1-7. Straight Equivalent Length of Joints
Design the tubing system by referring to the following table for the straight equivalent length of joints.
Table |
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Gas tubing size (in. (mm)) | 1/2" | 5/8" |
| 3/4" | 7/8" | 1" | ||||||
(12.7) | (15.88) |
| (19.05) | (22.22) | (25.4) | (28.58) | (31.8) | (38.1) | ||||
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90° elbow |
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| 1 | 1.1 |
| 1.4 | 1.6 | 1.7 | 1.9 | 2.3 | 2.6 |
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45° elbow | 0.8 | 0.9 |
| 1 | 1.2 | 1.3 | 1.4 | 1.7 | 1.9 | |||
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3 | 3.4 |
| 4.1 | 4.7 | 5.1 | 5.6 | 6.9 | 7.8 | ||||
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Trap bend | 7.5 | 9.2 |
| 10.5 | 12.5 | 14.1 | 15.4 | 16.4 | 14.0 | |||
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| Equivalent length conversion not needed. |
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Ball valve for service |
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| Equivalent length conversion not needed. |
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Table
Tubing size (in. (mm))
Material O | Material 1/2H • H | ||
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ø1/4" (ø6.35) | t1/32" (0.8) | ø7/8" (ø22.22) | t5/128" (1.0) |
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ø3/8" (ø9.52) | t1/32" (0.8) | ø1" (ø25.40) | t5/128" (1.0) |
ø1/2" (ø12.7) | t1/32" (0.8) | t5/128" (1.0) | |
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ø5/8" (ø15.88) | t5/128" (1.0) | t3/64" (1.1) | |
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ø3/4" (ø19.05) | over t5/128" (1.0) | over t3/64" (1.15) | |
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| over t3/64" (1.20) | |
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*When bending the tubes, use a bending radius that is at least 4 times the outer diameter of the tubes.
In addition, take sufficient care to avoid crushing or damaging the tubes when bending them.
Additional refrigerant charge amount is calculated from the liquid tubing total length as follows.
Table
Liquid tubing size | Amount of refrigerant |
(in. (mm)) | charge (oz/ft.) |
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ø1/4" (ø6.35) | 0.279 |
ø3/8" (ø9.52) | 0.602 |
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ø1/2" (ø12.7) | 1.38 |
ø5/8" (ø15.88) | 1.99 |
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ø3/4" (ø19.05) | 2.78 |
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ø7/8" (ø22.22) | 3.93 |
Required amount of charge = (Amount of refrigerant charge per meter of each size of liquid tube ⋅ its tube length) + (...) + (...)
*Always charge accurately using a scale for weighing.
*If the existing tubing is used, and the amount of
refrigerant charge exceeds the value listed below, then change the size of the tubing to reduce the amount of refrigerant.
Max. additional charge for 1 outdoor unit :62 lbs Max. additional charge for 2 outdoor units :111 lbs Max. additional charge for 3 outdoor units :133 lbs
Table
DC
(oz)
CHDX09053 | CHDX14053 |
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423 | 458 |
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Table
Max. No. allowable connected outdoor units | 2 *1 |
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Max. capacity allowable connected outdoor units | 307,100 BTU/h (32 hp, 90 kW) |
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Max. connectable indoor units | 40 |
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Max. allowable indoor/outdoor capacity ratio | 50 – 130 % |
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*1: Up to 2 units can be connected if the system has been extended.
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