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underground refrigerant Piping
Refrigerant pipe installed underground should 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
refrigerant pipe must be located at a level below the frost line.
Table 12: Utility Conduit Sizes.
Liquid Pipe
1
3/8 (1-1/8
1/4 (1.0)
4
3
3/8 (1-1/8)
4
3
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 should be calculated and specified by the design
engineer.
Insulation thickness (value in parenthesis) = 3/8 inch.
3
Insulation thickness (value in parenthesis) = 1 inch.
4
General InstallatIon GuIdelInes
Vapor Pipe
1
)
1/2 (2.0
)
5/8 (2-1/8
2,3
2,4
4
4
4
4
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 28: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
)
2,4
Table 13: Heat Pump Unit Refrigerant Pipe Connections
(All Brazed Type)
Model
LSU090HSV4, LSU120HSV4
LSU180HSV4
Underground Piping
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
3/8
5/8
25
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