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Install the unit on a sturdy, level mounting base or platform that will prevent vibration and
sound transmission. Never install the air handler on a wooden or metal platform without
consulting the design engineer for isolation requirements and / or sound control materials.
Do not install the unit near occupied rooms such as offices or guest rooms. Do not attempt to
conserve installation space by fabricating restrictive ductwork with abrupt bends. You may
reduce the operating efficiency and the moisture removal capacity of the air handler. See
section 2.2 or 5.1 for detailed duct installation instructions.
Units located in unconditioned spaces may form condensation on the exterior of the cabinet as
well as in the interior surfaces. Precautions should be taken for indoor units located within
unconditioned spaces to prevent damage resulting from condensation. When the unit is
exposed to low temperatures, the interior surfaces may become cold enough to drop below the
dewpoint. Condensation may then form on the cold interior surfaces and result in water
collecting; this result could be especially problematic in the electrical box. If the unit is located
in either an outdoor space or in a location that is near a doorway or window which may lead to
humid air entering the air handler unit, condensation is possible. In a unit located outdoors,
some condensation will collect on exterior panels.
Do not install an indoor-rated air handler in an outdoor or a wet environment.
If you must install an air handler outdoors you must use an outdoor-rated air handler. Desert
Aire seals and weatherproofs outdoor air handlers to help prevent water infiltration. You can
determine whether your air handler is outdoor-rated by inspecting the unit rating plate. See
section 5.5 for details.
2.2
Duct Installation
Duct design and installation should conform to the latest ASHRAE and SMACNA low velocity
duct standards. See section 5.1 for details. Undersized, restrictive ductwork with abrupt turns
or transitions, can decrease the efficiency and the moisture removal capacity of your unit. Size
the ductwork for an acceptable air pressure drop at the airflow volume of your unit. Use
neoprene flex connectors when you attach ductwork to the unit to prevent transmission of
excess vibration and noise.
Select the grilles, registers and diffusers for low static pressure loss, required throw distance,
and the specified CFM rating. You can find this information in most grille manufacturer's
catalogs. If you are installing the grilles in a corrosive environment, choose components made
from anodized aluminum.
If you must install ductwork in an unconditioned area, use fiberglass duct wrap with vapor
barrier facing. You must install the outdoor air intake away from all sources of airborne
contamination such as exhaust fans or plumbing vents. You can use galvanized sheet metal
ducts for most applications. However, you should use aluminum or stainless steel ducts for
extreme applications such as chemical-laden environments.
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Desert Aire - GreenAire™ Manual
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