A Multiple Evacuation Means That ____

Multiple Choice

A multiple evacuation means that ____.

A) you connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum
B) you pull a vacuum on three different systems at the same time
C) you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure
D) there must be more than one system operating before a vacuum can be pulled