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MECHANICAL SPECIFICATIONS
Four-Way Ceiling Cassette System
Figure 71: Four-Way Ceiling Cassette
System (LC367HV, LC427HV Models).
Coil
Outdoor Unit
Heat pump outdoor unit coils are made of nonferrous louvered
aluminum fins protected with an integral coil guard. The coil for each
outdoor unit has a minimum of 14 fins per inch (FPI); heat exchanger
has two rows. The coil fins have a factory applied corrosion resistant
GoldFin™ material with hydrophilic coating tested in accordance with
ASTM B-117 salt spray test procedure for a minimum of 1,000 hours.
Coils are factory tested to a pressure of 551 psig.
Indoor Unit
Indoor unit coils are factory built and are comprised of aluminum fins
mechanically bonded to copper tubing. Each indoor unit has a min-
imum of two rows of coils, which are pressure tested to 551 psig at
the factory. Each unit is provided with a factory installed condensate
drain pan below the coil.
Fans and Motors
Outdoor Unit
The 9,000 Btu/h (LUU097HV), 12,000 Btu/h (LUU127HV), 18,000
Btu/h (LUU187HV), and 24,000 Btu/h (LUU247HV) outdoor units
include one direct drive, variable speed axial / propeller type fan with
a horizontal air discharge; the 36,000 Btu/h (LUU367HV) and 42,000
Btu/h (LUU427HV) include two fans. Fan blades are made of Acry-
lonitrile Butadiene Styrene (ABS) material, and have a Brushless
Digitally Controlled (BLDC) fan motor. The fan motor has inherent
protection, permanently lubricated bearings, and variable speed with
a maximum speed up to 950 rpm. Raised guards are provided to limit
contact with moving parts.
Indoor Unit
All of the indoor units have a single, direct-drive, turbo fan manu-
factured of high-strength ABS HT-700 polymeric resin; the fans are
statically and dynamically balanced. The fan motor is brushless
digitally controlled (BLDC) with permanently lubricated and sealed
ball bearings. The fan / motor assembly is mounted on vibra-
tion-attenuating rubber grommets. Fan speed is controlled using a
microprocessor-based direct digital control algorithm that provides
pre-programmed, field-selectable fixed or auto fan speeds in the
Heating and Cooling modes.
The indoor fan has Low, Med, High, Power Cool and Auto settings
for Cooling mode; and has Low, Med, High, and Auto settings for
Heating mode. Auto setting adjusts the fan speed based on the
difference between the controller set-point and space temperature.
Air Filter -
Indoor Unit
Return air is filtered with a
factory-supplied, removable,
washable filter accessible
from the bottom of the unit.
Electrical
The system was designed to
operate using 208–230/60/1
power with voltage varianc-
es of ±10% and includes
overcurrent protection.
The indoor unit is powered
through the outdoor unit.
Controls
Indoor and outdoor units are
factory wired with necessary
electrical control compo-
nents, printed circuit boards, thermistors, sensors, terminal blocks,
and lugs for power wiring. Factory installed microprocessor controls
in the outdoor unit and indoor unit shall perform functions to efficient-
ly operate the single zone system, communicating via an 18 AWG
four stranded and shielded conductor power/transmission cable. Mi-
croprocessor-based algorithms provide component protection, soft-
start capability, refrigeration system pressure, temperature, defrost,
and ambient control. System can be operated through a handheld
wireless controller supplied with the four-way ceiling cassette indoor
unit.
Condensate Lift/Pump
The indoor unit is provided with a factory installed and wired conden-
sate lift/pump capable of providing a minimum 27-1/2 inch (9k and
12k indoor units) or minimum 31-1/2 inch (18k to 42k indoor units) 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.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
78 | FOUR-WAY CASSETTE
Four-Way Ceiling Cassette System Engineering Manual
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