< 25 26-50 51-75 76-100 101-125 126-150
1/4" 5/8" 25 / 0.99 50 / 0.98 29 / 0.97 0 / 0.97 NR NR
5/16" 5/8" 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.97 50 / 0.96 50 / 0.95
3/8" 5/8" 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.97 50 / 0.96 50 / 0.95
1/4" 3/4" * 25 / 1.00 50 / 1.00 29 / 0.99 0 / 0.99 NR NR
5/16" 3/4" * 25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98
3/8" 3/4" * 25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98
5/16" 5/8" 25 /
0.99 50 / 0.97 50 / 0.95 49 / 0.93 31 / 0.91 NR
3/8" 5/8" 25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91 NR
5/16" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 49 / 0.98 31 / 0.97 14 / 0.96
3/8" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
1/2" 3/4" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96
3/8" 3/4" 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.95 50 / 0.94 50 / 0.92
1/2" 3/4" 25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.95 50 / 0.94 5
0 / 0.92
3/8" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
1/2" 7/8" 25 / 1.00 50 / 0.99 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97
3/8" 3/4" 25 / 0.99 50 / 0.96 50 / 0.94 50 / 0.92 NR NR
1/2" 3/4" 25 / 0.99 50 / 0.96 50 / 0.94 50 / 0.92 NR NR
3/8" 7/8" 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 45 / 0.96 30 / 0.95
1/2" 7/8" 25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
Notes:
1) Do not exceed 150 linear line length.
2) Do not exceed 50 vercal separaon between indoor and outdoor units.
3) * 3/4" vapor line should only be used for 2 ton systems if outdoor unit is below or at same level as indoor
unit to assure proper oil return.
4) Always use the smallest liquid line allowable to minimize refrigerant charge.
5) Applicaons shaded in light gray indicate capacity mulpliers between 0.90 and 0.96 which
are not
recommended, but are allowed.
6) Applicaons shaded in dark gray are not recommended due to excessive liquid or sucon pressure drop.
Table 2A: Refrigerant Line Sizing Chart (English Units)
Equivalent Length (Feet)
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