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Due to our policy of continuous product innovation, some specications may change without notication.
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FOUR-WAY CASSETTE | 53
Application Guidelines
BUILDING VENTILATION DESIGN GUIDE
Method 4: Coupled Dedicated Outdoor Air (CDOA)
A separate, dedicated outdoor air system delivers air directly to a Duct-Free Split system indoor unit or to the return air duct system. After
mixing with the return air stream, ventilation air passes through the indoor unit and into the conditioned space. The pretreatment system is
capable of filtering, conditioning, and dehumidifying outdoor air to room neutral conditions.
Advantages
• Indoor unit capacity may not need to be
increased because of outdoor air.
• Fan and filter system is centralized to the
main outdoor air unit.
Disadvantages
• Ducted and four-way cassette indoor units are the only models designed for direct
connection of an outside air duct.
• Ceiling space is required for ductwork.
• Failure of outdoor air may impact indoor unit operation.
• In lieu of using the factory mounted return-air thermistor, a remote wall temperature
sensor or zone controller may be required to provide an accurate conditioned space
temperature reading.
Outside air may ow backward through the return air-lter grille when the indoor unit fan speed is reduced or stops when the space load is
satised. This may result in captured particulate on the lter media being blown back into the conditioned space.
Outdoor
Air Unit
Figure 31: Coupled Dedicated Outdoor Air (CDOA).
Methodology illustrations are for examples only and do not depict actual
indoor units for the specic outdoor unit pairing. These are generic illus-
trations to show ventilation design only.
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