Hoshizaki SELF-CONTAINED CRESCENT CUBER KM-250BAF - Manual (Page 15)

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5) Allow the line to drain by gravity.
6) Attach compressed air or carbon dioxide supply to the potable water line drain valve.
7) Move the control switch to the “ICE” position.
8) Blow the potable water line out using compressed air or carbon dioxide.
[3] Drain the potable water tank:
1) Disconnect the power supply.
2) Move the control switch to the “OFF” position.
3) Open the door.
4) Remove the plug at the bottom of the water tank to drain the water tank.
5) Replace the plug in its correct position.
6) Remove all ice from the storage bin, and clean the storage bin.
7) Shut the door.
8) Replace the front panel in its correct position.
9) Close the drain valve.