atwood Air Conditioners (non-ducted AC-1351, AC-1501) - Manual (Page 3)

AC IOM 3/01/2013 rev 1 3
Unit Installation (Non-Ducted)
Before beginning, mark out the position of the
unit considering the following important
requirements:
- The air conditioner should be situated as
centrally as possible on the vehicle, to ensure
even air distribution.
- The front of the unit MUST face the direction of
travel; failure to follow this instruction will result
in damage to the condenser fans.
-
If the vehicle is over 23’ in length, or has an
unusually high heat load (see General Operating
Information section regarding expectations
about insulation etc.), Atwood recommends 2 or
more units to cool effectively.
- When considering the installation position
remember to check for clearance around the
plenum inside the vehicle.
- Avoid an installation position where a
bulkhead, cupboard or light fitting could interfere
with the discharge air flow from the plenum.
It is important that the unit is never more
than 5° from the horizontal and the rear of
the unit should never be higher than the front.
- Contact Atwood if your installation differs
significantly.
ASSESS ROOF STRENGTH
- The roof members MUST be strong enough to
support the weight of the unit 99 lbs (45kg)
without any roof deflection that will cause
“pooling” of water around the unit. Contact your
RV manufacturer to confirm the max load the
roof is able to handle. If in any doubt consider
the use of an external “H” frame.
- If the roof does not have an existing hole
one must be cut. Cut from the roof then use the
roof hole as a guide to cut through the ceiling.
Contact your RV manufacturer for the best
method to cut through the roof.
-
The square hole in the roof (14” x 14”) MUST
be boxed up with minimum 3/4 inch square
timber to provide a structure strong enough to
withstand the compression of the installation
bolts. This is also to ensure that air in not drawn
from the roof cavity (Fig 3 & 4). Remember to
leave access for wiring.
- Longitudinals MUST be fixed securely to the
transverse roof members to transfer load
(see Fig 3).
There may be electrical wiring located between the roof and
ceiling. Ensure that power is properly disconnected at the
supply (mains and/or battery). Failure to do so may result in
personal injury or death
TIP: Always use crawl boards across the roof to avoid damage
POSITION UNIT ON ROOF
- Remove the air conditioner from the carton.
- Position the unit over the gasket so that
the corners of the square hole in the RV roof line up with the corners
of the square hole underneath the air conditioner (Fig 6). TIP: Have
one person inside the RV looking through the hole while the other
is on the roof adjusting the position of the unit.
CAUTION
WARNING