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Maximum Total
Tonnage
Equivalent
Length (ft)
24
36
180
48
60
Table 5. NS23AM Line Set Guidelines – 51 to 150 Linear Feet in Length
Tonnage
Line SIze
5/16"
24
3/8"
3/8"
36
1/2"
3/8"
48
1/2"
3/8"
60
1/2"
NOTE: Shaded rows indicate rated liquid line size.
A. Find your tonnage on the left side of the table.
B. Start with the rated liquid line size (shaded row) on the outdoor tonnage.
C. Select the actual Total Linear Length of your system shown at the top of the table.
D. The elevation listed in the table is the maximum allowed for the liquid line listed.
E. Select or consider the larger liquid line size shown in the table if the elevation does not meet your requirements.
NOTE: For new or replacement line set installation, refer to Refrigerant Piping Guidelines Publication Number 31-5000722.
Maximum Linear
Maximum Vapor
(actual) Length
Riser (ft)
(ft)
150
60
25
50
25
50
25
50
25
50
25
50
25
50
25
50
25
50
25
50
Table 6. Liquid Line Diameter Selection
Page 14
Maximum Linear
Liquid Lift (ft)
60
Total Linear Length (ft.)
75
100
55
48
60
60
60
56
60
60
50
41
60
60
36
22
60
60
Preferred Vapor
Required Vapor
Line Sizes for
Riser Size
Horizontal Runs
5/8"
3/4"
7/8"
7/8"
125
150
40
33
60
60
51
45
60
60
31
22
60
60
8
NR
60
59
31-5000746 Rev. 0
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