SUCTION LINE SIZE - OUTDOOR UNIT ABOVE INDOOR COIL
R-410A System
Capacity Model
Line Size
Connection
Size (Inch
I.D.) [mm]
Line Size (Inch
O.D.) [mm]
Suction Line Size
Outdoor Unit
ABOVE
Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total
Equivalent
Length - Feet [m]
25 [7.62]
50 [15.24]
75 [22.86]
100 [30.48]
125 [45.72]
150 [45.72]
-25
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
NA
7/8" [22.23]
NA
-37
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
NA
7/8" [22.23]
NA
-39
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
NA
7/8" [22.23]
NA
-48
7/8" [22.23]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
NA
7/8" [22.23]
NA
-60
7/8" [22.23]
3/4" [19.05]
Same as Liquid Line Size Table
7/8" [22.23]*
NA
1-1/8" [28.58]
NA
SUCTION LINE SIZE - OUTDOOR UNIT BELOW INDOOR COIL
R-410A System
Capacity Model
Line Size
Connection
Size (Inch
I.D.) [mm]
Line Size (Inch
O.D.) [mm]
Suction Line Size
Outdoor Unit
BELOW
Indoor Coil (Cooling Only - Does not apply to Heat Pumps)
Total
Equivalent
Length - Feet [m]
25 [7.62]
50 [15.24]
75 [22.86]
100 [30.48]
125 [45.72]
150 [45.72]
-25
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
NA
3/4" [19.05]*
NA
7/8" [22.23]
NA
-37
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
Same as Liquid Line Size Table
NA
7/8" [22.23]
Same as Liquid Line Size Table
NA
-39
3/4" [19.05]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
Same as Liquid Line Size Table
NA
7/8" [22.23]
NA
-48
7/8" [22.23]
5/8" [15.88]
Same as Liquid Line Size Table
3/4" [19.05]*
Same as Liquid Line Size Table
NA
7/8" [22.23]
NA
-60
7/8" [22.23]
3/4" [19.05]
Same as Liquid Line Size Table
7/8" [22.23]*
Same as Liquid Line Size Table
NA
1-1/8" [28.58]
NA
14
TABLE 4
(-)ASL SUCTION LINE SIZING
NOTES: Using suction line larger than shown in chart will result in poor oil return.
*Standard Line Size
NOTES: Using suction line larger than shown in chart will result in poor oil return.
*Standard Line Size
