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MECHANICAL SPECIFICATIONS
microprocessor. Operating schedules are stored in select models of
the optional, wall-mounted, local, or central controller.
For heat pump systems, heated or cooled air delivery is dependent
upon outdoor unit operating mode. In Heating mode, the
microprocessor control will activate indoor unit operation when the
indoor room temperature falls below setpoint temperature. At which
point, a signal is sent to the outdoor unit to begin the heating cycle.
The indoor unit fan operation is delayed until coil pipe temperature
reaches 76°F. Significant airflow is generated when pipe temperature
reaches 80°F. The unit is equipped with an infrared receiver
designed to communicate with an LG wireless remote controller.
In lieu of wireless remote or factory return air thermistor, screw
terminals on the microprocessor circuit board accommodate various
models of wall-mounted local controllers and/or a wall-mounted
remote temperature sensor. The unit microprocessor is capable of
accepting space temperature readings concurrently or individually
from either:
1. Wall-mounted wired controller(s)
2. Factory mounted return air thermistor or the optional wall
mounted wired remote temperature sensor.
The indoor units are Wi-Fi compatible with the addition of an LG Wi-
Fi module accessory, and can be controlled by LG's ThinQ™ app on
a smart device. A field-supplied Wi-Fi network and smart device are
required. The ThinQ app is free, and is available for Android™ and
iOS. (Android is a trademark of Google LLC.)
Architectural Panel / Air Filter — TP-B Frame for 3 x3
24,000 Btu/h Indoor Units; TM-A Frame for 3 x3 36,000
Btu/h and 42,000 Btu/h Indoor Units
The unit case allows access to hanger rods and the inspection of
piping through corner access panels on the architectural panel. The
optional auto-elevating panel kit is designed to provide motorized
ascent/descent of the return air panel/pre-filter assembly a distance
of up to 12 feet allowing easy access to remove and clean the filter.
The kit consists of two lifting mechanisms comprised of an electric
motor driven winch with four (4) braided steel lifting cables.
The winch kit is mounted behind the panel and is not visible
during normal unit operation. The auto-elevating return air panel
appearance and finish matches that of the architectural panel on
similar indoor unit models equipped with the standard hinged filter
panels. The auto-elevating panel control algorithm accepts up, down,
and stop control commands from either a wall-mounted or the lift
remote controller. The algorithm does not permit the lowering of
the panel while the indoor unit fan is operating. The pair of winch
controllers work in unison to keep the return air panel level during lift
and descent operations and will automatically stop the descent of the
return air panel/filter if contact is made with any obstacle.
10 | PRODUCT DATA
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Btu/h Indoor Units
The architectural panel has four-directional slot diffusers each
equipped with independent dual-vane oscillating motorized
guide vanes designed to change the angle airflow is discharged.
Discharge range of motion is 10° to 85° in an up/down direction.
A control algorithm provides the capability of locking each guide
vane independently in a field adjusted fixed position. Guide vanes
provide airflow in all directions. The ends of each vane are tapered
to provide airflow to the space in the direction of the four corners of
the architectural panel.
Filters
Return air is filtered with a factory-supplied, removable, washable
Indoor Units
The case has a factory designated cutout for the connection of a
field-supplied outside air duct. An optional flange kit is available from
LG.
Indoor Units
The case has a factory designated cutout for the connection of a
field-supplied outside air duct. LG offers two flange kits.
Supply Air Branch Duct Connections
Factory designated cutouts are marked on the unit case. Branch
ducts provide the designer with the ability to duct up to 1/2 the unit
airflow capacity to adjacent spaces. The adjacent space must be
in the room where the ceiling cassette is installed. It cannot be
branched to another room.
Condensate Lift / Pump
The indoor unit is provided with a factory installed and wired
condensate lift/pump capable of providing a maximum 27-9/16 inch
(9,000, 12,000, and 18,000 Btu/h) or 31-1/2 inch (24,000, 36,000,
and 42,000 Btu/h) lift from the bottom surface of the unit. Drain pump
has a safety switch to shut off the indoor unit if the condensate rises
too high in the drain pan.
Condensate Drain Pan
The condensate drain pan is constructed of EPS (expandable
polystyrene resin).
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