Dometic B3351.531 Operations Instructions download pdf (Page 5)

INSTALLATION AND OPERATING INSTRUCTIONS

ROOF PREPARATION

A. ROOF VENT REMOVAL:

1. Unscrew and remove the roof vent.

2. Remove all caulking compound around opening.

3. Seal all screw holes and seams where the roof

gasket will be located. Use a good grade of all

weather sealer.

B. NEW OPENING:

(Installations Other Than Vent Openings)

FIG. 4

Rear

Unit

194mm

360mm x 360mm

Opening

460

75mm

285

510mm

194mm

133

378

Front

Unit

1. A 360mm x 360mm opening must be cut through the

roof and ceiling of the RV. It is recommended this

opening be located between roof reinforcing mem-

bers.

2. Mark a 360mm x 360mm square on the roof and

carefully cut the opening.

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

hole in the ceiling. See FIG. 4.

5. Route a copper 1.5mm

with ground, supply line

from the fuse or circuit breaker box to the roof

opening.

a. The power supply must be on a appropriately

fused circuit.

360

FIG. 5

20mm

Min.

Frame

Opening

Provide

Hole For

Wiring

90mm

360x 360mm

Cut Out

FIG. 6

There may be electrical wiring between the

roof and the ceiling. Disconnect 220-240volt

AC power cord and the positive (+) 12 volt

DC terminal at the supply battery. Failure to

follow this instruction may create a shock

hazard causing death or severe personal in-

jury.

WARNING

C. OPENING PREPARATION:

1. If the opening exceeds 365mm x 365mm, it will be

necessary to install spacers.

2. If the opening is less than 355mm x 355mm, it must

be enlarged.

3. The opening must be framed to provide adequate

support and prevent air from being drawn from the

roof cavity. Lumber 20mm thick or more and long

enough to bridge the opening must be used. Re-

member to provide an entrance hole for the power

supply wire. See FIG. 5.

4. In addition to the frame, the opening must be

reinforced with (10 mm or more thick) strips of

plywood at least 90mm wide around all 4 sides of the

cut out hole. This will help provide strength to accept

the wood screws needed to secure the air box. The

strips must be glued in place onto the ceiling

material. See FIG. 6.

It is the responsibility of the installer of this air

conditioner system to ensure structural in-

tegrity of the RV roof. Never create a low spot

on the roof where water will collect. Water

standing around the air conditioner may leak

into the interior causing damage to the prod-

uct and the RV.

CAUTION

1 2 3 4 5 6 7 8 9 10 11

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Dometic B3351.531 Operations Instructions Page 5

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