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40 | reFrIGerAnT deSIGn
Single Zone Inverter W
all Mount Engineering Manual
Refrigerant Piping System Layout
pipe Sleeves at penetrations
LG requires that all pipe penetrations through walls, floors, and pipes buried underground be properly insulated and routed through an
appropriate wall sleeve of sufficient size to prevent compression of refrigerant pipe insulation and free movement of the pipe within the
sleeve. Underground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration.
Figure 19: Pipe Sleeve options
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pipe Sleeve
Insulation Material
Insulation
Material
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 20: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit
Table 12: 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.
inStallation & layout bESt praCtiCES
Diameter of penetrations shall be determined by pipe diameter plus the thickness of the insulation.
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)
LAU090HYV, LAU120HYV
1/4
3/8
Table 13: Heat Pump Unit Refrigerant Pipe Connections (All Brazed Type)
