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Refrigerant Piping Connections
Due to our policy of continuous product innovation, some specifications may change without notification.
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REFRIGERANT PIPING CONNECTIONS
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
(Table 16). Underground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration. Refer to Figure 22.
Figure 22: Pipe Sleeve Options
Diameter of penetrations shall be determined by pipe diameter plus the thickness of the insulation.
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
.
Figure 23: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit
Table 11: Utility Conduit Sizes.
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) = 1 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)
3
4
4
4
3/8 (1-1/8)
3
4
4
4
Table 12: Heat Pump Unit Refrigerant Pipe Connections
(All Brazed Type)
Model
Liquid Conn.
(inches)
Vapor Conn.
(inches)
LAU090HVP LAU120HVP
1/4
3/8
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pipe Sleeve
Insulation Material
Insulation
Material
Refrigerant Piping System Layout
40 in
40 in
A
B
D
F
G
B
G
D
B
H
I
J
A
E
B
I
A
B
D
C
Inside wall (concealed)
Floor (fire-resistance)
Area between fire-resistant
insulation and boundary wall
Roof pipe shaft
Outside wall
Outside wall (exposed)
Sleeve
Insulation
Lagging
Caulk
Band
Water-resistant layer
Sleeve with edge
Lagging
Mortar or other fire-resistant caulk
Fire-resistant insulation
When filling an access hole with mortar, cover the
area with steel plate so that the insulation will not
fall through. For this area, use fire-resistant
materials for both the insulation and cover. (Vinyl
cover should not be used.)