Based on the textbook, how should you charge an R12 walk-in refrigerator with TEV when retrofitting to R401A with an ambient of 80°?

a. Charge until the head pressure reaches 136 psig and it has about 10° subcooling.
b. Charge until the head pressure reaches 167 psig and it has about 10° subcooling.
c. Weigh the R12 as it is being removed, then weigh in 80% by weight of R401A.
d. Charge until no more bubbles appear in the sight glass.


b. Charge until the head pressure reaches 167 psig and it has about 10° subcooling.

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