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Piping
Liebert
®
SRC
™
User Manual 48
5.2.13 Underground Refrigerant Piping
Refrigerant pipe installed underground should be routed inside a vapor-tight protective sleeve to prevent
deterioration of the insulation 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 th
e
frost line.
Figure 5-11 shows the arrangement of refrigerant pipe and cable(s) in a conduit. Table 5-10 shows
conduit sizes for utility conduit.
Figure 5-11 Typical arrangement of pipe and cables in a utility conduit
Table 5-10 Utility-conduit sizes
Liq uid Pipe
1
Vapor Pipe
1
3/8 (1-1/8
2,3
)5/8 (2-1/8
2,4
)
3/8 (1-1/8)
3
44
1. OD pipe diameter in inches. Values in parentheses indicate O D 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.
Table 5-11 Heat-pump unit refrigerant-pipe connections (All brazed type)
Model Liq uid Conn., in. Vapor Conn., in.
SCR18, 24, 36 3/85/8
Vapor Line
Liquid Line
Min. 18 Gauge
Cable
Power/Communication
Pi
p
e Sleeve
Insulation Material
Insulation
Material
MFL67502030 17. 7. 13. 오오 3:05 Page 58
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