Based on the textbook, what is the proper charging procedure when retrofitting a critically charged R12 reach-in refrigerator to any alternate HCFC refrigerant?
a. Charge until the head pressure is correct for the replacement refrigerant.
b. Charge until the head pressure is correct for R12 refrigerant.
c. Weigh in the refrigerant to the amount indicated on the rating plate.
d. Weigh in 80% of the amount indicated on the rating plate.
b. Charge until the head pressure is correct for R12 refrigerant.
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