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Answer :
Final answer:
When charging an R-410A system with a water-cooled condenser, the initial charging pressure with vapor should be at least 220 psig before switching to liquid charging.
Explanation:
When charging an R-410A system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least 220 psig, before switching to liquid charging. This is because R-410A is a blend of two refrigerants, and when charging with vapor, it helps to ensure both refrigerants are evenly mixed throughout the system. Charging with vapor also prevents condensation from occurring prematurely on the heat exchanger surfaces. Therefore, the correct answer is c) 220 psig.
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