9
3. The location of the unit on the roof should be such as to provide proper access for
inspection and servicing (Figure 3).
IMPORTANT: If unit will not be put into service immediately, cover supply and return
openings to prevent excessive condensation.
VII.DUCTWORK
Ductwork should be fabricated by the installing contractor in accordance with local codes
and NFPA90A. Industry manuals may be used as a guide when sizing and designing the
duct system - contact Air Conditioning Contractors of America, 1513 16th St. N.W.,
Washington, D.C. 20036.
Place the unit as close to the space to be air conditioned as possible allowing clearance
dimensions as indicated. Run ducts as directly as possible to supply and return outlets.
Use of non-flammable waterproof flexible connectors on both supply and return connec-
tions at the unit to reduce noise transmission is recommended.
It is preferable to install the unit on the roof of the structure if the registers or diffusers
are located on the wall or in the ceiling. Consider a slab installation when the registers
are low on a wall or in the floor.
On ductwork exposed to outside air conditions of temperature and humidity, use a mini-
mum of 2" of insulation and a vapor barrier. Distribution system in attic, furred space or
crawl space should be insulated with at least 2" of insulation with vapor barrier. One-half
to 1" thickness of insulation is usually sufficient for ductwork inside the air conditioned
space.
Provide balancing dampers for each branch duct in the supply system. Properly support
the ductwork from the structure.
FIGURE 2
PACKAGE AIR CONDITIONER
OUTSIDE SLAB INSTALLATION, BASEMENT OR
CRAWL SPACE DISTRIBUTION SYSTEM
FIGURE 3
PACKAGE AIR CONDITIONER
PITCHED ROOFTOP INSTALLATION, ATTIC
OR DROP CEILING DISTRIBUTING SYSTEM.
MUST BE MOUNTED LEVEL.
!
WARNING
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT RETURN DUCTWORK TO
ANY OTHER HEAT PRODUCING DEVICE SUCH AS A FIREPLACE INSERT,
STOVE, ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN FIRE,
CARBON MONOXIDE POISONING, EXPLOSION, PROPERTY DAMAGE,
SEVERE PERSONAL INJURY OR DEATH.
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