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Control Pressurestat for Booster Applica- tion — The standard dual pressure switch furnished with the 5F,H compressor cannot be used for booster application. Replace it with an appropriate low temperature dual pressurestat that can operate at values shown in Table 24. Any commercial pressure switch is acceptable; for example, an
Table 24 — Control Pressurestats for
Low Stage Application
CHARACTERISTICS |
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Switch Action — High | Open on pressure rise | Open on pressure rise | |||
| — Low | Open on pressure fall | Open on pressure fall | ||
Range | — High | 20″ | Vac to 65 psig | 30″ | Vac to 110 psig |
| — Low | 30″ | Vac to 20 psig | 30″ | Vac to 25 psig |
Differential | — High | 8 to 30 psi adjust. | 12 to 30 psi adjust. | ||
| — Low | 5 to 15 psi adjust. | 9 to 30 psi adjust. | ||
Max Pressure — High | 200 psig | 300 psig | |||
| — Low | 120 psig | 300 psig |
F | +50 |
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TEMPERATURE |
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| 120 |
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+40 |
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| F | 110 |
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| TEMPERATURE |
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+30 |
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| 100 |
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| 90 |
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INTERMEDIATE |
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| DISCHARGE |
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+20 |
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| 80 |
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+10 |
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| SATURATED |
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SATURATED | 0 |
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| SATURATED SUCTION TEMPERATURE F |
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| +50 |
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F | +40 |
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TEMPERATURE |
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| 110 |
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+30 |
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| F |
| 100 |
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| TEMPERATURE |
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| 90 |
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+20 |
| 80 |
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INTERMEDIATE | +10 |
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| DISCHARGE |
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| SATURATED |
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0 |
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SATURATED |
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| 0 | ||||||||||
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| SATURATED SUCTION TEMPERATURE F |
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NOTE: For
Fig. 21 — Optimum Intermediate Temperature for 2-Stage Compression
(Incorporating Equal Compression Ratios per Stage)
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