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If a system using a capillary tube or fixed orifice metering device has low superheat, then the system has:

1) a high refrigerant charge
2) a low refrigerant charge
3) a faulty compressor
4) a blocked capillary tube

Answer :

Final answer:

Low superheat in a refrigeration system with a capillary tube usually indicates 1) a high refrigerant charge. Proper refrigerant level is crucial to prevent compressor damage and ensure efficient operation.

Explanation:

Superheat refers to the temperature of the refrigerant vapor above its saturation temperature at a given pressure. Low superheat in a system using a capillary tube or a fixed orifice metering device indicates that the refrigerant has not absorbed enough heat in the evaporator to become superheated vapor. In such cases, one of the common causes is that the system has a high refrigerant charge. This condition can lead to refrigerant flooding back to the compressor, which could result in compressor damage. To address low superheat, the refrigerant charge must be adjusted carefully to ensure the system operates efficiently without risking damage to any components.

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