Dometic FreshJet 3 Series Installation And Operation Manual page 11

Rooftop Air Conditioner (Air Distribution Box, Electronic Controls)
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 10.
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 7.
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w
e
6 Structure for a new roof opening
Incorrect
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Correct
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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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Correct
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7 Structural framing for a new roof opening
0.8 in. (20 mm)
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Minimum width for the
framing stock
0.3 in. (8 mm)
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Minimum width for
access hole
5. Frame the opening so it will not collapse when
bolting the rooftop component down.
6. At the front of the frame opening, leave or create
an access hole to allow for the length of exposed
115 VAC power supply wiring required to complete
the installation.
7. Using the roof opening as a guide, cut a matching
hole in the ceiling of the RV interior.
7 .3 Routing the supply wiring to the
roof opening
The power must be on an appropriately-sized
I
separate time-delay fuse or circuit breaker. See
"Specifications" on page 8.
This section describes how to route the wiring for the
rooftop component.
Pre-installation
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15.0 in. (381 mm)
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Exposed length
of 115 VAC power
supply wire
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