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Single-Zone LGRED° Four-Way Ceiling-Cassette System Engineering Manual
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MECHANICAL SPECIFICATIONS
General
System
LG single zone four-way ceiling cassette system comprises of a
single frame outdoor unit connected to a single indoor unit with a
single refrigerant circuit. An LG single zone four-way ceiling cassette
is a system that can operate in either cooling or heating mode.
The system is capable of changing mode within a maximum time
of three (3) minutes to ensure indoor temperature can be properly
maintained. LG components are manufactured in a facility registered
to ISO 9001 and ISO 14001, which is a set of standards applying
to environmental protection set by the International organization
for Standardization (ISO). The system components comply with
CSA Standard for Safety and bear the CSA label. Wiring in these
units are in accordance with the national Electrical Code (NEC).
LG single zone four-way ceiling cassette systems have published
performance ratings certified by AHRI (Air-Conditioning, Heating,
and Refrigeration Institute) and are listed in the AHRI Standard 210 /
240 certified product directory.
Outdoor Unit
The outdoor units have sound levels not exceeding 56 dB(A) tested
in an anechoic chamber under ISO Standard 3745.
Indoor Unit
The indoor units have sound ratings no higher than 56 dB(A) as
tested per ISO Standard 3745.
Temperature Ranges
18,000, 24,000, 36,000, 42,000, and 48,000 Btu/h Ceiling
Cassette Operating Ranges
• Operating range for outdoor units of 5°F to +118°F (DB) for cooling
(Cooling range can be extended from 5°F down to -4°F using the
Low Ambient Wind Baffle Kit [sold separately]).
• Operating range for outdoor units of -13°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 (DB) for heating.
Casing / Frame
Outdoor Unit
The outdoor condensing unit case is constructed from pre-coated
metal (PCM) that has been tested in accordance with ASTM B-117
salt spray procedure for a minimum of 1,000 hours. Case has a
removable panel to allow access to major internal components, and
legs to secure the unit during installation.
Indoor Unit
The indoor unit case is constructed of a galvanized steel plate
designed to recess in the ceiling, and has a surface mounted
concentric grille on the bottom of the unit. Unit has four supply
air outlets and one return air inlet. The supply air outlet has four-
directional slot diffusers, each equipped with an independent
oscillating motorized guide
vane to change airflow
direction. A guide vane
algorithm sequentially
changes the predominant
discharge airflow direction
in counterclockwise pattern,
or can be used to lock each
guide vane independently
in a field-adjusted fixed
position. The four vanes can
be individually adjusted from
the wired remote controller to
customize the airflow pattern
for the conditioned space.
A setting in the cooling and
heating modes can cycle
the vanes up and down
for uniform / random air
distribution.
The smart dual vane (for 24,000 Btu/h ~ 48,000 Btu/h indoor units
only) moves the air dynamically and evenly distributes air to every
corner of large space. The dual vane provides optimized angle and
provides conditioned air without feeling the draft.
A required architectural grille is sold as a separate required
accessory. The four-way grille is off-white acrylonitrile butadiene
styrene (ABS) polymeric resin with a tapered trim edge.
The unit has capability of sensing both temperature and humidity to
avoid over cooling and maximizing comfort using Humidity sensor
(sold separately).
Refrigerant System
The system is designed for use with R410A refrigerant, and consists
of a single refrigeration circuit. The refrigeration circuit is pressure-
tested at the factory and shipped with a holding charge of helium
gas. The outdoor unit is provided with factory installed components,
including a refrigerant strainer, accumulator, four-way reversing
valve, electronic expansion valve (EEV), high and low side charging
ports, service valves, and interconnecting piping. All refrigerant
lines from the outdoor unit to the indoor unit are field-installed and
must be insulated separately. LUU420HHV and LUU480HHV include
a sub-cooled heat exchanger, vapor injection, and vapor bypass
circuit.
Compressors
All of the outdoor units are equipped with one hermetically sealed,
digitally controlled, inverter-driven R1 scroll compressor to modulate
capacity (modulation in 1 Hz increments). Teflon coated bearings,
overcurrent protection and vibration isolation are integrated with the
compressor.
Figure 3: Four-Way 18,000 Btu/h 2x2
Ceiling Cassette System (LC188HHV4).
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