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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.
8 | FOUR-WAY CASSETTE
Four-Way Ceiling Cassette System Engineering Manual
PRODUCT FEATURES AND BENEFITS
Four-Way Ceiling Cassette Systems
Single zone four-way ceiling cassette systems are equipped with
inverter components that offer superior load matching and long
piping installation. The product works for optimizing power consump-
tion in residential and small office buildings. Using a four-way ceiling
cassette indoor unit with custom temperature controls allow for
precise temperature settings in each zone of the building. Four-way
ceiling cassette indoor units allow flexibility in interior design and
complement any decor.
Lower Sound Levels
When outdoor units operate fully loaded, they have one of the qui-
etest sound levels in the industry, operating as low as 47 dB(A). To
promote a quiet, comfortable environment, four-way ceiling cassette
indoor units operate as low as 30 dB(A) at low speed. LG custom-
ers often ask if the outdoor unit is running after commissioning is
complete. All rotating components are soft-started using digitally
controlled inverters, which reduce undesirable noise caused by fans
and compressors cycling on and off.
Comfort Control at its Best
Tight temperature control through precise load matching. Unlike
traditional air conditioning control systems, which use thermostatic
controls to maintain room temperatures, LG inverters continuously
vary the indoor unit fan speed and refrigerant flow, indirectly pro-
viding lower and more consistent humidity levels in the conditioned
space.
The longer the indoor coil temperature is below the dewpoint of the
room in conjunction with air movement across the coil, the space
humidity level will vary little, compared to technologies that cycle
fans and compressors on and off multiple times per hour. The out-
door unit responds by varying the compressor speed and fan motors
as needed to maintain system operating pressure. As a result,
four-way ceiling cassette systems deliver precise space temperature
control.
Inverter Driven
The compressor is optimized to maximize compressor efficiency,
which reduces power consumption and monthly utility bills. This
inverter technology allows the LG four-way ceiling cassette out-
door unit to vary the compressor motor shaft speed and deliver an
appropriate amount of cooling to the indoor unit. Occupants remain
comfortable while utility costs are reduced.
Simplified Installation
The LG four-way ceiling cassette system simplifies and reduces
mechanical and control system design time. The designer no longer
has to be concerned with interconnecting chilled and condenser
water piping, complicated air distribution duct systems, matching
and selecting chillers, towers, pumps, coils, fans, air handlers, or
Variable Air Volume (VAV) boxes.
Operating Range
Four-way ceiling cassette systems are available in 9,000, 12,000,
18,000, 24,000, 36,000, and 42,000 Btu/h capacities.
9,000 and 12,000 Btu/h Operat-
ing Ranges
• Operating ranges for outdoor units
of 0°F to +118°F (DB) for cooling
(Cooling range can be extended
from 0°F down to -4°F using the
Low Ambient Wind Baffle Kit [sold
separately]); -4°F to +64°F (WB) for
heating.
• Operating ranges for indoor units of
57°F to 77°F (WB) for cooling; 59°F
to 81°F (DB) for heating.
• Indoor unit temperature setting
range of 65°F to 86°F (DB) for cool-
ing; 61°F to 86°F (WB) for heating.
18,000, 24,000, 36,000, and
42,000 Operating Ranges
• Operating ranges for outdoor units of 5°F to +118°F (DB) for
cooling; 0°F to +64°F (WB) for heating.
• Operating ranges for indoor units of 57°F to 77°F (WB) for cooling;
59°F to 81°F (DB) for heating.
• Indoor unit temperature setting range of 65°F to 86°F (DB) for
cooling; 61°F to 86°F (WB) for heating
Clean Finish
The four-way ceiling cassette indoor unit case is recessed, while
the off-white architectural grille (required, sold separately) is flush
mounted, providing a clean look to the room.
Heat Transfer Efficiency
Fin Design with GoldFin™ Coating
All four-way ceiling cassette outdoor units are provided with large
surface coils made of copper tubes with louvered aluminum fins
designed to maximize unit operating efficiency over a wide range of
ambient conditions. Standard from the factory, the LG outdoor coil
fin surface is coated with LG’s exclusive GoldFin™ anti-corrosive
coating designed to prevent natural surface corrosion of the alumi-
num fins. This maintains heat transfer properties of the coil for an
extended time. A hydrophilic coating is applied to the outdoor unit
coil fin surface over the GoldFin coating. This coating enhances the
development of heavier water droplets gathering on the fin surface.
As a result, the droplets roll off the fin surfaces, delaying the point
when frost forms on the coil surface during heating operation. This
coating also makes it possible to easily clean the outdoor unit coil
using a mild soap.
Other Features
• Inverter (Variable Speed)
Compressor
• Five fan speeds
• Auto restart
• Auto changeover
• Swirl Wind
• Internal condensate pump
included
• Precision Load Matching
• Follows AHRI 210/240
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