Samsung ACC2400C Owner's Instructions & Installation Manual page 49

The outdoor units is loaded with sufficient R-22 refrigerant for 5 m(16 ft) of
piping. The air in the indoor unit and in the pipe must be purged. If air
remains in the refrigeration pipes, it will affect the compressor, reduce to
cooling capacity and could lead to a malfunction. Refrigerant for air purging
is not charged in the outdoor unit. Use Vacuum Pump as shown at the figure.
Adding Refrigerant
Refrigerant must be added if the piping measures more than 5 m(16 ft) in
length (maximum of "A" m/ft). The quantity of additional refrigerant is
variable according to the installation situation. Thus, make sure the outdoor
unit situation before adding refrigerant. This operation can only be performed
by a qualified refrigeration specialist.
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