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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. 0 psig

B. 20 psig

C. 35 psig

D. 100 psig

Answer :

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 a) 0 psig , before switching to liquid charging.

Charging the system with vapor initially allows for a more efficient transfer of heat in the condenser. By introducing the refrigerant as a vapor, it can absorb heat from the surrounding environment and condense into a liquid. This process maximizes the cooling effect and ensures effective heat transfer in the system.

Once the system is initially charged with vapor and the pressure reaches 0 psig, you can then switch to liquid charging. Liquid charging involves introducing the refrigerant into the system in its liquid state, allowing for a more controlled and precise amount of refrigerant to enter the system.

By following this step-by-step procedure and charging the R-12 refrigeration system with vapor to a pressure of at least 0 psig before switching to liquid charging, you can optimize the system's performance and ensure efficient cooling.

Therefore, the correct answer is a) 0 psig

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