Building Ventilation - LG Multi V mini Engineering Manual

BUILDING VENTILATION

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 human occupants. The five methods that can be
used with Multi V systems to meet the requirements are summarized here.
Note:
Although we believe that building these ventilation methods have been portrayed accurately, none of the methods have been
tested, verifi ed, or evaluated by LG Electronics, USA, Inc. In all cases, the designer, installer, and contractor should under-
stand if the suggested method is used, it is used at their own risk. LG Electronics USA, Inc. takes no responsibility and offers
no warranty, expressed or implied, of merchantability or fi tness 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 Equip-
ment with Reserve Capacity" by John Murphy, published in the ASHRAE Journal, April 2010.
Method 1: Decoupled Dedicated Outdoor Air (DDOAS)
Provide a separate, dedicated outdoor-air system designed to filter, condition, and dehumidify ventilation air and deliver it directly to the condi-
tioned space through a separate register or grille. This approach requires a separate independent ventilation duct system not associated with
the Multi V system.
Note:
In all installations, LG
recommends using
the DDOAS method.
Outdoor Air
Outdoor Air
Unit/ERV
Unit/ERV
48 SYSTEM ENGINEERING
|
Advantages:
Does not add additional heating or cooling loads to indoor units.
May be used with a full lineup of the indoor units.
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 occupied space even when the
Multi V indoor unit fan changes speed or cycles on and off. DDOAS controls do
not have to be interlocked with the Multi V system.
In lieu of installing localized smaller outside air treatment equipment throughout
the building, this method centralizes the ventilation outside air source making
service and filter changes easier and less disruptive for the building occupants.
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.
Ceiling Diffuser
Ceiling Diffuser
Due to our policy of continuous product innovation, some specifications may change without notification.
© LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Disadvantages:
Ceiling space is required
to accommodate ductwork
between the centralized
outdoor air unit and ceiling
diffusers.
Multi V Ceiling Cas-
Multi V Ceiling Cas-
sette Indoor Unit
sette Indoor Unit