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Question:

When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _____ before switching to liquid charging.

A 35 psig
Explaination

When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least 35 psig before switching to liquid charging.