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www.DaikinApplied.com 45 AG 31-011 • REFRIGERANT PIPING DESIGN
Table 10: R-407C 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) 1 .55 0 .78 0 .39 2 .16 1 .08 0 .54 2 .92 1 .46 0 .73 3 .30 3 .30 3 .30 3 .30 16 .90
OD (in .)
1/2 0.2 0.2 0.1 0.4 0.3 0.2 0.5 0.4 0.3 0.8 0.9 0.9 2.1 3.8 8.9
5/8 0.4 0.3 0.2 0.7 0.5 0.3 1.0 0.7 0.5 1.5 1.6 1.7 3.4 7.1 16.7
7/8 1.2 0.8 0.5 1.8 1.2 0.8 2.7 1.8 1.3 4.1 4.2 4.4 6.9 18.7 43.7
1-1/8 2.3 1.6 1.1 3.6 2.5 1.7 5.4 3.7 2.6 8.2 8.5 8.9 11.8 37.9 88.2
1-3/8 4.1 2.8 1.9 6.3 4.4 3.0 9.5 6.5 4.5 14.2 14.8 15.4 18.0 66.2 153.5
1-5/8 6.4 4.4 3.0 10.0 6.9 4.7 14.9 10.3 7.1 22.5 23.4 24.3 25.5 104.7 241.9
2-1/8 13.4 9.2 6.3 20.7 14.3 9.8 30.9 21.4 14.7 46.5 48.4 50.3 44.4 217.1 499.2
2-5/8 23.6 16.3 11.2 36.6 25.3 17.4 54.5 37.8 26.1 82.0 85.4 88.7 68.5 383.7 879.9
3-1/8 37.8 26.1 17.9 58.3 40.3 27.8 86.9 60.2 41.6 130.5 136.0 141.2 97.7 611.3 1401.5
3-5/8 56.2 38.8 26.7 86.6 60.0 41.4 128.9 89.5 61.8 193.3 201.4 209.2 132.0 907.9 2076.6
4-1/8 79.2 54.7 37.7 122.1 84.6 58.5 181.3 126.1 87.3 272.6 284.0 295.0 171.8 1281.5 2923.4
5-1/8 141.6 97.9 67.6 218.1 151.2 104.7 323.5 225.1 156.1 485.5 505.8 525.3 267.8 2288.8 5209.1
6-1/8 227.9 157.6 109.0 350.4 243.2 168.4 519.6 361.7 251.1 779.0 811.6 843.0 385.0 3676.9 8344.1
ASHRAE Handbook Refrigeration, Chapter 2, 2006.
© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., www.ashrae.org
Values in Table 10 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 1.163 0.787
90 1.099 0.872
100 1.033 0.957
110 0.966 1.036
120 0.896 1.109
130 0.824 1.182
Notes for Table 10 :
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
×