| 摘要 |
In a refrigeration system, an apparatus and method for providing low refrigerant charge detection before and during compressor operation. For detection before compressor operation, a very low refrigerant charge condition is indicated if the measured refrigerant pressure at the inlet of the compressor is too low based on a comparison of the measured pressure and a reference pressure related to the saturation pressure at the measured ambient temperature. If a low refrigerant charge condition is detected, the compressor may be inhibited from operating. If the system is stable with compressor non-operation, a warning also occurs. While the compressor is operating, a moderately low refrigerant charge condition is detected if the measured refrigerant temperature at the inlet of the compressor is too high based on a comparison of the measured temperature and a reference temperature related to the saturation temperature of the refrigerant for the measured refrigerant pressure. If a moderately low refrigerant charge condition is detected, two levels of warning can occur, for servicing and for indicating a severe condition so compressor operation may be disabled, depending on the discrepancy.
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