The system includes a first heat exchanger in which the refrigerant is injected directly into the content of the first liquid circuit through at least one nozzle to simultaneously capture latent heat from the content as purified frozen liquid pieces are formed. A control section accepts a selective input of a channel number from a user through a key operation section and reads out information corresponding to the accepted channel number from the EEPROM. A restrictor is provided for engaging the portion of the pressure source passing through the restrictor housing and is adjustable to variably alter fluid flow through the pressure source portion. The housing can also include a deformable member disposed within the inner lumen and having an opening formed therein for slidably receiving at least a portion of the elongate member such that the elongate member can be angularly oriented relative to a longitudinal axis of the lumen. The second engaging member is disposed on the second side of the base in an elastically deformable manner. The second connector includes a second contact terminal and a slide lever.