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Answer :
Final answer:
In a triple evacuation process, a technician pulls a vacuum then charges the system with dry nitrogen to a pressure of 0 psig. This method is utilized in HVAC systems to remove moisture and impurities. After three cycles, the nitrogen is released at 0 psig, ensuring the system is ready for the refrigerant charge.
Explanation:
When performing a triple evacuation, a technician pulls a vacuum and then charges the system with dry nitrogen to a pressure of 0 psig (a). A triple evacuation is a process used in HVAC (Heating, Ventilation, and Air Conditioning) systems which involves pulling a vacuum to remove any contaminants, then charging the system with nitrogen, and repeating this process three times.
The purpose of this process is to remove any moisture from the system, as the moisture can lead to the production of corrosive acids in the system when in contact with refrigerant. The system is initially charged with nitrogen to break the vacuum and to help drive out any moisture that might have been adsorbed by the oil in the system. In the last stage of the evacuation, the nitrogen is released at 0 psig, ensuring the system is in a proper state to receive the refrigerant charge.
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