You have completed repairs to a small galley refrigerator which uses a capillary tube and a hermetic compressor. The repairs required complete evacuation of the refrigerant and you find that you do not have a proper scale to weighing the amount of refrigerant you will recharge into the system. As the unit is critical to galley operations you must try and restore it to service. The most prudent course of action would be to do which of the following?
• Capillary tube systems and why they are very sensitive to refrigerant charge level • Risks of liquid refrigerant slugging a hermetic compressor during start‑up • Safe ways to approach correct charge when you cannot weigh refrigerant
• Which choices involve deliberately overcharging the system, and what problems can that cause in a small capillary‑tube refrigerator? • Which option focuses on gradually approaching normal operating conditions while observing pressures/temperatures, instead of forcing a condition and then backing off? • How would you protect the compressor from liquid floodback right after a full evacuation and repair?
• Eliminate any options that risk flooding the suction side with liquid refrigerant or obviously overcharging the system • Consider that adding extra oil changes system balance and is not a standard method for controlling refrigerant flow • Ask which option best matches standard service practice: start with a conservative (safe) charge and carefully monitor system behavior.
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