Hoshizaki KM-1340MAH Instruction Manual page 23

[3] Drain the potable water tank:
1) Turn off the power supply.
2) Move the control switch on the control box to the "OFF" position.
3) Remove the insulation panel.
4) Remove the rubber cap covering the overflow pipe in the water tank. Remove the
overflow pipe by turning it counterclockwise. Drain the water tank. See Fig.11.
5) Replace the overflow pipe, the rubber cap and the insulation panel in their correct
positions.
6) Remove all ice from the storage bin, and clean the storage bin.
7) Replace the front panel in its correct position.
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