Specification Guide
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76 | DUCTED
Ceiling-Concealed Ducted System Engineering Manual
MECHANICAL SPECIFICATIONS
Ceiling-Concealed Ducted System
General
System
LG single zone ceiling-concealed ducted system comprises of a
single frame outdoor unit connected to a single indoor unit with a
single refrigerant circuit. An LG single zone ceiling-concealed ducted
system is a DFS 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 orga-
nization for Standardization (ISO). The system components comply
with Underwriters Laboratories (UL) 1995 Heating and Cooling
Equipment Standard for Safety and bear the Electrical Testing Labo-
ratories (ETL) label. Wiring in these units are in accordance with the
national Electrical Code (NEC). LG single zone ceiling-concealed
ducted 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 unit has sound levels not exceeding 54 dB(A) tested in
an anechoic chamber under ISO Standard 3745.
Indoor Unit
Ceiling-Concealed Ducted units are designed for air volume against
an external static pressure up to 0.20″WG for the 9,000 and 12,000
Btu/h models, up to 0.78″WG for the 24,000 Btu/h model; up to
0.6″WG for the 36,000 Btu/h model.
Temperature Ranges
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
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 re-
movable panel to allow
access to major internal
components, and legs
to secure the unit during
installation.
Indoor Unit
The indoor unit casing is designed to mount fully concealed above
a finished ceiling. Casing is manufactured of galvanized steel plate.
Cold surfaces of the unit are covered internally with a coated polysty-
rene insulating material, and covered externally with sheet insulation
made of ethylene propylene diene monomer (M-Class) (EPDM).
External insulation is plenum rated and conforms to ASTM Standard
D-1418. Hanger brackets are included on the casing to support the
weight on four corners. The indoor unit has a front horizontal supply
air discharge, and one dedicated rear horizontal return air. The sup-
ply air opening is flanged to accept field-installed ductwork that shall
not exceed the external static pressure limitation of the unit.
Refrigerant System
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, includ-
ing 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.
Compressors
The outdoor unit is equipped with one hermetically sealed, digitally
controlled, inverter-driven twin rotary compressor to modulate capac-
ity (variable from 20 to 100 Hz, modulate in 1 Hz increments). Teflon
coated bearings, overcurrent protection and vibration isolation are
integrated with the compressor.
Figure 70: Ceiling-Concealed Ducted
System (LH247HV High Static Model).