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building vEntilation dESign guidE
building ventilation design guide
ASHRAE 62.1 and local codes specify the minimum volume of outdoor air that must be provided to an occupied space. outdoor air is
required to minimize adverse health effects, and it provides acceptable indoor air quality for building occupants. The three methods of ac-
complishing this with LG DFS Single Zone Art Cool Mirror systems are summarized here.
disclaimer
Although we believe that these building ventilation methods have been portrayed accurately, none of the methods have been
tested, verified, or evaluated by LG Electronics, U.S.A., Inc.
stand that if the suggested method is used, it is used at their own risk. LG Electronics U.S.A., Inc., takes no responsibility and of-
fers no warranty, expressed or implied, of merchantability or fitness of purpose if this method fails to perform as stated or intended.
• For a complete copy of Standard 62.1-2010, refer to the American Standard of Heating and Air Conditioning Engineers (ASHRAE)
website at www.ashrae.org.
• For more information on how to properly size a ventilation air pretreatment system, refer to the article, "Selecting DOAS Equipment with
Reserve Capacity" by John Murphy, published in the ASHRAE Journal, April 2010.
Method 1: decoupled dedicated outdoor air System (ddoaS)
Provide a separate, dedicated outdoor-air system designed to filter, condition, and dehumidify ventilation air and deliver it directly to the con-
ditioned space through a separate register or grille. This approach requires a separate independent ventilation duct system not associated
with the DFS Single Zone Art Cool Mirror system (Figure 11).
LG recommends using the DDOAS method in all installations.
Advantages
• Does not add additional heating or cooling loads to indoor units.
• May be used with all Single Zone Art Cool Mirror systems.
• If the outdoor air unit fails, the resulting untreated air will be readily
noticed by the occupants.
• The outdoor air unit may supply "neutral" air to the occupant space
even when the DFS Single Zone indoor unit fan changes speed or
cycles on and off. DDoAS controls do not have to be interlocked
with the Single Zone Art Cool Mirror system.
• In lieu of installing localized smaller outside air treatment
equipment throughout the building, this method centralizes the
ventilation air source making service and filter changes easier and
less disruptive for the building occupants.
Figure 11: Decoupled Dedicated outdoor System Diagram
Outdoor Air
Outdoor Air Unit / ERV
40 | APPLICATIon GuIdeLIneS
In all cases, the designer, installer, and contractor should under-
• Indoor unit operation and performance will not be affected by the
condition of outdoor air.
• Third-party demand control ventilation controls are more readily
accommodated.
disadvantages
• Ceiling space is required to accommodate ductwork between the
centralized outdoor air unit and ceiling diffusers.
Methodology illustrations are for examples only and do not depict actual
indoor units for the specific outdoor unit pairing. These are generic ilustra-
tions to show ventilation design only!
Due to our policy of continuous product innovation, some specifications may change without notification.
Ceiling Diffuser
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