Building Ventilation Design Guide - LG LAU090HYV Engineering Manual

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
accomplishing this with LG Single Zone Inverter Wall Mounted 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., In all cases, the designer, installer, and contractor should understand if the suggested method is used,
it is used at their own risk. LG Electronics U.S.A., Inc., takes no responsibility and offers 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
conditioned space through a separate register or grille. This approach requires a separate independent ventilation duct system not
associated with the Single Zone Inverter system (Figure 7).
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 systems.
• The outdoor air unit may supply "neutral" air to the occupant space
even when the Single Zone Inverter (indoor) unit fan changes
speed or cycles on and off. DDoAS controls do not have to be
interlocked with the Single Zone Inverter 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.
Outdoor Air
Outdoor Air Unit / ERV
Due to our policy of continuous product innovation, some specifications may change without notification.
building VEntilation dESign guidE
• 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.
Figure 7: Decoupled Dedicated outdoor Air System (DDoAS)
Ceiling Diffuser
Intake Grill
Wall Mount Inverter
APPLICATIOn GUIDeLIneS | 33