Samsung DIGIMAX A6 Owner's Instructions Manual page 36

Five metres(16ft 5in) of piping is supplied with the air
conditioner(Optional). This length can if necessary be:
N Extended to a maximum of "L" m/ft.
N Shortened as required
☛
If more than 5m(16ft 5in) of piping is required:
N The assembly cable must also be extended
N Refrigerant must be added to the circuit by an
approved installer; otherwise, the indoor unit may
freeze