Line Sizing
The following Tables 22 through 24A on pages 25 through 30 indicate liquid lines and suction lines for all condensing units for
When determining the refrigerant line length, be sure to add an allowance for fittings. See Table 26 on page 31. Total equivalent length of refrigerant lines is the sum of the actual linear footage and the allowance for fittings.
Table 22. Recommended Line Sizes for R-134a *
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| SUCTION LINE SIZE |
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| SUCTION TEMPERATURE |
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SYSTEM |
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| +40˚F |
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| +30˚F |
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| +20˚F |
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CAPACITY |
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| Equivalent Lengths |
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| Equivalent Lengths |
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| Equivalent Lengths |
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BTU/H | 25' | 50' |
| 75' |
| 100' |
| 150' | 200' | 25' |
| 50' | 75' | 100' | 150' | 200' | 25' | 50' | 75' | 100' | 150' | 200' | ||
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1,000 | 3/8 | 3/8 |
| 3/8 |
| 3/8 |
| 3/8 | 1/2 | 3/8 |
| 3/8 | 3/8 | 3/8 | 1/2 | 1/2 | 3/8 | 1/2 | 1/2 | 1/2 | 1/2 | 5/8 | ||
3,000 | 3/8 | 1/2 |
| 1/2 |
| 1/2 |
| 5/8 | 5/8 | 1/2 |
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| 1/2 | 1/2 | 5/8 | 5/8 | 5/8 | 1/2 | 5/8 | 5/8 | 7/8 | 7/8 | 7/8 | |
4,000 | 1/2 | 1/2 |
| 5/8 |
| 5/8 |
| 5/8 | 5/8 | 1/2 |
| 1/2 | 5/8 | 5/8 | 5/8 | 7/8 | 5/8 | 5/8 | 7/8 | 7/8 | 7/8 | 7/8 | ||
6,000 | 1/2 | 5/8 |
| 5/8 |
| 5/8 |
| 7/8 | 7/8 | 1/2 |
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| 5/8 | 5/8 | 7/8 | 7/8 | 7/8 | 5/8 | 5/8 | 7/8 | 7/8 | 7/8 | 7/8 | |
9,000 | 5/8 | 5/8 |
| 7/8 |
| 7/8 |
| 7/8 | 7/8 | 5/8 |
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| 7/8 | 7/8 | 7/8 | 7/8 | 7/8 | 5/8 | 7/8 | 7/8 | 7/8 | 7/8 | 1 1/8 | |
12,000 | 5/8 | 7/8 |
| 7/8 |
| 7/8 |
| 7/8 | 7/8 | 7/8 |
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| 7/8 | 7/8 | 7/8 | 1 1/8 | 1 1/8 | 7/8 | 7/8 | 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | |
15,000 | 7/8 | 7/8 |
| 7/8 |
| 7/8 |
| 1 1/8 | 1 1/8 | 7/8 |
| 7/8 | 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | 7/8 | 7/8 | 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | ||
18,000 | 7/8 | 7/8 |
| 7/8 |
| 7/8 |
| 1 1/8 | 1 1/8 | 7/8 |
| 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | 1 1/8 | 7/8 | 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | 1 3/8 | ||
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24,000 | 7/8 | 7/8 |
| 1 1/8 |
| 1 1/8 |
| 1 1/8 | 1 1/8 | 7/8 |
| 1 1/8 | 1 1/8 | 1 1/8 | 1 3/8 | 1 3/8 | 7/8 | 1 1/8 | 1 1/8 | 1 1/8 | 1 3/8 | 1 3/8 | ||
30,000 | 7/8 | 1 1/8 |
| 1 1/8 |
| 1 1/8 |
| 1 3/8 | 1 3/8 | 7/8 |
| 1 1/8 | 1 1/8 | 1 3/8 | 1 3/8 | 1 3/8 | 1 1/8 | 1 1/8 | 1 1/8 | 1 3/8 | 1 3/8 | 1 3/8 | ||
36,000 | 7/8 | 1 1/8 |
| 1 1/8 |
| 1 1/8 |
| 1 3/8 | 1 3/8 | 1 1/8 |
| 1 1/8 | 1 3/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 1/8 | 1 1/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | ||
42,000 | 1 1/8 | 1 1/8 |
| 1 1/8 |
| 1 3/8 |
| 1 3/8 | 1 3/8 | 1 1/8 |
| 1 1/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 1/8 | 1 3/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | ||
48,000 | 1 1/8 | 1 1/8 |
| 1 3/8 |
| 1 3/8 |
| 1 3/8 | 1 5/8 | 1 1/8 |
| 1 3/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 1/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 5/8 | 1 5/8 | ||
54,000 | 1 1/8 | 1 1/8 |
| 1 3/8 |
| 1 3/8 |
| 1 5/8 | 1 5/8 | 1 1/8 |
| 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 5/8 | 1 1/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 5/8 | 2 1/8 | ||
60,000 | 1 1/8 | 1 3/8 |
| 1 3/8 |
| 1 3/8 |
| 1 5/8 | 1 5/8 | 1 1/8 |
| 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | 2 1/8 | 1 3/8 | 1 3/8 | 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | ||
66,000 | 1 1/8 | 1 3/8 |
| 1 3/8 |
| 1 5/8 |
| 1 5/8 | 1 5/8 | 1 3/8 |
| 1 3/8 | 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 1 3/8 | 1 5/8 | 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | ||
72,000 | 1 1/8 | 1 3/8 |
| 1 5/8 |
| 1 5/8 |
| 1 5/8 | 2 1/8 | 1 3/8 |
| 1 3/8 | 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 1 3/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 1/8 | ||
78,000 | 1 1/8 | 1 3/8 |
| 1 5/8 |
| 1 5/8 |
| 1 5/8 | 2 1/8 | 1 3/8 |
| 1 5/8 | 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 1 3/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 1/8 | ||
84,000 | 1 3/8 | 1 3/8 |
| 1 5/8 |
| 1 5/8 |
| 2 1/8 | 2 1/8 | 1 3/8 |
| 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 1 3/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 1/8 | ||
90,000 | 1 3/8 | 1 3/8 |
| 1 5/8 |
| 1 5/8 |
| 2 1/8 | 2 1/8 | 1 3/8 |
| 1 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 1 3/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 1/8 | ||
120,000 | 1 3/8 | 1 5/8 |
| 2 1/8 |
| 2 1/8 |
| 2 1/8 | 2 1/8 | 1 5/8 |
| 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 5/8 | 1 5/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | ||
150,000 | 1 5/8 | 2 1/8 |
| 2 1/8 |
| 2 1/8 |
| 2 1/8 | 2 5/8 | 1 5/8 |
| 2 1/8 | 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 | 2 5/8 | ||
180,000 | 1 5/8 | 2 1/8 |
| 2 1/8 |
| 2 1/8 |
| 2 5/8 | 2 5/8 | 1 5/8 |
| 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 | 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 | 3 1/8 | ||
210,000 | 1 5/8 | 2 1/8 |
| 2 1/8 |
| 2 1/8 |
| 2 5/8 | 2 5/8 | 2 1/8 |
| 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 |
| 3 1/8 | 2 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 3 1/8 | 3 1/8 | |
240,000 | 2 1/8 | 2 1/8 |
| 2 1/8 |
| 2 5/8 |
| 2 5/8 | 2 5/8 | 2 1/8 |
| 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 |
| 3 1/8 | 2 1/8 | 2 5/8 | 2 5/8 | 2 5/8 | 3 1/8 | 3 1/8 | |
300,000 | 2 1/8 | 2 1/8 |
| 2 5/8 |
| 2 5/8 |
| 2 5/8 | 3 1/8 | 2 1/8 |
| 2 5/8 | 2 5/8 | 2 5/8 | 3 1/8 | 3 1/8 | 2 1/8 | 2 5/8 | 3 1/8 | 3 1/8 | 3 1/8 | 3 5/8 | ||
360,000 | 2 1/8 | 2 5/8 |
| 2 5/8 |
| 2 5/8 |
| 3 1/8 | 3 1/8 | 2 1/8 |
| 2 5/8 | 2 5/8 | 3 1/8 | 3 1/8 | 3 5/8 | 2 5/8 | 3 1/8 | 3 5/8 | 3 5/8 | 4 1/8 | 4 1/8 | ||
480,000 | 2 5/8 | 2 5/8 |
| 3 1/8 |
| 3 18 |
| 3 1/8 | 3 5/8 | 2 5/8 |
| 3 1/8 | 3 1/8 | 3 1/8 | 3 5/8 |
| 3 5/8 | 3 1/8 | 3 5/8 | 3 5/8 | 4 1/8 | 5 1/8 | 5 1/8 | |
600,000 | 2 5/8 | 3 1/8 |
| 3 1/8 |
| 3 1/8 |
| 3 5/8 | 3 5/8 | 2 5/8 |
| 3 1/8 | 3 1/8 | 3 5/8 | 3 5/8 | 4 1/8 | 3 1/8 | 3 5/8 | 4 1/8 | 4 1/8 | 5 1/8 | 5 1/8 |
*NOTES:
1.Sizes that are highlighted indicate maximum suction line sizes that should be used for risers. Riser size should not exceed horizontal size. Properly placed suction traps must also be used for adequate oil return.
All sizes shown are for O.D. Type L copper tubing.
2.Suction line sizes selected at pressure drop equivalent to 2˚F. Reduce estimate of system capacity accordingly.
3.Recommended liquid line size may increase with reverse cycle hot gas systems.
4.Consult factory for
If system load drops below 40% of design, consideration to installing double suction risers should be made.
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