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Answer :
Final answer:
For charging an R-12 refrigeration system with a water-cooled condenser, start with a vapor charge to at least 30 psig before switching to liquid charging.
Explanation:
When charging an R-12 refrigeration system with a water-cooled condenser, it's crucial to begin the process by charging with vapor to a certain pressure level before switching to liquid charging. This initial step ensures that the refrigerant is evenly distributed and prevents liquid refrigerant from entering the compressor, which could cause damage. The answer to the question is d. 30 psig, meaning you must first charge the system with vapor to a pressure of at least 30 psig before continuing with liquid charging. This initial vapor charging helps to avoid the risk of slugging the compressor with liquid.
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