Best Practices for LG HVAC System Installation
13
Best Practices for LG HVAC System Installation
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.
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 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 9: 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. 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 10: Typical Arrangement of Refrigerant Pipe
and Cable(s) in a Utility Conduit.
Table 6: 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
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
Provide expansion joints in long pipe segments and place in an acces-
sible conduit box for inspection. Use galvanized curved sheet metal
saddles at all mounting points. Pipe should be allowed to move freely
linearly.
REFRIGERANT SYSTEM ENGINEERING