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Planning for Snow and Ice, continued.
When deciding on a location to place the outdoor unit, be sure to choose an area where run-off from defrost will not accumulate and freeze on side-
walks or driveways, which may create unsafe conditions. Properly install and insulate any drain hoses to prevent the hose from freezing, cracking,
leaking, and causing unsafe conditions from frozen condensate.
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 29: 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 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.
Lightning Protection
• To protect the outdoor unit from lightning, it must be placed within
the specified lightning safety zone.
Table 31: 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.
If the building does not include lightning protection, the outdoor unit may be damaged from a lightening strike. Inform the customer of this possibility
in advance.
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 37: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
)
2,4
Table 30: Outdoor Unit Refrigerant Pipe Connections (All Brazed Type).
Model
LSU090HSV5, LSU120HSV5
LSU181HSV5
Figure 38: Lightning Protection Diagram.
Lightning rod
197
25
Outdoor Unit
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Liquid Conn.
Vapor Conn.
(inches)
(inches)
1/4
3/8
Lightning rod
Protection Angle (25˚~55˚)
5 feet
Safe zone
Ground
APPLICATION | 53
3/8
5/8
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