Piping
49 Liebert
®
SRC™ User Manual
5.3 Piping Connections
5.3.1 Connection Limitations
Liebert SRC systems consist of one outdoor unit and one indoor unit. One of the most critical elements of
a system is the refrigerant piping. Table 5-12 lists pipe-length limits that must be followed in the design of
an SRC system. Refer to Figure 5-12 for maximum length and elevation of piping.
Figure 5-12 System layout
Table 5-12 Refrigerant-piping system limitations
Pipe Length
(ELF = Equivalent length of pipe in feet)
Longest total equivalent piping length
SRC18 SRC24 SRC36
98.4 164.0 164.0
Shortest total equivalent piping length 9.8 9.8 9.8
Distance between fittings and indoor units or outdoor units >
20 in. >20 in. >20 in.
Elevation
(All elevation limitations are measured
in actual feet.)
If outdoor unit is above indoor unit. 49.2 98.4 98.4
If outdoor unit is below indoor unit. 49.2 98.4 98.4
Additional refrigerant needed (oz/ft) 0.22 0.38 0.38
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
Max Length = A
Max Elevation = B
Unit = Feet
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