Evacuation is the act of producing a vacuum, with the elimination of vapors
incondensable inside the cooling system.
The evacuation task needs to be performed to recover a refrigerator unit. Experience has shown that a refrigerator unit does not operate normally if it contains moisture or incondensable gases. Moisture causes clogging in the refrigerant circuit due to freezing at the capillary outlet. Uncondensable gases promote increased pressure in the condenser, making condensation of the refrigerant difficult. Oxygen, in particular, can oxidize 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 done using vacuum pumps.
