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AG 31-011 • REFRIGERANT PIPING DESIGN 44 www.DaikinApplied.com
Table 9: R-410A Refrigerant Line Size (Tons)
Suction Discharge Liquid
SST 0°F 20°F 40°F 0°F 20°F 40°F
∆T 2°F 1°F 0 .5°F 2°F 1°F 0 .5°F 2°F 1°F 0 .5°F 1°F 1°F 1°F vel =
100
fpm
1°F 5°F
∆p (PSI) 2 .57 1 .29 0 .64 3 .46 1 .73 0 .87 4 .50 2 .25 1 .13 4 .75 4 .75 4 .75 4 .75 23 .30
OD (in .)
1/2 0.4 0.3 0.2 0.6 0.4 0.3 0.9 0.6 0.4 1.3 1.3 1.3 2.0 4.6 10.8
5/8 0.8 0.5 0.4 1.2 0.8 0.6 1.7 1.2 0.8 2.4 2.4 2.5 3.2 8.6 20.2
7/8 2.1 1.4 1.0 3.1 2.1 1.5 4.4 3.0 2.1 6.2 6.4 6.5 6.7 22.6 52.9
1-1/8 4.2 2.9 2.0 6.2 4.3 3.0 8.9 6.1 4.2 12.5 12.9 13.2 11.4 45.8 106.6
1-3/8 7.3 5.1 3.5 10.9 7.5 5.2 15.4 10.7 7.3 21.7 22.4 22.9 17.4 79.7 185.0
1-5/8 11.6 8.0 5.5 17.1 11.8 8.2 24.3 16.7 11.6 34.3 35.3 36.1 24.6 125.9 291.5
2-1/8 24.1 16.6 11.4 35.5 24.5 16.9 50.2 34.8 24.1 70.8 72.8 74.6 42.8 260.7 601.1
2-5/8 42.5 29.4 20.2 62.5 43.3 30.0 88.4 61.4 42.5 124.5 128.3 131.2 66.0 459.7 1056.4
3-1/8 67.8 46.8 32.4 99.5 69.1 47.8 140.8 97.9 67.9 198.4 204.3 209.0 94.2 733.0 1680.5
3-5/8 100.5 69.7 48.1 147.7 102.7 71.0 208.7 145.3 100.8 293.9 302.7 309.6 127.4 1087.5 2491.0
4-1/8 141.6 98.3 67.9 208.2 144.7 100.2 293.7 204.8 142.1 413.8 426.1 435.9 165.7 1530.2 3500.9
5-1/8 253.1 175.4 121.5 370.8 258.0 179.2 523.2 365.0 253.8 737.3 759.3 776.7 258.2 2729.8 6228.4
6-1/8 405.8 282.3 195.7 594.9 414.5 287.8 839.8 586.1 407.6 1180.9 1216.2 1244.1 371.1 4383.7 9980.4
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 9 are based on 105°F condensing temperature. Multiply table capacities by the following factors for other
condensing temperatures.
Condensing
Temperature (°F)
Suction Line Discharge Line
80 1.170 0.815
90 1.104 0.889
100 1.035 0.963
110 0.964 1.032
120 0.889 1.096
130 0.808 1.160
Notes for Table 9 :
1. Table capacities are in tons of refrigeration.
2. ∆p = pressure drop due to line friction, psi per 100 ft of
equivalent line length
3. ∆t = corresponding change in saturation temperature,
°F per 100 ft
4. Line capacity for other saturation temperatures ∆ t and
equivalent lengths L
e
5. Saturation temperatures
∆
t for other capacities and
equivalent lengths L
e
Line Capacity = Table Capacity
Table L
e
Actual L
e
Actual ∆ t
Table ∆ t
0.55
R-22 Sizing — Notes
×
∆t = Table ∆t
Actual L
e
Table L
e
Actual Capacity
Table Capacity
1.8
×
Line Capacity = Table Capacity
Table L
e
Actual L
e
Actual ∆ t
Table ∆ t
0.55
R-22 Sizing — Notes
×
∆t = Table ∆t
Actual L
e
Table L
e
Actual Capacity
Table Capacity
1.8
×