Answer:
A. Leak test and repair the chiller.
Explanation:
A refrigerant may be defined as a special compound used in the refrigerator or an AC or any other cooling device. It is generally a mixture or a substance used to carry over the heat and release the them to the atmosphere.
It acts as a carrying medium of heat.
A purge unit is a component of the refrigeration system used to remove the air.
When there is a leak in the refrigeration system, refrigerant escapes and it results in cooling loss.
Thus in order to reduce the refrigerant loss from the unit, we have to do a leak test to check for any leaks and then repair the chiller unit.