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PLACEMENT CONSIDERATIONS
Outdoor Unit
Underground Refrigerant Piping
Refrigerant pipe installed underground must 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 refriger-
ant pipe must be located at a level
Table 54: Utility Conduit Sizes (Inches).
Liquid Pipe
1
3/8 (1-1/8
1/4 (1.0)
4
4
3/8 (1-1/8)
4
4
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 must be calculated and specified by the design
engineer.
Insulation thickness (value in parenthesis) = 3/8 inch.
3
Insulation thickness (value in parenthesis) = 3/4 inch.
4
Table 55: LDN187HV4 Ceiling-Concealed Ducted (Low Static) Indoor Unit
Refrigerant Pipe Connection Port Diameters.
Model No.
LDN187HV4
Table 56: LDN187HV4 Ceiling-Concealed Ducted (Low Static) Indoor
Unit Refrigerant Pipe Sizes.
Model No.
LDN187HV4
Table 58: LHN248HV, LHN368HV, LHN428HV, LHN488HV (High Static) Indoor Unit Refrigerant Pipe Connections.
Model
LHN248HV, LHN368HV,
LHN428HV, LHN488HV
Table 59: LHN248HV, LHN368HV, LHN428HV, LHN488HV (High Static) Indoor Unit Refrigerant Pipe Sizes.
Model
LHN248HV, LHN368HV,
LHN428HV, LHN488HV
78 | DUCTED
.
Vapor Pipe
1
2,3
)
1/2 (2.0
2,4
)
5/8 (2-1/8
4
4
4
4
Vapor (inch)
Liquid (inch)
Ø1/2
Ø1/4
Vapor (inch)
Liquid (inch)
5/8
3/8
Liquid (inches)
3/8
Liquid (inches)
3/8
©
Figure 46: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
2,4
)
Table 57: LDN187HV4 Ceiling-Concealed Duct (Low Static)
Indoor Unit Refrigerant Pipe Connections.
1/2 in. to 5/8 in.
Connection
Ø1/2 in.
Flare side
to outdoor unit
1/4 in. to 3/8
Connection
Ø1/4 in.
Flare side
to outdoor unit
Vapor (inches)
5/8
Vapor (inches)
5/8
Vapor Line
Insulation Material
Liquid Line
Pipe Sleeve
Insulation
Material
Min. 18 Gauge
Power/Communication
Cable
Flare side to indoor
Piping
unit
Flare nut
Ø5/8 in.
Connection socket
Flare side to indoor
Piping
unit
Flare nut
Ø3/8 in.
Connection socket
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