Airxcel 47000 Série Instructions D'installation page 4

If the heat pump is being installed on a low friction roof
surface such as aluminum, steel or gelcoat fiberglass, it is
advisable to order a spring pad kit, part number 8333-3871 to
add "spring pads" to maintain bolt tension and retard lateral
motion of the heat pump which could shear the mounting
bolts.
If the heat pump is being installed subject to heavy lateral
loads, it is advisable to order a "Roughneck" gasket/bolt
package, part number 48207-3301 to maintain bolt tension,
prevent lateral movement of the heat pump and guard against
bolt shear.
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 chalking from around the roof
vent 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 14" x 14", the opening must be
enlarged (See Figure 1).
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. Be careful when
cutting the ceiling opening. 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
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.
The frame must provide an opening 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. This heat pump is to be installed in accordance with
NFPA Standard 501C.
D. The roof top heat pump must be mounted as near
level from front to rear and side to side as is
possible when the vehicle is parked on a level plane.
Figure 2 shows maximum allowable degree
deviations (mounting degrees from total surface flat
plane).
2 ½"
Minimum
Typical Wood Frame
If the roof of the vehicle is sloped (not level) such
that the roof top heat pump cannot be mounted
within the maximum allowable degree deviations, an
exterior leveling shim will need to be added to make
the roof top heat pump level. A typical leveling shim
is shown in Figure 4.
E. After the mounting hole area is properly prepared,
remove the carton and shipping pads from the roof
top heat pump. Carefully lift the unit on top of the
vehicle. Do not use the outer plastic shroud for
lifting. Place the roof top heat pump over the
prepared mounting hole. The sloped end (nose) of
the shroud must face towards the front of the vehicle.
Pull the electrical conduit down from the roof heat
pump through the mounting opening and let hang.
4
Holes For
Wires
14"
1"
Minimum
Thickness
FIGURE 1