Multi F Outdoor Unit Engineering Manual

ASHRAE Standards 62.1 and 62.2 (depending on if the building is residential or commercial), and local codes specify the minimum volume
of airflow 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. Indoor units located within the zone typically require less airflow to condition the space. During the
design phase, refer to the airflow capabilities listed in the specification tables for each product. Choose the best method for the application
out of the five (5) ventilation options available.
Disclaimer
Although we believe that these building ventilation methods have been portrayed accurately, none of the methods have been tested, veried, 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 tness of purpose if this method fails to perform as stated or intended.
• For a complete copy of ASHRAE Standard 62.1 and 62.2, refer to the American Standard of Heating and Air Conditioning Engineers
(ASHRAE) website at www.ashrae.org.
Method 1: Natural Ventilation (Non-Ducted, Unconditioned Outdoor Air)
Natural ventilation devices, such as operable windows or louvers may be used to ventilate the building when local code permits.
Advantages
•Occupants control the volume of the ventilation air manually.
•Useful for historic buildings that have no ceiling space available for
outdoor air ductwork.
•May be used with the full lineup of Multi F indoor units.
Disadvantages
•In some locations, it may be difficult to control humidity levels when
windows are open.
•Thermal comfort levels may be substandard when windows are
open.
•Indoor units may have to be oversized to account for the added
heating and cooling loads when windows are open.
•Provides outdoor air to perimeter spaces only. Additional mechani-
cal ventilation system may be required to satisfy requirements for
interior spaces.
•Outdoor air loads may be difficult to calculate since the quantity of
outdoor air is not regulated.
•May affect indoor unit proper operation when open.
Figure 39: Natural Ventilation (Non-Ducted, Unconditioned Outdoor Air).
BUILDING VENTILATION DESIGN GUIDE
Due to our policy of continuous product innovation, some specications may change without notication.
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186 | ApplicAtion Guidelines
Multi F and Multi F MAX Heat Pump System Engineering Manual
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