3
caulking 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. If the opening exceeds 15” x 15”, a
mounting frame must be field fabricated to
reduce the opening size (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.
Airxcel’s 48000 series requires that the spacing from
the vehicle roof top to the interior ceiling be no less
than 1”. A typical support frame is shown in Figure 1.
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.
IMPORTANT – Allow 24” 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
interior ceiling of the vehicle (cavity walls).
Additionally, seal the gap around the electrical supply
wiring.
C. 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 3 shows maximum allowable degree
deviations (mounting degrees from total surface flat
plane).
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 2.
D. After the mounting hole area is properly prepared,
remove the carton and shipping pads from the roof
top Heat Pump. Carefully lift the unit to the 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 pointed end (nose)
of the shroud must face towards the front of the
vehicle. Pull the electrical conduit down from the
Heat Pump through the mounting opening and let
hang.
E. Securing the Heat Pump to the Roof - A mounting
frame is supplied with the ceiling assembly.
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