Purging The Unit - Samsung Cassette Type Series Installation Manual

Purging the unit

Liquid refrigerant
port
Gas refrigerant port
8
E-
From factory the unit is supplied and set with a pre-charge of nitrogen gas
(insert gas). Therefore, all insert gas must be purged before connecting the
assembly piping.
Unscrew the pinch pipe at the end of each refrigerant pipe.
Result: All inert gas escapes from the indoor unit.
Note To prevent dirt or foreign objects from getting into the pipes
during installation, do NOT remove the pinch pipe completely
until you are ready to connect the piping.