Dometic Brisk Air Installation And Operation Manual page 14

Pre-installation
2. Unscrew and remove the roof vent.
3. Remove the caulking compound around the
opening.
4. Seal the screw holes and seams where the roof
gasket will be located. Use a good grade of
all-weather sealant.
5. Measure the roof opening (review "Placement
Requirements" on page 9). If the roof opening is
within specifications, skip to "Routing the wiring" on
page 15.
6. If the opening needs to be resized, proceed to
"Making a new roof opening" on page 14:
– If the opening exceeds 14.4 x 14.4 in.
(366 x 366 mm), it will be necessary to reduce the
size the opening.
– If the opening is less than 14.1 x 14.1 in.
(358 x 358 mm), it ill be necessary to enlarge the
opening.
7 .2 .2 Making a new roof opening
I If the roof has an existing roof vent, see "Using an
existing roof vent opening" on page 13.
This section describes how to prepare the RV roof when
making a new roof opening.
1. Shut off the gas supply, disconnect the 115 VAC
power from the RV, and disconnect the positive (+)
12 VDC terminal from the supply battery.
2. Carefully mark the required roof opening. See
"Placement Requirements" on page 9.
14
Rooftop Air Conditioner (Universal Air Distribution Box, Mechanical Controls)
15 Structure for a new roof opening
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3. Make sure the new opening does not compromise
the roof's structural integrity.
– Do not cut the roof structure or the rafters.
– The rafters should remain supported by a cross
beam.
– The opening should be between the rafters.
4. Carefully cut the required roof opening.
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EN