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43
General Refrigerant Piping System Information
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.
MULTI
F
MAX
MULTI
F
WITH
Pipe Sleeves at Penetrations
LG recommends 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 promote free movement of the pipe within
the sleeve. Use 4"+ curved sheet metal saddles between the bottom surface of the pipe and the bottom surface of the penetration.
Figure 38: Pipe Sleeve Options.
Diameter of penetrations must be determined by pipe diameter plus the thickness of the insulation.
Underground Refrigerant Piping
Refrigerant pipe installed underground must be routed inside a vapor tight
protective sleeve to prevent insulation deterioration and water infiltration. Re-
frigerant 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 39: Typical Arrangement of Refrigerant Pipe
and Cable(s) in a Utility Conduit.
Table 20: 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 will vary based on surrounding ambient conditions and must be calculated and
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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
3/8 (2.0
2,5
) 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
44 4 4
3/8 (1-1/8)
3
44 4 5
1/2 (1-1/2)
4
55 5 5
5/8 (1-5/8)
4
55 5 5
3/4 (1-3/4)
4
55 5 5
Vapor Line
Liquid Line
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
Provide expansion joints in long pipe segments and place in an accessi-
ble conduit box for inspection. Use galvanized curved sheet metal sad-
dles at all mounting points. Pipe must be allowed to move freely linearly.
REFRIGERANT SYSTEM ENGINEERING
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