
n		Opening			r
		3"
t
		1-1/2"	2"
		17"	20-7/8"
		Standard	Genesis
		Grill

C.Roof Preparation

1.Opening Requirements - Before preparing the ceil- ing opening, the type of system options must be decided upon. 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 supplies, fur- nace wiring and a seven-conductor cable, 18 to 22 AWG is to be used for analog thermostat

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