Sizing Refrigerant Lines. To determine field installed liquid and discharge line sizes, first establish the equivalent length of pipe for each line, valve, and elbow. Chiller capacity and leaving water temperature range is also required. See Figure 4 on page 21 for lengths of refrigerant valves and fittings.
Liquid Line Sizing. The liquid line should be sized as small as possible while maintaining acceptable pressure drop to minimize the refrigerant charge. Liquid line risers must not exceed 15 feet from the base of the
Discharge Line Sizing. Discharge line sizing is based on the velocity required for sufficient oil return back to the compressor. See Figure 4: Equivalent Length in Feet for Valves and Fittingson page 24 for discharge line sizing.
| Note: | For horizontal runs, the discharge line should be pitched downward, in the | ||||
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| direction of flow, at a rate of 1/2” for every 10 feet. This will allow oil to flow | |||
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| towards the condenser. | |||
Figure 4: Equivalent Length in Feet for Valves and Fittings | ||||||
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Line Size |
| Angle |
| Short | Long | |
OD (inches) |
| Valve |
| Radius EL | Radius EL | |
3/8 |
| 24 |
| 4 | 2.8 |
|
1/2 |
| 24 |
| 4.7 | 3.2 |
|
5/8 |
| 25 |
| 5.7 | 3.9 |
|
3/4 |
| 25 |
| 6.5 | 4.5 |
|
7/8 |
| 28 |
| 7.8 | 5.3 |
|
| 29 |
| 2.7 | 1.9 |
| |
| 33 |
| 3.2 | 2.2 |
| |
| 34 |
| 3.8 | 2.6 |
| |
| 39 |
| 5.2 | 3.4 |
| |
| 44 |
| 6.5 | 4.2 |
| |
Figure 5: Liquid Line Sizing
GPRC-20
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| Liquid Line Size (OD") |
| |
Total Equiv. | Horizontal |
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or | Upflow | Upflow | Upflow | |
Length (Ft) | Downflow | |||
25 | 1/2 | 1/2 | 1/2 | 1/2 |
50 | 1/2 | 1/2 | 1/2 | 1/2 |
75 | 1/2 | 1/2 | 1/2 | 1/2 |
100 | 1/2 | 1/2 | 1/2 | 5/8 |
125 | 1/2 | 1/2 | 1/2 | 5/8 |
150 | 1/2 | 1/2 | 5/8 | 5/8 |
175 | 1/2 | 5/8 | 5/8 | 5/8 |
200 | 1/2 | 5/8 | 5/8 | 5/8 |
225 | 1/2 | 5/8 | 5/8 | 5/8 |
250 | 5/8 | 5/8 | 5/8 | 5/8 |
275 | 5/8 | 5/8 | 5/8 | 5/8 |
300 | 5/8 | 5/8 | 5/8 | 5/8 |
GPRC-30
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| Liquid Line Size (OD") |
| |
Total Equiv. | Horizontal |
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or | Upflow | Upflow | Upflow | |
Length (Ft) | Downflow | |||
25 | 5/8 | 5/8 | 5/8 | 5/8 |
50 | 5/8 | 5/8 | 5/8 | 5/8 |
75 | 5/8 | 5/8 | 5/8 | 5/8 |
100 | 5/8 | 5/8 | 5/8 | 5/8 |
125 | 5/8 | 5/8 | 5/8 | 5/8 |
150 | 5/8 | 5/8 | 5/8 | 5/8 |
175 | 5/8 | 5/8 | 5/8 | 3/4 |
200 | 5/8 | 5/8 | 5/8 | 3/4 |
225 | 5/8 | 5/8 | 5/8 | 3/4 |
250 | 5/8 | 5/8 | 3/4 | 3/4 |
275 | 5/8 | 5/8 | 3/4 | 3/4 |
300 | 5/8 | 5/8 | 3/4 | 3/4 |
GP Series Portable Chillers | Chapter 3: Installation | 21 of 90 |
