Samsung AR12TVEAAWKNAP Service Manual page 90

12-6-2 "Pump down" Procedure
Pump down will be carried out when an evaporator is replaced or when the unit is relocated in another area.
1) Remove the caps from the 3 way valve and the
3 way valve.
2) Turn the 3 way valve clockwise to close and
connect a pressure gauge (low pressure side)
to the service valve, and open the 3 way valve
again.
3) Set the unit to cool operation mode.
(Check if the compressor is operating.)
4) Turn the 3 way valve clockwise to close.
5) When the pressure gauge indicates "0" turn the
3 way valve clockwise to close.
6) Stop operation of the air conditioner.
7) Close the cap of each valve.
Relocation of the air conditioner
entering.
At this time, cover the valve of the outdoor unit and the other pipe using a cap or vinyl plug to avoid foreign
material entering.
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3 way Valve
2 way Valve