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Underground Refrigerant Piping
Refrigerant pipe installed underground must be routed inside a vapor
tight protective sleeve to prevent insulation deterioration and water
infiltration. Refrigerant pipe installed inside underground
casing must be continuous without any joints. Underground refriger-
ant pipe must be located at a level below the frost line.
Table 53: Utility Conduit Sizes (Inches).
Liquid Pipe
1
3/8 (1-1/8
1/4 (1.0)
4
4
3/8 (1-1/8)
4
4
OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation jacket.
1
Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required thickness may
2
vary based on surrounding ambient conditions and must be calculated and specified by the design
engineer.
Insulation thickness (value in parenthesis) = 3/8 inch.
3
Insulation thickness (value in parenthesis) = 3/4 inch.
4
Tie-Downs, Wind Restraints, and
Lightning Protection
Tie-Downs
• The strength of the roof must be checked before installing the
outdoor units.
• If the installation site is prone to high winds or earthquakes, when
installing on the wall or roof, securely anchor the mounting base
using a field-provided tie-down configuration approved by a local
professional engineer.
• The overall tie-down configuration must be approved by a local
professional engineer. Always refer to local code when using a
wind restraint system.
Always refer to local code when designing a wind restraint system.
Lightning Protection
• To protect the outdoor unit from lightning, place the unit within the
specified lightning safety zone.
Table 52: Safety Zone Specifications.
Building Height (feet)
Protection Angle (˚)
• Power cable and communication cable must be installed five (5)
feet away from lightning rod.
• A high-resistance ground system must be included to protect
against induced lightning or indirect strike.
PLACEMENT CONSIDERATIONS
Vapor Pipe
1
)
1/2 (2.0
)
5/8 (2-1/8
2,3
2,4
4
4
4
4
66
98
148
55
45
35
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
Figure 53: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
)
2,4
Table 54: Outdoor Unit Refrigerant Pipe Connections (All Brazed Type).
Model
LD097HV4, LD127HV4
LD187HV4
LH248HV4, LH368HV4
Figure 52: Lightning Protection Diagram.
Lightning rod
197
25
If the building does not include lightning protection, the outdoor unit
may be damaged from a lightning strike. Inform the customer of this
possibility in advance.
Outdoor Unit
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Liquid Conn.
Vapor Conn.
(inches)
1/4
1/4
3/8
Lightning rod
Protection Angle (25˚~55˚)
5 feet
1.5m
1.5m
Safe zone
Ground
DUCTED | 74
(inches)
3/8
1/2
5/8
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