Pre-Installation; Determining Your Cooling Needs; Preparing The Rv Roof Opening - Dometic Brisk II Installation And Operation Manual

Pre-installation

7 Pre-installation

WARNING: FIRE OR ELECTRICAL SHOCK
HAZARD . Failure to obey these warnings
could result in death or serious injury .
• Shut off the gas supply, disconnect the 115 VAC
power from the RV, and disconnect the positive
(+) 12 VDC terminal from the supply battery before
drilling or cutting into the RV.
• Make sure there are no obstacles such as wires or
pipes inside the RV's roof.
• Provide grounding in compliance with all applicable
electrical codes.

CAUTION: LIFTING HAZARD .
Use proper lifting technique and control when
lifting the rooftop component. Two people are
required to lift the rooftop component to the roof.
Failure to obey this caution could result in minor or
moderate injury.
NOTICE: Failure to follow these notices could
result in damage to the rooftop component and/
or the RV .
• Never create a low spot on the RV roof.
• Maintain the structural integrity of the RV roof. The
roof must be designed to support 130 lbs (59 kg)
when the RV is in motion. Normally, a 200 lb (91 kg)
static load design will meet this requirement.
• Read this entire section before beginning the
installation.
This section describes how to install and set up the unit.

7 .1 Determining your cooling needs

When determining your cooling requirements, consider
the following items:
• The size of the RV
• The RV window area (which could increase heat gain)
• The amount of insulation in the walls and the roof
• The geographical location where the RV will be used
• The personal comfort level required
12
Rooftop Air Conditioner (Air Distribution Box, Mechanical Controls)

7 .2 Preparing the RV roof opening

NOTICE: The roof opening must be structurally framed
to provide adequate support and to prevent air from
being drawn from the roof cavity. Framing stock with
0.75 in. (19 mm) or more thickness must be used.
Remember to provide an entrance hole for power
supplies at the front of the opening. See Figure 12.
This section describes how to prepare the RV roof
opening.
7 .2 .1 Using an existing roof vent opening
If the roof does not have an existing roof vent, skip
I
to "Making a new roof opening" on page 12.
This section describes how to prepare the RV roof when
using an existing vent.
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. 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 13.
6. If the opening needs to be resized, proceed to
"Making a new roof opening" on page 12.
– If the opening exceeds 14.4 x 14.4 in.
(366 x 366 mm), it will be necessary to reduce the
size of 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
If the roof has an existing roof vent, see "Using an
I
existing roof vent opening" on page 12.
This section describes how to prepare the RV roof when
making a new roof opening.
EN