Based on the textbook, what is the proper charging procedure when retrofitting a critically charged R12 reach-in refrigerator to R401A with an ambient of 80°?
a. Charge R401A until the head pressure reaches 136 psig.
b. Charge R401A until the head pressure reaches 167 psig.
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.
a. Charge R401A until the head pressure reaches 136 psig.
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