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Due to our policy of continuous product innovation, some specications may change without notication.
©
LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG ” is a registered trademark of LG Corp.
REFRIGERANT DESIGN | 61
Refrigerant Piping Design & Layout Best Practices
Refrigerant Piping System Layout
Figure 36: Pipe Sleeve Options.
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 refriger-
ant pipe must be located at a level below the frost line.
Figure 37: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
INSTALLATION & LAYOUT BEST PRACTICES
Diameter of penetrations shall be determined by pipe diameter plus the thickness of the insulation.
Pipe Sleeves at Penetrations
LG requires that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an ap-
propriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and free movement of the pipe within the sleeve
(Figure 36). Underground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration.
Table 16: Utility Conduit Sizes (Inches)
1
OD pipe diameter in inches; Values in parenthesis () indicate OD of pipe with insulation jacket.
2
Diameter of pipe with insulation. Thickness of pipe insulation is typical. Actual required thickness may
vary based on surrounding ambient conditions and should be calculated and specified by the design
engineer.
3
Insulation thickness (value in parenthesis) = 3/8 inch.
4
Insulation thickness (value in parenthesis) = 3/4 inch.
Liquid Pipe
1
Vapor Pipe
1
3/8 (1-1/8
2,3
) 1/2 (2.0
2,4
) 5/8 (2-1/8
2,4
)
1/4 (1.0)
4
4 4 4
3/8 (1-1/8)
4
4 4 4
Model
Liquid Conn.
(inches)
Vapor Conn.
(inches)
LSU090HEV1, LSU120HEV1 1/4 3/8
LSU180HEV1 1/4 1/2
LSU240HEV1 1/4 5/8
LSU090HXV, LSU120HXV 1/4 3/8
Table 17: Outdoor Unit Refrigerant Pipe Connections (All Brazed Type).
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
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