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6/21 57-02611 / 101628 ©2021, Refrigerated Solutions Group™. All rights reserved. 17
Line Sizing
The following tables indicate liquid lines and suction lines for all condensing units for R-404A, R-507,
R-407A/C/F, R-448A and R-449A.
When determining the refrigerant line length, be sure to add an allowance for fittings. See Table 5.
Total equivalent length of refrigerant lines is the sum of the actual linear footage and the allowance for
fittings.
Table 3. Weight of Refrigerants in Copper Lines During Operation (Pounds per 100 lineal feet of type "L" tubing)
Line Size O.D.
(Inches)
Refrigerant Liquid Line Hot Gas Line
Suction Line at Suction Temperature
-40˚F
-20˚F
0˚F
+20˚F
+40˚F
3/8
R-407
3.8
0.25
0.02
0.03
0.04
0.06
0.09
R-448A/R-449A
3.6
0.24
0.02
0.03
0.04
0.06
0.09
R-507, R-404A
3.4
0.31
0.03
0.04
0.06
0.09
0.13
1/2
R-407
7.2
0.46
0.03
0.05
0.08
0.11
0.17
R-448A/R-449A
6.7
0.44
0.03
0.05
0.07
0.11
0.16
R-507, 404A
6.4
0.58
0.04
0.07
0.13
0.16
0.24
5/8
R-407
11.5
0.74
0.05
0.08
0.12
0.18
0.26
R-448A/R-449A
10.8
0.71
0.05
0.08
0.12
0.18
0.26
R-507, 404A
10.3
0.93
0.07
0.11
0.17
0.25
0.35
7/8
R-407
11.5
1.53
0.05
0.08
0.12
0.18
0.26
R-448A/R-449A
22.5
1.48
0.10
0.16
0.25
0.37
0.54
R-507, 404A
21.2
1.92
0.15
0.23
0.37
0.51
0.72
1-1/8
R-407
23.8
2.60
0.10
0.16
0.25
0.37
0.54
R-448A/R-449A
38.4
2.53
0.17
0.27
0.42
0.63
0.92
R-507, 404A
36.1
3.27
0.26
0.39
0.63
0.86
1.24
1-3/8
R-407
40.7
3.96
0.17
0.27
0.43
0.63
0.93
R-448A/R-449A
58.4
3.85
0.25
0.41
0.64
0.96
1.40
R-507, 404A
55.0
4.98
0.40
0.58
0.95
1.32
1.87
1-5/8
R-407
61.8
5.61
0.26
0.41
0.65
1.96
1.43
R-448A/R-449A
82.7
5.45
0.36
0.58
0.90
1.36
1.98
R-507, 404A
78.0
7.07
0.56
0.82
1.35
1.86
2.64
2-1/8
R-407
87.4
9.76
0.36
0.57
0.91
1.38
2.01
R-448A/R-449A
143.8
9.48
0.62
1.01
1.57
2.36
3.44
R-507, 404A
134
12.25
0.98
1.43
2.35
3.23
4.58
2-5/8
R-407
152
15.05
0.63
1.00
1.60
2.38
3.49
R-448A/R-449A
222
14.62
0.96
1.56
2.42
3.65
5.30
R-507, 404A
209
18.92
1.51
2.21
3.62
5.00
7.07
3-1/8
R-407
235
21.48
0.98
1.55
2.46
3.67
5.39
R-448A/R-449A
317
20.86
1.37
2.22
3.45
5.20
7.57
R-507, 404A
298
27.05
2.16
3.15
5.17
7.14
9.95
3-5/8
R-407
345
29.05
1.40
2.23
3.50
5.23
8.27
R-448A/R-449A
428
28.22
1.86
3.01
4.67
7.04
10.24
R-507, 404A
403
36.50
2.92
4.25
6.97
19.65
13.67
4-1/8
R-407
589
37.60
2.45
3.92
6.17
17.80
9.23
R-448A/R-449A
554
36.53
2.40
3.89
6.05
9.11
13.25
R-507, 404A
526
47.57
3.80
5.55
9.09
12.58
17.80
Table 4. Pressure Loss of Liquid Refrigerants in Liquid Line Risers (Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F)
Refrigerant
Liquid Line Rise in Feet
10'
15'
20'
25'
30'
40'
50'
75'
100'
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
PSIG
˚F
R-407
4.3
1.4
6.4
2.0
8.5
2.7
10.6
3.4
12.8
4.1
17.0
5.4
21.3
6.8
31.9
10.1
42.5
13.5
R-448A,
R-449A
4.3
1.1
6.5
1.7
8.7
2.3
10.9
2.8
13.0
3.4
17.4
4.5
21.7
5.6
32.6
8.3
43.5
10.9
R-50,
R-404A
4.1
1.1
6.1
1.6
8.2
2.1
10.2
2.7
12.2
3.3
16.3
4.1
20.4
5.6
30.6
8.3
40.8
11.8
Based on 110˚F liquid temperature at bottom of riser.
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