13
4.0 INSTALLATION
Table 2A: Refrigerant Line Sizing Chart (English Units)
Unit Size
Allowable
Liquid Line
Size
Allowable
Suction
Line
Size
Outdoor Unit ABOVE or BELOW Indoor Unit
Equivalent Length (Feet)
<25
26-50
51-75
76-100
101-125
126-150
Maximum Vertical Rise (Outdoor Unit Below Indoor Unit)* / Capacity Multiplier
2.0 Ton
*SEE
NOTE 3
1/4”
5/8”
25 / 1.00 50 / 0.99 32 / 0.98
4 / 0.97
NR
NR
5/16”
5/8”
25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
3/8”
5/8”
25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.95
1/4”
3/4”**
25 / 1.00 50 / 1.00 32 / 0.99
4 / 0.99
NR
NR
5/16”
3/4”**
25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3/8”
3/4”**
25 / 1.00 50 / 1.00 50 / 0.99 50 / 0.99 50 / 0.99 50 / 0.98
3 Ton
5/16”
5/8”
25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 37 / 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 50 / 0.98 37 / 0.97 22 / 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
4 Ton
3/8”
3/4”
25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.94 50 / 0.93
1/2”
3/4”
25 / 0.99 50 / 0.98 50 / 0.97 50 / 0.96 50 / 0.94 50 / 0.93
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
5Ton
3/8”
3/4”
25 / 0.99 50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91
NR
1/2”
3/4”
25 /0.99
50 / 0.97 50 / 0.95 50 / 0.93 50 / 0.91
NR
3/8”
7/8”
25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97 38 / 0.96
1/2”
7/8”
25 / 1.00 50 / 0.99 50 / 0.98 50 / 0.98 50 / 0.97 50 / 0.96
Notes:
1)
DO NOT
exceed 150 ft lineal line length.
2) *
DO NOT
exceed 50 ft vertical separation between indoor and outdoor units.
3) **3/4” suction line should only be used for 2 ton system 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) Applications shaded in light gray indicate capacity multipliers between 0.90 and 0.96, which are not
recommended, but are allowed.
6) Applications shared in dark gray are not recommended but to excessive, liquid or suction pressure drop.
20 SEER Variable Speed Air-Conditioners
