LG LH247HV, Engineering Manual

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Refrigerant Piping Design and Best Practices
reFrigerant PiPing deSign
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.)
Pipe Sleeves at Penetrations
LG requires that all pipe penetrations through walls, floors, and
pipes buried underground be routed through a properly insulated
sleeve that is sufficiently sized to provide free movement of the pipe
and does not compress the insulation. Underground refrigerant pipe
shall be routed inside a protective sleeve to prevent insulation dete-
rioration. Also follow federal, state, and local regulations and codes
when choosing a sleeve type.
Figure 39: Pipe Sleeve Options.
For example:
Diameter of Gas Piping: 1/2"
Diameter of Liquid Piping: 1/4"
Thickness of Gas Piping Insulation: 0.4" x 2
Thickness of Liquid Piping Insulation: 0.4" x 2
Surplus: 0.8"
Sleeve diameter (total): 3.1" minimum
Diameter of penetrations shall be determined by pipe diameter
plus the thickness of the insulation.
Vapor Line
Liquid Line
Min. 18 Gauge
Communications
Cable
Pipe Sleeve
Insulation Material
Insulation
Material
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 40: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
Table 36: 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 37: Heat Pump Unit Refrigerant Pipe Connections (Flared).
System Model No.
Liquid Conn. (inches,
O.D.)
Vapor Conn. (inches,
O.D.)
LH247HV, LH367HV 3/8 5/8
refrigerant Piping System Layout