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Refrigerant Piping System Layout
40 in40 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.
( Do not use a vinyl cover.)
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.
Underground refrigerant pipe shall be routed inside a protective sleeve to prevent insulation deterioration.
Figure 53: 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 54: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
Table 41: 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.
5
Insulation thickness (value in parenthesis) = 3/4 inch.
Liquid Pipe
1
Vapor Pipe
1
1/2 (2.0
2,5
) 5/8 (2-1/8
2,5
) 3/4 (2-1/4
2,5
)
1/4 (1.0)
3
4 4 4
3/8 (1-1/8)
3
4 4 5
1/2 (1-1/2)
4
5 5 5
5/8 (1-5/8)
4
5 5 5
3/4 (1-3/4)
4
5 5 5
Table 42: Outdoor Unit Refrigerant Pipe Connections.
System Model No. Liquid Conn. (inches) Vapor Conn. (inches)
LC097HV, LC127HV 1/4 3/8
LC187HV, LC247HV,
LC367HV, LC427HV
3/8 5/8
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
INSTALLATION & LAYOUT BEST PRACTICES
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.
68 | FOUR-WAY CASSETTE
Four-Way Ceiling Cassette System Engineering Manual
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