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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
Inside wall (concealed)
A
B
Floor (fire-resistance)
D
F
G
B
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.
Table 11: 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
REFRIGERANT PIPING CONNECTIONS
Outside wall
D
C
B
A
Roof pipe shaft
G
D
B
H
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.
Refrigerant Piping System Layout
Outside wall (exposed)
E
B
I
Area between fire-resistant
insulation and boundary wall
I
J
A
40 in
40 in
Figure 23: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit
)
2,4
Table 12: Heat Pump Unit Refrigerant Pipe Connections
(All Brazed Type)
Model
LAU090HVP LAU120HVP
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.)
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Liquid Conn.
(inches)
1/4
Vapor Conn.
(inches)
3/8
29
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