Pump-Down & Liquid Recovery
A pump-down procedure uses the system's own compressor to move refrigerant from the evaporator into the receiver or condenser, where it is stored as a liquid. This isolates the low side for service without recovering refrigerant to an external cylinder. When external recovery is needed, recovering liquid refrigerant is significantly faster than recovering vapor because liquid is denser and carries more refrigerant per unit volume.
Pump-down uses the system compressor to move refrigerant to the receiver; liquid recovery is faster than vapor recovery.
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