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Due to our policy of continuous product innovation, some specications may change without notication.
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8 | DUCTED
Ceiling-Concealed Ducted System Engineering Manual
PRODUCT FEATURES AND BENEFITS
Ceiling-Concealed Ducted Systems
Single zone ceiling-concealed ducted systems are equipped with in-
verter components that offer superior load matching and long piping
installation. The product works for optimizing power consumption in
residential and small office buildings. Using a ducted indoor unit with
custom temperature controls allow for precise temperature settings
in each zone of the building. Ceiling-concealed ducted indoor units
allow flexibility in interior design.
Lower Sound Levels
When outdoor units operate fully loaded, they have one of the quiet-
est sound levels in the industry, operating as low as 47 dB(A). To
promote a quiet, comfortable environment, ceiling-concealed ducted
indoor units operate as low as 23 dB(A). LG customers often ask if
the outdoor unit is running after commissioning is complete.
All rotating components are soft-started by the controller using digi-
tally 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 provid-
ing 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
outdoor unit responds by varying the compressor speed and fan mo-
tors as needed to maintain system operating pressure. As a result,
ceiling-concealed ducted 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 ceiling-concealed ducted 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 ceiling-concealed ducted system simplies 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
Ceiling-concealed ducted systems are available in 9,000 and 12,000
Btu/h capacities (low static), and in 24,000 and 36,000 Btu/h capaci-
ties (high static).
9,000 and 12,000 Btu/h Low Static Operating 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
cooling; 61°F to 86°F (WB) for heating.
24,000 and 36,000 High Static 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
Heat Transfer Efficiency
Fin Design with GoldFin™ Coating
All ceiling-concealed ducted 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 ceiling-
concealed ducted outdoor coil fin surface is coated with LG’s exclu-
sive GoldFin™ anti-corrosive coating designed to prevent natural
surface corrosion of the aluminum 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 dur-
ing 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)
• Auto restart
• Auto operation
• Auto changeover
• Sleep mode
• Internal condensate pump included
• Precision Load Matching
• Follows AHRI 210/240
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