Dometic 3300 Manuel D'installation Et D'utilisation page 10

Installation
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7 Structural Integrity for the Roof
Incorrect installation
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Make sure the roof opening does not compromise the
structural integrity of the roof or wall.
• Do not cut the structure or the rafters.
• The rafters should remain supported by a cross beam.
• The roof opening should be between the rafters.
3 .4 Framing the Roof or Wall
Opening
If the roof is corrugated or not level, complete this
section to create a level platform or contact a qualified
service professional.
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8 Frame for a Roof Opening
0.75 in.
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(25 mm)
10
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Correct installation
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0.25 in. (6 mm) Opening for
the Power Supply Wiring
1. Build a frame for the vent opening to provide a level
platform for securing the mounting flange to the roof.
2. Leave access for the power supply wiring to pass into
the interior through the frame.
3 .5 Connecting the Power
I If you are replacing an existing vent fan, use the
existing wiring only if it meets the Recreation
Vehicle Industry Association's 16 AWG wiring and
location requirements.
This section describes how to connect the vent fan to a
12 VDC power source.
1. Locate the nearest 12 VDC power source wiring.
2. To avoid blowing the fuse, test the power source
wiring for polarity.
a. Turn on the 12 VDC power or battery.
b. Using a multimeter, touch the red lead to the
positive source. At the same time, touch the black
lead to the neutral or negative wire. A correct
polarity will display +12 or more volts. If incorrect,
the multimeter will display -12 volts or more.
c. Turn off the 12 VDC power or battery.
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9 Power Supply at the Roof Opening
6 in. (152 mm) minimum
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3. Route the power source wiring to the roof or wall
opening. Add an additional 15 in. (381 mm) of
wire, to ensure an easy connection to the vent
fan. If necessary, extend the vent fan's wiring using
the additional lengths of black and white wiring
provided.
Fan-Tastic Vent Fan
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EN