Evacuation is the act of
producing a vacuum, with the elimination of incontensible vapors from inside
the refrigeration system. Dehydration is the act of dehydrating, that is,
removing moisture from inside the cooling system. The evacuation and
dehydration task is one of the most important tasks that the refrigeration
mechanic needs to perform in order to recover a refrigerator unit. Experience
shows that the refrigeration unit does not operate normally if it contains
moisture or incondensable gases. Moisture causes clogging in the refrigeration
circuit due to “freezing” at the outlet of the expansion device. Uncondensable
gases promote increased pressure in the condenser, making condensation of the
refrigerant difficult. Oxygen, in particular, can oxidize the oil where the
temperature is highest. It is therefore necessary to evacuate and dehydrate the
refrigeration system simultaneously, before charging the refrigerant.
Evacuation and dehydration are carried out by means of vacuum pumps, always
following the manufacturer's guidance at the appropriate “vacuum” level.
PERFORM EVACUATION AND DEHYDRATION OF THE AIR CONDITIONER SYSTEM
