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Answer :
Final answer:
The liquid charging process of an R-410A refrigeration system should begin from a vacuum level to a pressure of approximately 110 psig to minimize freezing risk.
Explanation:
When charging an R-410A refrigeration system with liquid, it is essential to begin with vapor from a vacuum level to minimize the risk of freezing. The initial pressure should be approximately 110 psig, as option d suggests. Starting the pressurization process at lower pressures may increase the risk of freezing within the system.
Among the options a. 32 psig, b. 63 psig, c. 90 psig, and d. 110 psig for the vacuum level pressure when beginning the liquid charging of an R-410A refrigeration system, the correct answer is d. 110 psig. This practice ensures a better efficiency and safety of the equipment during the operation.
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