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Remote Condensing Unit Installation Instructions
©2019 Tecumseh Compressor Company LLC. All rights reserved. TPC Part #71511 | Rev A 05/13/2019www.tecumseh.com
Line Sizing
The following Tables 5 and 6 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 3.
Total equivalent length of refrigerant lines is the sum of the actual linear footage and the allowance for fittings.
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, R-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, R-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, R-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, R-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, R-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, R-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 0.91 138 2.01
R-448A/R-449A 143.8 9.48 0.62 1.01 1.57 2.36 3.44
R-507, R-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, R-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, R-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 4.00 5.23 8.27
R-448A/R-449A 428 28.22 1.86 3.01 4.67 7.04 10.24
R-507, R-407A 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 9.00 13.25
R-507, R-404A 526 47.57 3.80 5.55 9.09 12.58 17.80
TABLE 1 – Weight of Refrigerants in Copper Lines During Operation
(Pounds per 100 lineal feet of type “L” tubing)
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