LC097HV4 User Manual

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Due to our policy of continuous product innovation, some specications may change without notication.

50 | FOUR-WAY CASSETTE

Four-Way Ceiling Cassette System 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 express, implied, or statutory and

the implied warranties of merchantability and tness for a particular purpose are excluded should the building ventilation methods fail 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. The open

area of a window or the free area of a louver must meet the minimum percentage of the net occupied floor area.

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 Duct-Free Split system 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 mechan-

ical 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 28: Natural Ventilation (Non-Ducted, Unconditioned Outdoor Air).

BUILDING VENTILATION DESIGN GUIDE

Methodology illustrations are for examples only and do not depict actual

indoor units for the specic outdoor unit pairing. These are generic illus-

trations to show ventilation design only.

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User Manual - Page 50