PUMP OIL |
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PRESSURE |
| 3 | 1 | ||
4 | 2 | ||||
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| SEE FIG. 13 |
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| UNLOADER PUMP | |
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| TO CRANKCASE | |
3/8 NPT |
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| (CONNECTION ON | |
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| PUMP END COVER) | ||
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| SEE FIG. 15 | |
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| 1/4 NPT |
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| 3 |
| 1 |
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| 4 | 2 |
| OIL TO UNLOADER | |
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| 1/4 NPT (FOUR PLACES) | |||
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*STEP #2 IS OMITTED ON 5H40 COMPRESSOR | PUMP END BEARING HEAD |
Fig. 14 — 5H40, 46, 60, 66, 80, 86 Bearing Head
TO DUMP CONTROL OIL BACK INTO OIL RESERVOIR USE EITHER CONNECTION
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Fig. 15 — 5H40, 46, 60, 66, 80, 86
Pump End Cover Assembly
CAPACITY CONTROL MODIFICATIONS FOR HEAT PUMP APPLICATION — Where 5F40, 5F60, and 5H com- pressors are used in refrigerant cycle reversing heat pump applications, it is usually necessary to modify the standard capacity control arrangement to satisfy unloading require- ments. On summer cycle, the compressor is required to unload as circulating water or air temperature drops. During winter cycle, the control works in reverse, so that the compressor unloads as the circulating water or air temperature increases. It is necessary for the compressor to unload in response to either a summer or winter
Where summer and winter design suction temperatures are within design range of either electric or pneumatic compensa- tion devices, capacity control may be external. However, another means is normally required.
Usually modification to the compressor capacity control system is required. The compressor can be modified in 2 ways:
(1)for applications requiring 50% capacity reduction; (2) for applications requiring more than one step of capacity reduc- tion. See Fig. 10 for a typical
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