Accessories 65
Mechanical accessories
6RWU0-06A
PTAC
(b) Architecture Grille.
1) Remove the cardboard stiffener and rear enclosure panel
from the sleeve. These items may be removed from the
inside of the room.
2) The Grille is installed in such a way that it could be
removed through the rear end of the sleeve.
3) Install the Grille by aligning the four screws supplied to
their corresponding holes in the architecture grille.
4) Secure the Grille to the sleeve by tightening the four
screws to their corresponding holes in the Grille.
5) Remove the wire handle from the center of the Grille prior
to installing the chassis into the sleeve.
The architectural design of a building may dictate the use of special or oversized louvers for aesthetic reasons. Louvers
other than standard LG exterior grilles may be used on the LG unit, however, these special louvers, or any special exterior
architectural treatments of the building facade that may restrict the free circulation of condenser airflow, should be referred
to LG Engineering for evaluation and approval. The following guidelines should be followed in selecting a louver:
1.
The louver must have a minimum of 65% free area.
ASHRAE defines free area as the minimum area of the opening in an air inlet or outlet through which air can pass.
Percent (%) free area equals the X dimension divided by the Y dimension.
2. The louver should be attached to the wall case in a manner that will prevent recirculation of condenser discharge air into
the air inlet. If the louver is not attached directly to the wall case, a field-supplied splitter or gasket is required between the
chassis and the louver to prevent recirculation. It is important that the above criteria be followed since a louver that is too
restrictive or allows recirculation will reduce the unit’s capacity and efficiency, increase the electrical current draw, cause
intermittent operation due to the compressor overload protector shutting the compressor off, and cause failure of the com-
pressor overload and shorten compressor life. Using the unit with a grille that is too restrictive or allows recirculation
may
constitute improper installation and will void the unit's warranty.
A scale drawing of the louver section should be
sent to LG Engineering Team. To assure the proper performance of the LG unit and comply with Underwriters
Laboratories requirements, it may be necessary to send a sample louver section (at least 16" x 42") to an independent
lab to be tested with the LG unit.
Sample Calculations
Free Area (%)=
x 100
x= 1”
y= 1.5”
y
x
F.A %=
x 100= 66.7%
1.5
1
