Selecting An Installation Location 3 V; Installing The Rooftop Unit - Airxcel Maxxair 44000 Serie Instrucciones De Instalación, Operación Y Mantenimiento

III. SELECTING AN INSTALLATION
LOCATION
®
Your MAXXAir heat pump has been designed
for use primarily in recreational vehicles.
Is the roof of the vehicle capable of supporting
both the roof top unit and ceiling assembly
without additional support structures? Inspect
the interior ceiling mounting area to avoid
interference with existing structural members
such as: bunks, curtains, tracks or room
dividers. The depth of the ceiling assembly
shroud is 51mm. Be sure to check clearance
to doors which must be swung open
(refrigerator – closets - cabinets).
Most of the time, roof mount heat pumps are
installed at existing roof vent locations. If
there is no roof vent (existing mounting hole),
the following placement locations are
recommended.
Motorhomes – a single unit or the forward of
two units should be mounted within 2.7m of
the driver compartment.
Caravans or Mini-Homes – a location should
be selected that is near the door slightly
forward of the vehicle center length.
Vans – location should be in the center of the
roof (side to side – front to back).
Truck with Camper – location should be
between 1.2 and 1.5m from the rear of the
camper to achieve maximum cooling effect.
IV.

INSTALLING THE ROOFTOP UNIT

DANGER
SHOCK HAZARD
DISCONNECT ALL POWER TO THE
VEHICLE BEFORE PERFORMING ANY
CUTTING TO THE VEHICLE. CONTACT
WITH HIGH VOLTAGE CAN RESULT IN
EQUIPMENT DAMAGE, PERSONAL
INJURY OR DEATH.
IMPORTANT
TO PREVENT DAMAGE TO THE WIRING
AND BATTERY, DISCONNECT THE
BATTERY CABLE FROM THE POSITIVE
BATTERY TERMINAL BEFORE
PERFORMING ANY CUTTING TO THE
VEHICLE.
Once the location for your heat pump has
been determined (See Section III), a
reinforced and framed roof hole opening must
be provided (may use existing vent hole).
Before cutting into the vehicle roof, verify that
the cutting action will clear all structural
members and crossbeams. Additionally, the
location of any inner roof plumbing and
electrical supplies must be considered.
A. If a roof vent is already present in the
desired mounting location for the heat
pump, the following steps must be taken.
1. Remove all screws which secure the
roof vent to the vehicle. Remove the
vent and any additional trim materials.
Carefully remove all caulking from
around the roof opening to obtain
clean exterior roof surface.
2. It may be necessary to seal some of
the old roof vent mounting screw holes
which may fall outside of the heat
pump basepan gasket.
3. Examine the roof opening. If the
opening is smaller than dimensions
shown in the chart in Figure 1, the
opening must be enlarged.
B. If a roof vent opening is not used, a new
opening (See Figure 1) will have to be cut
into the vehicle roof. A matching opening
will also have to be cut into the interior
vehicle ceiling. If the ceiling opening is
carpeted, snagging could occur. After the
opening in the roof and interior ceiling are
the correct size, a framed support
structure must be provided between the
exterior roof top and interior ceiling.
The reinforced framed structure must
provide the following guidelines:
1. Capable of supporting both the weight
of the roof top heat pump and the
interior ceiling assembly.
2. Capable of holding or supporting the
roof outer surface and interior ceiling
apart, so that when the roof top heat
pump and ceiling assembly are bolted
together, no collapsing occurs.
Airxcel, Inc. recommends that the spacing
from the vehicle roof top to the interior ceiling
top be no less than 25mm. A typical support
frame is shown in Figure 1.
The frame must provide an opening through
the frame to allow passage for the power
supply wiring.
Route the supply wiring through the frame at
the same time the support frame is being
installed.
C. The heat pump must be mounted as near
level front to rear and side to side as
possible when the vehicle is parked level.
Figure 2 shows the maximum allowable
degree deviations.
IMPORTANT – Allow 600mm of supply
wiring through the support frame (working
length).
After the support frame is installed, seal off
all gaps between the frame and both the
roof exterior and the supply wiring.
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