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General Installation Guidelines
Due to our policy of continuous product innovation, some specifications may change without notification.
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GENERAL INSTALLATION GUIDELINES
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 39: Typical Arrangement of Refrigerant Pipe and Cable(s) in a
Utility Conduit.
Table 23: 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.
Liquid Pipe
1
Vapor Pipe
1
3/8 (1-1/8
2,3
) 1/2 (2.0
2,4
) 5/8 (2-1/8
2,4
)
1/4 (1.0)
3
444
3/8 (1-1/8)
3
444
Table 24: Heat Pump Unit Refrigerant Pipe Connections (All Brazed
Type)
Model
Liquid Conn.
(inches)
Vapor Conn.
(inches)
LSU091HSV3, LSU121HSV3 1/4 3/8
LSU181HSV3, LSU240HSV3 3/8 5/8
LSU307HV3, LSU360HV3 3/8 5/8
LSU240HLV, LSU300HLV, LSU360HLV 3/8 5/8
LSU090HEV, LSU120HEV,
LSU090HEV1, LSU120HEV1,
LSU090HXV, LSU120HXV
1/4 3/8
LSU180HEV, LSU180HEV1 1/4 1/2
LSU240HEV, LSU240HEV1 1/4 5/8
Refrigerant Piping System Layout
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pi
e Sleeve
Insulation Material
Insulation
Material
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